Armstrong World Industries (AWI) 10-K21 Feb 232022 FY Annual reportFinancial data

Company Profile

Document And Entity Information

Document And Entity Information - USD ($) $ in Billions	12 Months Ended
Document And Entity Information - USD ($) $ in Billions	Dec. 31, 2022	Feb. 15, 2023	Jun. 30, 2022
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2022
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Entity Registrant Name	ARMSTRONG WORLD INDUSTRIES, INC.
Trading Symbol	AWI
Entity Central Index Key	0000007431
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Shell Company	false
Entity File Number	1-2116
Entity Tax Identification Number	23-0366390
Entity Address, Address Line One	2500 Columbia Avenue
Entity Address, City or Town	Lancaster
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	17603
City Area Code	717
Local Phone Number	397-0611
Entity Emerging Growth Company	false
Entity Small Business	false
Document Annual Report	true
Title of 12(b) Security	Common Stock, $0.01 par value per share
Security Exchange Name	NYSE
Entity Incorporation, State or Country Code	PA
Document Transition Report	false
ICFR Auditor Attestation Flag	true
Entity Interactive Data Current	Yes
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Common Stock, Shares Outstanding		45,438,268
Entity Public Float			$ 3.4
Documents Incorporated by Reference	Documents Incorporated by Reference Certain sections of Armstrong World Industries, Inc.’s definitive Proxy Statement for use in connection with its 2023 annual meeting of shareholders, to be filed no later than May 1, 2023 (120 days after the last day of our 2022 fiscal year), are incorporated by reference into Part III of this Form 10-K Report where indicated.
Auditor Name	KPMG LLP
Auditor Location	Philadelphia, PA
Auditor Firm ID	185

Consolidated Statements of Oper

Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Net sales	$ 1,233.1	$ 1,106.6	$ 936.9
Cost of goods sold	784	701	603.8
Gross profit	449.1	405.6	333.1
Selling, general and administrative expenses	237	237.4	163.2
Loss (gain) related to change in fair value of contingent consideration	11	(4.1)	0.1
(Gain) related to sale of fixed and intangible assets	0	0	(21)
Equity (earnings) from joint venture	(77.6)	(87.7)	(64)
Operating income	278.7	260	254.8
Interest expense	27.1	22.9	24.1
Other non-operating (income) expense, net	(6)	(5.6)	357.4
Earnings (loss) from continuing operations before income taxes	257.6	242.7	(126.7)
Income tax expense (benefit)	57.7	57.4	(42.6)
Earnings (loss) from continuing operations	199.9	185.3	(84.1)
Gain (loss) from disposal of discontinued businesses, net of tax (benefit) expense of ($3.0), $1.7 and ($1.4)	3	(2.1)	(15)
Net earnings (loss) from discontinued operations	3	(2.1)	(15)
Net earnings (loss)	202.9	183.2	(99.1)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(1.8)	0	(7.1)
Derivative gain (loss), net	18.6	9.9	(10.5)
Pension and postretirement adjustments, after-tax amount	(7.3)	(10.2)	284.4
Total other comprehensive income (loss)	9.5	(0.3)	266.8
Total comprehensive income	$ 212.4	$ 182.9	$ 167.7
Earnings (loss) per share of common stock, continuing operations:
Basic	$ 4.31	$ 3.88	$ (1.76)
Diluted	4.30	3.86	(1.76)
Earnings (loss) per share of common stock, discontinued operations
Basic	0.07	(0.04)	(0.31)
Diluted	0.07	(0.04)	(0.31)
Net earnings (loss) per share of common stock
Basic	4.38	3.84	(2.07)
Diluted	$ 4.37	$ 3.82	$ (2.07)
Average number of common shares outstanding:
Basic	46.3	47.6	47.9
Diluted	46.4	47.9	47.9

Consolidated Statements of Op_2

Consolidated Statements of Operations and Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Income tax (benefit) expense	$ (3)	$ 1.7	$ (1.4)

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 106	$ 98.1
Accounts and notes receivable, net	112.4	109.1
Inventories, net	110	90.2
Income taxes receivable	1.8	1.4
Other current assets	26.3	23.1
Total current assets	356.5	321.9
Property, plant, and equipment, net	554.4	542.8
Operating lease assets	18.8	21
Finance lease assets	16	18.4
Prepaid pension costs	83.2	109
Investment in joint venture	23.9	50
Goodwill	167.3	167
Intangible assets, net	407.7	421.4
Income taxes receivable	0	0.6
Other non-current assets	59.4	57.9
Total assets	1,687.2	1,710
Current liabilities:
Current installments of long-term debt	0	25
Accounts payable and accrued expenses	172.5	174.9
Operating lease liabilities	5.9	5.6
Finance lease liabilities	2.2	2.2
Income taxes payable	2.1	1.9
Total current liabilities	182.7	209.6
Long-term debt, less current installments	651.1	606.4
Operating lease liabilities	13.2	15.6
Finance lease liabilities	14.6	16.8
Postretirement benefit liabilities	54.8	71.1
Pension benefit liabilities	27.6	36.9
Other long-term liabilities	25.8	46.7
Income taxes payable	13.1	20.3
Deferred income taxes	169.3	166.9
Total non-current liabilities	969.5	980.7
Shareholders' equity:
Common stock, $0.01 par value per share, 200 million shares authorized, 62,936,820 shares issued and 45,572,185 shares outstanding as of December 31, 2022 and 62,775,155 shares issued and 47,302,299 shares outstanding as of December 31, 2021	0.6	0.6
Capital in excess of par value	573.6	561.3
Retained earnings	1,169.9	1,011.4
Treasury stock, at cost, 17,364,635 shares as of December 31, 2022 and 15,472,856 shares as of December 31, 2021	(1,109)	(944)
Accumulated other comprehensive (loss)	(100.1)	(109.6)
Total shareholders' equity	535	519.7
Total liabilities and shareholders' equity	$ 1,687.2	$ 1,710

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	62,936,820	62,775,155
Common stock, shares outstanding	45,572,185	47,302,299
Treasury stock, shares	17,364,635	15,472,856

Consolidated Statements of Shar

Consolidated Statements of Shareholders' Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock	AOCI Attributable to Parent
Beginning Balance at Dec. 31, 2019	$ 364.9	$ 0.6	$ 555.7	$ 1,008.2	$ (823.5)	$ (376.1)
Balance, shares at Dec. 31, 2019		47,992,348
Balance, shares at Dec. 31, 2019					14,271,047
Stock issuance, net, shares		335,936
Cash dividends - per common share	(39.3)			(39.3)
Share-based employee compensation	2		2
Net earnings (loss)	(99.1)			(99.1)
Other comprehensive income (loss)	266.8					266.8
Restricted stock issued to employees in connection with acquisition			(4)		$ 4
Restricted stock issued to employees in connection with acquisition, shares		94,230			(94,230)
Acquisition of treasury stock	(44.4)				$ (44.4)
Acquisition of treasury stock, shares		(508,693)			508,693
Ending Balance at Dec. 31, 2020	450.9	$ 0.6	553.7	869.8	$ (863.9)	(109.3)
Balance, shares at Dec. 31, 2020		47,913,821
Balance, shares at Dec. 31, 2020					14,685,510
Stock issuance, net			0.1		$ (0.1)
Stock issuance, net, shares		173,379			2,445
Cash dividends - per common share	(41.6)			(41.6)
Share-based employee compensation	7.5		7.5
Net earnings (loss)	183.2			183.2
Other comprehensive income (loss)	(0.3)					(0.3)
Acquisition of treasury stock	(80)				$ (80)
Acquisition of treasury stock, shares		(784,901)			784,901
Ending Balance at Dec. 31, 2021	$ 519.7	$ 0.6	561.3	1,011.4	$ (944)	(109.6)
Balance, shares at Dec. 31, 2021	47,302,299	47,302,299
Balance, shares at Dec. 31, 2021					15,472,856
Stock issuance, net, shares		159,628			2,037
Cash dividends - per common share	$ (44.4)			(44.4)
Share-based employee compensation	12.3		12.3
Net earnings (loss)	202.9			202.9
Other comprehensive income (loss)	9.5					9.5
Acquisition of treasury stock	(165)				$ (165)
Acquisition of treasury stock, shares		(1,889,742)			1,889,742
Ending Balance at Dec. 31, 2022	$ 535	$ 0.6	$ 573.6	$ 1,169.9	$ (1,109)	$ (100.1)
Balance, shares at Dec. 31, 2022	45,572,185	45,572,185
Balance, shares at Dec. 31, 2022					17,364,635

Consolidated Statements of Sh_2

Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares	1 Months Ended	12 Months Ended
	Oct. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Stockholders' Equity [Abstract]
Dividends declared	$ 0.254	$ 0.947	$ 0.861	$ 0.810

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net earnings (loss)	$ 202.9	$ 183.2	$ (99.1)
Adjustments to reconcile net earnings (loss) to net cash provided by operating activities:
Depreciation and amortization	83.7	96.5	84
Write-off of debt refinancing fees	0.6	0	0
Loss on disposal of discontinued operations	0	0.4	16.4
Gain related to sale of fixed and intangible assets	0	0	(21)
Deferred income taxes	(1.6)	8.7	(89.3)
Share-based compensation	14.3	11.3	6.8
Equity (earnings) from joint venture	(77.6)	(87.7)	(64)
U.S. pension (credit) cost	(0.7)	0.1	367.7
Loss (gain) from change in fair value of contingent consideration	11	(4.1)	0.1
Payments of contingent consideration in excess of acquisition date fair value	(1.9)	0	0
Other non-cash adjustments, net	1	0.9	0.9
Changes in operating assets and liabilities:
Receivables	(12.4)	(30.9)	12.7
Inventories	(19.7)	(10.6)	(7.7)
Accounts payable and accrued expenses	(1.8)	38.6	(11.9)
Income taxes receivable and payable, net	(6.9)	(2)	35.2
Other assets and liabilities	(8.5)	(17.2)	(12)
Net cash provided by operating activities	182.4	187.2	218.8
Cash flows from investing activities:
Purchases of property, plant and equipment	(74.8)	(79.8)	(55.4)
Return of investment from joint venture	104.5	78.3	81.5
Cash paid for acquisitions, net of cash acquired	(2.8)	(0.7)	(164.6)
Proceeds from the sale of assets	0	0.1	21.7
Payments of proceeds from Knauf to investment in joint venture	0	0	(25.9)
Payments to Knauf upon disposal of discontinued operations	0	(11.8)	(6.4)
Proceeds from company-owned life insurance, net	1.3	0	8
Net cash provided by (used for) investing activities	28.2	(13.9)	(141.1)
Cash flows from financing activities:
Proceeds from short-term debt	0	0	30
Payments of short-term debt	0	0	(30)
Proceeds from revolving credit facility	355	95	290
Payments of revolving credit facility	(315)	(155)	(180)
Proceeds from long-term debt	450	0	0
Payments of long-term debt	(468.7)	(25)	(6.3)
Financing costs	(3.1)	0	0
Dividends paid	(44.2)	(41.4)	(39.2)
Payments from share-based compensation plans, net of tax	(2)	(3.6)	(4.8)
Payments for finance leases	(2.2)	(2.1)	(1.8)
Payments of acquisition related contingent consideration	(6.7)	0	0
Payments for treasury stock acquired	(165)	(80)	(44.4)
Net cash (used for) provided by financing activities	(201.9)	(212.1)	13.5
Effect of exchange rate changes on cash and cash equivalents	(0.8)	0	0.4
Net increase (decrease) in cash and cash equivalents	7.9	(38.8)	91.6
Cash and cash equivalents at beginning of year	98.1	136.9	45.3
Cash and cash equivalents at end of year	106	98.1	136.9
Supplemental Cash Flow Disclosures:
Interest paid	26.9	21.5	24.1
Income tax payments, net	63.2	52.5	10.9
Amounts in accounts payable for capital expenditures	$ 2.8	$ 0.3	$ 1

Business

Business	12 Months Ended
Business	Dec. 31, 2022
Business [Abstract]
Business	NOTE 1. BUSINESS Armstrong World Industries, Inc. (“AWI”) is a Pennsylvania corporation incorporated in 1891. When we refer to “AWI,” the “Company,” “we,” “our” and “us” in these notes, we are referring to AWI and its subsidiaries. Acquisitions In November 2022, we acquired the business and assets of GC Products, Inc. (“GC Products”), based in Lincoln, CA. GC Products is a designer and manufacturer of glass-reinforced-gypsum, glass-reinforced-cement, molded ceiling and specialty wall products with one manufacturing facility. In December 2020, we acquired all of the issued and outstanding equity of Arktura LLC (“Arktura”) and certain subsidiaries with operations in the United States and Argentina. Arktura is a designer and fabricator of metal and felt ceilings, walls, partitions and facades with one manufacturing facility based in Los Angeles, California. In August 2020, we acquired the business and assets of Moz Designs, Inc. (“Moz”), based in Oakland, California. Moz is a designer and fabricator of custom architectural metal ceilings, walls, dividers and column covers for interior and exterior applications with one manufacturing facility. In July 2020, we acquired all of the issued and outstanding capital stock of TURF Design, Inc. (“Turf”), with one manufacturing facility in Elgin, Illinois and a design center in Chicago, Illinois. Turf is a designer and manufacturer of acoustic felt ceilings and wall products. The operations, assets and liabilities of these acquisitions are included in our Architectural Specialties segment. See Note 5 for further information on our acquisitions. COVID-19 Considerations The impact of the COVID-19 pandemic on our future consolidated results of operations is uncertain. The extent to which COVID-19 impacts our employees, operations, customers, suppliers and financial results depends on numerous evolving factors that we may not be able to accurately predict, including: the duration and scope of the pandemic (and whether there is a resurgence or multiple resurgences in the future, including the impact of new variants); government actions taken in response to the pandemic, including required shutdowns; the availability, acceptance, distribution and continued effectiveness of vaccines; the impact on construction activity; supply chain disruptions; rising inflation; labor shortages; sustained remote or hybrid work models; our ability to manufacture and sell our products; and the ability of our customers to pay for our products. We did not record any asset impairments, inventory charges or material bad debt reserves related to COVID-19 during 2022, 2021 or 2020, but future events may require such charges, which could have a material adverse effect on our financial condition, liquidity or results of operations.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
Summary of Significant Accounting Policies	Dec. 31, 2022
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	NOTE 2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Consolidation Policy . The consolidated financial statements and accompanying data in this report include the accounts of AWI and its majority-owned subsidiaries. All significant intercompany transactions have been eliminated from the consolidated financial statements. Use of Estimates . We prepare our financial statements in conformity with U.S. Generally Accepted Accounting Principles (“U.S. GAAP”), which requires management to make estimates and assumptions. These estimates and assumptions affect the reported amounts of assets, liabilities, revenues and expenses. When preparing an estimate, management determines the amount based upon the consideration of relevant internal and external information. Actual results may differ from these estimates. Revenue Recognition . We recognize revenue upon transfer of control of our products to the customer, which typically occurs upon shipment. Our main performance obligation to our customers is the delivery of products in accordance with purchase orders. Each purchase order confirms the transaction price for the products purchased under the arrangement. Direct sales to building materials distributors, home centers, direct customers and retailers represent the majority of our sales. Our standard sales terms are Free On Board (“FOB”) shipping point. We have some sales terms that are FOB destination. At the point of shipment, the customer is required to pay under normal sales terms. In most cases our normal payment terms are 45 days or less and our sales arrangements do not have any material financing components. In addition, our customer arrangements do not produce contract assets or liabilities that are material to our Consolidated Financial Statements. Within our Architectural Specialties segment, the majority of revenues are customer project driven, which includes a minority of revenues derived from the sale of customer specified customized products that have no alternative use to us. The manufacturing cycle for these custom products is typically short. Incremental costs to fulfill our customer arrangements are expensed as incurred, as the amortization period is less than one year. Our products are sold with normal and customary return provisions. We provide limited warranties for defects in materials or factory workmanship, sagging and warping, and certain other manufacturing defects. Warranties are not sold separately to customers. Our product warranties place certain requirements on the purchaser, including installation and maintenance in accordance with our written instructions. In addition to our warranty program, under certain limited circumstances, we will occasionally at our sole discretion provide a customer accommodation repair or replacement. Warranty repairs and replacements are most commonly made by professional installers employed by or affiliated with our independent distributors. Reimbursement for costs associated with warranty repairs are provided to our independent distributors through a credit against accounts receivable from the distributor to us. Sales returns and warranty claims have historically not been material and do not constitute separate performance obligations. We often offer incentive programs to our customers, primarily volume rebates and promotions. The majority of our rebates are designated as a percentage of annual customer purchases. We estimate the amount of rebates based on actual sales for the period and accrue for the projected incentive programs’ costs. We record the costs of rebate accruals as a reduction to the transaction price. See Note 4 to the Consolidated Financial Statements for additional information related to our revenues. Shipping and Handling Costs . We account for product shipping and handling costs as fulfillment activities and present the associated costs in costs of goods sold in the period in which we sell our product. Advertising Costs . We recognize advertising expenses as they are incurred. Research and Development Costs . We expense research and development costs as they are incurred. Business Combinations . We account for acquisitions under the acquisition method and the results of acquired operations are included in the Consolidated Financial Statements from the acquisition date. Acquisition related costs are expensed as incurred. We allocate total consideration to the assets acquired and liabilities assumed based on their estimated fair values, with the remaining unallocated amount recorded as goodwill. Our definite-lived intangible assets are amortized over each respective asset's estimated useful life on a straight-line basis and recorded as a component of operating income (expense). The fair value of acquired intangible assets is estimated by applying discounted cash flow models based on significant inputs not observable in the market. Key assumptions are developed based on each acquirees’ historical experience, future projections and comparable market data including future cash flows, long-term growth rates, implied royalty rates, attrition rates and discount rates. Acquisition-related contingent consideration that is classified as a liability is measured at fair value at the acquisition date. Changes in the fair value of contingent consideration liabilities in reporting periods after the acquisition date are recorded within our Consolidated Statements of Operations and Comprehensive Income. Pension and Postretirement Benefits . We have benefit plans that provide for pension, medical and life insurance benefits to certain eligible employees when they retire from active service. See Note 18 to the Consolidated Financial Statements for disclosures on pension and postretirement benefits. Taxes . The provision for income taxes has been determined using the asset and liability approach of accounting for income taxes to reflect the expected future tax consequences of events recognized in the financial statements. Deferred income tax assets and liabilities are recognized by applying enacted tax rates to temporary differences that exist as of the balance sheet date, which result from differences in the timing of reported taxable income between tax and financial reporting. We reduce the carrying amounts of deferred tax assets by a valuation allowance if, based on the available evidence, it is more likely than not that such assets will not be realized. The need to establish valuation allowances for deferred tax assets is assessed quarterly. In assessing the requirement for, and amount of, a valuation allowance in accordance with the more likely than not standard, we give appropriate consideration to all positive and negative evidence related to the realization of the deferred tax assets. This assessment considers, among other matters, the nature, frequency and severity of current and cumulative losses and forecasts of future profitability, the duration of statutory carryforward periods, and our experience with operating loss and tax credit carryforward expirations. A history of cumulative losses is a significant piece of negative evidence used in our assessment. If a history of cumulative losses is incurred for a tax jurisdiction, forecasts of future profitability are generally not used as positive evidence related to the realization of the deferred tax assets in the assessment. We recognize the tax benefits of an uncertain tax position if those benefits are more likely than not to be sustained based on existing tax law. Additionally, we establish a reserve for tax positions that are more likely than not to be sustained based on existing tax law, but uncertain in the ultimate benefit to be sustained upon examination by the relevant taxing authorities. Unrecognized tax benefits are subsequently recognized at the time the more likely than not recognition threshold is met, the tax matter is effectively settled or the statute of limitations for the relevant taxing authority to examine and challenge the tax position has expired, whichever is earliest. Taxes collected from customers and remitted to governmental authorities are reported on a net basis. Earnings per Share . Basic earnings per share is computed by dividing the earnings attributable to common shares by the weighted average number of shares of common stock outstanding during the period. Diluted earnings per share reflects the potential dilution of securities that could share in the earnings and is calculated using the treasury stock method. Cash and Cash Equivalents . Cash and cash equivalents include cash on hand and short-term investments that have maturities of three months or less when purchased. Concentration of Credit . We principally sell products to customers in building products industries. We monitor the creditworthiness of our customers and generally do not require collateral. Revenues from two commercial distributors, included within our Mineral Fiber and Architectural Specialties segments, individually exceeded 10 % of our revenues in 2022, 2021 and 2020. Gross sales to these two customers totaled $ 547.8 million, $ 495.8 million and $ 370.3 million in 2022, 2021 and 2020, respectively. Receivables . We sell our products to select, pre-approved customers using customary trade terms that allow for payment in the future. Customer trade and miscellaneous receivables (which include supply related rebates and other), net of allowances for doubtful accounts, customer credits and warranties, are reported in accounts and notes receivable, net. Cash flows from the collection of receivables are classified as operating cash flows on the Consolidated Statements of Cash Flows. We establish creditworthiness prior to extending credit. We estimate the recoverability of receivables each period. This estimate is based upon new information in the period, which can include the review of any available financial statements and forecasts, as well as discussions with legal counsel and the management of the debtor company. When events occur that impact the collectability of the receivable, all or a portion of the receivable is reserved. Account balances are charged off against the allowance when the potential for recovery is considered remote. We do not have any off-balance sheet credit exposure related to our customers. Inventories . Inventories are valued at the lower of cost and net realizable value. See Note 8 to the Consolidated Financial Statements for further information on our accounting for inventories. Property Plant and Equipment . Property plant and equipment is recorded at cost reduced by accumulated depreciation and amortization. Depreciation and amortization expense is recognized on a straight-line basis over the assets’ estimated useful lives. Machinery and equipment includes manufacturing equipment (depreciated over 2 to 15 years ), computer equipment (depreciated over 3 to 5 years ) and office furniture and equipment (depreciated over 5 to 7 years ). Within manufacturing equipment, assets that are subject to accelerated obsolescence or wear out quickly, such as dryer components, are generally depreciated over shorter periods while heavy production equipment, such as conveyors and production presses, are generally depreciated over longer periods. Buildings are depreciated over 15 to 30 years , depending on factors such as type of construction and use. Computer software is amortized over 3 to 7 years . Property, plant and equipment is tested for impairment by asset group when indicators of impairment are present, such as operating losses and/or negative cash flows for each identified asset group. If an indication of impairment exists, we compare the carrying amount of the asset group to the estimated undiscounted future cash flows expected to be generated by the asset group. If the carrying value exceeds the undiscounted future cash flows, we determine the fair value of the asset group based on discounted future cash flows expected to be generated by the asset group, or based on management’s estimated exit price assuming the assets could be sold in an orderly transaction between market participants, or estimated salvage value if no sale is assumed. If the fair value is less than the carrying value of the asset group, we record an impairment charge equal to the difference between the fair value and carrying value of the asset group. Impairments of assets related to our manufacturing operations are recorded in cost of goods sold. We did not test tangible assets within our continuing operations for impairment in 2022, 2021 or 2020 as no indicators of impairment existed. When assets are disposed of or retired, their costs and related depreciation or amortization are removed from the financial statements, and any resulting gains or losses are normally reflected in cost of goods sold or selling, general and administrative (“SG&A”) expenses depending on the nature of the asset. Leases . We enter into operating and finance leases for certain manufacturing plants, warehouses, equipment and automobiles. Our leases have remaining lease terms of up to 15 years. Several leases include options for us to purchase leased items at fair value or renew for up to 5 years, or multiple 5-year renewal periods. Some of our leases include early termination options. We consider all of these options in determining the lease term used to establish our right-of-use (“ROU”) assets and lease liabilities when it is reasonably certain that we will exercise that option. Our lease agreements do not contain any residual value guarantees or material restrictive covenants. We have lease agreements with lease and non-lease components, which we have elected to combine to determine the ROU assets and lease liabilities. Short-term leases with an initial term of 12 months or less are not recorded on the balance sheet. We recognize lease expense for these leases on a straight-line basis over the lease term. As most of our leases do not provide an implicit rate, we use our Incremental Borrowing Rate (“IBR”) based on information that is available at the lease commencement date to compute the present value of lease payments. Relevant information used in determining the IBR includes the transactional currency of the lease and the lease term. Asset Retirement Obligations . We recognize the fair value of obligations associated with the retirement of tangible long-lived assets in the period in which they are incurred. Upon initial recognition of a liability, the discounted cost is capitalized as part of the related long-lived asset and depreciated over the corresponding asset’s useful life. Over time, accretion of the liability is recognized as an operating expense to reflect the change in the liability’s present value. Goodwill and Intangible Assets . Our definite-lived intangible assets are primarily customer relationships (amortized over 2 to 20 years ), developed technology (amortized over 13 to 20 years ) and acquired internally-developed software (amortized over 7 years). We review definite-lived intangible assets for impairment by asset group when indicators of impairment are present, such as operating losses and/or negative cash flows for the respective asset group. If an indication of impairment exists, we compare the carrying amount of the asset group to the estimated undiscounted future cash flows expected to be generated by the asset group. If the carrying value exceeds the undiscounted future cash flows, we determine the fair value of the asset group based on discounted future cash flows expected to be generated by the asset group or based on management’s estimated exit price assuming the assets could be sold in an orderly transaction between market participants. If the fair value is less than the carrying value of the asset group, we record an impairment charge equal to the difference between the fair value and carrying value of the asset group. We did not test definite-lived intangible assets within our continuing operations for impairment in 2022, 2021 or 2020 as no indicators of impairment existed. Our indefinite-lived assets include goodwill and other intangibles, primarily trademarks and brand names, with Armstrong representing our primary trademark. Trademarks and brand names are integral to our corporate identity and are expected to contribute indefinitely to our cash flows. Accordingly, they have been assigned an indefinite life. We conduct our annual impairment tests on these indefinite-lived intangible assets and goodwill during the fourth quarter. These assets undergo more frequent tests if an indication of possible impairment exists. When performing an impairment test for indefinite-lived intangible assets and goodwill, we compare the carrying amount of the asset (when testing indefinite-lived intangible assets) and reporting unit (when testing goodwill) to the estimated fair value. For indefinite-lived intangible assets, the estimated fair value is based on discounted future cash flows using the relief from royalty method. For goodwill, the estimated fair value is based on discounted future cash flows expected to be generated by the reporting unit. If the fair value is less than the carrying value of the asset/reporting unit, we record an impairment charge equal to the difference between the fair value and carrying value of the asset/reporting unit. We did not test indefinite-lived intangible assets within our continuing operations for impairment during any interim periods during 2022, as no indicators of impairment existed. We completed our annual impairment test in the fourth quarter of 2022 and no impairment charges were recorded in 2022, 2021 or 2020. See Note 13 to the Consolidated Financial Statements for disclosure on intangible assets. Foreign Currency Transactions . Assets and liabilities of our subsidiaries operating outside the United States that are accounted in a functional currency other than U.S. dollars are translated using the period end exchange rate. Revenues and expenses are translated at exchange rates effective during each month. Foreign currency translation gains or losses are included as a component of accumulated other comprehensive (loss) within shareholders' equity. Gains or losses on foreign currency transactions are recognized through earnings . Financial Instruments and Derivatives . We use derivatives and other financial instruments to offset the effect of interest rate variability. Derivatives are recognized on the balance sheet at fair value. For derivatives that meet the criteria as designated cash flow hedges, the changes in the fair value of the derivative are recognized in other comprehensive (loss) income until the hedged item is recognized in operations. See Notes 19 and 20 to the Consolidated Financial Statements for further discussion. Share-based Employee Compensation . We generally recognize share-based compensation expense on a straight-line basis over the vesting period for the entire award. Compensation expense for performance-based awards with non-market-based conditions are also recognized over the vesting period for the entire award, however, compensation expense may vary based on the expectations for actual performance relative to defined performance measures. We estimate forfeitures based on actual historical forfeitures. See Note 22 to the Consolidated Financial Statements for additional information on share-based employee compensation. Treasury Stock . Common shares repurchased by AWI are recorded on the settlement date at cost as treasury shares and result in a reduction of equity. We may reissue these treasury shares. When treasury shares are reissued, we determine the cost using the First-in, first-out cost method (“FIFO”). The difference between the cost of the treasury shares and reissuance price is included in additional paid-in capital or retained earnings.

Nature Of Operations

Nature Of Operations	12 Months Ended
Nature Of Operations	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature Of Operations	NOTE 3. NATURE OF OPERATIONS Our operating segments are as follows: Mineral Fiber, Architectural Specialties and Unallocated Corporate. Mineral Fiber – produces suspended mineral fiber and soft fiber ceiling systems. Our mineral fiber products offer various performance attributes such as acoustical control, rated fire protection, aesthetic appeal, and health and sustainability features. Ceiling products are sold to resale distributors, ceiling systems contractors and wholesalers and retailers (including large home centers). The Mineral Fiber segment also includes the results of our Worthington Armstrong Venture (“WAVE”) joint venture with Worthington Industries, Inc., which manufactures and sells suspension system (grid) products and ceiling component products that are invoiced by both AWI and WAVE. Segment results relating to WAVE consist primarily of equity earnings and reflect our 50 % equity interest in the joint venture. Ceiling component products consist of ceiling perimeters and trim, in addition to grid products that support drywall ceiling systems. For some customers, WAVE sells its suspension systems products to AWI for resale to customers. Mineral Fiber segment results reflect those sales transactions. The Mineral Fiber segment also includes all assets and liabilities not specifically allocated to our Architectural Specialties or Unallocated Corporate segment, including all property and related depreciation associated with our Lancaster, PA headquarters. Operating results for the Mineral Fiber segment include a significant majority of allocated Corporate administrative expenses that represent a reasonable allocation of general services to support its operations. Architectural Specialties – produces, designs and sources ceilings and walls for use in commercial settings. Products are available in numerous materials, such as metal, felt and wood, in addition to various colors, shapes and designs. Products offer various performance attributes such as acoustical control, rated fire protection and aesthetic appeal. We sell standard, premium and customized products, a portion of which are derived from sourced products. Architectural Specialties products are sold primarily to resale distributors and direct customers, primarily ceiling systems contractors. The majority of this segment's revenues are project driven, which can lead to more volatile sales patterns due to project scheduling uncertainty. Operating results for the Architectural Specialties segment include a portion of allocated Corporate administrative expenses that represent a reasonable allocation of general services to support its operations. Unallocated Corporate – includes certain assets, liabilities, income and expenses that have not been allocated to our other business segments and consists of: cash and cash equivalents, the net funded status of our U.S. Retirement Income Plan (“RIP”), the estimated fair value of interest rate swap contracts, outstanding borrowings under our senior secured credit facility and income tax balances. Our Unallocated Corporate segment also includes all expenses related to our German defined benefit pension plan that was formerly reported in our Europe, Middle East and Africa (including Russia) (“EMEA”) and Pacific Rim segments and was not included in the sale of certain subsidiaries comprising our businesses and operations in EMEA and the Pacific Rim, including the corresponding businesses and operations conducted by WAVE (collectively, the “Sale”) to Knauf International GmbH (“Knauf”). For the year ended 2022 Mineral Fiber Architectural Specialties Unallocated Total Net sales to external customers $ 887.4 $ 345.7 $ - $ 1,233.1 Equity (earnings) from joint venture ( 77.6 ) - - ( 77.6 ) Segment operating income (loss) 260.9 21.7 ( 3.9 ) 278.7 Segment assets 1,096.9 387.5 202.8 1,687.2 Depreciation and amortization 69.5 14.2 - 83.7 Investment in joint venture 23.9 - - 23.9 Purchases of property, plant and equipment 63.8 11.0 - 74.8 For the year ended 2021 Mineral Fiber Architectural Specialties Unallocated Total Net sales to external customers $ 818.5 $ 288.1 $ - $ 1,106.6 Equity (earnings) from joint venture ( 87.7 ) - - ( 87.7 ) Segment operating income (loss) 261.2 4.2 ( 5.4 ) 260.0 Segment assets 1,133.9 366.3 209.8 1,710.0 Depreciation and amortization 69.9 26.6 - 96.5 Investment in joint venture 50.0 - - 50.0 Purchases of property, plant and equipment 64.8 15.0 - 79.8 For the year ended 2020 Mineral Fiber Architectural Specialties Unallocated Total Net sales to external customers $ 726.0 $ 210.9 $ - $ 936.9 Equity (earnings) from joint venture ( 64.0 ) - - ( 64.0 ) Segment operating income 218.7 22.3 13.8 254.8 Segment assets 1,101.1 357.7 259.7 1,718.5 Depreciation and amortization 71.8 12.2 - 84.0 Investment in joint venture 41.2 - - 41.2 Purchases of property, plant and equipment 45.5 9.9 - 55.4 Segment operating income (loss) is the measure of segment profit or loss reviewed by the chief operating decision maker. The sum of the segments’ operating income (loss) equals the total consolidated operating income as reported on our Consolidated Statements of Operations and Comprehensive Income. The following reconciles our total consolidated operating income to earnings (loss) from continuing operations before income taxes. These items are only measured and managed on a consolidated basis: 2022 2021 2020 Total consolidated operating income $ 278.7 $ 260.0 $ 254.8 Interest expense 27.1 22.9 24.1 Other non-operating (income) expense, net ( 6.0 ) ( 5.6 ) 357.4 Earnings (loss) from continuing operations before income taxes $ 257.6 $ 242.7 $ ( 126.7 ) Accounting policies of the segments are the same as those described in the summary of significant accounting policies. The sales in the table below are allocated to geographic areas based on the location of our selling entities. 2022 2021 2020 Geographic Areas Net sales Mineral Fiber: United States $ 816.3 $ 754.2 $ 674.1 Canada 71.1 64.3 51.9 Total Mineral Fiber 887.4 818.5 726.0 Architectural Specialties: United States $ 322.1 $ 268.0 $ 192.8 Canada 23.6 20.1 18.1 Total Architectural Specialties 345.7 288.1 210.9 Total net sales $ 1,233.1 $ 1,106.6 $ 936.9 Our product-based Mineral Fiber and Architectural Specialties segment net sales represent the product-based group offerings we sell to external customers. 2022 2021 Property, plant and equipment, net at December 31, Mineral Fiber: United States $ 496.8 $ 490.6 Total Mineral Fiber 496.8 490.6 Architectural Specialties: United States $ 52.3 $ 46.5 Canada 5.3 5.7 Total Architectural Specialties 57.6 52.2 Total property, plant and equipment, net $ 554.4 $ 542.8 During 2020, we recorded a $ 21.0 million gain related to the sale of our idled mineral fiber plant in China, inclusive of accumulated foreign currency translation gains.

Revenue

Revenue	12 Months Ended
Revenue	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Revenue	NOTE 4. REVENUE Disaggregation of Revenues Our Mineral Fiber and Architectural Specialties operating segments both manufacture and sell ceiling and wall systems (primarily mineral fiber, fiberglass wool, metal, wood, wood fiber, glass-reinforced-gypsum and felt) throughout the Americas. We disaggregate revenue based on our product-based segments and major customer channels, as they represent the most appropriate depiction of how the nature, amount and timing of revenues and cash flows are affected by economic factors. Net sales by major customer channel are as follows: Distributors – represents net sales to building materials distributors who re-sell our products to contractors, subcontractors’ alliances, large architect and design firms, and major facility owners. Geographically, this category includes sales throughout the U.S., Canada, and Latin America. Home centers – represents net sales to home centers, such as Lowe’s Companies, Inc. and The Home Depot, Inc. This category includes sales primarily to U.S. customers. Direct customers – represents net sales to contractors, subcontractors, and large architect and design firms. This category includes sales primarily to U.S. customers. Retailers and other – represents net sales to independent retailers and certain national account customers, including wholesalers who re-sell our products to dealers who service builders, contractors and consumers, online customers, major facility owners, group purchasing organizations and maintenance, repair and operating entities. Geographically, this category includes sales throughout the U.S. and Canada, and Latin America. The following tables present net sales by major customer group within the Mineral Fiber and Architectural Specialties segments for the years ended December 31, 2022, 2021 and 2020: Mineral Fiber 2022 2021 2020 Distributors $ 654.1 $ 603.9 $ 525.2 Home centers 99.1 94.4 96.1 Direct customers 61.0 59.2 54.3 Retailers and other 73.2 61.0 50.4 Total $ 887.4 $ 818.5 $ 726.0 Architectural Specialties 2022 2021 2020 Distributors $ 174.4 $ 150.5 $ 135.5 Direct customers 168.0 134.6 73.3 Retailers and other 3.3 3.0 2.1 Total $ 345.7 $ 288.1 $ 210.9

Acquisitions

Acquisitions	12 Months Ended
Acquisitions	Dec. 31, 2022
Business Combinations [Abstract]
Acquisitions	NOTE 5. ACQUISITIONS GC PRODUCTS On November 4, 2022, we acquired the business and assets of GC Products for $ 2.8 million of cash. The total fair value of tangible assets acquired, less liabilities assumed, was $ 0.3 million. The total fair value of intangible assets acquired was $ 1.8 million, resulting in goodwill of $ 0.7 million. Identified intangible assets consist primarily of amortizable technologies of $ 0.7 million, amortizable customer relationships of $ 0.6 million, and a non-compete agreement of $ 0.2 million. All of the acquired goodwill is deductible for tax purposes. The 2022 acquisition of GC Products did not have a material impact on reported net sales or net earnings for the year ended December 31, 2022. ARKTURA On December 16, 2020, we acquired all the issued and outstanding equity of Arktura and its subsidiaries with operations in the United States and Argentina for $ 91.2 million, net of $ 0.1 million of cash acquired and working capital adjustments. A portion of the cash consideration paid at closing is being held in escrow to secure potential claims for indemnification under the agreement. Under the terms of the agreement, and contingent upon continued employment with AWI, we are obligated to pay the sellers an additional $ 24.0 million in cash payments over a period of five years and issued an additional $ 6.0 million of restricted stock which will vest over a period of five years . Contingent upon employment with AWI, we also issued an additional $ 1.4 million of restricted stock to key Arktura employees which will vest over a period of three years . Compensation expense associated with these cash payments and restricted stock awards are recorded over the required service and vesting periods. The total fair value of tangible assets acquired, less liabilities assumed, was $ 0.9 million. The acquisition resulted in $ 57.4 million of goodwill. The following table summarizes the fair values of identifiable intangible assets acquired, and their estimated useful lives: Fair Value at Acquisition Date Estimated Useful Life Tradenames $ 12.1 Indefinite Software 9.1 7 years Backlog 5.5 1 year Customer relationships 3.6 1 year Non-compete agreements 2.1 5 years Patents 0.6 13 - 19 years Total identifiable intangible assets $ 33.0 The weighted average amortization period for acquired intangible assets as of the date of acquisition was 4.3 years. Goodwill from the Arktura acquisition relates to many factors, including the technical competencies and capabilities of the acquired workforce in the fields of architecture, design, materials science, technology and software, and our strategic intent to integrate and leverage those competencies and capabilities to advance and expand our portfolio of solutions and offerings. All of the acquired goodwill is deductible for tax purposes. In connection with the Arktura acquisition, we formed Arktura Ventures LLC, an incubator entity for the development and commercialization of new products and solutions in the architecture, engineering and construction spaces. As of December 31, 2022, the venture entity had minimal funding and operations. MOZ On August 24, 2020, we acquired the business and assets of Moz for $ 4.2 million of cash paid at closing and the potential for a contingent earn-out payable in 2022 not to exceed $ 4.7 million. We, with the assistance of an independent, third-party valuation specialist, utilized a Monte Carlo simulation to determine the estimated fair value of the contingent consideration at the acquisition date of $ 2.7 million, resulting in total acquisition consideration of $ 6.9 million. The total fair value of liabilities assumed, less tangible assets acquired, was $ 0.4 million. The total fair value of identifiable intangible assets acquired was $ 2.7 million, comprised of non-amortizable tradenames of $ 1.5 million, amortizable customer relationships of $ 0.6 million and backlog of $ 0.6 million, resulting in $ 4.6 million of goodwill. All of the acquired goodwill is deductible for tax purposes. The contingent consideration was payable upon achievement of certain performance objectives through December 31, 2021. The contingent consideration was classified as a current liability as of December 31, 2021, and was paid in the first quarter of 2022. See Note 19 for details related to the fair value of the contingent consideration. TURF On July 27, 2020, we acquired all the issued and outstanding capital stock of Turf for a purchase price of $ 70.0 million of cash paid at closing and the potential for a contingent earn-out payable in 2022 and 2023 not to exceed $ 48.0 million. We, with the assistance of an independent, third-party valuation specialist, utilized a Monte Carlo simulation to determine the estimated fair value of the contingent consideration at the acquisition date of $ 14.1 million, resulting in total acquisition consideration of $ 84.1 million. The total fair value of tangible assets acquired, less liabilities assumed, was $ 4.8 million. The total fair value of identifiable intangible assets acquired was $ 27.9 million, resulting in $ 51.4 million of goodwill. We identified non-amortizable tradenames of $ 9.6 million. We also identified amortizable intangible assets comprised of customer relationships of $ 7.7 million, patents of $ 5.8 million and a non-compete agreement of $ 3.3 million that are being amortized on a straight-line basis over their estimated useful lives of 2 , 20 , and 5 years, respectively. The weighted average amortization period for acquired intangible assets as of the date of acquisition was 8.3 years. Goodwill from the Turf acquisition relates to many factors, including the design talents of the acquired workforce, fabrication capabilities and capacity, broad-based go-to-market channels and relationships, established leadership in a growing product category, and our strategic intent to leverage its position and attributes to grow and expand our portfolio of solutions. All of the acquired goodwill is deductible for tax purposes. The contingent consideration is payable upon achievement of certain future performance objectives through 2022. The contingent consideration included up to $ 24.0 million in additional cash consideration for performance at certain revenue and earnings before interest, taxes, depreciation and amortization (“EBITDA”) growth targets. A portion of Turf's contingent consideration was payable upon the achievement of certain performance objectives through December 31, 2021, and the remaining portion is payable upon the achievement of certain performance objectives through December 31, 2022. The contingent consideration payable for the years ended December 31, 2022 and 2021 was classified as a current liability as of December 31, 2022 and 2021, and was paid in the first quarter of 2023 and 2022, respectively. See Note 19 for details related to the fair value of the contingent consideration. PRO FORMA FINANCIAL INFORMATION The following table summarizes aggregate audited as reported information and aggregate unaudited pro forma information assuming the acquisitions of Arktura, Moz and Turf had occurred on January 1, 2020. The unaudited pro forma results include the depreciation and amortization associated with the acquired assets, compensation expense related to cash payments and equity awards granted to employees of the acquired companies and adjustments to net sales for the purchase accounting effects of recording deferred revenue at fair value. The unaudited pro forma results do not include any expected benefits of the acquisitions, adjustments to as reported changes in the fair value of the contingent consideration or adjustments to the effective tax rate. Accordingly, the unaudited pro forma results are not necessarily indicative of either future results of operations or results that might have been achieved had the acquisitions been consummated as of January 1, 2020. 2020 Net sales from continuing operations, pro forma (unaudited) $ 1,009.0 Net sales from continuing operations, as reported 936.9 Net loss from continuing operations, pro forma (unaudited) ( 69.2 ) Net loss from continuing operations, as reported ( 84.1 )

Discontinued Operations

Discontinued Operations	12 Months Ended
Discontinued Operations	Dec. 31, 2022
Discontinued Operations [Abstract]
Discontinued Operations	NOTE 6. DISCONTINUED OPERATIONS EMEA AND PACIFIC RIM BUSINESSES In 2019, we completed the Sale of certain subsidiaries to Knauf. In 2020, we recorded a pre-tax loss of $ 17.2 million, primarily related to an $ 11.4 million purchase price adjustment related to certain pension liabilities included in the Sale in addition to working capital and other adjustments. In 2021, we recorded a pre-tax loss on sale of $ 0.4 million for final purchase price adjustments related to certain pension liabilities included in the Sale and paid $ 11.8 million to Knauf related to this purchase price adjustment. In 2022, we recorded a $ 2.0 million tax benefit related to federal tax statute of limitation closures. FLOORING BUSINESSES Separation and Distribution of Armstrong Flooring, Inc. (“AFI”) On April 1, 2016, we completed our separation of AFI by transferring the assets and liabilities related primarily to our Resilient and Wood Flooring segments to AFI and then distributing the common stock of AFI to our shareholders at a ratio of one share of AFI common stock for every two shares of AWI common stock. In 2022, we recorded a $ 1.0 million tax benefit related to federal tax statute of limitation closures. European Resilient Flooring During 2020, we recorded a gain of $ 0.8 million related to Accumulated Other Comprehensive Income (“AOCI”) adjustments from a previously discontinued foreign flooring entity, which was dissolved in the second quarter of 2020. The AOCI adjustments related to accumulated foreign currency translation amounts. Summarized Financial Information of Discontinued Operations The following tables detail the businesses and line items that comprise discontinued operations on the Consolidated Statements of Operations and Comprehensive Income. EMEA and Pacific Rim Businesses Flooring Total 2022 Earnings from discontinued businesses before income tax $ - $ - $ - Income tax benefit ( 2.0 ) ( 1.0 ) ( 3.0 ) Net earnings from discontinued operations, net of tax $ 2.0 $ 1.0 $ 3.0 Net earnings from discontinued operations $ 2.0 $ 1.0 $ 3.0 EMEA and Pacific Rim Businesses 2021 (Loss) from disposal of discontinued businesses, before income tax $ ( 0.4 ) Income tax expense 1.7 (Loss) from disposal of discontinued businesses, net of tax $ ( 2.1 ) Net (loss) from discontinued operations $ ( 2.1 ) EMEA and Pacific Rim Businesses Flooring Total 2020 (Loss) gain from disposal of discontinued businesses, before income tax $ ( 17.2 ) $ 0.8 $ ( 16.4 ) Income tax (benefit) ( 1.4 ) - ( 1.4 ) (Loss) gain from disposal of discontinued businesses, net of tax $ ( 15.8 ) $ 0.8 $ ( 15.0 ) Net (loss) earnings from discontinued operations $ ( 15.8 ) $ 0.8 $ ( 15.0 ) The following is a summary of total gains and losses related to our former EMEA and Pacific Rim businesses through the date of disposal, and gains on the dissolution of our previously discontinued flooring entity, which are presented as discontinued operations and included as components of operating and investing cash flows on our Consolidated Statements of Cash Flows: 2021 2020 Loss on sale to Knauf (1) $ 0.4 $ 17.2 Gain on dissolution of flooring entity (2) - ( 0.8 ) (1) Represents certain pension liabilities, working capital and other adjustments. (2) Represents AOCI adjustments related to accumulated foreign currency translation amounts.

Accounts and Notes Receivable

Accounts and Notes Receivable	12 Months Ended
Accounts and Notes Receivable	Dec. 31, 2022
Receivables [Abstract]
Accounts and Notes Receivable	NOTE 7. ACCOUNTS AND NOTES RECEIVABLE December 31, 2022 December 31, 2021 Customer receivables $ 107.4 $ 104.7 Miscellaneous receivables 8.2 7.9 Less allowance for warranties, discounts and losses ( 3.2 ) ( 3.5 ) Accounts and notes receivable, net $ 112.4 $ 109.1 We sell our products to select, pre-approved customers whose businesses are affected by changes in economic and market conditions. We consider these factors and the financial condition of each customer when establishing our allowance for losses from doubtful accounts. As of December 31, 2022 and 2021, miscellaneous receivables included $ 4.8 million and $ 5.9 million of Employee Retention Credit (“ERC”) receivables, respectively, representing a refundable payroll tax credit for eligible wages paid to our employees in 2020 and 2021 under the Coronavirus Aid, Relief, and Economic Recovery Act (“CARES Act”). During the first quarter of 2023, we received $ 4.1 million of outstanding ERC receivables. See Note 16 to the Consolidated Financial Statements for further information.

Inventories

Inventories	12 Months Ended
Inventories	Dec. 31, 2022
Inventory Disclosure [Abstract]
Inventories	NOTE 8. INVENTORIES December 31, 2022 December 31, 2021 Finished goods $ 60.9 $ 49.9 Goods in process 6.5 6.4 Raw materials and supplies 63.0 48.4 Less LIFO reserves ( 20.4 ) ( 14.5 ) Total inventories, net $ 110.0 $ 90.2 Approximately 58 % and 66 % of our total inventory in 2022 and 2021, respectively, were valued on a Last-in, first-out (“LIFO”) basis. The distinction between the use of different methods of inventory valuation is primarily based on type of inventory, legal entities and/or geographical locations. The following table summarizes the amount of inventory that is not accounted for under the LIFO method. December 31, 2022 December 31, 2021 U.S. locations $ 43.2 $ 28.0 Canada locations 3.1 2.7 Total $ 46.3 $ 30.7 U.S. locations above generally use the weighted average cost method of inventory valuation and primarily represent certain finished goods sourced from third party suppliers and certain entities within our Architectural Specialties segment, most notably recent acquisitions, that also use the weighted average cost method given the nature of the inventory. Our Canadian locations use the FIFO method of inventory valuation (or other methods which closely approximate the FIFO method) primarily because the LIFO method is not permitted for local tax reporting purposes. In these situations, a conversion to LIFO would be highly complex and involve excessive cost and effort to achieve under local tax reporting requirements.

Other Current Assets

Other Current Assets	12 Months Ended
Other Current Assets	Dec. 31, 2022
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Other Current Assets	NOTE 9. OTHER CURRENT ASSETS December 31, 2022 December 31, 2021 Prepaid expenses $ 16.6 $ 17.2 Assets held for sale 4.6 4.6 Fair value of derivative assets 3.7 - Other 1.4 1.3 Total other current assets $ 26.3 $ 23.1 As of December 31, 2022 and 2021, assets held for sale included the property, plant and equipment of our idled Mineral Fiber plant in St. Helens, Oregon.

Property, Plant And Equipment

Property, Plant And Equipment	12 Months Ended
Property, Plant And Equipment	Dec. 31, 2022
Property, Plant and Equipment [Abstract]
Property, Plant And Equipment	NOTE 10. PROPERTY, PLANT AND EQUIPMENT December 31, 2022 December 31, 2021 Land $ 31.8 $ 31.8 Buildings 267.8 257.2 Machinery and equipment 686.1 643.9 Computer software 69.2 52.6 Construction in progress 49.0 51.3 Less accumulated depreciation and amortization ( 549.5 ) ( 494.0 ) Net property, plant and equipment $ 554.4 $ 542.8

Equity Investments

Equity Investments	12 Months Ended
Equity Investments	Dec. 31, 2022
Equity Method Investments and Joint Ventures [Abstract]
Equity Investments	NOTE 11. EQUITY INVESTMENTS Investment in joint venture as of December 31, 2022 and 2021 reflected the equity interest in our 50 % investment in our WAVE joint venture. The WAVE joint venture is reflected within the Mineral Fiber segment in our consolidated financial statements using the equity method of accounting. We use the cumulative earnings approach to determine the appropriate classification of distributions from WAVE within our cash flow statement. For all years presented, cumulative distributions received in prior periods, less distributions that were returns of investment, exceeded our cumulative equity earnings from WAVE as adjusted for the amortization of basis differences. Accordingly, the distributions were reflected as returns of investment in cash flows from investing activity in our Consolidated Statements of Cash Flows for all years presented. Distributions from WAVE in 2022, 2021 and 2020, were $ 104.5 million, $ 78.3 million, and $ 81.5 million, respectively. In certain markets, we sell WAVE products directly to customers pursuant to specific terms of sale. In those circumstances, we record the sales and associated costs within our consolidated financial statements. The total sales associated with these transactions were $ 47.3 million, $ 42.3 million and $ 35.2 million for the years ended 2022, 2021 and 2020, respectively. Condensed financial data for WAVE is summarized below. December 31, 2022 December 31, 2021 Current assets $ 100.8 $ 119.7 Non-current assets (1) 86.3 42.1 Current liabilities (1) 31.3 37.1 Other non-current liabilities (1) 372.3 297.4 (1) Includes initial ROU assets and lease liabilities of $ 29.4 million recognized upon adoption of Accounting Standards Codification Topic 842 – Leases on January 1, 2022. 2022 2021 2020 Net sales $ 458.2 $ 430.8 $ 343.3 Gross profit 231.1 244.5 194.7 Net earnings 163.7 184.6 137.8 Our recorded investment in WAVE was higher than our 50 % share of the carrying values reported in WAVE’s consolidated financial statements by $ 132.2 million as of December 31, 2022 and $ 136.4 million as of December 31, 2021. These differences are due to our adoption of fresh-start reporting upon emergence from Chapter 11 in October 2006, while WAVE’s consolidated financial statements do not reflect fresh-start reporting. The differences are composed of the following fair value adjustments to assets: December 31, 2022 December 31, 2021 Property, plant and equipment $ 0.4 $ 0.4 Other intangibles 101.4 105.6 Goodwill 30.4 30.4 Total $ 132.2 $ 136.4 Other intangibles include customer relationships and trademarks. Customer relationships are amortized over 20 years and trademarks have an indefinite life. Management regularly evaluates its investment in WAVE for impairment. Based on those evaluations, management concluded that its investment in WAVE was not impaired in 2022, 2021 or 2020. See discussion in Note 26 to the Consolidated Financial Statements for additional information on this related party.

Leases

Leases	12 Months Ended
Leases	Dec. 31, 2022
Leases [Abstract]
Leases	NOTE 12. LEASES The following table presents our lease costs: 2022 2021 2020 Operating lease cost $ 7.0 $ 6.4 $ 5.6 Finance lease cost: Amortization of leased assets $ 2.4 $ 2.4 $ 2.0 Interest on lease liabilities 0.6 0.7 0.6 Total finance lease cost $ 3.0 $ 3.1 $ 2.6 Short-term lease expense and variable lease cost were not material for the years ended December 31, 2022, 2021 and 2020. As of December 31, 2022, we did not have any material leases that have not yet commenced. The following table presents supplemental cash flow information related to our leases: 2022 2021 2020 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases $ 6.8 $ 6.3 $ 5.4 Operating cash flows from finance leases 0.6 0.7 0.6 Financing cash flows from finance leases 2.2 2.1 1.8 ROU assets obtained in exchange for lease liabilities Operating leases (1) $ 3.9 $ 7.3 $ 5.4 Finance leases - 0.3 2.6 (1) The years ended December 31, 2022, 2021 and 2020 include increases in ROU assets of $ 1.0 million, $ 3.2 million and $ 0.4 million, respectively, resulting from modifications that did not involve obtaining a new ROU asset. Modifications resulted primarily from changes in the terms of existing leases. The following table presents the weighted average assumptions used to compute our ROU assets and lease liabilities: December 31, 2022 December 31, 2021 Weighted average remaining lease term (in years) Operating leases 5.1 5.4 Finance leases 9.4 9.9 Weighted average discount rate Operating leases 3.8 % 3.4 % Finance leases 3.7 % 3.6 % Undiscounted future minimum lease payments as of December 31, 2022, by year and in the aggregate, having non-cancelable lease terms in excess of one year are as follows: Operating Leases Finance Leases Maturity of lease liabilities 2023 $ 6.5 $ 2.8 2024 4.8 2.6 2025 2.9 2.3 2026 1.7 2.4 2027 1.6 2.5 Thereafter 3.9 7.6 Total lease payments 21.4 20.2 Less interest ( 2.3 ) ( 3.4 ) Present value of lease liabilities $ 19.1 $ 16.8

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
Goodwill and Intangible Assets	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	NOTE 13. GOODWILL AND INTANGIBLE ASSETS We conduct our annual impairment testing of goodwill and non-amortizing intangible assets during the fourth quarter. The 2022, 2021 and 2020 reviews concluded that no impairment charges were necessary. See Note 2 to the Consolidated Financial Statements for a discussion of our accounting policy for goodwill and intangible assets. The following table details amounts related to our goodwill and intangible assets as of December 31, 2022 and 2021: December 31, 2022 December 31, 2021 Estimated Gross Accumulated Amortization Gross Accumulated Amortization Amortizing intangible assets Customer relationships 2 - 20 years $ 182.1 $ 142.0 $ 196.7 $ 144.8 Developed technology 13 - 20 years 93.8 83.3 92.9 82.6 Software 7 years 9.1 2.6 9.1 1.3 Trademarks and brand names 3 - 10 years 4.0 2.6 4.0 2.0 Non-compete agreements 3 - 5 years 5.8 2.6 5.6 1.4 Other Various 1.1 0.1 0.4 0.1 Total $ 295.9 $ 233.2 $ 308.7 $ 232.2 Non-amortizing intangible assets Trademarks and brand names Indefinite 345.0 344.9 Total intangible assets $ 640.9 $ 653.6 Goodwill Indefinite $ 167.3 $ 167.0 2022 2021 2020 Amortization expense $ 16.3 $ 33.8 $ 22.1 The expected annual amortization expense for the years 2023 through 2027 are as follows: 2023 $ 13.9 2024 13.4 2025 12.7 2026 9.2 2027 3.1

Other Non-Current Assets

Other Non-Current Assets	12 Months Ended
Other Non-Current Assets	Dec. 31, 2022
Other Assets, Noncurrent Disclosure [Abstract]
Other Non-Current Assets	NOTE 14. OTHER NON-CURRENT ASSETS December 31, 2022 December 31, 2021 Cash surrender value of company-owned life insurance policies $ 42.8 $ 47.2 Investment in employee deferred compensation plans 7.7 9.7 Fair value of derivative assets 7.7 - Other 1.2 1.0 Total other non-current assets $ 59.4 $ 57.9

Accounts Payable And Accrued Ex

Accounts Payable And Accrued Expenses	12 Months Ended
Accounts Payable And Accrued Expenses	Dec. 31, 2022
Payables and Accruals [Abstract]
Accounts Payable And Accrued Expenses	NOTE 15. ACCOUNTS PAYABLE AND ACCRUED EXPENSES December 31, 2022 December 31, 2021 Payables, trade and other $ 105.0 $ 105.8 Employment costs 20.0 30.3 Current portion of pension and postretirement liabilities 9.9 9.9 Acquisition-related contingent consideration 15.2 8.6 Other 22.4 20.3 Total accounts payable and accrued expenses $ 172.5 $ 174.9

Income Taxes

Income Taxes	12 Months Ended
Income Taxes	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Income Taxes	NOTE 16. INCOME TAXES The tax effects of principal temporary differences between the carrying amounts of assets and liabilities and their tax basis are summarized below. Management believes it is more likely than not that the results of future operations will generate sufficient taxable income in the appropriate jurisdiction to realize deferred tax assets, net of valuation allowances. In arriving at this conclusion, we considered the profit before tax generated for the years 2020 through 2022, future reversals of existing taxable temporary differences, and projections of future profit before tax. We reduce the carrying amounts of deferred tax assets by a valuation allowance if, based on the available evidence, it is more likely than not that such assets will not be realized. The need to establish valuation allowances for deferred tax assets is assessed quarterly. In assessing the requirement for, and amount of, a valuation allowance in accordance with the more likely than not standard for all periods, we consider all positive and negative evidence related to the realization of the deferred tax assets. This assessment considers, among other matters, the nature, frequency and severity of current and cumulative losses and forecasts of future profitability, the duration of statutory carryforward periods, and our experience with operating loss and tax credit carryforward expirations. A history of cumulative losses is a significant piece of negative evidence used in our assessment. If a history of cumulative losses is incurred for a tax jurisdiction, forecasts of future profitability are not used as positive evidence related to the realization of the deferred tax assets in the assessment. As of December 31, 2022 and 2021, we had $ 675.5 million and $ 700.9 million, respectively, of gross state net operating loss (“NOL”) carryforwards expiring between 2023 and 2042 . As of December 31, 2022, we had capital loss carryforwards of $ 18.8 million that expire between 2024 and 2036. Capital loss carryforwards as of December 31, 2021 were $ 18.8 million. As of December 31, 2022, we did not have any foreign tax credit (“FTC”) carryforwards. U.S. FTC carryforwards as of December 31, 2021 were $ 0.6 million. As of December 31, 2022 and 2021, we had valuation allowances of $ 48.7 million and $ 60.6 million, respectively. As of December 31, 2022, our valuation allowance consisted of $ 28.0 million for state deferred tax assets related to operating loss carryforwards, $ 17.4 million for federal and state deferred tax assets related to capital loss carryforwards and $ 3.3 million for state deferred tax assets related to state tax credits. We estimate we will need to generate future taxable income of approximately $ 360.1 million for state income tax purposes during the respective realization periods (ranging from 2023 to 2042 ) to be able to fully realize the net deferred income tax assets discussed above. We estimate we will need to generate capital gain income of $ 66.4 million to fully realize our federal capital loss carryforwards before they expire between 2024 and 2026 . We estimate we will need to generate capital gain income of $ 184.6 million to fully realize our state capital loss carryforwards before they expire between 2024 and 2036 . Our ability to utilize deferred tax assets may be impacted by certain future events, such as changes in tax legislation or insufficient future taxable income prior to expiration of certain deferred tax assets. December 31, 2022 December 31, 2021 Deferred income tax assets (liabilities) Net operating losses $ 34.2 $ 42.5 Postretirement benefits 16.7 20.7 Pension benefit liabilities 8.2 11.0 Deferred compensation 7.1 7.9 Foreign tax credit carryforwards - 0.6 State tax credit carryforwards 4.7 8.7 Capital loss carryforwards 18.8 18.8 Capitalized research expenses 9.4 - Lease right-of-use liabilities 9.7 9.8 Other 3.8 12.3 Total deferred income tax assets 112.6 132.3 Valuation allowances ( 48.7 ) ( 60.6 ) Net deferred income tax assets 63.9 71.7 Intangibles ( 85.1 ) ( 87.4 ) Partnerships and investments ( 25.5 ) ( 26.4 ) Accumulated depreciation ( 86.4 ) ( 80.4 ) Prepaid pension costs ( 21.2 ) ( 27.8 ) Inventories ( 4.9 ) ( 4.9 ) Lease right-of-use assets ( 9.9 ) ( 10.1 ) Other ( 0.3 ) ( 1.6 ) Total deferred income tax liabilities ( 233.3 ) ( 238.6 ) Net deferred income tax liabilities $ ( 169.4 ) $ ( 166.9 ) 2022 2021 2020 Details of taxes Earnings (loss) from continuing operations before income taxes Domestic $ 251.7 $ 239.3 $ ( 130.0 ) Foreign 5.9 3.4 3.3 Total $ 257.6 $ 242.7 $ ( 126.7 ) Income tax expense (benefit): Current: Federal $ 46.3 $ 39.4 $ 40.8 Foreign 1.3 0.6 1.0 State 11.3 8.7 5.6 Total current 58.9 48.7 47.4 Deferred: Federal ( 1.9 ) 3.6 ( 75.5 ) Foreign ( 0.2 ) 0.6 - State 0.9 4.5 ( 14.5 ) Total deferred ( 1.2 ) 8.7 ( 90.0 ) Total income tax expense (benefit) $ 57.7 $ 57.4 $ ( 42.6 ) The unremitted earnings of our foreign subsidiaries are not permanently reinvested. Accordingly, at December 31 2022 and 2021, we have recorded deferred income taxes for foreign withholding taxes of $ 0.9 million and $ 0.7 million on approximately $ 17.7 million and $ 13.0 million of net undistributed earnings of foreign subsidiaries, respectively. 2022 2021 2020 Reconciliation to U.S. statutory tax rate Continuing operations tax expense (benefit) at statutory rate $ 54.1 $ 51.0 $ ( 26.6 ) Decrease in valuation allowances on deferred income tax assets ( 1.7 ) ( 17.8 ) ( 0.1 ) Expiration of deferred income tax assets 0.7 18.3 - State income tax expense (benefit), net of federal impact 11.0 11.0 ( 7.3 ) Capital loss on sale of investment - - ( 4.6 ) Statute closures ( 5.1 ) ( 3.8 ) ( 1.3 ) State deferred tax adjustments - - ( 1.5 ) Excess tax benefits on share-based compensation ( 0.5 ) ( 0.8 ) ( 0.9 ) U.S. permanent differences ( 0.8 ) ( 1.3 ) ( 2.2 ) Other - 0.8 1.9 Tax expense (benefit) at effective rate $ 57.7 $ 57.4 $ ( 42.6 ) We recognize the tax benefits of an uncertain tax position only if those benefits are more likely than not to be sustained based on existing tax law. Additionally, we establish a reserve for tax positions that are more likely than not to be sustained based on existing tax law, but uncertain in the ultimate benefit to be sustained upon examination by the relevant taxing authorities. Unrecognized tax benefits are subsequently recognized at the time the more likely than not recognition threshold is met, the tax matter is effectively settled or the statute of limitations for the relevant taxing authority to examine and challenge the tax position has expired, whichever is earlier. We had $ 27.3 million of Unrecognized Tax Benefits (“UTB”) as of December 31, 2022, $ 11.5 million ($ 10.6 million, net of federal benefit) of this amount, if recognized in future periods, would impact the reported effective tax rate. It is reasonably possible that certain UTB’s may increase or decrease within the next twelve months due to tax examination changes, settlement activities, expirations of statute of limitations, or the impact on recognition and measurement considerations related to the results of published tax cases or other similar activities. Over the next twelve months we estimate that UTB’s may decrease by $ 0.1 million related to state statutes expiring. We account for all interest and penalties on uncertain income tax positions as income tax expense. We have $ 1.7 million of interest and penalties accrued in non-current income tax payable in the Consolidated Balance Sheet as of December 31, 2022. We had the following activity for UTB’s for the years ended December 31, 2022, 2021 and 2020: 2022 2021 2020 Unrecognized tax benefits balance at January 1, $ 35.6 $ 41.7 $ 34.7 Gross change for current year positions 0.4 1.7 2.3 Increase for prior period positions 0.2 - 8.7 Decrease for prior period positions ( 1.4 ) ( 3.6 ) - Decrease due to statute expirations ( 7.5 ) ( 4.2 ) ( 4.0 ) Unrecognized tax benefits balance at December 31, $ 27.3 $ 35.6 $ 41.7 We file income tax returns in the U.S. and various states and international jurisdictions. In the normal course of business, we are subject to examination by taxing authorities in Canada and the United States. Generally, we have open tax years subject to tax audit on average of between three years and six years . The statute of limitations is no longer open for U.S. federal returns before 2018. However, the U.S. federal return remains subject to examination by taxing authorities for 2017, specifically as it relates to the Section 965 Transition Tax incurred related to the Tax Cuts and Jobs Act of 2017. With few exceptions, the statute of limitations is no longer open for state or non-U.S. income tax examinations for years before 2018. With the exception of extending the 2018 and 2019 statute of limitations to July 31, 2023 as a result of ongoing U.S. federal income tax audits, we have not significantly extended any open statutes of limitation for any major jurisdiction and have reviewed and accrued for, where necessary, tax liabilities for open periods. 2022 2021 2020 Other taxes Payroll taxes $ 18.3 $ 13.4 $ 15.6 Property, franchise and capital stock taxes 4.5 4.4 4.2 In 2021, we recorded a $ 5.9 million ERC benefit, representing a refundable payroll tax credit for eligible wages paid to our employees in 2020 and 2021 under the CARES Act. We accounted for the ERC by applying the grant model . Based on our evaluation, we recognized the ERC benefit during 2021, primarily as an offset to payroll tax expenses within cost of goods sold and SG&A expenses in our Consolidated Statements of Operations and Comprehensive Income.

Debt

Debt	12 Months Ended
Debt	Dec. 31, 2022
Debt Disclosure [Abstract]
Debt	NOTE 17. DEBT December 31, 2022 December 31, 2021 Revolving credit facility due 2027 $ 205.0 $ - Revolving credit facility due 2024 - 165.0 Term loan A due 2027 450.0 - Term loan A due 2024 - 468.7 Principal debt outstanding 655.0 633.7 Unamortized debt financing costs ( 3.9 ) ( 2.3 ) Long-term debt 651.1 631.4 Less current portion - 25.0 Total long-term debt, less current portion $ 651.1 $ 606.4 On December 7, 2022, we amended and restated our $ 1,000.0 million variable rate senior secured credit facility. The $ 950.0 million amended senior secured credit facility is comprised of a $ 500.0 million revolving credit facility (with a $ 150.0 million sublimit for letters of credit) and a $ 450.0 million Term Loan A. The terms of the amended senior secured credit facility resulted in a higher interest rate spread for both the revolving credit facility and Term Loan A ( 1.50 % over London Interbank Offered Rate (“LIBOR” ) to initially 1.625 % over the Secured Overnight Financing Rate ( “SOFR” ), plus a 10 -basis point SOFR adjustment). The interest rate can fluctuate based upon our election of the floating rate, with applicable margin subject to adjustment based on our consolidated net leverage ratio. We also extended the maturity of both the revolving credit facility and Term Loan A from September 2024 to December 2027 . In connection with the refinancing, we paid $ 3.1 million of bank, legal and other fees, of which $ 3.0 million were capitalized. These fees are reflected as a component of long-term debt and amortized into interest expense over the lives of the underlying debt. Additionally, during the fourth quarter of 2022, we wrote off $ 0.6 million of unamortized debt financing costs, included as a component of interest expense, related to our previous credit facility. The credit lines under our revolving credit facility are subject to immaterial annual commitment fees. We also have a $ 25.0 million bi-lateral letter of credit facility separate from the senior secured credit facility. The amended senior secured credit facility includes two financial covenants that require the ratio of consolidated EBITDA to consolidated cash interest expense minus cash consolidated interest income to be greater than or equal to 3.0 to 1.0 and requires the ratio of consolidated funded indebtedness, minus AWI and domestic subsidiary unrestricted cash and cash equivalents up to $ 100 million, to consolidated EBITDA to be less than or equal to 3.75 to 1.0 (subject to certain exceptions for certain acquisitions). As of December 31, 2022, we were in compliance with all covenants of the senior secured credit facility. Our debt agreements include other restrictions, including restrictions pertaining to the incurrence of additional debt, the redemption, repurchase or retirement of our capital stock, payment of dividends, and certain financial transactions as it relates to specified assets. We currently believe that default under these covenants is unlikely. Scheduled payments of long-term debt: 2023 $ - 2024 22.5 2025 22.5 2026 22.5 2027 587.5 2028 and later - We utilize lines of credit and other commercial commitments in order to ensure that adequate funds are available to meet operating requirements. Letters of credit are currently arranged through our revolving credit facility and our bi-lateral facility. Letters of credit may be issued to third party suppliers, insurance and financial institutions and typically can only be drawn upon in the event of AWI’s failure to pay its obligations to the beneficiary. The following table presents details related to our letters of credit facilities: December 31, 2022 Financing Arrangements Limit Used Available Bi-lateral facility $ 25.0 $ 8.1 $ 16.9 Revolving credit facility 150.0 - 150.0 Total $ 175.0 $ 8.1 $ 166.9

Pension and Other Benefit Progr

Pension and Other Benefit Programs	12 Months Ended
Pension and Other Benefit Programs	Dec. 31, 2022
Retirement Benefits [Abstract]
Pensions and Other Benefit Programs	NOTE 18. PENSION AND OTHER BENEFIT PROGRAMS DEFINED CONTRIBUTION BENEFIT PLANS We sponsor several defined contribution plans, which cover substantially all U.S. and non-U.S. employees. Eligible employees may defer a portion of their pre-tax covered compensation on an annual basis. We match employee contributions up to pre-defined percentages. Employee contributions are 100 % vested. Employer contributions are vested based on pre-defined requirements. Costs for defined contribution benefit plans were $ 8.4 million in 2022, $ 9.1 million in 2021 and $ 8.1 million in 2020. DEFINED BENEFIT PENSION PLANS Benefits from defined benefit pension plans are based primarily on an employee's compensation and years of service. We fund our pension plans when appropriate. Our U.S. defined benefit pension plans include a qualified, funded RIP and a Retirement Benefit Equity Plan (“RBEP”), which is a nonqualified, unfunded plan designed to provide pension benefits in excess of the limits defined under Sections 415 and 401(a)(17) of the Internal Revenue Code. In the first quarter of 2020, we entered into agreements with Athene Annuity and Life Company (“AAIA”) and Athene Annuity & Life Assurance Company of New York (“AANY”) to transfer certain benefit obligations and assets of our RIP to AAIA and AANY. Under the agreements, we effectively settled $ 1,045.3 million of retiree defined benefit pension obligations related to approximately 10,000 retirees and beneficiaries (the “Transferred Participants”), which were irrevocably transferred to AAIA and AANY and which guarantees the pension benefits of the Transferred Participants. During the third quarter of 2020, these amounts were immaterially adjusted due to customary data reconciliations with AAIA and AANY. The Agreement did not impact our benefit obligations under the RBEP. As a result of the transaction, we recorded a $ 374.4 million settlement loss in the first quarter of 2020, which represented the release of amounts previously recorded in AOCI to other non-operating expense. The RIP’s assets and liabilities were remeasured as of the settlement date, resulting in a remaining projected benefit obligation of $ 387.5 million, immediately after remeasurement, which covered approximately 3,000 deferred vested and active participants, and fair value of plan assets of $ 499.6 million. The discount rate used to determine the projected benefit obligation at the settlement date was 3.07 %, compared to 3.16 % used as of December 31, 2019. The expected long-term return on plan assets remained at 5.25 % and did not change as a result of the settlement. During the third quarter of 2020, we offered an early retirement incentive benefit to employees at one of our manufacturing plants who met certain age and years of service criteria. The consideration period for eligible employees ended on September 30, 2020. Based on eligible employee elections to participate, we recorded a charge of $ 2.0 million within other non-operating expense, which increased the projected benefit obligation of the RIP. The enhanced retirement benefits did not result in a curtailment. We have a defined benefit pension plan in Germany which remains from previously discontinued entities. This plan uses assumptions which are consistent with, but not identical to, those of the U.S. plans. The accumulated benefit obligation for the non-U.S. defined benefit pension plan was $ 1.8 million and $ 2.5 million as of December 31, 2022 and 2021, respectively. The following tables summarize the balance sheet impact of our U.S. defined benefit pension plans, as well as the related benefit obligations, assets, funded status and rate assumptions. We use a December 31 measurement date for all our defined benefit pension plans. 2022 2021 Change in benefit obligations: Benefit obligations as of beginning of period $ 435.1 $ 441.7 Service cost 3.7 4.8 Interest cost 10.5 9.0 Actuarial (gain) ( 99.8 ) ( 10.9 ) Benefits paid ( 12.4 ) ( 9.5 ) Benefit obligations as of end of period $ 337.1 $ 435.1 2022 2021 Change in plan assets: Fair value of plan assets as of beginning of period $ 506.7 $ 520.7 Actual return on plan assets ( 105.4 ) ( 7.4 ) Employer contributions 2.8 2.9 Benefits paid ( 12.4 ) ( 9.5 ) Fair value of plan assets as of end of period $ 391.7 $ 506.7 Funded status $ 54.6 $ 71.6 2022 2021 Weighted-average assumptions used to determine benefit Discount rate 5.21 % 2.98 % Rate of compensation increase 3.33 % 3.05 % Weighted-average assumptions used to determine net periodic Discount rate 2.97 % 2.67 % Expected return on plan assets 3.75 % 3.25 % Rate of compensation increase 3.05 % 3.05 % Basis of Rate-of-Return Assumption Long-term asset class return assumptions for the RIP are determined based on input from investment professionals on the expected performance of the asset classes over 10 to 30 years . The forecasts were averaged to come up with consensus passive return forecasts for each asset class. Incremental components were added for the expected return from active management and asset class rebalancing based on historical information obtained from investment consultants. These forecasted gross returns were reduced by estimated management fees and expenses, yielding a long-term return forecast of 3.75 % and 3.25 % for the years ended December 31, 2022 and 2021, respectively. The accumulated benefit obligation for the U.S. defined benefit pension plans was $ 335.7 million and $ 433.2 million as of December 31, 2022 and 2021, respectively. In both 2022 and 2021, the largest contributor to the net actuarial gains affecting the benefit obligations for the defined benefit pension plans was an increase in the discount rate, which was partially offset by other changes in assumptions and changes in census data. 2022 2021 Pension plans with benefit obligations in excess of assets RBEP Projected benefit obligation, December 31 $ 28.6 $ 37.4 RBEP Accumulated benefit obligation, December 31 28.6 37.4 The components of the pension cost for the U.S. defined benefit pension plans are as follows: 2022 2021 2020 Service cost of benefits earned during the period $ 3.7 $ 4.8 $ 5.5 Interest cost on projected benefit obligation 10.5 9.0 15.5 Expected return on plan assets ( 18.4 ) ( 16.5 ) ( 34.5 ) Recognized net actuarial loss 4.2 3.5 6.3 Settlement - - 374.4 Special termination benefits - - 2.0 Net periodic pension cost $ - $ 0.8 $ 369.2 For 2022, 2021 and 2020, actuarial gains and losses were amortized over the remaining life expectancy of plan participants, which was approximately 26 years for 2022, 27 years for 2021 and 28 years for 2020 for our U.S. defined benefit pension plans. Investment Policies U.S. Pension Plans The RIP’s primary investment objective is to maintain the funded status of the plan such that the likelihood we will be required to make significant contributions to the plan is limited. This objective is expected to be achieved by (a) investing a substantial portion of the plan assets in high quality corporate bonds whose duration is at least equal to that of the plan’s liabilities, (b) investing in publicly traded equities in order to increase the ratio of plan assets to liabilities over time, (c) limiting investment return volatility by diversifying among additional asset classes with differing expected rates of return and return correlations, and/or (d) using derivatives to either implement investment positions efficiently or to hedge risk but not to create investment leverage. Each asset class utilized by the RIP has defined asset allocation targets and allowable ranges. The table below shows the asset allocation targets and the December 31, 2022 and 2021 positions for each asset class: Target Weight at December 31, Position at December 31, Asset Class 2022 2022 2021 Long duration bonds 90.0 % 90.0 % 89.0 % Equities, real estate and private equity 10.0 % 10.0 % 11.0 % Pension plan assets are required to be reported and disclosed at fair value. Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Three levels of inputs may be used to measure fair value: Level 1 - Quoted prices in active markets for identical assets or liabilities. Level 2 - Observable inputs other than quoted prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets; quoted prices for identical or similar assets and liabilities in markets that are not active; or other inputs that are observable or can be corroborated by observable market data. Level 3 - Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. This includes certain pricing models, discounted cash flow methodologies and similar techniques that use significant unobservable inputs. The asset’s fair value measurement level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. Valuation techniques used need to maximize the use of observable inputs and minimize the use of unobservable inputs. The following table sets forth by level within the fair value hierarchy a summary of the RIP plan assets measured at fair value on a recurring basis: Value at December 31, 2022 Description Level 1 Level 2 Level 3 Total Collective trust funds - bonds $ - $ 350.3 $ - $ 350.3 Collective trust funds - equities - 32.6 - 32.6 Cash, other short-term investments and payables, net ( 0.3 ) 3.5 - 3.2 Net assets measured at fair value $ ( 0.3 ) $ 386.4 $ - $ 386.1 Investments measured at net asset value as a practical expedient 5.6 Net assets $ 391.7 Value at December 31, 2021 Description Level 1 Level 2 Level 3 Total Collective trust funds - bonds $ - $ 451.9 $ - $ 451.9 Collective trust funds - equities - 46.8 - 46.8 Cash, other short-term investments and payables, net ( 0.3 ) 1.9 - 1.6 Net assets measured at fair value $ ( 0.3 ) $ 500.6 $ - $ 500.3 Investments measured at net asset value as a practical expedient 6.4 Net assets $ 506.7 The RIP has investments in alternative investment funds as of December 31, 2022 and 2021 which are reported at fair value. These investments that are measured at fair value using the net asset value (“NAV”) per share (or its equivalent) practical expedient have not been categorized in the fair value hierarchy. The fair value amounts presented in the tables above are intended to permit reconciliation of the fair value hierarchy to the total fair value of plan assets. We have concluded that the NAV reported by the underlying fund approximates the fair value of the investment. These investments are redeemable at NAV under agreements with the underlying funds. However, it is possible that these redemption rights may be restricted or eliminated by the funds in the future in accordance with the underlying fund agreements. Due to the nature of the investments held by the funds, changes in market conditions and the economic environment may significantly impact the NAV of the funds and, consequently, the fair value of the U.S. defined benefit pension plan asset’s interest in the funds. Furthermore, changes to the liquidity provisions of the funds may significantly impact the fair value of the U.S. defined benefit pension plan asset’s interest in the funds. As of December 31, 2022, there were no restrictions on redemption of these investments. The following table sets forth a summary of the RIP’s investments measured at NAV: Value at December 31, 2022 Description Fair Value Unfunded Redemption Redemption Real estate $ 5.6 $ 2.2 Quarterly 60 days Value at December 31, 2021 Description Fair Value Unfunded Redemption Redemption Real estate $ 6.4 $ 2.2 Quarterly 60 days Following is a description of the valuation methodologies used for assets measured at fair value and at NAV. Collective trust funds – bonds: Consists primarily of collective trust funds, in addition to registered investment funds and common trust funds, which invest in fixed income securities tailored to institutional investors. There are no readily available market quotations for registered investment company funds. The fair value of collective trust funds, registered investment funds and common trust funds have been classified as Level 2 assets above based on the determination that the funds have quoted prices in non-active markets. The funds are priced on a daily basis by their trustee and therefore have a readily determinable fair value; however, the number of trades occurring is not sufficient for the market to be considered active. Investments in pooled funds traded in a non-active market were valued at bid price and classified as Level 2 assets above. Collective trust funds – equities: Represents collective trust and funds holding equity investments, fixed income securities, commodity futures contracts, cash and other short-term securities. The fair value of collective trust funds have been classified as Level 2 assets above based on the determination that the funds have quoted prices in non-active markets. The funds are priced on a daily basis by their trustee and therefore have a readily determinable fair value; however, the number of trades occurring is not sufficient for the market to be considered active. Cash, other short-term investments and payables : Consists primarily of cash and cash equivalents, and plan receivables/payables. The carrying amounts of cash and cash equivalents and receivables/payables approximate fair value due to the short-term nature of these instruments. Other payables and receivables consist primarily of accrued fees and receivables related to investment positions liquidated for which proceeds had not been received as of December 31. Real estate: Consists of both open-end and closed-end real estate funds. There are no readily available market quotations for these real estate funds. These investments were measured at fair value using the NAV practical expedient. DEFINED BENEFIT RETIREE HEALTH AND LIFE INSURANCE PLANS We fund postretirement benefits on a pay-as-you-go basis, with the retiree paying a portion of the cost for health care benefits by means of deductibles and contributions. The following tables summarize the balance sheet impact of the postretirement benefit pension plan, as well as the related benefit obligations, funded status and rate assumptions. We use a December 31 measurement date for all our defined benefit postretirement benefit plans. 2022 2021 Change in benefit obligations: Benefit obligation as of beginning of period $ 78.0 $ 81.4 Interest cost 1.5 1.2 Plan participants' contributions 1.6 1.9 Actuarial (gain) loss ( 12.4 ) 2.0 Benefits paid ( 6.8 ) ( 8.5 ) Benefit obligations as of end of period $ 61.9 $ 78.0 2022 2021 Change in plan assets: Fair value of plan assets as of beginning of period $ - $ - Employer contributions 5.2 6.6 Plan participants' contributions 1.6 1.9 Benefits paid ( 6.8 ) ( 8.5 ) Fair value of plan assets as of end of period $ - $ - Funded status $ ( 61.9 ) $ ( 78.0 ) 2022 2021 Weighted-average discount rate used to determine benefit obligations at end of period 5.12 % 2.72 % Weighted-average discount rate used to determine net periodic benefit cost for the period 2.73 % 2.35 % In 2022, the largest contributor to the actuarial gains affecting the benefit obligations for the postretirement plans was an increase in the discount rate, which was partially offset by an update to the per capita claims assumption. In 2021, the largest contributor to the actuarial losses affecting the benefit obligations for the postretirement plans was the update to the per capita claims assumption, which was partially offset by an increase in the discount rate. The components of postretirement benefit (credit) are as follows: 2022 2021 2020 Interest cost on accumulated postretirement benefit obligation $ 1.5 $ 1.2 $ 1.9 Amortization of prior service (credit) ( 0.3 ) ( 0.3 ) ( 0.3 ) Amortization of net actuarial gain ( 2.8 ) ( 2.2 ) ( 6.6 ) Net periodic postretirement benefit (credit) $ ( 1.6 ) $ ( 1.3 ) $ ( 5.0 ) For measurement purposes, an average rate of annual increase in the per capita cost of covered health care benefits of 7.3 % for pre-65 retirees and 7.8 % for post-65 retirees was assumed for 2022, decreasing ratably to an ultimate rate of 4.5 % in 2030. Amounts recognized in assets (liabilities) on the consolidated balance sheets at year end consist of: U.S. Pension Plans Non-U.S. Pension Plan Retiree Health and Life 2022 2021 2022 2021 2022 2021 Prepaid pension costs $ 83.2 $ 109.0 $ - $ - $ - $ - Accounts payable and accrued expenses ( 2.7 ) ( 2.9 ) ( 0.1 ) ( 0.1 ) ( 7.1 ) ( 6.9 ) Postretirement benefit liabilities - - - - ( 54.8 ) ( 71.1 ) Pension benefit liabilities ( 25.9 ) ( 34.5 ) ( 1.7 ) ( 2.4 ) - - Net amount recognized $ 54.6 $ 71.6 $ ( 1.8 ) $ ( 2.5 ) $ ( 61.9 ) $ ( 78.0 ) Pre-tax amounts recognized in accumulated other comprehensive (loss) income at year end consist of: U.S. Pension Plans Retiree Health and Life 2022 2021 2022 2021 Net actuarial (loss) gain $ ( 171.9 ) $ ( 152.1 ) $ 23.3 $ 13.7 Prior service credit - - 1.2 1.4 Accumulated other comprehensive (loss) $ ( 171.9 ) $ ( 152.1 ) $ 24.5 $ 15.1 The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid over the next ten years for our U.S. plans: U.S. Pension (1) Retiree Health 2023 $ 17.0 $ 7.0 2024 18.5 6.7 2025 20.4 6.5 2026 21.6 6.0 2027 22.9 5.6 2028 - 2032 121.2 23.0 (1) We were not required and did not make contributions to the RIP during 2022, 2021 or 2020 as, based on guidelines established by the Pension Benefit Guaranty Corporation, the RIP had sufficient assets to fund its distribution obligations. Benefit payments to RIP participants have been made directly from the RIP while benefit payments under the RBEP are made from Company cash.

Financial Instruments and Conti

Financial Instruments and Contingent Consideration	12 Months Ended
Financial Instruments and Contingent Consideration	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Financial Instruments and Contingent Consideration	NOTE 19. FINANCIAL INSTRUMENTS AND CONTINGENT CONSIDERATION We do not hold or issue financial instruments for trading purposes. The estimated fair values of our financial instruments and contingent consideration are as follows: December 31, 2022 December 31, 2021 Carrying Estimated Carrying Estimated Assets (liabilities), net: Total long-term debt, including current portion $ ( 651.1 ) $ ( 645.3 ) $ ( 631.4 ) $ ( 626.0 ) Interest rate swap contracts 11.4 11.4 ( 14.2 ) ( 14.2 ) Acquisition-related contingent consideration ( 15.2 ) ( 15.2 ) ( 12.8 ) ( 12.8 ) The carrying amounts of cash and cash equivalents, receivables, accounts payable, and accrued expenses approximate fair value because of the short-term maturity of these instruments. The fair value estimates of long-term debt are based on quotes from a major financial institution of recently observed trading levels of our Term Loan A debt. The fair value estimates for interest rate swap contracts are estimated by obtaining quotes from major financial institutions with verification by internal valuation models. We engaged independent, third-party valuation specialists to determine the fair value estimates for acquisition-related contingent consideration payable based on performance, which were measured using a Monte Carlo simulation. As of December 31, 2022 and 2021, $ 15.2 million and $ 8.6 million, respectively, of the carrying amount of contingent consideration liabilities payable, related to final achievement of certain financial and performance milestones through December 31, 2022 and 2021, respectively, for the acquisitions of Moz and Turf, was equal to fair value as milestone achievements were known. The fair value measurement of assets and liabilities measured at fair value on a recurring basis and reported on the Consolidated Balance Sheets is summarized below: December 31, 2022 December 31, 2021 Fair value based on Fair value based on Other Other Other Level 2 Level 2 Level 3 Assets (liabilities), net: Interest rate swap contracts $ 11.4 $ ( 14.2 ) $ - Acquisition-related contingent consideration - - ( 4.2 ) As of December 31, 2021, the acquisition-related contingent consideration liability included $ 8.6 million related to the final achievement of certain financial and performance milestones through December 31, 2021, for the Moz and Turf acquisitions, which was paid in the first quarter 2022. Acquisition-related contingent consideration of $ 4.2 million as of December 31, 2021 was measured with the use of significant unobservable inputs, which included financial projections over the earn-out period, the volatility of the underlying financial metrics and estimated discount rates. All changes in the contingent consideration liability subsequent to the initial acquisition-date measurements were recorded as a component of operating income on our Consolidated Statements of Operations and Comprehensive Income. The following table summarizes the weighted-average of the significant unobservable inputs as of December 31, 2021: Turf Unobservable input Volatility 22.2 % Discount rates 2.7 % The changes in fair value of the acquisition-related contingent consideration liability for the years ended December 31, 2022, 2021 and 2020 were as follows: Fair Value of Contingent Consideration Balance as of January 1, 2020 $ - Acquisition date fair value of Moz contingent consideration 2.7 Acquisition date fair value of Turf contingent consideration 14.1 Loss related to change in fair value of contingent consideration 0.1 Balance as of December 31, 2020 $ 16.9 (Gain) related to change in fair value of contingent consideration ( 4.1 ) Balance as of December 31, 2021 $ 12.8 Cash consideration paid ( 8.6 ) Loss related to change in fair value of contingent consideration 11.0 Balance as of December 31, 2022 $ 15.2 As of December 31, 2022, the acquisition-related contingent consideration liability represents the additional cash consideration payable related to our acquisition of Turf upon the final achievement of certain financial and performance milestones through December 31, 2022, which we paid in the first quarter of 2023 and is classified as a current liability. During 2022, the change in fair value was due to changes in Turf actual results over the earn out period. During 2021 and 2020, the change in fair value was primarily due to changes in Turf and Moz actual results or financial projections over the earn out period. During 2022, we paid $ 8.6 million of additional cash consideration, which represented the final achievement of certain financial and performance milestones through December 31, 2021 for the acquisitions of Moz and Turf. The additional cash consideration paid was classified as cash flows from financing activities in our Consolidated Statements of Cash Flows, up to the acquisition date fair value. The portions of additional cash consideration paid in excess of the acquisition date fair value was classified as cash flows from operating activities in our Consolidated Statements of Cash Flows.

Derivative Financial Instrument

Derivative Financial Instruments	12 Months Ended
Derivative Financial Instruments	Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	NOTE 20. DERIVATIVE FINANCIAL INSTRUMENTS We are exposed to market risk from changes in foreign exchange rates, interest rates and commodity prices that could impact our results of operations, cash flows and financial condition. We use interest rate derivatives to manage our exposures to interest rates. At inception, interest rate swap derivatives that we designate as hedging instruments are formally documented as a hedge of a forecasted transaction or cash flow hedge. We also formally assess, both at inception and at least quarterly thereafter, whether the derivatives that are used in hedging transactions are highly effective in offsetting changes in the cash flows of the hedged item. If it is determined that a derivative ceases to be a highly effective hedge, or if the anticipated transaction is no longer probable of occurring, we discontinue hedge accounting and any future mark-to-market adjustments are recognized in earnings. We use derivative financial instruments as risk management tools and not for speculative trading purposes. Counterparty Risk We only enter into derivative transactions with established financial institution counterparties having an investment-grade credit rating. We monitor counterparty credit ratings on a regular basis. All of our derivative transactions with counterparties are governed by master International Swap and Derivatives Association agreements (“ISDAs”) with netting arrangements. These agreements can limit our exposure in situations where we have gain and loss positions outstanding with a single counterparty. We do not post nor do we receive cash collateral with any counterparty for our derivative transactions. These ISDAs do not have any credit contingent features; however, a default under our bank credit facility would trigger a default under these agreements. Exposure to individual counterparties is controlled and we consider the risk of counterparty default to be negligible. Interest Rate Risk We utilize interest rate swaps to minimize the fluctuations in earnings caused by interest rate volatility. These swaps are designated as cash flow hedges against changes in LIBOR for a portion of our variable rate debt. Effective the second quarter 2020, we adopted Accounting Standards Update 2020-04, “Facilitation of the Effects of Reference Rate Reform on Financial Reporting,” which provides optional expedients and exceptions for applying U.S. GAAP to contracts, hedging relationships and other transactions affected by the discontinuation of LIBOR. In December 2022, we amended and restated our senior secured credit facility. We have elected practical expedients available under Accounting Standards Update 2020-04 to allow for different reference rates in our senior secured credit facility and interest rate hedges. The following table summarizes our interest rate swaps as of December 31, 2022: Trade Date Notional Amount Coverage Period Risk Coverage November 28, 2018 $ 200.0 November 2018 to November 2023 USD-LIBOR September 19, 2022 $ 25.0 September 2022 to December 2023 USD-LIBOR March 10, 2020 $ 50.0 March 2021 to March 2024 USD-LIBOR March 11, 2020 $ 50.0 March 2021 to March 2024 USD-LIBOR November 28, 2018 $ 100.0 March 2021 to March 2025 USD-LIBOR Under the terms of our interest rate swaps above, we pay a fixed rate monthly and receive 1-month LIBOR, inclusive of a 0 % floor. Financial Statement Impacts The following tables detail amounts related to our derivatives as of December 31, 2022 and 2021. We did not have any derivative assets or liabilities not designated as hedging instruments as of December 31, 2022 or 2021. The derivative asset and liability amounts below are shown gross and have not been netted. Derivative Assets Derivative Liabilities Fair Value Fair Value Balance Sheet December 31, December 31, Balance Sheet December 31, December 31, Interest rate swap contracts Other current assets $ 3.7 $ - Accounts payable and accrued expenses $ - $ 0.1 Interest rate swap contracts Other non-current assets 7.7 0.4 Other long-term liabilities - 14.5 Amount of Gain (Loss) Location of Gain (Loss) Reclassified from Gain Reclassified 2022 2021 2020 2022 2021 2020 Derivatives in cash flow hedging relationships Interest rate swap contracts $ 26.9 $ 21.9 $ ( 8.6 ) Interest expense $ 2.0 $ 8.5 $ 5.6 As of December 31, 2022, the amount of existing gains in AOCI expected to be recognized in earnings over the next twelve months was $ 10.4 million.

Other Long-Term Liabilities

Other Long-Term Liabilities	12 Months Ended
Other Long-Term Liabilities	Dec. 31, 2022
Other Liabilities Disclosure [Abstract]
Other Long-Term Liabilities	NOTE 21. OTHER LONG-TERM LIABILITIES December 31, 2022 December 31, 2021 Long-term deferred compensation arrangements $ 15.4 $ 17.6 Fair value of derivative liabilities - 14.5 Environmental insurance recoveries received in excess of cumulative expenses incurred 3.5 4.8 Acquisition-related contingent consideration - 4.2 Other 6.9 5.6 Total other long-term liabilities $ 25.8 $ 46.7

Share-Based Compensation Plans

Share-Based Compensation Plans	12 Months Ended
Share-Based Compensation Plans	Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]
Share-Based Compensation Plans	NOTE 22. SHARE-BASED COMPENSATION PLANS The 2016 Long-Term Incentive Plan (“2016 LTIP”) authorized us to issue stock options, stock appreciation rights, restricted stock awards, stock units, performance-based awards and cash awards to officers and key employees and was scheduled to terminate on July 8, 2026 . On June 16, 2022, our shareholders approved the 2022 Equity and Cash Incentive Plan (“2022 ECIP”), which is the successor to the 2016 LTIP. We cannot issue any additional shares under the 2016 LTIP. The 2022 ECIP authorizes us to issue stock options, stock appreciation rights, restricted stock awards, performance-based awards and cash awards to officers and key employees. The 2022 ECIP authorizes us to issue up to 2,651,472 shares of common stock, which includes all shares that have been issued under the 2022 ECIP and the 2016 LTIP. The expiration of the 2022 ECIP is June 15, 2032 , after which time no further awards may be made. A s of December 31, 2022, 2,636,996 shares were available for future grants under the 2022 ECIP, which includes anticipated future adjustments to shares for performance-based awards that have been previously granted. The 2016 Directors Stock Unit Plan (“2016 Director’s Plan”) authorizes us to issue stock units to non-employee directors until July 2026 . The 2016 Director’s Plan authorizes us to issue up to 250,000 shares of common stock, which includes all shares that have been issued under the 2016 Director’s Plan. As of December 31, 2022, 145,437 shares were available for future grants under the 2016 Director’s Plan. The 2020 Inducement Award Plan (“2020 Inducement Plan”) authorizes us to issue stock options, stock appreciation rights, restricted stock awards and stock units to key employees and expires on December 14, 2030 , after which time no further awards may be made. The 2020 Inducement Plan authorizes us to issue up to 19,000 shares of common stock. As of December 31, 2022, 6,921 shares were available for future grants under the 2020 Inducement Plan. The following table presents stock option activity for the year ended December 31, 2022: Number of shares (thousands) Weighted-average exercise price Weighted-average remaining contractual term (years) Aggregate intrinsic value Option shares outstanding, December 31, 2021 73.5 $ 46.05 Option shares exercised ( 39.6 ) $ 44.93 Option shares outstanding, December 31, 2022 33.9 $ 47.35 1.1 $ 0.7 Option shares exercisable, vested and expected to vest, 33.9 $ 47.35 1.1 $ 0.7 We have reserved sufficient authorized shares to allow us to issue new shares upon exercise of all outstanding options. Options generally become exercisable in three years and expire 10 years from the date of grant. When options are exercised, we may issue new shares, use treasury shares (if available), acquire shares held by investors, or a combination of these alternatives in order to satisfy the option exercises. The following table presents information related to stock option exercises: 2022 2021 2020 Total intrinsic value of stock options exercised $ 1.3 $ 4.1 $ 5.6 Cash proceeds received from stock options exercised 1.8 2.5 4.7 Tax deduction realized from stock options exercised 0.1 0.4 1.2 The fair value of option grants was estimated on the date of grant using the Black-Scholes option pricing model. There have been no option grants since 2014. We also grant non-vested stock awards in the form of Restricted Stock Units (“RSUs”), Performance Stock Units (“PSUs”) and Restricted Stock Awards ("RSAs"). A summary of the 2022 activity related to the RSUs, PSUs and RSAs is as follows: Non-Vested Stock Awards RSUs PSUs RSAs Number of shares (thousands) Weighted- Number of shares (thousands) Weighted- Number of shares (thousands) Weighted- December 31, 2021 65.0 $ 87.94 301.8 $ 92.74 72.6 $ 77.99 Granted 77.3 86.98 118.2 96.67 - - Performance adjustments - - ( 27.5 ) ( 71.84 ) - - Vested ( 24.1 ) ( 90.32 ) ( 74.4 ) ( 77.80 ) ( 20.4 ) ( 77.90 ) Forfeited ( 6.1 ) ( 87.60 ) ( 11.7 ) ( 102.92 ) ( 1.5 ) ( 77.22 ) December 31, 2022 112.1 $ 86.66 306.4 $ 99.38 50.7 $ 78.05 RSUs entitle the recipient to a specified number of shares of AWI’s common stock provided the prescribed service period is fulfilled. PSUs entitle the recipient to a specified number of shares of AWI’s common stock provided the defined financial targets are achieved at the end of the performance period. Upon vesting, final adjustments based upon financial achievements are reflected as performance adjustments in the table above. RSUs and PSUs generally have vesting periods of three years at the grant date. RSUs and PSUs earn dividends during the vesting period that are subject to forfeiture if the awards do not vest. In connection with the acquisition of Arktura in 2020, we issued RSAs to the sellers as of the acquisition date. These awards to sellers were not issued under the 2020 Inducement Plan and have a vesting period of five years from the grant date and earn dividends during the vesting period, which are subject to forfeiture if the awards do not vest. We also issued RSAs under the 2020 Inducement Plan to key employees as of the acquisition date, which have a vesting period of three years from the grant date and earn dividends during the vesting period, which are subject to forfeiture if the awards do not vest. Upon forfeiture, the key employee awards transfer to the Arktura sellers. As of December 31, 2022, 1,915 RSAs forfeited by key employees have been transferred to the Arktura sellers and are not included in the table above. RSUs, PSUs and RSAs with non-market based performance conditions are measured at fair value based on the closing price of our stock on the date of grant. In 2022 and 2021, we granted 57,439 and 54,231 PSUs, respectively, with market-based performance conditions that are valued through the use of a Monte Carlo simulation. The weighted average assumptions for PSUs measured at fair value through the use of a Monte Carlo simulation are presented in the table below. 2022 2021 Weighted-average grant date fair value of market-based PSUs granted (dollars per award) $ 104.92 $ 117.85 Assumptions Risk-free rate of return 1.8 % 0.3 % Expected volatility 37.0 % 37.0 % Expected term (in years) 3.1 3.1 Expected dividend yield 0.0 % 0.0 % The risk-free rate of return was determined based on the implied yield available on zero coupon U.S. Treasury bills at the time of grant with a remaining term equal to the expected term of the PSUs. The expected volatility was based on historical volatility of our stock price commensurate with the expected term of the PSUs. The expected term represented the performance period on the underlying award. The expected dividend yield was assumed to be zero under the assumption that dividends distributed during the performance period are reinvested in AWI’s common stock. In addition to the equity awards described above, we distributed 11,773 fully-vested phantom shares issued under the 2006 Phantom Stock Unit Plan in 2020. These awards are settled in cash and had vesting periods of one to three years . The total liability recorded for these shares as of December 31, 2020 was $ 1.2 million, which included non-forfeitable dividends. This liability was settled on January 5, 2021 and there are no shares outstanding under the plan as of December 31, 2022 and 2021. The 2006 Phantom Stock Unit Plan is still in place, however, no additional shares will be granted under the plan. As of December 31, 2022 and 2021 , there were 80,890 and 130,393 RSUs, respectively, outstanding under the 2016 Directors Stock Unit Plan not reflected in the non-vested stock awards table above. In 2022 and 2021, we granted 13,467 and 8,314 restricted stock units, respectively, to non-employee directors. These awards generally have a vesting period of one year , and as of December 31, 2022 and 2021, 67,423 and 122,079 shares, respectively, were vested but not yet delivered. The awards are generally payable upon vesting or the director’s deferral election. These awards earn dividends during the vesting period that are subject to forfeiture if the underlying award does not vest. We recognize share-based compensation expense on a straight-line basis over the vesting period. Share-based compensation cost was $ 14.3 million ($ 10.8 million net of tax benefit) in 2022, $ 11.3 million ($ 8.5 million net of tax benefit) in 2021, and $ 6.9 million ($ 5.1 million net of tax benefit) in 2020. As of December 31, 2022, there was $ 18.7 million of total unrecognized compensation cost related to non-vested share-based compensation arrangements which is expected to be recognized over a weighted-average period of 1.9 years.

Employee Costs

Employee Costs	12 Months Ended
Employee Costs	Dec. 31, 2022
Compensation Related Costs [Abstract]
Employee Costs	NOTE 23. EMPLOYEE COSTS 2022 2021 2020 Wages, salaries and incentive compensation $ 259.7 $ 259.9 $ 207.6 Payroll taxes 18.3 13.4 15.6 Defined contribution and defined benefit pension plan expense, net 8.5 10.0 1.0 Insurance and other benefit costs 29.9 28.2 25.1 Share-based compensation 14.3 11.3 6.9 Total $ 330.7 $ 322.8 $ 256.2

Shareholders' Equity

Shareholders' Equity	12 Months Ended
Shareholders' Equity	Dec. 31, 2022
Stockholders' Equity Note [Abstract]
Shareholders' Equity	NOTE 24. SHAREHOLDERS' EQUITY Common Stock Repurchase Plan On July 29, 2016, our Board of Directors approved our share repurchase program pursuant to which we are authorized to repurchase up to $ 1,200.0 million of our outstanding shares of common stock through December 31, 2023 (the “Program”). We had $ 348.8 million remaining under the Board’s repurchase authorization as of December 31, 2022. Repurchases under the Program may be made through open market, block and privately negotiated transactions, including Rule 10b5-1 plans, at such times and in such amounts as management deems appropriate, subject to market and business conditions, regulatory requirements and other factors. The Program does not obligate AWI to repurchase any particular amount of common stock and may be suspended or discontinued at any time without notice. During 2022, we repurchased 1.9 million shares under the Program for a total cost of $ 165.0 million, excluding commissions, or an average price of $ 87.31 per share. Since inception, we have repurchased 12.4 million shares under the Program for a total cost of $ 851.2 million, excluding commissions, or an average price of $ 68.66 per share. Dividends In February, April and July 2022, our Board of Directors declared $ 0.231 per share quarterly dividends, which were paid to shareholders in March , May and August 2022 . In October 2022, our Board of Directors declared a $ 0.254 per share quarterly dividend, which was paid to shareholders in November 2022 . On February 14, 2023, our Board of Directors declared a $ 0.254 per share quarterly dividend to be paid in March 2023 . Accumulated Other Comprehensive (Loss) The balance of each component of accumulated other comprehensive (loss), net of tax is presented in the table below. December 31, 2022 December 31, 2021 Foreign currency translation adjustments $ 0.5 $ 2.3 Derivative gain (loss), net 9.5 ( 9.1 ) Pension and postretirement adjustments ( 110.1 ) ( 102.8 ) Accumulated other comprehensive (loss) $ ( 100.1 ) $ ( 109.6 ) The amounts and related tax effects allocated to each component of other comprehensive income (loss) for 2022, 2021, and 2020 are presented in the tables below. Pre-tax Amount Tax (Expense) Benefit After-tax Amount 2022 Foreign currency translation adjustments $ ( 1.8 ) $ - $ ( 1.8 ) Derivative gain, net 24.9 ( 6.3 ) 18.6 Pension and postretirement adjustments ( 9.6 ) 2.3 ( 7.3 ) Total other comprehensive income (loss) $ 13.5 $ ( 4.0 ) $ 9.5 Pre-tax Amount Tax (Expense) Benefit After-tax Amount 2021 Derivative gain, net $ 13.4 $ ( 3.5 ) $ 9.9 Pension and postretirement adjustments ( 13.4 ) 3.2 ( 10.2 ) Total other comprehensive (loss) $ - $ ( 0.3 ) $ ( 0.3 ) Pre-tax Amount Tax Benefit (Expense) After-tax Amount 2020 Foreign currency translation adjustments $ ( 7.1 ) $ - $ ( 7.1 ) Derivative (loss), net ( 14.2 ) 3.7 ( 10.5 ) Pension and postretirement adjustments 382.9 ( 98.5 ) 284.4 Total other comprehensive income (loss) $ 361.6 $ ( 94.8 ) $ 266.8 The following table summarizes the activity, by component, related to the change in AOCI for December 31, 2022 and 2021: Foreign Derivative (1) Pension and Postretirement Adjustments (1) Total (1) Balance, December 31, 2020 $ 2.3 $ ( 19.0 ) $ ( 92.6 ) $ ( 109.3 ) Other comprehensive income (loss) before reclassifications, 5.4 ), $ 3.5 and ($ 1.9 ) - 16.5 ( 11.0 ) 5.5 Amounts reclassified from accumulated other - ( 6.6 ) 0.8 ( 5.8 ) Net current period other comprehensive income (loss) - 9.9 ( 10.2 ) ( 0.3 ) Balance, December 31, 2021 2.3 ( 9.1 ) ( 102.8 ) ( 109.6 ) Other comprehensive (loss) income before reclassifications, 6.7 ), $ 2.6 and ($ 4.1 ) ( 1.8 ) 20.2 ( 8.1 ) 10.3 Amounts reclassified from accumulated other - ( 1.6 ) 0.8 ( 0.8 ) Net current period other comprehensive (loss) income ( 1.8 ) 18.6 ( 7.3 ) 9.5 Balance, December 31, 2022 $ 0.5 $ 9.5 $ ( 110.1 ) $ ( 100.1 ) (1) Amounts are net of tax The amounts reclassified from AOCI and the affected line item of the Consolidated Statements of Operations and Comprehensive Income are presented in the table below. Amounts Affected Line Item in the 2022 2021 Derivative Adjustments: Interest rate swap contracts, before tax $ ( 2.0 ) $ ( 8.5 ) Interest expense Tax impact 0.4 1.9 Income tax expense (benefit) Total (income), net of tax ( 1.6 ) ( 6.6 ) Pension and Postretirement Adjustments: Prior service credit amortization ( 0.3 ) ( 0.3 ) Other non-operating (income) expense, net Amortization of net actuarial loss 1.4 1.4 Other non-operating (income) expense, net Total loss, before tax 1.1 1.1 Tax impact ( 0.3 ) ( 0.3 ) Income tax expense (benefit) Total loss, net of tax 0.8 0.8 Total reclassifications for the period $ ( 0.8 ) $ ( 5.8 )

Supplemental Financial Informat

Supplemental Financial Information	12 Months Ended
Supplemental Financial Information	Dec. 31, 2022
Supplemental Financial Information [Abstract]
Supplemental Financial Information	NOTE 25. SUPPLEMENTAL FINANCIAL INFORMATION 2022 2021 2020 Selected operating expense Maintenance and repair costs $ 42.7 $ 41.9 $ 38.1 Product innovation costs 14.9 14.6 14.7 Advertising costs 9.2 8.0 6.8 Other non-operating (income) expense, net Interest income $ ( 0.5 ) $ ( 0.1 ) $ ( 0.3 ) Pension and postretirement (credits) cost ( 5.3 ) ( 5.3 ) 358.7 Other ( 0.2 ) ( 0.2 ) ( 1.0 ) Total $ ( 6.0 ) $ ( 5.6 ) $ 357.4

Related Parties

Related Parties	12 Months Ended
Related Parties	Dec. 31, 2022
Related Party Transactions [Abstract]
Related Parties	NOTE 26. RELATED PARTIES For some customers, we purchase grid products from WAVE, our 50 % -owned joint venture with Worthington, for resale to customers. The total amount of these purchases was $ 34.5 million in 2022, $ 27.9 million in 2021 and $ 21.5 million in 2020. We also provide certain selling, promotional and administrative processing services to WAVE for which we receive reimbursement. Those services amounted to $ 29.1 million in 2022, $ 21.6 million in 2021, and $ 20.7 million in 2020. The net amount due to WAVE from us for all of our relationships was $ 5.3 million as of December 31, 2022 and $ 4.3 million as of December 31, 2021 . See Note 11 to the Consolidated Financial Statements for additional information.

Litigation and Related Matters

Litigation and Related Matters	12 Months Ended
Litigation and Related Matters	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Litigation and Related Matters	NOTE 27. LITIGATION AND RELATED MATTERS ENVIRONMENTAL MATTERS Environmental Compliance Our manufacturing and research facilities are affected by various federal, state and local requirements relating to the discharge of materials and the protection of the environment. We make expenditures necessary for compliance with applicable environmental requirements at each of our operating facilities. While these expenditures are not typically material, the applicable regulatory requirements continually change and, as a result, we cannot predict with certainty the amount, nature or timing of future expenditures associated with environmental compliance. Environmental Sites Summary We are actively involved in the investigation and remediation of existing or potential environmental contamination under the Comprehensive Environmental Response, Compensation and Liability Act (“CERCLA”) and state Superfund and similar environmental laws at two domestically owned locations allegedly resulting from past industrial activity. In each location, we are one of multiple potentially responsible parties and have agreed to jointly fund the required investigation and remediation, while preserving our defenses to the liability. We may also have rights of contribution or reimbursement from other parties or coverage under applicable insurance policies. We have pursued coverage and recoveries under those applicable insurance policies with respect to certain of the sites, including the Macon, GA site and the Elizabeth City, NC site, each of which is summarized below. Other than disclosed below, we are unable to predict the outcome of these matters or the timing of any future recoveries, whether through settlement or otherwise. We are also unable to predict the extent to which any recoveries might cover our final share of investigation and remediation costs for these sites. Our final share of investigation and remediation costs may exceed any such recoveries, and such amounts net of insurance recoveries may be material. Between 2017 and 2021, we entered settlement agreements totaling $ 53.0 million with certain legacy insurance carriers to resolve ongoing litigation and recover fees and costs previously incurred by us in connection with certain environmental sites. These settlements were initially recorded as reductions to cost of goods sold and SG&A expenses, reflecting the same income statement categories where environmental expenditures were historically recorded. Beginning in 2020, cumulative insurance recoveries exceeded cumulative expenses to date related to the respective environmental sites and the excess was recorded within long-term liabilities on our Consolidated Balance Sheets. As of December 31, 2022 and 2021, insurance recoveries in excess of cumulative expenses were $ 3.5 million and $ 4.8 million, respectively. The excess recoveries will be released to offset any future expenses, including additional reserves for potential liabilities, incurred on the respective environmental sites. We may enter into additional settlement agreements in the future, which may or may not be material, with other legacy insurers to obtain reimbursement or contribution for environmental site expenses. Estimates of our future liability at the environmental sites are based on evaluations of currently available facts regarding each individual site. We consider factors such as our activities associated with the site, existing technology, presently enacted laws and regulations and prior company experience in remediating contaminated sites. Although current law imposes joint and several liability on all parties at Superfund sites, our contribution to the remediation of these sites is expected to be limited by the number of other companies potentially liable for site remediation. As a result, our estimated liability reflects only our expected share. In determining the probability of contribution, we consider the solvency of other parties, the site activities of other parties, whether liability is being disputed, the terms of any existing agreements and experience with similar matters, and the effect of our October 2006 Chapter 11 reorganization upon the validity of the claim, if any. Specific Material Events Macon, GA The U.S. Environmental Protection Agency (the “EPA”) has listed two landfills located on a portion of our facility in Macon, GA, along with the former Macon Naval Ordnance Plant landfill adjacent to our property, portions of Rocky Creek, and certain tributaries leading to Rocky Creek (collectively, the “Macon Site”) as a Superfund site on the National Priorities List due to the presence of contaminants, most notably polychlorinated biphenyls (“PCBs”). In September 2010, we entered into an Administrative Order on Consent for a Removal Action (the “Removal Action”) with the EPA to investigate PCB contamination in one of the landfills on our property, the Wastewater Treatment Plant Landfill (“Operable Unit 1”). After completing an investigation of Operable Unit 1 and submitting our final Engineering Evaluation/Cost Analysis, the EPA issued an Action Memorandum in July 2013 selecting our recommended remedy for the Removal Action. The Operable Unit 1 response action is complete and the final report was submitted to the EPA in October 2016 . The EPA approved the final report in November 2016, and a Post-Removal Control Plan was submitted to the EPA in March 2017. It is probable that we will incur field investigation, engineering and oversight costs associated with a Remedial Investigation and Feasibility Study (“RI/FS”) with respect to the remainder of the Superfund site, which includes the other landfill on our property, as well as areas on and adjacent to our property and Rocky Creek (“Operable Unit 2”). In September 2015, AWI and other Potential Responsible Parties (“PRPs”) received a Special Notice Letter from the EPA under CERCLA inviting AWI and the PRPs to enter into the negotiation of an agreement to conduct an RI/FS of Operable Unit 2. We and the other PRPs entered into a settlement agreement with the EPA effective September 2018, in response to the Special Notice Letter to conduct the RI/FS. The PRPs submitted a complete RI/FS work plan, which was approved by the EPA in September 2019. Investigative work on this portion of the site commenced in December 2019. In June 2021, the PRPs submitted the Site Characterization Summary Report (SCSR) for Operable Unit 2 to the EPA. The purpose of the SCSR is to demonstrate that the available data for Operable Unit 2 is adequate for the risk assessment and for the development of remedial action objectives. In August 2022, the PRPs submitted to the EPA a Human Health Baseline Risk Assessment, and in December 2022, the PRPs submitted to the EPA a final Baseline Ecological Risk Assessment for Operable Unit 2. Both risk assessments will be exhibits to the draft Remedial Investigation Report, which the PRPs are currently working on, while they evaluate any additional investigation work needed to complete the RI/FS. We may ultimately incur costs in remediating any contamination discovered during the RI/FS. The current estimate of future liability at this site includes only our estimated share of the costs of the investigative work that the EPA is requiring the PRPs to perform at this time. We are unable to reasonably estimate our final share of the total costs associated with the investigation work or any resulting remediation therefrom, although such amounts may be material to any one quarter's or year's results of operations in the future. We do not expect the total future costs to have a material adverse effect on our liquidity or financial condition as the cash payments may be made over many years. Elizabeth City, NC This site is a former cabinet manufacturing facility that from 1977 until 1996 was operated by Triangle Pacific Corporation, now known as Armstrong Wood Products, Inc. (“AWP”). The site was formerly owned by the U.S. Navy (“Navy”) and Westinghouse, which was purchased by Paramount Global (“Paramount”) (then known as CBS Corporation). We assumed ownership of the site when we acquired the stock of AWP in 1998. Prior to our acquisition, the North Carolina Department of Environment and Natural Resources listed the site as a hazardous waste site. In 1997, AWP entered into a cost sharing agreement with Westinghouse whereby the parties agreed to share equally in costs associated with investigation and potential remediation. In 2000, AWP and Paramount entered into an Administrative Order on Consent to conduct an RI/FS with the EPA for the site. In 2007, we and Paramount entered into an agreement with the Navy whereby the Navy agreed to pay one third of defined past and future investigative costs up to a certain amount, which has now been exhausted. The EPA approved the RI/FS work plan in August 2011. In January 2014, we submitted draft Remedial Investigation and Risk Assessment reports and conducted supplemental investigative work based upon agency comments to those reports. In connection with the separation of Armstrong Flooring, Inc. in 2016, we agreed to retain any legacy environmental liabilities associated with the AWP site. The EPA published an Interim Action Proposed Plan for the site in April 2018 seeking public comment until June 2018. The EPA evaluated comments, including ours, and has published its Interim Record Of Decision ("IROD") selecting an interim cleanup approach. In September 2018, AWI and Paramount received a Special Notice Letter from the EPA under CERCLA inviting AWI and Paramount to enter into the negotiation of a settlement agreement to conduct or finance the response action at the site. In response to the September 2018 Special Notice Letter, we and Paramount submitted a good faith offer to the EPA in May 2019. In June 2021, we entered into a negotiated Partial Consent Decree and Site Participation Agreement with the EPA, Paramount and the United States on behalf of the Navy for the remedial design and remedial action for the interim remedy. Because the United States does not conduct work as a PRP at Superfund sites, similar to the 2007 agreement, the United States agreed to pay its share of the estimated costs of performing the work. The Partial Consent Decree was entered by the U.S. District Court for the Eastern District of North Carolina in January 2022. A Remedial Design Work Plan for the site was submitted to the EPA in June 2022, and AWI and Paramount responded on November 2022 to comments received from the EPA in September 2022. The current estimate of future liability at this site includes only our estimated share of the costs of the interim remedial action that, at this time, we anticipate the EPA will require the PRPs to perform. We are unable to reasonably estimate our final share of the total costs associated with the interim or final remediation at the site, although such amounts may be material to any one quarter’s or year’s results of operations in the future. We do not expect the total future costs to have a material adverse effect on our liquidity or financial condition as the cash payments may be made over many years. Summary of Financial Position Total liabilities of $ 0.5 million and $ 0.7 million as of December 31, 2022 and 2021, respectively, were recorded for environmental liabilities that we consider probable and for which a reasonable estimate of the probable liability could be made. As of December 31, 2022, $ 0.5 million of environmental liabilities were reflected within other long-term liabilities on the Consolidated Balance Sheets. As of December 31, 2021, $ 0.5 million were reflected within other long-term liabilities, and $ 0.2 million were reflected within accounts payable and accrued expenses on the Consolidated Balance Sheets. During 2022 and 2021, we recorded $ 1.3 million and $ 0.2 million, respectively, of additional reserves for potential environmental liabilities. As noted above, expenses associated with the additional reserves recorded in 2022 and 2021 are offset through the release of a portion of the balance of insurance recoveries in excess of cumulative expenses. Where existing data is sufficient to estimate the liability, that estimate has been used; where only a range of probable liabilities is available and no amount within that range is more likely than any other, the lower end of the range has been used. As assessments and remediation activities progress at each site, these liabilities are reviewed to reflect new information as it becomes available and adjusted to reflect amounts actually incurred and paid. These liabilities are undiscounted. The estimated environmental liabilities above do not take into account any claims for additional recoveries from insurance or third parties. It is our policy to record insurance recoveries as assets in the Consolidated Balance Sheets when realizable. We incur costs to pursue environmental insurance recoveries, which are expensed as incurred. Actual costs to be incurred at identified sites may vary from our estimates. Based on our knowledge of the identified sites, it is not possible to reasonably estimate future costs in excess of amounts already recognized. OTHER CLAIMS From time to time, we are involved in other various lawsuits, claims, investigations and other legal matters that arise in the ordinary course of business, including matters involving our products, intellectual property, relationships with suppliers, relationships with distributors, other customers or end users, relationships with competitors, employees and other matters. In connection with those matters, we may have rights of indemnity, contribution or reimbursement from other parties or coverage under applicable insurance policies. When applicable and appropriate, we will seek indemnity, contribution or reimbursement from other parties and pursue coverage and recoveries under those policies, but are unable to predict the outcome of those demands. While complete assurance cannot be given to the outcome of any proceedings relating to these matters, we do not believe that any current claims, individually or in the aggregate, will have a material adverse effect on our financial condition, liquidity or results of operations.

Earnings Per Share

Earnings Per Share	12 Months Ended
Earnings Per Share	Dec. 31, 2022
Earnings Per Share [Abstract]
Earnings Per Share	NOTE 28. EARNINGS PER SHARE The following table is a reconciliation of earnings (loss) to earnings (loss) attributable to common shares used in our basic and diluted Earnings (Loss) Per Share (“EPS”) calculations for the years ended December 31, 2022, 2021 and 2020. EPS components may not add due to rounding. 2022 2021 2020 Earnings (loss) from continuing operations $ 199.9 $ 185.3 $ ( 84.1 ) (Earnings) allocated to participating vested share awards ( 0.3 ) ( 0.3 ) ( 0.1 ) Earnings (loss) from continuing operations attributable to common shares $ 199.6 $ 185.0 $ ( 84.2 ) The following table is a reconciliation of basic shares outstanding to diluted shares outstanding for the years ended December 31, 2022, 2021 and 2020 (shares in millions): 2022 2021 2020 Basic shares outstanding 46.3 47.6 47.9 Dilutive effect of common stock equivalents 0.1 0.3 - Diluted shares outstanding 46.4 47.9 47.9 Anti-dilutive stock awards excluded from the computation of dilutive EPS for 2022, 2021 and 2020 were 19,134 , 8,548 and 313,003 , respectively. Due to the net loss for the year ended December 31, 2020, all common stock equivalents were considered anti-dilutive.

Schedule II

Schedule II	12 Months Ended
Schedule II	Dec. 31, 2022
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
Schedule II	SCHEDU LE II Armstrong World Industries, Inc., and Subsidiaries Valuation and Qualifying Reserves (amounts in millions) Balance at Additions Deductions Balance 2020 Provision for bad debts $ 0.7 $ 0.9 $ ( 0.2 ) $ 1.4 Provision for discounts 1.4 19.4 ( 19.5 ) 1.3 Provision for warranties 0.2 5.5 ( 4.8 ) 0.9 Provision for inventory obsolescence 0.5 0.1 ( 0.6 ) - 2021 Provision for bad debts $ 1.4 $ 0.4 $ ( 0.8 ) $ 1.0 Provision for discounts 1.3 21.7 ( 21.3 ) 1.7 Provision for warranties 0.9 3.9 ( 4.0 ) 0.8 Provision for inventory obsolescence - 0.3 ( 0.1 ) 0.2 2022 Provision for bad debts $ 1.0 $ 0.1 $ ( 0.7 ) $ 0.4 Provision for discounts 1.7 24.4 ( 24.0 ) 2.1 Provision for warranties 0.8 5.6 ( 5.7 ) 0.7 Provision for inventory obsolescence 0.2 0.2 ( 0.1 ) 0.3

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
Summary of Significant Accounting Policies (Policies)	Dec. 31, 2022
Accounting Policies [Abstract]
Consolidation Policy	Consolidation Policy . The consolidated financial statements and accompanying data in this report include the accounts of AWI and its majority-owned subsidiaries. All significant intercompany transactions have been eliminated from the consolidated financial statements.
Use of Estimates	Use of Estimates . We prepare our financial statements in conformity with U.S. Generally Accepted Accounting Principles (“U.S. GAAP”), which requires management to make estimates and assumptions. These estimates and assumptions affect the reported amounts of assets, liabilities, revenues and expenses. When preparing an estimate, management determines the amount based upon the consideration of relevant internal and external information. Actual results may differ from these estimates.
Revenue Recognition	Revenue Recognition . We recognize revenue upon transfer of control of our products to the customer, which typically occurs upon shipment. Our main performance obligation to our customers is the delivery of products in accordance with purchase orders. Each purchase order confirms the transaction price for the products purchased under the arrangement. Direct sales to building materials distributors, home centers, direct customers and retailers represent the majority of our sales. Our standard sales terms are Free On Board (“FOB”) shipping point. We have some sales terms that are FOB destination. At the point of shipment, the customer is required to pay under normal sales terms. In most cases our normal payment terms are 45 days or less and our sales arrangements do not have any material financing components. In addition, our customer arrangements do not produce contract assets or liabilities that are material to our Consolidated Financial Statements. Within our Architectural Specialties segment, the majority of revenues are customer project driven, which includes a minority of revenues derived from the sale of customer specified customized products that have no alternative use to us. The manufacturing cycle for these custom products is typically short. Incremental costs to fulfill our customer arrangements are expensed as incurred, as the amortization period is less than one year. Our products are sold with normal and customary return provisions. We provide limited warranties for defects in materials or factory workmanship, sagging and warping, and certain other manufacturing defects. Warranties are not sold separately to customers. Our product warranties place certain requirements on the purchaser, including installation and maintenance in accordance with our written instructions. In addition to our warranty program, under certain limited circumstances, we will occasionally at our sole discretion provide a customer accommodation repair or replacement. Warranty repairs and replacements are most commonly made by professional installers employed by or affiliated with our independent distributors. Reimbursement for costs associated with warranty repairs are provided to our independent distributors through a credit against accounts receivable from the distributor to us. Sales returns and warranty claims have historically not been material and do not constitute separate performance obligations. We often offer incentive programs to our customers, primarily volume rebates and promotions. The majority of our rebates are designated as a percentage of annual customer purchases. We estimate the amount of rebates based on actual sales for the period and accrue for the projected incentive programs’ costs. We record the costs of rebate accruals as a reduction to the transaction price. See Note 4 to the Consolidated Financial Statements for additional information related to our revenues.
Shipping and Handling Costs	Shipping and Handling Costs . We account for product shipping and handling costs as fulfillment activities and present the associated costs in costs of goods sold in the period in which we sell our product.
Advertising Costs	Advertising Costs . We recognize advertising expenses as they are incurred.
Research and Development Costs	Research and Development Costs . We expense research and development costs as they are incurred.
Business Combinations	Business Combinations . We account for acquisitions under the acquisition method and the results of acquired operations are included in the Consolidated Financial Statements from the acquisition date. Acquisition related costs are expensed as incurred. We allocate total consideration to the assets acquired and liabilities assumed based on their estimated fair values, with the remaining unallocated amount recorded as goodwill. Our definite-lived intangible assets are amortized over each respective asset's estimated useful life on a straight-line basis and recorded as a component of operating income (expense). The fair value of acquired intangible assets is estimated by applying discounted cash flow models based on significant inputs not observable in the market. Key assumptions are developed based on each acquirees’ historical experience, future projections and comparable market data including future cash flows, long-term growth rates, implied royalty rates, attrition rates and discount rates. Acquisition-related contingent consideration that is classified as a liability is measured at fair value at the acquisition date. Changes in the fair value of contingent consideration liabilities in reporting periods after the acquisition date are recorded within our Consolidated Statements of Operations and Comprehensive Income.
Pension and Postretirement Benefits	Pension and Postretirement Benefits . We have benefit plans that provide for pension, medical and life insurance benefits to certain eligible employees when they retire from active service. See Note 18 to the Consolidated Financial Statements for disclosures on pension and postretirement benefits.
Taxes	Taxes . The provision for income taxes has been determined using the asset and liability approach of accounting for income taxes to reflect the expected future tax consequences of events recognized in the financial statements. Deferred income tax assets and liabilities are recognized by applying enacted tax rates to temporary differences that exist as of the balance sheet date, which result from differences in the timing of reported taxable income between tax and financial reporting. We reduce the carrying amounts of deferred tax assets by a valuation allowance if, based on the available evidence, it is more likely than not that such assets will not be realized. The need to establish valuation allowances for deferred tax assets is assessed quarterly. In assessing the requirement for, and amount of, a valuation allowance in accordance with the more likely than not standard, we give appropriate consideration to all positive and negative evidence related to the realization of the deferred tax assets. This assessment considers, among other matters, the nature, frequency and severity of current and cumulative losses and forecasts of future profitability, the duration of statutory carryforward periods, and our experience with operating loss and tax credit carryforward expirations. A history of cumulative losses is a significant piece of negative evidence used in our assessment. If a history of cumulative losses is incurred for a tax jurisdiction, forecasts of future profitability are generally not used as positive evidence related to the realization of the deferred tax assets in the assessment. We recognize the tax benefits of an uncertain tax position if those benefits are more likely than not to be sustained based on existing tax law. Additionally, we establish a reserve for tax positions that are more likely than not to be sustained based on existing tax law, but uncertain in the ultimate benefit to be sustained upon examination by the relevant taxing authorities. Unrecognized tax benefits are subsequently recognized at the time the more likely than not recognition threshold is met, the tax matter is effectively settled or the statute of limitations for the relevant taxing authority to examine and challenge the tax position has expired, whichever is earliest. Taxes collected from customers and remitted to governmental authorities are reported on a net basis.
Earnings per Share	Earnings per Share . Basic earnings per share is computed by dividing the earnings attributable to common shares by the weighted average number of shares of common stock outstanding during the period. Diluted earnings per share reflects the potential dilution of securities that could share in the earnings and is calculated using the treasury stock method.
Cash and Cash Equivalents	Cash and Cash Equivalents . Cash and cash equivalents include cash on hand and short-term investments that have maturities of three months or less when purchased.
Concentration of Credit	Concentration of Credit . We principally sell products to customers in building products industries. We monitor the creditworthiness of our customers and generally do not require collateral. Revenues from two commercial distributors, included within our Mineral Fiber and Architectural Specialties segments, individually exceeded 10 % of our revenues in 2022, 2021 and 2020. Gross sales to these two customers totaled $ 547.8 million, $ 495.8 million and $ 370.3 million in 2022, 2021 and 2020, respectively.
Receivables	Receivables . We sell our products to select, pre-approved customers using customary trade terms that allow for payment in the future. Customer trade and miscellaneous receivables (which include supply related rebates and other), net of allowances for doubtful accounts, customer credits and warranties, are reported in accounts and notes receivable, net. Cash flows from the collection of receivables are classified as operating cash flows on the Consolidated Statements of Cash Flows. We establish creditworthiness prior to extending credit. We estimate the recoverability of receivables each period. This estimate is based upon new information in the period, which can include the review of any available financial statements and forecasts, as well as discussions with legal counsel and the management of the debtor company. When events occur that impact the collectability of the receivable, all or a portion of the receivable is reserved. Account balances are charged off against the allowance when the potential for recovery is considered remote. We do not have any off-balance sheet credit exposure related to our customers.
Inventories	Inventories . Inventories are valued at the lower of cost and net realizable value. See Note 8 to the Consolidated Financial Statements for further information on our accounting for inventories.
Property Plant and Equipment	Property Plant and Equipment . Property plant and equipment is recorded at cost reduced by accumulated depreciation and amortization. Depreciation and amortization expense is recognized on a straight-line basis over the assets’ estimated useful lives. Machinery and equipment includes manufacturing equipment (depreciated over 2 to 15 years ), computer equipment (depreciated over 3 to 5 years ) and office furniture and equipment (depreciated over 5 to 7 years ). Within manufacturing equipment, assets that are subject to accelerated obsolescence or wear out quickly, such as dryer components, are generally depreciated over shorter periods while heavy production equipment, such as conveyors and production presses, are generally depreciated over longer periods. Buildings are depreciated over 15 to 30 years , depending on factors such as type of construction and use. Computer software is amortized over 3 to 7 years . Property, plant and equipment is tested for impairment by asset group when indicators of impairment are present, such as operating losses and/or negative cash flows for each identified asset group. If an indication of impairment exists, we compare the carrying amount of the asset group to the estimated undiscounted future cash flows expected to be generated by the asset group. If the carrying value exceeds the undiscounted future cash flows, we determine the fair value of the asset group based on discounted future cash flows expected to be generated by the asset group, or based on management’s estimated exit price assuming the assets could be sold in an orderly transaction between market participants, or estimated salvage value if no sale is assumed. If the fair value is less than the carrying value of the asset group, we record an impairment charge equal to the difference between the fair value and carrying value of the asset group. Impairments of assets related to our manufacturing operations are recorded in cost of goods sold. We did not test tangible assets within our continuing operations for impairment in 2022, 2021 or 2020 as no indicators of impairment existed. When assets are disposed of or retired, their costs and related depreciation or amortization are removed from the financial statements, and any resulting gains or losses are normally reflected in cost of goods sold or selling, general and administrative (“SG&A”) expenses depending on the nature of the asset.
Leases	Leases . We enter into operating and finance leases for certain manufacturing plants, warehouses, equipment and automobiles. Our leases have remaining lease terms of up to 15 years. Several leases include options for us to purchase leased items at fair value or renew for up to 5 years, or multiple 5-year renewal periods. Some of our leases include early termination options. We consider all of these options in determining the lease term used to establish our right-of-use (“ROU”) assets and lease liabilities when it is reasonably certain that we will exercise that option. Our lease agreements do not contain any residual value guarantees or material restrictive covenants. We have lease agreements with lease and non-lease components, which we have elected to combine to determine the ROU assets and lease liabilities. Short-term leases with an initial term of 12 months or less are not recorded on the balance sheet. We recognize lease expense for these leases on a straight-line basis over the lease term. As most of our leases do not provide an implicit rate, we use our Incremental Borrowing Rate (“IBR”) based on information that is available at the lease commencement date to compute the present value of lease payments. Relevant information used in determining the IBR includes the transactional currency of the lease and the lease term.
Asset Retirement Obligations	Asset Retirement Obligations . We recognize the fair value of obligations associated with the retirement of tangible long-lived assets in the period in which they are incurred. Upon initial recognition of a liability, the discounted cost is capitalized as part of the related long-lived asset and depreciated over the corresponding asset’s useful life. Over time, accretion of the liability is recognized as an operating expense to reflect the change in the liability’s present value.
Goodwill and Intangible Assets	Goodwill and Intangible Assets . Our definite-lived intangible assets are primarily customer relationships (amortized over 2 to 20 years ), developed technology (amortized over 13 to 20 years ) and acquired internally-developed software (amortized over 7 years). We review definite-lived intangible assets for impairment by asset group when indicators of impairment are present, such as operating losses and/or negative cash flows for the respective asset group. If an indication of impairment exists, we compare the carrying amount of the asset group to the estimated undiscounted future cash flows expected to be generated by the asset group. If the carrying value exceeds the undiscounted future cash flows, we determine the fair value of the asset group based on discounted future cash flows expected to be generated by the asset group or based on management’s estimated exit price assuming the assets could be sold in an orderly transaction between market participants. If the fair value is less than the carrying value of the asset group, we record an impairment charge equal to the difference between the fair value and carrying value of the asset group. We did not test definite-lived intangible assets within our continuing operations for impairment in 2022, 2021 or 2020 as no indicators of impairment existed. Our indefinite-lived assets include goodwill and other intangibles, primarily trademarks and brand names, with Armstrong representing our primary trademark. Trademarks and brand names are integral to our corporate identity and are expected to contribute indefinitely to our cash flows. Accordingly, they have been assigned an indefinite life. We conduct our annual impairment tests on these indefinite-lived intangible assets and goodwill during the fourth quarter. These assets undergo more frequent tests if an indication of possible impairment exists. When performing an impairment test for indefinite-lived intangible assets and goodwill, we compare the carrying amount of the asset (when testing indefinite-lived intangible assets) and reporting unit (when testing goodwill) to the estimated fair value. For indefinite-lived intangible assets, the estimated fair value is based on discounted future cash flows using the relief from royalty method. For goodwill, the estimated fair value is based on discounted future cash flows expected to be generated by the reporting unit. If the fair value is less than the carrying value of the asset/reporting unit, we record an impairment charge equal to the difference between the fair value and carrying value of the asset/reporting unit. We did not test indefinite-lived intangible assets within our continuing operations for impairment during any interim periods during 2022, as no indicators of impairment existed. We completed our annual impairment test in the fourth quarter of 2022 and no impairment charges were recorded in 2022, 2021 or 2020. See Note 13 to the Consolidated Financial Statements for disclosure on intangible assets.
Foreign Currency Transactions	Foreign Currency Transactions . Assets and liabilities of our subsidiaries operating outside the United States that are accounted in a functional currency other than U.S. dollars are translated using the period end exchange rate. Revenues and expenses are translated at exchange rates effective during each month. Foreign currency translation gains or losses are included as a component of accumulated other comprehensive (loss) within shareholders' equity. Gains or losses on foreign currency transactions are recognized through earnings
Financial Instruments and Derivatives	Financial Instruments and Derivatives . We use derivatives and other financial instruments to offset the effect of interest rate variability. Derivatives are recognized on the balance sheet at fair value. For derivatives that meet the criteria as designated cash flow hedges, the changes in the fair value of the derivative are recognized in other comprehensive (loss) income until the hedged item is recognized in operations. See Notes 19 and 20 to the Consolidated Financial Statements for further discussion.
Share-Based Employee Compensation	Share-based Employee Compensation . We generally recognize share-based compensation expense on a straight-line basis over the vesting period for the entire award. Compensation expense for performance-based awards with non-market-based conditions are also recognized over the vesting period for the entire award, however, compensation expense may vary based on the expectations for actual performance relative to defined performance measures. We estimate forfeitures based on actual historical forfeitures. See Note 22 to the Consolidated Financial Statements for additional information on share-based employee compensation.
Treasury Stock	Treasury Stock . Common shares repurchased by AWI are recorded on the settlement date at cost as treasury shares and result in a reduction of equity. We may reissue these treasury shares. When treasury shares are reissued, we determine the cost using the First-in, first-out cost method (“FIFO”). The difference between the cost of the treasury shares and reissuance price is included in additional paid-in capital or retained earnings.
Environmental Matters	Estimates of our future liability at the environmental sites are based on evaluations of currently available facts regarding each individual site. We consider factors such as our activities associated with the site, existing technology, presently enacted laws and regulations and prior company experience in remediating contaminated sites. Although current law imposes joint and several liability on all parties at Superfund sites, our contribution to the remediation of these sites is expected to be limited by the number of other companies potentially liable for site remediation. As a result, our estimated liability reflects only our expected share. In determining the probability of contribution, we consider the solvency of other parties, the site activities of other parties, whether liability is being disputed, the terms of any existing agreements and experience with similar matters, and the effect of our October 2006 Chapter 11 reorganization upon the validity of the claim, if any. The estimated environmental liabilities above do not take into account any claims for additional recoveries from insurance or third parties. It is our policy to record insurance recoveries as assets in the Consolidated Balance Sheets when realizable. We incur costs to pursue environmental insurance recoveries, which are expensed as incurred.

Nature Of Operations (Tables)

Nature Of Operations (Tables)	12 Months Ended
Nature Of Operations (Tables)	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule Of Segment Reporting Information	For the year ended 2022 Mineral Fiber Architectural Specialties Unallocated Total Net sales to external customers $ 887.4 $ 345.7 $ - $ 1,233.1 Equity (earnings) from joint venture ( 77.6 ) - - ( 77.6 ) Segment operating income (loss) 260.9 21.7 ( 3.9 ) 278.7 Segment assets 1,096.9 387.5 202.8 1,687.2 Depreciation and amortization 69.5 14.2 - 83.7 Investment in joint venture 23.9 - - 23.9 Purchases of property, plant and equipment 63.8 11.0 - 74.8 For the year ended 2021 Mineral Fiber Architectural Specialties Unallocated Total Net sales to external customers $ 818.5 $ 288.1 $ - $ 1,106.6 Equity (earnings) from joint venture ( 87.7 ) - - ( 87.7 ) Segment operating income (loss) 261.2 4.2 ( 5.4 ) 260.0 Segment assets 1,133.9 366.3 209.8 1,710.0 Depreciation and amortization 69.9 26.6 - 96.5 Investment in joint venture 50.0 - - 50.0 Purchases of property, plant and equipment 64.8 15.0 - 79.8 For the year ended 2020 Mineral Fiber Architectural Specialties Unallocated Total Net sales to external customers $ 726.0 $ 210.9 $ - $ 936.9 Equity (earnings) from joint venture ( 64.0 ) - - ( 64.0 ) Segment operating income 218.7 22.3 13.8 254.8 Segment assets 1,101.1 357.7 259.7 1,718.5 Depreciation and amortization 71.8 12.2 - 84.0 Investment in joint venture 41.2 - - 41.2 Purchases of property, plant and equipment 45.5 9.9 - 55.4
Reconciliation Of Total Consolidated Operating Income To Earnings Before Income Taxes	The following reconciles our total consolidated operating income to earnings (loss) from continuing operations before income taxes. These items are only measured and managed on a consolidated basis: 2022 2021 2020 Total consolidated operating income $ 278.7 $ 260.0 $ 254.8 Interest expense 27.1 22.9 24.1 Other non-operating (income) expense, net ( 6.0 ) ( 5.6 ) 357.4 Earnings (loss) from continuing operations before income taxes $ 257.6 $ 242.7 $ ( 126.7 )
Schedule Of Sales Allocated To Geographic Area	The sales in the table below are allocated to geographic areas based on the location of our selling entities. 2022 2021 2020 Geographic Areas Net sales Mineral Fiber: United States $ 816.3 $ 754.2 $ 674.1 Canada 71.1 64.3 51.9 Total Mineral Fiber 887.4 818.5 726.0 Architectural Specialties: United States $ 322.1 $ 268.0 $ 192.8 Canada 23.6 20.1 18.1 Total Architectural Specialties 345.7 288.1 210.9 Total net sales $ 1,233.1 $ 1,106.6 $ 936.9
Schedule Of Property, Plant And Equipment Allocated To Geographic Area	2022 2021 Property, plant and equipment, net at December 31, Mineral Fiber: United States $ 496.8 $ 490.6 Total Mineral Fiber 496.8 490.6 Architectural Specialties: United States $ 52.3 $ 46.5 Canada 5.3 5.7 Total Architectural Specialties 57.6 52.2 Total property, plant and equipment, net $ 554.4 $ 542.8

Revenue (Tables)

Revenue (Tables)	12 Months Ended
Revenue (Tables)	Dec. 31, 2022
Mineral Fiber [Member]
Disaggregation Of Revenue [Line Items]
Schedule of Net Sales by Major Customer Group within Each Segment	The following tables present net sales by major customer group within the Mineral Fiber and Architectural Specialties segments for the years ended December 31, 2022, 2021 and 2020: Mineral Fiber 2022 2021 2020 Distributors $ 654.1 $ 603.9 $ 525.2 Home centers 99.1 94.4 96.1 Direct customers 61.0 59.2 54.3 Retailers and other 73.2 61.0 50.4 Total $ 887.4 $ 818.5 $ 726.0
Architectural Specialties [Member]
Disaggregation Of Revenue [Line Items]
Schedule of Net Sales by Major Customer Group within Each Segment	Architectural Specialties 2022 2021 2020 Distributors $ 174.4 $ 150.5 $ 135.5 Direct customers 168.0 134.6 73.3 Retailers and other 3.3 3.0 2.1 Total $ 345.7 $ 288.1 $ 210.9

Acquisitions (Tables)

Acquisitions (Tables)	12 Months Ended
Acquisitions (Tables)	Dec. 31, 2022
Business Acquisition [Line Items]
Schedule of Business Acquisitions	The following table summarizes aggregate audited as reported information and aggregate unaudited pro forma information assuming the acquisitions of Arktura, Moz and Turf had occurred on January 1, 2020. The unaudited pro forma results include the depreciation and amortization associated with the acquired assets, compensation expense related to cash payments and equity awards granted to employees of the acquired companies and adjustments to net sales for the purchase accounting effects of recording deferred revenue at fair value. The unaudited pro forma results do not include any expected benefits of the acquisitions, adjustments to as reported changes in the fair value of the contingent consideration or adjustments to the effective tax rate. Accordingly, the unaudited pro forma results are not necessarily indicative of either future results of operations or results that might have been achieved had the acquisitions been consummated as of January 1, 2020. 2020 Net sales from continuing operations, pro forma (unaudited) $ 1,009.0 Net sales from continuing operations, as reported 936.9 Net loss from continuing operations, pro forma (unaudited) ( 69.2 ) Net loss from continuing operations, as reported ( 84.1 )
Arktura [Member]
Business Acquisition [Line Items]
Schedule of Fair Values of Identifiable Intangible Assets Acquired and Estimated Useful Lives	The following table summarizes the fair values of identifiable intangible assets acquired, and their estimated useful lives: Fair Value at Acquisition Date Estimated Useful Life Tradenames $ 12.1 Indefinite Software 9.1 7 years Backlog 5.5 1 year Customer relationships 3.6 1 year Non-compete agreements 2.1 5 years Patents 0.6 13 - 19 years Total identifiable intangible assets $ 33.0

Discontinued Operations (Tables

Discontinued Operations (Tables)	12 Months Ended
Discontinued Operations (Tables)	Dec. 31, 2022
Discontinued Operations [Abstract]
Summary of Results of Discontinued Operations	The following tables detail the businesses and line items that comprise discontinued operations on the Consolidated Statements of Operations and Comprehensive Income. EMEA and Pacific Rim Businesses Flooring Total 2022 Earnings from discontinued businesses before income tax $ - $ - $ - Income tax benefit ( 2.0 ) ( 1.0 ) ( 3.0 ) Net earnings from discontinued operations, net of tax $ 2.0 $ 1.0 $ 3.0 Net earnings from discontinued operations $ 2.0 $ 1.0 $ 3.0 EMEA and Pacific Rim Businesses 2021 (Loss) from disposal of discontinued businesses, before income tax $ ( 0.4 ) Income tax expense 1.7 (Loss) from disposal of discontinued businesses, net of tax $ ( 2.1 ) Net (loss) from discontinued operations $ ( 2.1 ) EMEA and Pacific Rim Businesses Flooring Total 2020 (Loss) gain from disposal of discontinued businesses, before income tax $ ( 17.2 ) $ 0.8 $ ( 16.4 ) Income tax (benefit) ( 1.4 ) - ( 1.4 ) (Loss) gain from disposal of discontinued businesses, net of tax $ ( 15.8 ) $ 0.8 $ ( 15.0 ) Net (loss) earnings from discontinued operations $ ( 15.8 ) $ 0.8 $ ( 15.0 )
Summary of Total Gains and Losses, Capital Expenditures and Operating Lease	The following is a summary of total gains and losses related to our former EMEA and Pacific Rim businesses through the date of disposal, and gains on the dissolution of our previously discontinued flooring entity, which are presented as discontinued operations and included as components of operating and investing cash flows on our Consolidated Statements of Cash Flows: 2021 2020 Loss on sale to Knauf (1) $ 0.4 $ 17.2 Gain on dissolution of flooring entity (2) - ( 0.8 ) (1) Represents certain pension liabilities, working capital and other adjustments. (2) Represents AOCI adjustments related to accumulated foreign currency translation amounts.

Accounts and Notes Receivable (

Accounts and Notes Receivable (Tables)	12 Months Ended
Accounts and Notes Receivable (Tables)	Dec. 31, 2022
Receivables [Abstract]
Schedule of Accounts and Notes Receivable	December 31, 2022 December 31, 2021 Customer receivables $ 107.4 $ 104.7 Miscellaneous receivables 8.2 7.9 Less allowance for warranties, discounts and losses ( 3.2 ) ( 3.5 ) Accounts and notes receivable, net $ 112.4 $ 109.1

Inventories (Tables)

Inventories (Tables)	12 Months Ended
Inventories (Tables)	Dec. 31, 2022
Inventory Disclosure [Abstract]
Schedule of Inventories	December 31, 2022 December 31, 2021 Finished goods $ 60.9 $ 49.9 Goods in process 6.5 6.4 Raw materials and supplies 63.0 48.4 Less LIFO reserves ( 20.4 ) ( 14.5 ) Total inventories, net $ 110.0 $ 90.2
Summary Of Inventory Not Accounted For Under LIFO	The following table summarizes the amount of inventory that is not accounted for under the LIFO method. December 31, 2022 December 31, 2021 U.S. locations $ 43.2 $ 28.0 Canada locations 3.1 2.7 Total $ 46.3 $ 30.7

Other Current Assets (Tables)

Other Current Assets (Tables)	12 Months Ended
Other Current Assets (Tables)	Dec. 31, 2022
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Schedule of Other Current Assets	December 31, 2022 December 31, 2021 Prepaid expenses $ 16.6 $ 17.2 Assets held for sale 4.6 4.6 Fair value of derivative assets 3.7 - Other 1.4 1.3 Total other current assets $ 26.3 $ 23.1 As of December 31, 2022 and 2021, assets held for sale included the property, plant and equipment of our idled Mineral Fiber plant in St. Helens, Oregon.

Property, Plant And Equipment (

Property, Plant And Equipment (Tables)	12 Months Ended
Property, Plant And Equipment (Tables)	Dec. 31, 2022
Property, Plant and Equipment [Abstract]
Schedule Of Property, Plant And Equipment	December 31, 2022 December 31, 2021 Land $ 31.8 $ 31.8 Buildings 267.8 257.2 Machinery and equipment 686.1 643.9 Computer software 69.2 52.6 Construction in progress 49.0 51.3 Less accumulated depreciation and amortization ( 549.5 ) ( 494.0 ) Net property, plant and equipment $ 554.4 $ 542.8

Equity Investments (Tables)

Equity Investments (Tables) - WAVE [Member]	12 Months Ended
Equity Investments (Tables) - WAVE [Member]	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Summary of Investment in Joint Venture, Balance Sheet Data	Condensed financial data for WAVE is summarized below. December 31, 2022 December 31, 2021 Current assets $ 100.8 $ 119.7 Non-current assets (1) 86.3 42.1 Current liabilities (1) 31.3 37.1 Other non-current liabilities (1) 372.3 297.4 (1) Includes initial ROU assets and lease liabilities of $ 29.4 million recognized upon adoption of Accounting Standards Codification Topic 842 – Leases on January 1, 2022.
Summary of Investment in Joint Venture, Income Statement Data	2022 2021 2020 Net sales $ 458.2 $ 430.8 $ 343.3 Gross profit 231.1 244.5 194.7 Net earnings 163.7 184.6 137.8
Summary of the Difference Between Carrying Amount and Underlying Equity of Equity Method Investment	Our recorded investment in WAVE was higher than our 50 % share of the carrying values reported in WAVE’s consolidated financial statements by $ 132.2 million as of December 31, 2022 and $ 136.4 million as of December 31, 2021. These differences are due to our adoption of fresh-start reporting upon emergence from Chapter 11 in October 2006, while WAVE’s consolidated financial statements do not reflect fresh-start reporting. The differences are composed of the following fair value adjustments to assets: December 31, 2022 December 31, 2021 Property, plant and equipment $ 0.4 $ 0.4 Other intangibles 101.4 105.6 Goodwill 30.4 30.4 Total $ 132.2 $ 136.4

Leases (Tables)

Leases (Tables)	12 Months Ended
Leases (Tables)	Dec. 31, 2022
Leases [Abstract]
Schedule of Lease Costs	The following table presents our lease costs: 2022 2021 2020 Operating lease cost $ 7.0 $ 6.4 $ 5.6 Finance lease cost: Amortization of leased assets $ 2.4 $ 2.4 $ 2.0 Interest on lease liabilities 0.6 0.7 0.6 Total finance lease cost $ 3.0 $ 3.1 $ 2.6
Summary of Supplemental Cash Flow Information Related To Leases	The following table presents supplemental cash flow information related to our leases: 2022 2021 2020 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases $ 6.8 $ 6.3 $ 5.4 Operating cash flows from finance leases 0.6 0.7 0.6 Financing cash flows from finance leases 2.2 2.1 1.8 ROU assets obtained in exchange for lease liabilities Operating leases (1) $ 3.9 $ 7.3 $ 5.4 Finance leases - 0.3 2.6 (1) The years ended December 31, 2022, 2021 and 2020 include increases in ROU assets of $ 1.0 million, $ 3.2 million and $ 0.4 million, respectively, resulting from modifications that did not involve obtaining a new ROU asset. Modifications resulted primarily from changes in the terms of existing leases.
Schedule of Weighted Average Assumptions Used To Compute Right To Use Assets	The following table presents the weighted average assumptions used to compute our ROU assets and lease liabilities: December 31, 2022 December 31, 2021 Weighted average remaining lease term (in years) Operating leases 5.1 5.4 Finance leases 9.4 9.9 Weighted average discount rate Operating leases 3.8 % 3.4 % Finance leases 3.7 % 3.6 %
Schedule of Undiscounted Future Minimum Payments	Undiscounted future minimum lease payments as of December 31, 2022, by year and in the aggregate, having non-cancelable lease terms in excess of one year are as follows: Operating Leases Finance Leases Maturity of lease liabilities 2023 $ 6.5 $ 2.8 2024 4.8 2.6 2025 2.9 2.3 2026 1.7 2.4 2027 1.6 2.5 Thereafter 3.9 7.6 Total lease payments 21.4 20.2 Less interest ( 2.3 ) ( 3.4 ) Present value of lease liabilities $ 19.1 $ 16.8

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
Goodwill and Intangible Assets (Tables)	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill and Intangible Assets	The following table details amounts related to our goodwill and intangible assets as of December 31, 2022 and 2021: December 31, 2022 December 31, 2021 Estimated Gross Accumulated Amortization Gross Accumulated Amortization Amortizing intangible assets Customer relationships 2 - 20 years $ 182.1 $ 142.0 $ 196.7 $ 144.8 Developed technology 13 - 20 years 93.8 83.3 92.9 82.6 Software 7 years 9.1 2.6 9.1 1.3 Trademarks and brand names 3 - 10 years 4.0 2.6 4.0 2.0 Non-compete agreements 3 - 5 years 5.8 2.6 5.6 1.4 Other Various 1.1 0.1 0.4 0.1 Total $ 295.9 $ 233.2 $ 308.7 $ 232.2 Non-amortizing intangible assets Trademarks and brand names Indefinite 345.0 344.9 Total intangible assets $ 640.9 $ 653.6 Goodwill Indefinite $ 167.3 $ 167.0 2022 2021 2020 Amortization expense $ 16.3 $ 33.8 $ 22.1
Schedule of Expected Annual Amortization Expense	The expected annual amortization expense for the years 2023 through 2027 are as follows: 2023 $ 13.9 2024 13.4 2025 12.7 2026 9.2 2027 3.1

Accounts Payable And Accrued _2

Accounts Payable And Accrued Expenses (Tables)	12 Months Ended
Accounts Payable And Accrued Expenses (Tables)	Dec. 31, 2022
Payables and Accruals [Abstract]
Schedule of Accounts Payable and Accrued Expenses	December 31, 2022 December 31, 2021 Payables, trade and other $ 105.0 $ 105.8 Employment costs 20.0 30.3 Current portion of pension and postretirement liabilities 9.9 9.9 Acquisition-related contingent consideration 15.2 8.6 Other 22.4 20.3 Total accounts payable and accrued expenses $ 172.5 $ 174.9

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
Income Taxes (Tables)	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Schedule Of Deferred Tax Assets and Liabilities	December 31, 2022 December 31, 2021 Deferred income tax assets (liabilities) Net operating losses $ 34.2 $ 42.5 Postretirement benefits 16.7 20.7 Pension benefit liabilities 8.2 11.0 Deferred compensation 7.1 7.9 Foreign tax credit carryforwards - 0.6 State tax credit carryforwards 4.7 8.7 Capital loss carryforwards 18.8 18.8 Capitalized research expenses 9.4 - Lease right-of-use liabilities 9.7 9.8 Other 3.8 12.3 Total deferred income tax assets 112.6 132.3 Valuation allowances ( 48.7 ) ( 60.6 ) Net deferred income tax assets 63.9 71.7 Intangibles ( 85.1 ) ( 87.4 ) Partnerships and investments ( 25.5 ) ( 26.4 ) Accumulated depreciation ( 86.4 ) ( 80.4 ) Prepaid pension costs ( 21.2 ) ( 27.8 ) Inventories ( 4.9 ) ( 4.9 ) Lease right-of-use assets ( 9.9 ) ( 10.1 ) Other ( 0.3 ) ( 1.6 ) Total deferred income tax liabilities ( 233.3 ) ( 238.6 ) Net deferred income tax liabilities $ ( 169.4 ) $ ( 166.9 )
Schedule of Components of Income Tax Expense (Benefit)	2022 2021 2020 Details of taxes Earnings (loss) from continuing operations before income taxes Domestic $ 251.7 $ 239.3 $ ( 130.0 ) Foreign 5.9 3.4 3.3 Total $ 257.6 $ 242.7 $ ( 126.7 ) Income tax expense (benefit): Current: Federal $ 46.3 $ 39.4 $ 40.8 Foreign 1.3 0.6 1.0 State 11.3 8.7 5.6 Total current 58.9 48.7 47.4 Deferred: Federal ( 1.9 ) 3.6 ( 75.5 ) Foreign ( 0.2 ) 0.6 - State 0.9 4.5 ( 14.5 ) Total deferred ( 1.2 ) 8.7 ( 90.0 ) Total income tax expense (benefit) $ 57.7 $ 57.4 $ ( 42.6 )
Schedule Of The Reconciliation To U.S. Statutory Tax Rate	2022 2021 2020 Reconciliation to U.S. statutory tax rate Continuing operations tax expense (benefit) at statutory rate $ 54.1 $ 51.0 $ ( 26.6 ) Decrease in valuation allowances on deferred income tax assets ( 1.7 ) ( 17.8 ) ( 0.1 ) Expiration of deferred income tax assets 0.7 18.3 - State income tax expense (benefit), net of federal impact 11.0 11.0 ( 7.3 ) Capital loss on sale of investment - - ( 4.6 ) Statute closures ( 5.1 ) ( 3.8 ) ( 1.3 ) State deferred tax adjustments - - ( 1.5 ) Excess tax benefits on share-based compensation ( 0.5 ) ( 0.8 ) ( 0.9 ) U.S. permanent differences ( 0.8 ) ( 1.3 ) ( 2.2 ) Other - 0.8 1.9 Tax expense (benefit) at effective rate $ 57.7 $ 57.4 $ ( 42.6 )
Schedule Of Unrecognized Tax Benefits	We had the following activity for UTB’s for the years ended December 31, 2022, 2021 and 2020: 2022 2021 2020 Unrecognized tax benefits balance at January 1, $ 35.6 $ 41.7 $ 34.7 Gross change for current year positions 0.4 1.7 2.3 Increase for prior period positions 0.2 - 8.7 Decrease for prior period positions ( 1.4 ) ( 3.6 ) - Decrease due to statute expirations ( 7.5 ) ( 4.2 ) ( 4.0 ) Unrecognized tax benefits balance at December 31, $ 27.3 $ 35.6 $ 41.7
Schedule Of Other Taxes	2022 2021 2020 Other taxes Payroll taxes $ 18.3 $ 13.4 $ 15.6 Property, franchise and capital stock taxes 4.5 4.4 4.2

Debt (Tables)

Debt (Tables)	12 Months Ended
Debt (Tables)	Dec. 31, 2022
Debt Instrument [Line Items]
Schedule Of Debt	December 31, 2022 December 31, 2021 Revolving credit facility due 2027 $ 205.0 $ - Revolving credit facility due 2024 - 165.0 Term loan A due 2027 450.0 - Term loan A due 2024 - 468.7 Principal debt outstanding 655.0 633.7 Unamortized debt financing costs ( 3.9 ) ( 2.3 ) Long-term debt 651.1 631.4 Less current portion - 25.0 Total long-term debt, less current portion $ 651.1 $ 606.4
Scheduled Payments Of Long-Term Debt	Scheduled payments of long-term debt: 2023 $ - 2024 22.5 2025 22.5 2026 22.5 2027 587.5 2028 and later -
Letter of Credit [Member]
Debt Instrument [Line Items]
Schedule of Letters of Credit Facilities	The following table presents details related to our letters of credit facilities: December 31, 2022 Financing Arrangements Limit Used Available Bi-lateral facility $ 25.0 $ 8.1 $ 16.9 Revolving credit facility 150.0 - 150.0 Total $ 175.0 $ 8.1 $ 166.9

Pension And Other Benefit Pro_2

Pension And Other Benefit Programs (Tables)	12 Months Ended
Pension And Other Benefit Programs (Tables)	Dec. 31, 2022
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Schedule Of Amounts Recognized In Assets And Liabilities	Amounts recognized in assets (liabilities) on the consolidated balance sheets at year end consist of: U.S. Pension Plans Non-U.S. Pension Plan Retiree Health and Life 2022 2021 2022 2021 2022 2021 Prepaid pension costs $ 83.2 $ 109.0 $ - $ - $ - $ - Accounts payable and accrued expenses ( 2.7 ) ( 2.9 ) ( 0.1 ) ( 0.1 ) ( 7.1 ) ( 6.9 ) Postretirement benefit liabilities - - - - ( 54.8 ) ( 71.1 ) Pension benefit liabilities ( 25.9 ) ( 34.5 ) ( 1.7 ) ( 2.4 ) - - Net amount recognized $ 54.6 $ 71.6 $ ( 1.8 ) $ ( 2.5 ) $ ( 61.9 ) $ ( 78.0 )
Schedule Of Amounts In Accumulated Other Comprehensive Income (Loss) At Year End	Pre-tax amounts recognized in accumulated other comprehensive (loss) income at year end consist of: U.S. Pension Plans Retiree Health and Life 2022 2021 2022 2021 Net actuarial (loss) gain $ ( 171.9 ) $ ( 152.1 ) $ 23.3 $ 13.7 Prior service credit - - 1.2 1.4 Accumulated other comprehensive (loss) $ ( 171.9 ) $ ( 152.1 ) $ 24.5 $ 15.1
Schedule Of Expected Benefit Payments	The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid over the next ten years for our U.S. plans: U.S. Pension (1) Retiree Health 2023 $ 17.0 $ 7.0 2024 18.5 6.7 2025 20.4 6.5 2026 21.6 6.0 2027 22.9 5.6 2028 - 2032 121.2 23.0 (1) We were not required and did not make contributions to the RIP during 2022, 2021 or 2020 as, based on guidelines established by the Pension Benefit Guaranty Corporation, the RIP had sufficient assets to fund its distribution obligations. Benefit payments to RIP participants have been made directly from the RIP while benefit payments under the RBEP are made from Company cash.
Defined Benefit Pension Plans [Member]
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Schedule Of Net Funded Status	2022 2021 Change in benefit obligations: Benefit obligations as of beginning of period $ 435.1 $ 441.7 Service cost 3.7 4.8 Interest cost 10.5 9.0 Actuarial (gain) ( 99.8 ) ( 10.9 ) Benefits paid ( 12.4 ) ( 9.5 ) Benefit obligations as of end of period $ 337.1 $ 435.1 2022 2021 Change in plan assets: Fair value of plan assets as of beginning of period $ 506.7 $ 520.7 Actual return on plan assets ( 105.4 ) ( 7.4 ) Employer contributions 2.8 2.9 Benefits paid ( 12.4 ) ( 9.5 ) Fair value of plan assets as of end of period $ 391.7 $ 506.7 Funded status $ 54.6 $ 71.6
Schedule Of Assumptions Used	2022 2021 Weighted-average assumptions used to determine benefit Discount rate 5.21 % 2.98 % Rate of compensation increase 3.33 % 3.05 % Weighted-average assumptions used to determine net periodic Discount rate 2.97 % 2.67 % Expected return on plan assets 3.75 % 3.25 % Rate of compensation increase 3.05 % 3.05 %
Schedule Of Benefit Obligations In Excess Of Assets	2022 2021 Pension plans with benefit obligations in excess of assets RBEP Projected benefit obligation, December 31 $ 28.6 $ 37.4 RBEP Accumulated benefit obligation, December 31 28.6 37.4
Schedule Of Periodic Benefit Costs	The components of the pension cost for the U.S. defined benefit pension plans are as follows: 2022 2021 2020 Service cost of benefits earned during the period $ 3.7 $ 4.8 $ 5.5 Interest cost on projected benefit obligation 10.5 9.0 15.5 Expected return on plan assets ( 18.4 ) ( 16.5 ) ( 34.5 ) Recognized net actuarial loss 4.2 3.5 6.3 Settlement - - 374.4 Special termination benefits - - 2.0 Net periodic pension cost $ - $ 0.8 $ 369.2
Schedule Of Defined Asset Allocation	Each asset class utilized by the RIP has defined asset allocation targets and allowable ranges. The table below shows the asset allocation targets and the December 31, 2022 and 2021 positions for each asset class: Target Weight at December 31, Position at December 31, Asset Class 2022 2022 2021 Long duration bonds 90.0 % 90.0 % 89.0 % Equities, real estate and private equity 10.0 % 10.0 % 11.0 %
Summary Of Fair Value Of Assets Plan	The following table sets forth by level within the fair value hierarchy a summary of the RIP plan assets measured at fair value on a recurring basis: Value at December 31, 2022 Description Level 1 Level 2 Level 3 Total Collective trust funds - bonds $ - $ 350.3 $ - $ 350.3 Collective trust funds - equities - 32.6 - 32.6 Cash, other short-term investments and payables, net ( 0.3 ) 3.5 - 3.2 Net assets measured at fair value $ ( 0.3 ) $ 386.4 $ - $ 386.1 Investments measured at net asset value as a practical expedient 5.6 Net assets $ 391.7 Value at December 31, 2021 Description Level 1 Level 2 Level 3 Total Collective trust funds - bonds $ - $ 451.9 $ - $ 451.9 Collective trust funds - equities - 46.8 - 46.8 Cash, other short-term investments and payables, net ( 0.3 ) 1.9 - 1.6 Net assets measured at fair value $ ( 0.3 ) $ 500.6 $ - $ 500.3 Investments measured at net asset value as a practical expedient 6.4 Net assets $ 506.7
Summary Of Assets Measured At NAV	The following table sets forth a summary of the RIP’s investments measured at NAV: Value at December 31, 2022 Description Fair Value Unfunded Redemption Redemption Real estate $ 5.6 $ 2.2 Quarterly 60 days Value at December 31, 2021 Description Fair Value Unfunded Redemption Redemption Real estate $ 6.4 $ 2.2 Quarterly 60 days
U.S. Defined-Benefit Retiree Health And Life Insurance Plans [Member]
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Schedule Of Net Funded Status	2022 2021 Change in benefit obligations: Benefit obligation as of beginning of period $ 78.0 $ 81.4 Interest cost 1.5 1.2 Plan participants' contributions 1.6 1.9 Actuarial (gain) loss ( 12.4 ) 2.0 Benefits paid ( 6.8 ) ( 8.5 ) Benefit obligations as of end of period $ 61.9 $ 78.0 2022 2021 Change in plan assets: Fair value of plan assets as of beginning of period $ - $ - Employer contributions 5.2 6.6 Plan participants' contributions 1.6 1.9 Benefits paid ( 6.8 ) ( 8.5 ) Fair value of plan assets as of end of period $ - $ - Funded status $ ( 61.9 ) $ ( 78.0 )
Schedule Of Assumptions Used	2022 2021 Weighted-average discount rate used to determine benefit obligations at end of period 5.12 % 2.72 % Weighted-average discount rate used to determine net periodic benefit cost for the period 2.73 % 2.35 %
Schedule Of Periodic Benefit Costs	The components of postretirement benefit (credit) are as follows: 2022 2021 2020 Interest cost on accumulated postretirement benefit obligation $ 1.5 $ 1.2 $ 1.9 Amortization of prior service (credit) ( 0.3 ) ( 0.3 ) ( 0.3 ) Amortization of net actuarial gain ( 2.8 ) ( 2.2 ) ( 6.6 ) Net periodic postretirement benefit (credit) $ ( 1.6 ) $ ( 1.3 ) $ ( 5.0 )

Financial Instruments and Con_2

Financial Instruments and Contingent Consideration (Tables)	12 Months Ended
Financial Instruments and Contingent Consideration (Tables)	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Estimated Fair Value of Financial Instruments	The estimated fair values of our financial instruments and contingent consideration are as follows: December 31, 2022 December 31, 2021 Carrying Estimated Carrying Estimated Assets (liabilities), net: Total long-term debt, including current portion $ ( 651.1 ) $ ( 645.3 ) $ ( 631.4 ) $ ( 626.0 ) Interest rate swap contracts 11.4 11.4 ( 14.2 ) ( 14.2 ) Acquisition-related contingent consideration ( 15.2 ) ( 15.2 ) ( 12.8 ) ( 12.8 )
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The fair value measurement of assets and liabilities measured at fair value on a recurring basis and reported on the Consolidated Balance Sheets is summarized below: December 31, 2022 December 31, 2021 Fair value based on Fair value based on Other Other Other Level 2 Level 2 Level 3 Assets (liabilities), net: Interest rate swap contracts $ 11.4 $ ( 14.2 ) $ - Acquisition-related contingent consideration - - ( 4.2 )
Schedule of Weighted-average Of Significant Unobservable Inputs	The following table summarizes the weighted-average of the significant unobservable inputs as of December 31, 2021: Turf Unobservable input Volatility 22.2 % Discount rates 2.7 %
Schedule of Changes in Fair Value of the Acquisition-related Contingent Consideration Liability	The changes in fair value of the acquisition-related contingent consideration liability for the years ended December 31, 2022, 2021 and 2020 were as follows: Fair Value of Contingent Consideration Balance as of January 1, 2020 $ - Acquisition date fair value of Moz contingent consideration 2.7 Acquisition date fair value of Turf contingent consideration 14.1 Loss related to change in fair value of contingent consideration 0.1 Balance as of December 31, 2020 $ 16.9 (Gain) related to change in fair value of contingent consideration ( 4.1 ) Balance as of December 31, 2021 $ 12.8 Cash consideration paid ( 8.6 ) Loss related to change in fair value of contingent consideration 11.0 Balance as of December 31, 2022 $ 15.2

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	12 Months Ended
Derivative Financial Instruments (Tables)	Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Interest Rate Swaps	The following table summarizes our interest rate swaps as of December 31, 2022: Trade Date Notional Amount Coverage Period Risk Coverage November 28, 2018 $ 200.0 November 2018 to November 2023 USD-LIBOR September 19, 2022 $ 25.0 September 2022 to December 2023 USD-LIBOR March 10, 2020 $ 50.0 March 2021 to March 2024 USD-LIBOR March 11, 2020 $ 50.0 March 2021 to March 2024 USD-LIBOR November 28, 2018 $ 100.0 March 2021 to March 2025 USD-LIBOR
Summary of Fair Value of Derivative Instruments on Consolidated Balance Sheet	Derivative Assets Derivative Liabilities Fair Value Fair Value Balance Sheet December 31, December 31, Balance Sheet December 31, December 31, Interest rate swap contracts Other current assets $ 3.7 $ - Accounts payable and accrued expenses $ - $ 0.1 Interest rate swap contracts Other non-current assets 7.7 0.4 Other long-term liabilities - 14.5
Summary of Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income	Amount of Gain (Loss) Location of Gain (Loss) Reclassified from Gain Reclassified 2022 2021 2020 2022 2021 2020 Derivatives in cash flow hedging relationships Interest rate swap contracts $ 26.9 $ 21.9 $ ( 8.6 ) Interest expense $ 2.0 $ 8.5 $ 5.6

Other Long-Term Liabilities (Ta

Other Long-Term Liabilities (Tables)	12 Months Ended
Other Long-Term Liabilities (Tables)	Dec. 31, 2022
Other Liabilities Disclosure [Abstract]
Schedule of Other Long-Term Liabilities	December 31, 2022 December 31, 2021 Long-term deferred compensation arrangements $ 15.4 $ 17.6 Fair value of derivative liabilities - 14.5 Environmental insurance recoveries received in excess of cumulative expenses incurred 3.5 4.8 Acquisition-related contingent consideration - 4.2 Other 6.9 5.6 Total other long-term liabilities $ 25.8 $ 46.7

Share-Based Compensation Plans

Share-Based Compensation Plans (Tables)	12 Months Ended
Share-Based Compensation Plans (Tables)	Dec. 31, 2022
Schedule of Changes in Stock Options	The following table presents stock option activity for the year ended December 31, 2022: Number of shares (thousands) Weighted-average exercise price Weighted-average remaining contractual term (years) Aggregate intrinsic value Option shares outstanding, December 31, 2021 73.5 $ 46.05 Option shares exercised ( 39.6 ) $ 44.93 Option shares outstanding, December 31, 2022 33.9 $ 47.35 1.1 $ 0.7 Option shares exercisable, vested and expected to vest, 33.9 $ 47.35 1.1 $ 0.7
Schedule of Information Related to Stock Option Exercises	The following table presents information related to stock option exercises: 2022 2021 2020 Total intrinsic value of stock options exercised $ 1.3 $ 4.1 $ 5.6 Cash proceeds received from stock options exercised 1.8 2.5 4.7 Tax deduction realized from stock options exercised 0.1 0.4 1.2
Schedule of Restricted Stock and Restricted Stock Units Activity	We also grant non-vested stock awards in the form of Restricted Stock Units (“RSUs”), Performance Stock Units (“PSUs”) and Restricted Stock Awards ("RSAs"). A summary of the 2022 activity related to the RSUs, PSUs and RSAs is as follows: Non-Vested Stock Awards RSUs PSUs RSAs Number of shares (thousands) Weighted- Number of shares (thousands) Weighted- Number of shares (thousands) Weighted- December 31, 2021 65.0 $ 87.94 301.8 $ 92.74 72.6 $ 77.99 Granted 77.3 86.98 118.2 96.67 - - Performance adjustments - - ( 27.5 ) ( 71.84 ) - - Vested ( 24.1 ) ( 90.32 ) ( 74.4 ) ( 77.80 ) ( 20.4 ) ( 77.90 ) Forfeited ( 6.1 ) ( 87.60 ) ( 11.7 ) ( 102.92 ) ( 1.5 ) ( 77.22 ) December 31, 2022 112.1 $ 86.66 306.4 $ 99.38 50.7 $ 78.05
ScheduleOfShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsValuationAssumptionsTableTextBlock	2022 2021 Weighted-average grant date fair value of market-based PSUs granted (dollars per award) $ 104.92 $ 117.85 Assumptions Risk-free rate of return 1.8 % 0.3 % Expected volatility 37.0 % 37.0 % Expected term (in years) 3.1 3.1 Expected dividend yield 0.0 % 0.0 %

Employee Costs (Tables)

Employee Costs (Tables)	12 Months Ended
Employee Costs (Tables)	Dec. 31, 2022
Compensation Related Costs [Abstract]
Schedule Of Employee Costs	2022 2021 2020 Wages, salaries and incentive compensation $ 259.7 $ 259.9 $ 207.6 Payroll taxes 18.3 13.4 15.6 Defined contribution and defined benefit pension plan expense, net 8.5 10.0 1.0 Insurance and other benefit costs 29.9 28.2 25.1 Share-based compensation 14.3 11.3 6.9 Total $ 330.7 $ 322.8 $ 256.2

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	12 Months Ended
Shareholders' Equity (Tables)	Dec. 31, 2022
Stockholders' Equity Note [Abstract]
Components of Accumulated Other Comprehensive Income (Loss)	The balance of each component of accumulated other comprehensive (loss), net of tax is presented in the table below. December 31, 2022 December 31, 2021 Foreign currency translation adjustments $ 0.5 $ 2.3 Derivative gain (loss), net 9.5 ( 9.1 ) Pension and postretirement adjustments ( 110.1 ) ( 102.8 ) Accumulated other comprehensive (loss) $ ( 100.1 ) $ ( 109.6 )
Schedule of Other Comprehensive Income (Loss)	The amounts and related tax effects allocated to each component of other comprehensive income (loss) for 2022, 2021, and 2020 are presented in the tables below. Pre-tax Amount Tax (Expense) Benefit After-tax Amount 2022 Foreign currency translation adjustments $ ( 1.8 ) $ - $ ( 1.8 ) Derivative gain, net 24.9 ( 6.3 ) 18.6 Pension and postretirement adjustments ( 9.6 ) 2.3 ( 7.3 ) Total other comprehensive income (loss) $ 13.5 $ ( 4.0 ) $ 9.5 Pre-tax Amount Tax (Expense) Benefit After-tax Amount 2021 Derivative gain, net $ 13.4 $ ( 3.5 ) $ 9.9 Pension and postretirement adjustments ( 13.4 ) 3.2 ( 10.2 ) Total other comprehensive (loss) $ - $ ( 0.3 ) $ ( 0.3 ) Pre-tax Amount Tax Benefit (Expense) After-tax Amount 2020 Foreign currency translation adjustments $ ( 7.1 ) $ - $ ( 7.1 ) Derivative (loss), net ( 14.2 ) 3.7 ( 10.5 ) Pension and postretirement adjustments 382.9 ( 98.5 ) 284.4 Total other comprehensive income (loss) $ 361.6 $ ( 94.8 ) $ 266.8
Schedule of Accumulated Other Comprehensive Income Activity	The following table summarizes the activity, by component, related to the change in AOCI for December 31, 2022 and 2021: Foreign Derivative (1) Pension and Postretirement Adjustments (1) Total (1) Balance, December 31, 2020 $ 2.3 $ ( 19.0 ) $ ( 92.6 ) $ ( 109.3 ) Other comprehensive income (loss) before reclassifications, 5.4 ), $ 3.5 and ($ 1.9 ) - 16.5 ( 11.0 ) 5.5 Amounts reclassified from accumulated other - ( 6.6 ) 0.8 ( 5.8 ) Net current period other comprehensive income (loss) - 9.9 ( 10.2 ) ( 0.3 ) Balance, December 31, 2021 2.3 ( 9.1 ) ( 102.8 ) ( 109.6 ) Other comprehensive (loss) income before reclassifications, 6.7 ), $ 2.6 and ($ 4.1 ) ( 1.8 ) 20.2 ( 8.1 ) 10.3 Amounts reclassified from accumulated other - ( 1.6 ) 0.8 ( 0.8 ) Net current period other comprehensive (loss) income ( 1.8 ) 18.6 ( 7.3 ) 9.5 Balance, December 31, 2022 $ 0.5 $ 9.5 $ ( 110.1 ) $ ( 100.1 ) (1) Amounts are net of tax
Reclassification out of Accumulated Other Comprehensive Income	The amounts reclassified from AOCI and the affected line item of the Consolidated Statements of Operations and Comprehensive Income are presented in the table below. Amounts Affected Line Item in the 2022 2021 Derivative Adjustments: Interest rate swap contracts, before tax $ ( 2.0 ) $ ( 8.5 ) Interest expense Tax impact 0.4 1.9 Income tax expense (benefit) Total (income), net of tax ( 1.6 ) ( 6.6 ) Pension and Postretirement Adjustments: Prior service credit amortization ( 0.3 ) ( 0.3 ) Other non-operating (income) expense, net Amortization of net actuarial loss 1.4 1.4 Other non-operating (income) expense, net Total loss, before tax 1.1 1.1 Tax impact ( 0.3 ) ( 0.3 ) Income tax expense (benefit) Total loss, net of tax 0.8 0.8 Total reclassifications for the period $ ( 0.8 ) $ ( 5.8 )

Supplemental Financial Inform_2

Supplemental Financial Information (Tables)	12 Months Ended
Supplemental Financial Information (Tables)	Dec. 31, 2022
Supplemental Financial Information [Abstract]
Schedule Of Supplemental Financial Information	2022 2021 2020 Selected operating expense Maintenance and repair costs $ 42.7 $ 41.9 $ 38.1 Product innovation costs 14.9 14.6 14.7 Advertising costs 9.2 8.0 6.8 Other non-operating (income) expense, net Interest income $ ( 0.5 ) $ ( 0.1 ) $ ( 0.3 ) Pension and postretirement (credits) cost ( 5.3 ) ( 5.3 ) 358.7 Other ( 0.2 ) ( 0.2 ) ( 1.0 ) Total $ ( 6.0 ) $ ( 5.6 ) $ 357.4

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
Earnings Per Share (Tables)	Dec. 31, 2022
Earnings Per Share [Abstract]
Reconciliation of Earnings (Loss) to Earnings (Loss) Attributable to Common Shares Used in Basic and Diluted Earnings (Loss) Per Share Calculation	The following table is a reconciliation of earnings (loss) to earnings (loss) attributable to common shares used in our basic and diluted Earnings (Loss) Per Share (“EPS”) calculations for the years ended December 31, 2022, 2021 and 2020. EPS components may not add due to rounding. 2022 2021 2020 Earnings (loss) from continuing operations $ 199.9 $ 185.3 $ ( 84.1 ) (Earnings) allocated to participating vested share awards ( 0.3 ) ( 0.3 ) ( 0.1 ) Earnings (loss) from continuing operations attributable to common shares $ 199.6 $ 185.0 $ ( 84.2 )
Reconciliation of Basic Shares Outstanding to Diluted Shares Outstanding	The following table is a reconciliation of basic shares outstanding to diluted shares outstanding for the years ended December 31, 2022, 2021 and 2020 (shares in millions): 2022 2021 2020 Basic shares outstanding 46.3 47.6 47.9 Dilutive effect of common stock equivalents 0.1 0.3 - Diluted shares outstanding 46.4 47.9 47.9

Business (Narrative) (Details)

Business (Narrative) (Details) - Facility	1 Months Ended
Business (Narrative) (Details) - Facility	Nov. 30, 2022	Dec. 31, 2020	Aug. 31, 2020	Jul. 31, 2020
GC Products, Inc [Member]
Business And Basis Of Presentation [Line Items]
Number of manufacturing facility	1
Arktura [Member]
Business And Basis Of Presentation [Line Items]
Number of manufacturing facility		1
Moz Designs, Inc. [Member]
Business And Basis Of Presentation [Line Items]
Number of manufacturing facility			1
Turf [Member]
Business And Basis Of Presentation [Line Items]
Number of manufacturing facility				1

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Narrative) (Details)	3 Months Ended	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2022 USD ($) Customer	Dec. 31, 2021 USD ($) Customer	Dec. 31, 2020 USD ($) Customer
Significant Accounting Policies [Line Items]
Payment terms on sales		45 days
Revenue from Contract with Customer, Excluding Assessed Tax		$ 1,233,100,000	$ 1,106,600,000	$ 936,900,000
Lease renewal term operating and finance lease		5 years
Operating and finance lease existence of option to terminate		true
Short-term leases term		12 months
Impairment charges	$ 0
Software Development [Member]
Significant Accounting Policies [Line Items]
Definite-lived intangible assets, useful life		7 years
Minimum [Member] \| Computer Equipment [Member]
Significant Accounting Policies [Line Items]
Useful Life		3 years
Minimum [Member] \| Furniture and Fixtures [Member]
Significant Accounting Policies [Line Items]
Useful Life		5 years
Minimum [Member] \| Building [Member]
Significant Accounting Policies [Line Items]
Useful Life		15 years
Minimum [Member] \| Computer Software [Member]
Significant Accounting Policies [Line Items]
Useful Life		3 years
Minimum [Member] \| Machinery and Equipment [Member]
Significant Accounting Policies [Line Items]
Useful Life		2 years
Minimum [Member] \| Customer Relationships [Member]
Significant Accounting Policies [Line Items]
Definite-lived intangible assets, useful life		2 years
Minimum [Member] \| Developed Technology [Member]
Significant Accounting Policies [Line Items]
Definite-lived intangible assets, useful life		13 years
Maximum [Member]
Significant Accounting Policies [Line Items]
Remaining lease term operating and finance lease		15 years
Maximum [Member] \| Computer Equipment [Member]
Significant Accounting Policies [Line Items]
Useful Life		5 years
Maximum [Member] \| Furniture and Fixtures [Member]
Significant Accounting Policies [Line Items]
Useful Life		7 years
Maximum [Member] \| Building [Member]
Significant Accounting Policies [Line Items]
Useful Life		30 years
Maximum [Member] \| Computer Software [Member]
Significant Accounting Policies [Line Items]
Useful Life		7 years
Maximum [Member] \| Machinery and Equipment [Member]
Significant Accounting Policies [Line Items]
Useful Life		15 years
Maximum [Member] \| Customer Relationships [Member]
Significant Accounting Policies [Line Items]
Definite-lived intangible assets, useful life		20 years
Maximum [Member] \| Developed Technology [Member]
Significant Accounting Policies [Line Items]
Definite-lived intangible assets, useful life		20 years
Gross Sales [Member] \| Concentration Risk On Two Customers [Member]
Significant Accounting Policies [Line Items]
Number of customers accounted for significant percentage of net sales \| Customer		2	2	2
Revenue from Contract with Customer, Excluding Assessed Tax		$ 547,800,000	$ 495,800,000	$ 370,300,000
Gross Sales [Member] \| Geographic Concentration Risk [Member] \| Operating Segments [Member]
Significant Accounting Policies [Line Items]
Concentration risk, percentage		10%	10%	10%

Nature of Operations (Narrative

Nature of Operations (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Gain related to sale of fixed and intangible assets	$ 0	$ 0	$ 21
Idled Plant
Segment Reporting Information [Line Items]
Gain related to sale of fixed and intangible assets			$ 21
WAVE [Member]
Segment Reporting Information [Line Items]
Equity interest percentage	50%	50%

Nature of Operations (Schedule

Nature of Operations (Schedule of Net Sales to External Customers) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Net sales	$ 1,233.1	$ 1,106.6	$ 936.9
Equity (earnings) from joint venture	(77.6)	(87.7)	(64)
Segment operating income (loss)	278.7	260	254.8
Segment assets	1,687.2	1,710	1,718.5
Depreciation and amortization	83.7	96.5	84
Investment in joint venture	23.9	50	41.2
Purchases of property, plant and equipment	74.8	79.8	55.4
Mineral Fiber [Member]
Segment Reporting Information [Line Items]
Net sales	887.4	818.5	726
Equity (earnings) from joint venture	(77.6)	(87.7)	(64)
Segment operating income (loss)	260.9	261.2	218.7
Segment assets	1,096.9	1,133.9	1,101.1
Depreciation and amortization	69.5	69.9	71.8
Investment in joint venture	23.9	50	41.2
Purchases of property, plant and equipment	63.8	64.8	45.5
Architectural Specialties [Member]
Segment Reporting Information [Line Items]
Net sales	345.7	288.1	210.9
Segment operating income (loss)	21.7	4.2	22.3
Segment assets	387.5	366.3	357.7
Depreciation and amortization	14.2	26.6	12.2
Purchases of property, plant and equipment	11	15	9.9
Unallocated Corporate [Member]
Segment Reporting Information [Line Items]
Segment operating income (loss)	(3.9)	(5.4)	13.8
Segment assets	$ 202.8	$ 209.8	$ 259.7

Nature of Operations (Reconcili

Nature of Operations (Reconciliation Of Total Consolidated Operating Income To Earnings Before Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Total consolidated operating income	$ 278.7	$ 260	$ 254.8
Interest expense	27.1	22.9	24.1
Other non-operating (income) expense, net	(6)	(5.6)	357.4
Earnings (loss) from continuing operations before income taxes	$ 257.6	$ 242.7	$ (126.7)

Nature of Operations (Schedul_2

Nature of Operations (Schedule Of Sales Allocated To Geographic Area) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	$ 1,233.1	$ 1,106.6	$ 936.9
Mineral Fiber [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	887.4	818.5	726
Mineral Fiber [Member] \| United States [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	816.3	754.2	674.1
Mineral Fiber [Member] \| Canada [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	71.1	64.3	51.9
Architectural Specialties [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	345.7	288.1	210.9
Architectural Specialties [Member] \| United States [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	322.1	268	192.8
Architectural Specialties [Member] \| Canada [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Net sales	$ 23.6	$ 20.1	$ 18.1

Nature of Operations (Schedul_3

Nature of Operations (Schedule Of Property, Plant And Equipment Allocated To Geographic Area) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Revenues From External Customers And Long Lived Assets [Line Items]
Property, plant, and equipment, net	$ 554.4	$ 542.8
Mineral Fiber [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Property, plant, and equipment, net	496.8	490.6
Mineral Fiber [Member] \| United States [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Property, plant, and equipment, net	496.8	490.6
Architectural Specialties [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Property, plant, and equipment, net	57.6	52.2
Architectural Specialties [Member] \| United States [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Property, plant, and equipment, net	52.3	46.5
Architectural Specialties [Member] \| Canada [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Property, plant, and equipment, net	$ 5.3	$ 5.7

Revenue (Schedule of Net Sales

Revenue (Schedule of Net Sales by Major Customer Group within Each Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Entity Wide Revenue Major Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 1,233.1	$ 1,106.6	$ 936.9
Mineral Fiber [Member]
Entity Wide Revenue Major Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	887.4	818.5	726
Mineral Fiber [Member] \| Distributors [Member]
Entity Wide Revenue Major Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	654.1	603.9	525.2
Mineral Fiber [Member] \| Home Centers [Member]
Entity Wide Revenue Major Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	99.1	94.4	96.1
Mineral Fiber [Member] \| Direct Customers [Member]
Entity Wide Revenue Major Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	61	59.2	54.3
Mineral Fiber [Member] \| Retailers And Other
Entity Wide Revenue Major Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	73.2	61	50.4
Architectural Specialties [Member]
Entity Wide Revenue Major Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	345.7	288.1	210.9
Architectural Specialties [Member] \| Distributors [Member]
Entity Wide Revenue Major Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	174.4	150.5	135.5
Architectural Specialties [Member] \| Direct Customers [Member]
Entity Wide Revenue Major Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	168	134.6	73.3
Architectural Specialties [Member] \| Retailers And Other
Entity Wide Revenue Major Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 3.3	$ 3	$ 2.1

Acquisitions (Narrative) (Detai

Acquisitions (Narrative) (Details) - USD ($) $ in Millions	Nov. 04, 2022	Dec. 16, 2020	Aug. 24, 2020	Jul. 27, 2020	Dec. 31, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Business acquisition, goodwill					$ 167.3	$ 167
Business combination, consideration transferred estimated fair value					$ 15.2	$ 8.6
GC Products, Inc. [Member]
Business Acquisition [Line Items]
Payments to acquire business	$ 2.8
Business acquisition, total fair value of liabilities assumed, less tangible assets acquired	0.3
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	1.8
Business acquisition, goodwill	0.7
GC Products, Inc. [Member] \| Non-compete Agreements [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	0.2
GC Products, Inc. [Member] \| Technology [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	0.7
GC Products, Inc. [Member] \| Customer Relationships [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 0.6
Arktura [Member]
Business Acquisition [Line Items]
Payments to acquire business		$ 91.2
Business acquisition, cash acquired		0.1
Business acquisition, total fair value of liabilities assumed, less tangible assets acquired		0.9
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		33
Business acquisition, goodwill		$ 57.4
Estimated Useful Life		4 years 3 months 18 days
Arktura [Member] \| Patents [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		$ 0.6
Arktura [Member] \| Patents [Member] \| Maximum [Member]
Business Acquisition [Line Items]
Estimated Useful Life		19 years
Arktura [Member] \| Non-compete Agreements [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		$ 2.1
Estimated Useful Life		5 years
Arktura [Member] \| Seller [Member]
Business Acquisition [Line Items]
Business acquisition additional cash payments		$ 24
Business acquisition cash payment period		5 years
Arktura [Member] \| Seller [Member] \| Restricted Stock [Member]
Business Acquisition [Line Items]
Business acquisition, stock issued or issuable		$ 6
Business acquisition stock issued vesting period		5 years
Arktura [Member] \| Key Employee [Member] \| Restricted Stock [Member]
Business Acquisition [Line Items]
Business acquisition, stock issued or issuable		$ 1.4
Business acquisition stock issued vesting period		3 years
Moz Designs, Inc. [Member]
Business Acquisition [Line Items]
Payments to acquire business			$ 4.2
Business acquisition, total fair value of liabilities assumed, less tangible assets acquired			0.4
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			2.7
Business acquisition, goodwill			4.6
Business combination contingent consideration maximum earnout payable			4.7
Business combination, consideration transferred estimated fair value			2.7
Business combination, consideration transferred			6.9
Moz Designs, Inc. [Member] \| TradeNames [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			1.5
Moz Designs, Inc. [Member] \| Customer Relationships [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			0.6
Moz Designs, Inc. [Member] \| Backlog [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			$ 0.6
Turf [Member]
Business Acquisition [Line Items]
Payments to acquire business				$ 70
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill				27.9
Business acquisition, goodwill				$ 51.4
Estimated Useful Life				8 years 3 months 18 days
Business combination contingent consideration maximum earnout payable				$ 48
Business combination, consideration transferred estimated fair value				14.1
Business combination, consideration transferred				84.1
Business acquisition, total fair value of tangible assets acquired, less liabilities assumed				4.8
Turf [Member] \| Patents [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill				$ 5.8
Estimated Useful Life				20 years
Turf [Member] \| Non-compete Agreements [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill				$ 3.3
Estimated Useful Life				5 years
Turf [Member] \| Target Payout [Member]
Business Acquisition [Line Items]
Additional cash considerations				$ 24
Turf [Member] \| TradeNames [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill				9.6
Turf [Member] \| Customer Relationships [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill				$ 7.7
Estimated Useful Life				2 years

Acquisitions - Schedule Of Fair

Acquisitions - Schedule Of Fair Values of Identifiable Intangible Assets Acquired and Estimated Useful Lives (Details) - Arktura [Member] $ in Millions	Dec. 16, 2020 USD ($)
Business Acquisition [Line Items]
Fair Value at Acquisition Date	$ 33
Estimated Useful Life	4 years 3 months 18 days
TradeNames [Member]
Business Acquisition [Line Items]
Fair Value at Acquisition Date	$ 12.1
Non-amortizing intangible assets, estimated useful life	Indefinite
Software [Member]
Business Acquisition [Line Items]
Fair Value at Acquisition Date	$ 9.1
Estimated Useful Life	7 years
Backlog [Member]
Business Acquisition [Line Items]
Fair Value at Acquisition Date	$ 5.5
Estimated Useful Life	1 year
Customer Relationships [Member]
Business Acquisition [Line Items]
Fair Value at Acquisition Date	$ 3.6
Estimated Useful Life	1 year
Non-compete Agreements [Member]
Business Acquisition [Line Items]
Fair Value at Acquisition Date	$ 2.1
Estimated Useful Life	5 years
Patents [Member]
Business Acquisition [Line Items]
Fair Value at Acquisition Date	$ 0.6
Patents [Member] \| Minimum [Member]
Business Acquisition [Line Items]
Estimated Useful Life	13 years
Patents [Member] \| Maximum [Member]
Business Acquisition [Line Items]
Estimated Useful Life	19 years

Acquisitions (Schedule of Acqui

Acquisitions (Schedule of Acquisitions) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Business Combinations [Abstract]
Net sales from continuing operations, pro forma (unaudited)			$ 1,009
Net sales	$ 1,233.1	$ 1,106.6	936.9
Net loss from continuing operations, pro forma (unaudited)			(69.2)
Net (loss) earnings from continuing operations before income taxes	$ 199.9	$ 185.3	$ (84.1)

Discontinued Operations (Narrat

Discontinued Operations (Narrative) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net loss due to change in carrying value of discontinued operations net assets		$ 3	$ (2.1)	$ (15)
Net loss due to change in carrying value of discontinued operations net assets		0	(0.4)	(16.4)
Income tax (benefit) expense		(3)	1.7	(1.4)
Loss from disposal of discontinued businesses, before income tax		0	(0.4)	(16.4)
Valuation loss on pension liabilities			11.8
EMEA and Pacific Rim Business [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net loss due to change in carrying value of discontinued operations net assets		2	(2.1)	(15.8)
Net loss due to change in carrying value of discontinued operations net assets		0	(0.4)	(17.2)
Income tax (benefit) expense		(2)	1.7	(1.4)
Loss from disposal of discontinued businesses, before income tax		0	$ (0.4)	(17.2)
Valuation loss on pension liabilities				11.4
European Resilient Flooring [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Gain related to accumulated other comprehensive income adjustment from discontinued foreign entity	[1]			$ 0.8
Armstrong Flooring Inc [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Income tax (benefit) expense		$ (1)

[1] Represents AOCI adjustments related to accumulated foreign currency translation amounts.

Discontinued Operations (Schedu

Discontinued Operations (Schedule of Business Details and Line Items Comprising Discontinued Operations on Statements of Earnings and Comprehensive Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Loss from disposal of discontinued businesses, before income tax	$ 0	$ (0.4)	$ (16.4)
Income tax (benefit) expense	(3)	1.7	(1.4)
(Loss) gain from disposal of discontinued businesses, net of tax	3	(2.1)	(15)
Net earnings (loss) from discontinued operations	3	(2.1)	(15)
EMEA and Pacific Rim Business [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Loss from disposal of discontinued businesses, before income tax	0	(0.4)	(17.2)
Income tax (benefit) expense	(2)	1.7	(1.4)
(Loss) gain from disposal of discontinued businesses, net of tax	2	(2.1)	(15.8)
Net earnings (loss) from discontinued operations	2	$ (2.1)	(15.8)
Flooring Businesses [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Loss from disposal of discontinued businesses, before income tax	0		0.8
Income tax (benefit) expense	(1)		0
(Loss) gain from disposal of discontinued businesses, net of tax	1		0.8
Net earnings (loss) from discontinued operations	$ 1		$ 0.8

Discontinued Operations (Summar

Discontinued Operations (Summary of Total Gains and Losses, Capital Expenditures and Operating Lease) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net loss due to change in carrying value of discontinued operations net assets		$ 0	$ (0.4)	$ (16.4)
Income tax (benefit) expense		(3)	1.7	(1.4)
EMEA and Pacific Rim Business [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net loss due to change in carrying value of discontinued operations net assets		0	(0.4)	(17.2)
Income tax (benefit) expense		$ (2)	1.7	(1.4)
European Resilient Flooring [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Gain on dissolution of flooring entity	[1]			(0.8)
Knauf [Member] \| EMEA and Pacific Rim Business [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Loss on sale to Knauf	[2]		$ 0.4	$ 17.2

[1] Represents AOCI adjustments related to accumulated foreign currency translation amounts. Represents certain pension liabilities, working capital and other adjustments.

Accounts and Notes Receivable_2

Accounts and Notes Receivable (Schedule of Accounts and Notes Receivable) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Receivables [Abstract]
Customer receivables	$ 107.4	$ 104.7
Miscellaneous receivables	8.2	7.9
Less allowance for warranties, discounts and losses	(3.2)	(3.5)
Accounts and notes receivable, net	$ 112.4	$ 109.1

Accounts and Notes Receivable_3

Accounts and Notes Receivable (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounts Notes And Loans Receivable [Line Items]
Employee retention credit receivable			$ 5.9
Employee Retention Credit [Member]
Accounts Notes And Loans Receivable [Line Items]
Employee retention credit receivable		$ 4.8	$ 5.9
Employee Retention Credit [Member] \| Subsequent Event [Member]
Accounts Notes And Loans Receivable [Line Items]
Employee retention credit received	$ 4.1

Inventories (Schedule of Invent

Inventories (Schedule of Inventories) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Inventory Disclosure [Abstract]
Finished goods	$ 60.9	$ 49.9
Goods in process	6.5	6.4
Raw materials and supplies	63	48.4
Less LIFO reserves	(20.4)	(14.5)
Total inventories, net	$ 110	$ 90.2

Inventories (Narrative) (Detail

Inventories (Narrative) (Details)	Dec. 31, 2022	Dec. 31, 2021
Inventory Disclosure [Abstract]
Percent of inventory valued on a LIFO basis	58%	66%

Inventories (Summary Of Invento

Inventories (Summary Of Inventory Not Accounted For Under LIFO) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
FIFO inventory	$ 46.3	$ 30.7
U.S. Locations [Member]
Segment Reporting Information [Line Items]
FIFO inventory	43.2	28
Canada Locations [Member]
Segment Reporting Information [Line Items]
FIFO inventory	$ 3.1	$ 2.7

Other Current Assets (Schedule

Other Current Assets (Schedule of Other Current Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid expenses	$ 16.6	$ 17.2
Assets held for sale	4.6	4.6
Fair value of derivative assets	3.7	0
Other	1.4	1.3
Total other current assets	$ 26.3	$ 23.1

Property, Plant And Equipment_2

Property, Plant And Equipment (Schedule Of Property, Plant And Equipment) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Abstract]
Land	$ 31.8	$ 31.8
Buildings	267.8	257.2
Machinery and equipment	686.1	643.9
Computer software	69.2	52.6
Construction in progress	49	51.3
Less accumulated depreciation and amortization	(549.5)	(494)
Net property, plant and equipment	$ 554.4	$ 542.8

Equity Investments (Narrative)

Equity Investments (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Distributions from equity interest	$ 104.5	$ 78.3	$ 81.5
Equity method investment, sales reported on consolidated financial statements	$ 47.3	$ 42.3	35.2
WAVE [Member]
Schedule of Equity Method Investments [Line Items]
Equity interest percentage	50%	50%
Distributions from equity interest	$ 104.5	$ 78.3	$ 81.5
Percentage of difference in carrying value of investment recorded in discontinued operation	50%
Equity method investment, difference between carrying amount and underlying equity	$ 132.2	$ 136.4
WAVE [Member] \| Customer Relationships [Member]
Schedule of Equity Method Investments [Line Items]
Amortizing intangible assets, Estimated Useful Life	20 years
WAVE [Member] \| Trademarks [Member]
Schedule of Equity Method Investments [Line Items]
Non-amortizing intangible assets, estimated useful life	indefinite

Equity Investments (Summary of

Equity Investments (Summary of Investment in Joint Venture, Balance Sheet Data) (Details) - USD ($) $ in Millions		Dec. 31, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Current assets		$ 356.5	$ 321.9
Current liabilities		182.7	209.6
Other non-current liabilities		969.5	980.7
WAVE [Member] \| Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Schedule of Equity Method Investments [Line Items]
Current assets		100.8	119.7
Non-current assets	[1]	86.3	42.1
Current liabilities	[1]	31.3	37.1
Other non-current liabilities	[1]	$ 372.3	$ 297.4

[1] Includes initial ROU assets and lease liabilities of $ 29.4 million recognized upon adoption of Accounting Standards Codification Topic 842 – Leases on January 1, 2022.

Equity Investments - (Summary o

Equity Investments - (Summary of Investment in Joint Venture, Balance Sheet Data) (Parenthetical) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
ROU assets	$ 18.8	$ 21
Lease liabilities	19.1
WAVE [Member] \| Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Schedule of Equity Method Investments [Line Items]
ROU assets	29.4	29.4
Lease liabilities	$ 29.4	$ 29.4

Equity Investments (Summary o_2

Equity Investments (Summary of Investment in Joint Venture, Income Statement Data) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Net sales	$ 1,233.1	$ 1,106.6	$ 936.9
Gross profit	449.1	405.6	333.1
Net earnings	202.9	183.2	(99.1)
WAVE [Member] \| Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Schedule of Equity Method Investments [Line Items]
Net sales	458.2	430.8	343.3
Gross profit	231.1	244.5	194.7
Net earnings	$ 163.7	$ 184.6	$ 137.8

Equity Investments (Summary o_3

Equity Investments (Summary of the Difference Between Carrying Amount and Underlying Equity of Equity Method Investment) (Details) - WAVE [Member] - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Total of fair value adjustments to assets	$ 132.2	$ 136.4
Property, Plant and Equipment [Member]
Schedule of Equity Method Investments [Line Items]
Total of fair value adjustments to assets	0.4	0.4
Other Intangibles [Member]
Schedule of Equity Method Investments [Line Items]
Total of fair value adjustments to assets	101.4	105.6
Goodwill [Member]
Schedule of Equity Method Investments [Line Items]
Total of fair value adjustments to assets	$ 30.4	$ 30.4

Leases (Schedule of Lease Costs

Leases (Schedule of Lease Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Lease, Cost [Abstract]
Operating lease cost	$ 7	$ 6.4	$ 5.6
Finance lease cost
Amortization of leased assets	2.4	2.4	2
Interest on lease liabilities	0.6	0.7	0.6
Total finance lease cost	$ 3	$ 3.1	$ 2.6

Leases (Narrative) (Details)

Leases (Narrative) (Details)	12 Months Ended
Leases (Narrative) (Details)	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Short term lease expense description	not material	not material	not material
Variable lease cost description	not material
Material lease description	As of December 31, 2022, we did not have any material leases that have not yet commenced.

Leases (Summary of Supplemental

Leases (Summary of Supplemental Cash Flow Information Related to Leases) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases		$ 6.8	$ 6.3	$ 5.4
Operating cash flows from finance leases		0.6	0.7	0.6
Payments for finance leases		2.2	2.1	1.8
ROU assets obtained in exchange for lease liabilities
Operating leases	[1]	3.9	7.3	5.4
Finance leases		$ 0	$ 0.3	$ 2.6

[1] The years ended December 31, 2022, 2021 and 2020 include increases in ROU assets of $ 1.0 million, $ 3.2 million and $ 0.4 million, respectively, resulting from modifications that did not involve obtaining a new ROU asset. Modifications resulted primarily from changes in the terms of existing leases.

Leases (Summary of Supplement_2

Leases (Summary of Supplemental Cash Flow Information Related to Leases) (Parenthetical) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Lease, Cost [Abstract]
ROU assets	$ 1	$ 3.2	$ 0.4
Operating lease assets	$ 18.8	$ 21

Leases (Schedule of Weighted Av

Leases (Schedule of Weighted Average Assumptions Used To Compute ROU Assets and Lease Liabilities) (Details)	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Weighted average remaining lease term, Operating leases	5 years 1 month 6 days	5 years 4 months 24 days
Weighted average remaining lease term, Finance leases	9 years 4 months 24 days	9 years 10 months 24 days
Weighted average discount rate, Operating leases	3.80%	3.40%
Weighted average discount rate, Finance leases	3.70%	3.60%

Leases (Schedule of Undiscounte

Leases (Schedule of Undiscounted Future Minimum Payments) (Details) $ in Millions	Dec. 31, 2022 USD ($)
Maturity of lease liabilities
2023	$ 6.5
2024	4.8
2025	2.9
2026	1.7
2027	1.6
Thereafter	3.9
Total lease payments	21.4
Less interest	(2.3)
Present value of lease liabilities	19.1
Maturity of lease liabilities
2023	2.8
2024	2.6
2025	2.3
2026	2.4
2027	2.5
Thereafter	7.6
Total lease payments	20.2
Less interest	(3.4)
Present value of lease liabilities	$ 16.8

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible asset impairment	$ 0	$ 0	$ 0

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets (Schedule of Goodwill and Intangible Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Schedule Of Intangible Assets And Goodwill [Line Items]
Goodwill, Estimated Useful Life	Indefinite
Amortizing intangible assets, Gross Carrying Amount	$ 295.9	$ 308.7
Amortizing intangible assets, Accumulated Amortization	233.2	232.2
Non-amortizing intangible assets	345	344.9
Total intangible assets	640.9	653.6
Goodwill	$ 167.3	167
Trademarks And Brand Names [Member]
Schedule Of Intangible Assets And Goodwill [Line Items]
Non-amortizing intangible assets, Estimated Useful Life	Indefinite
Customer Relationships [Member]
Schedule Of Intangible Assets And Goodwill [Line Items]
Amortizing intangible assets, Gross Carrying Amount	$ 182.1	196.7
Amortizing intangible assets, Accumulated Amortization	$ 142	144.8
Customer Relationships [Member] \| Minimum [Member]
Schedule Of Intangible Assets And Goodwill [Line Items]
Amortizing intangible assets, Estimated Useful Life	2 years
Customer Relationships [Member] \| Maximum [Member]
Schedule Of Intangible Assets And Goodwill [Line Items]
Amortizing intangible assets, Estimated Useful Life	20 years
Developed Technology [Member]
Schedule Of Intangible Assets And Goodwill [Line Items]
Amortizing intangible assets, Gross Carrying Amount	$ 93.8	92.9
Amortizing intangible assets, Accumulated Amortization	$ 83.3	82.6
Developed Technology [Member] \| Minimum [Member]
Schedule Of Intangible Assets And Goodwill [Line Items]
Amortizing intangible assets, Estimated Useful Life	13 years
Developed Technology [Member] \| Maximum [Member]
Schedule Of Intangible Assets And Goodwill [Line Items]
Amortizing intangible assets, Estimated Useful Life	20 years
Software [Member]
Schedule Of Intangible Assets And Goodwill [Line Items]
Amortizing intangible assets, Estimated Useful Life	7 years
Amortizing intangible assets, Gross Carrying Amount	$ 9.1	9.1
Amortizing intangible assets, Accumulated Amortization	2.6	1.3
Trademarks And Brand Names [Member]
Schedule Of Intangible Assets And Goodwill [Line Items]
Amortizing intangible assets, Gross Carrying Amount	4	4
Amortizing intangible assets, Accumulated Amortization	$ 2.6	2
Trademarks And Brand Names [Member] \| Minimum [Member]
Schedule Of Intangible Assets And Goodwill [Line Items]
Amortizing intangible assets, Estimated Useful Life	3 years
Trademarks And Brand Names [Member] \| Maximum [Member]
Schedule Of Intangible Assets And Goodwill [Line Items]
Amortizing intangible assets, Estimated Useful Life	10 years
Non-compete Agreements [Member]
Schedule Of Intangible Assets And Goodwill [Line Items]
Amortizing intangible assets, Gross Carrying Amount	$ 5.8	5.6
Amortizing intangible assets, Accumulated Amortization	$ 2.6	1.4
Non-compete Agreements [Member] \| Minimum [Member]
Schedule Of Intangible Assets And Goodwill [Line Items]
Amortizing intangible assets, Estimated Useful Life	3 years
Non-compete Agreements [Member] \| Maximum [Member]
Schedule Of Intangible Assets And Goodwill [Line Items]
Amortizing intangible assets, Estimated Useful Life	5 years
Other [Member]
Schedule Of Intangible Assets And Goodwill [Line Items]
Amortizing intangible assets, Estimated Useful Life	Various
Amortizing intangible assets, Gross Carrying Amount	$ 1.1	0.4
Amortizing intangible assets, Accumulated Amortization	$ 0.1	$ 0.1

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets (Schedule of Amortization Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 16.3	$ 33.8	$ 22.1

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets (Schedule of Expected Annual Amortization Expense) (Details) $ in Millions	Dec. 31, 2022 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2023	$ 13.9
2024	13.4
2025	12.7
2026	9.2
2027	$ 3.1

Other Non-Current Assets (Detai

Other Non-Current Assets (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Other Assets, Noncurrent Disclosure [Abstract]
Cash surrender value of company-owned life insurance policies	$ 42.8	$ 47.2
Investment in employee deferred compensation plans	7.7	9.7
Fair value of derivative assets	7.7	0
Other	1.2	1
Total other non-current assets	$ 59.4	$ 57.9

Accounts Payable And Accrued _3

Accounts Payable And Accrued Expenses (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Schedule Of Accounts Payble And Accrued Expenses [Line Items]
Payables, trade and other	$ 105	$ 105.8
Employment costs	20	30.3
Current portion of pension and postretirement liabilities	9.9	9.9
Acquisition-related contingent consideration	15.2	8.6
Other	22.4	20.3
Total accounts payable and accrued expenses	$ 172.5	$ 174.9

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
Income Taxes (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Taxes [Line Items]
Valuation allowances	$ 48.7	$ 60.6
Unremitted earnings not taxed	17.7	13
Income tax reconciliation foreign withholding taxes	0.9	0.7
Unrecognized tax benefits	27.3	35.6	$ 41.7	$ 34.7
UTB if recognized, would impact the reported effective tax rate	11.5
UTB if recognized, would impact the reported effective tax rate, net of federal benefit	10.6
Interest and penalties reported as accrued income tax	1.7
Employee retention credit receivable		5.9
Capital Loss Carryforward [Member]
Income Taxes [Line Items]
Capital loss carryforwards	$ 18.8	18.8
Minimum [Member]
Income Taxes [Line Items]
Number of open tax years subject to audit	3 years
Maximum [Member]
Income Taxes [Line Items]
Number of open tax years subject to audit	6 years
State [Member]
Income Taxes [Line Items]
Operating loss carryforwards	$ 675.5	700.9
Valuation allowances	28
Estimated future taxable income to utilize deferred tax assets	360.1
Estimated future capital gain to realize capital loss carryforwards	$ 184.6
Estimated future capital gain to realize capital loss carryforwards, expiration year	2024
UTB decrease due to uncertain tax positions	$ 0.1
State [Member] \| State Tax Credits [Member]
Income Taxes [Line Items]
Valuation allowances	$ 3.3
State [Member] \| Minimum [Member]
Income Taxes [Line Items]
Operating loss carryforwards, expiration date	2023
State [Member] \| Maximum [Member]
Income Taxes [Line Items]
Operating loss carryforwards, expiration date	2042
Estimated future capital gain to realize capital loss carryforwards, expiration year	2036
Federal [Member]
Income Taxes [Line Items]
Estimated future capital gain to realize capital loss carryforwards	$ 66.4
Federal [Member] \| Minimum [Member]
Income Taxes [Line Items]
Estimated future capital gain to realize capital loss carryforwards, expiration year	2024
Federal [Member] \| Maximum [Member]
Income Taxes [Line Items]
Estimated future capital gain to realize capital loss carryforwards, expiration year	2026
Foreign Tax Credit [Member]
Income Taxes [Line Items]
Capital loss carryforwards		$ 0.6
Federal and State [Member] \| Capital Loss Carryforward [Member]
Income Taxes [Line Items]
Valuation allowances	$ 17.4

Income Taxes (Schedule Of Defer

Income Taxes (Schedule Of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Net operating losses	$ 34.2	$ 42.5
Postretirement benefits	16.7	20.7
Pension benefit liabilities	8.2	11
Deferred compensation	7.1	7.9
Foreign tax credit carryforwards	0	0.6
State tax credit carryforwards	4.7	8.7
Capital loss carryforwards	18.8	18.8
Capitalized research expenses	9.4	0
Lease right-of-use liabilities	9.7	9.8
Other	3.8	12.3
Total deferred income tax assets	112.6	132.3
Valuation allowances	(48.7)	(60.6)
Net deferred income tax assets	63.9	71.7
Intangibles	(85.1)	(87.4)
Partnerships and investments	(25.5)	(26.4)
Accumulated depreciation	(86.4)	(80.4)
Prepaid pension costs	(21.2)	(27.8)
Inventories	(4.9)	(4.9)
Lease right-of-use assets	(9.9)	(10.1)
Other	(0.3)	(1.6)
Total deferred income tax liabilities	(233.3)	(238.6)
Net deferred income tax liabilities	$ (169.4)	$ (166.9)

Income Taxes (Schedule Of Incom

Income Taxes (Schedule Of Income Tax Expense (Benefit)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Earnings (loss) before income taxes, Domestic	$ 251.7	$ 239.3	$ (130)
Earnings (loss) before income taxes, Foreign	5.9	3.4	3.3
Earnings (loss) from continuing operations before income taxes	257.6	242.7	(126.7)
Current income tax expense (benefit), Federal	46.3	39.4	40.8
Current income tax expense (benefit), Foreign	1.3	0.6	1
Current income tax expense (benefit), State	11.3	8.7	5.6
Current income tax expense (benefit), Total	58.9	48.7	47.4
Deferred income tax expense (benefit), Federal	(1.9)	3.6	(75.5)
Deferred income tax expense (benefit), Foreign	(0.2)	0.6	0
Deferred income tax expense (benefit), State	0.9	4.5	(14.5)
Deferred income tax expense (benefit), Total	(1.2)	8.7	(90)
Tax expense (benefit) at effective rate	$ 57.7	$ 57.4	$ (42.6)

Income Taxes (Schedule Of The R

Income Taxes (Schedule Of The Reconciliation To U.S. Statutory Tax Rate) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Continuing operations tax expense (benefit) at statutory rate	$ 54.1	$ 51	$ (26.6)
Decrease in valuation allowances on deferred income tax assets	(1.7)	(17.8)	(0.1)
Expiration of deferred income tax assets	0.7	18.3	0
State income tax expense (benefit), net of federal impact	11	11	(7.3)
Capital loss on sale of investment	0	0	(4.6)
Statute closures	(5.1)	(3.8)	(1.3)
State deferred tax adjustments	0	0	(1.5)
Excess tax benefits on share-based compensation	(0.5)	(0.8)	(0.9)
U.S. permanent differences	(0.8)	(1.3)	(2.2)
Other	0	0.8	1.9
Tax expense (benefit) at effective rate	$ 57.7	$ 57.4	$ (42.6)

Income Taxes (Schedule Of Unrec

Income Taxes (Schedule Of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Unrecognized tax benefits balance at January 1,	$ 35.6	$ 41.7	$ 34.7
Gross change for current year positions	0.4	1.7	2.3
Increases for prior period positions	0.2	0	8.7
Decrease for prior period positions	(1.4)	(3.6)	0
Decrease due to statute expirations	(7.5)	(4.2)	(4)
Unrecognized tax benefits balance at December 31,	$ 27.3	$ 35.6	$ 41.7

Income Taxes (Schedule Of Other

Income Taxes (Schedule Of Other Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Payroll taxes	$ 18.3	$ 13.4	$ 15.6
Property, franchise and capital stock taxes	$ 4.5	$ 4.4	$ 4.2

Debt (Schedule Of Debt) (Detail

Debt (Schedule Of Debt) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Principal debt outstanding	$ 655	$ 633.7
Unamortized debt financing costs	(3.9)	(2.3)
Current installments of long-term debt	0	25
Long-term debt, less current installments	651.1	606.4
Revolving Credit Facility Due 2027 [Member]
Debt Instrument [Line Items]
Principal debt outstanding	205	0
Revolving Credit Facility Due 2024 [Member]
Debt Instrument [Line Items]
Principal debt outstanding	0	165
Term Loan A Due 2027 [Member]
Debt Instrument [Line Items]
Principal debt outstanding	450	0
Term Loan A Due 2024 [Member]
Debt Instrument [Line Items]
Principal debt outstanding	0	468.7
Long-term Debt [Member]
Debt Instrument [Line Items]
Long-term debt	651.1	631.4
Short-term Debt [Member]
Debt Instrument [Line Items]
Current installments of long-term debt	0	25
Long-Term Debt, Less Current Portion [Member]
Debt Instrument [Line Items]
Long-term debt, less current installments	$ 651.1	$ 606.4

Debt (Narrative) (Details)

Debt (Narrative) (Details) $ in Millions	12 Months Ended
Debt (Narrative) (Details) $ in Millions	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 07, 2022 USD ($)
Debt Instrument [Line Items]
Bank, legal and other fees	$ 3.1
Amount capitalized and recorded as a component of long-term debt	3
Basis point SOFR adjustment				10
Unamortized debt financing costs wrote off	0.6	$ 0	$ 0
Letter of Credit [Member]
Debt Instrument [Line Items]
Credit facility amount	8.1
Line of credit availability	175
Term Loan A [Member]
Debt Instrument [Line Items]
Line of credit availability				$ 450
Bi-lateral Facility [Member] \| Letter of Credit [Member]
Debt Instrument [Line Items]
Credit facility amount	8.1
Line of credit availability	$ 25
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit availability				$ 500
Maturity date	Sep. 30, 2024
Revolving Credit Facility [Member] \| Letter of Credit [Member]
Debt Instrument [Line Items]
Line of credit availability	$ 150
Revolving Credit Facility [Member] \| Term Loan A [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Interest rate				1.50%
Revolving Credit Facility [Member] \| Term Loan A [Member] \| SOFR [Member]
Debt Instrument [Line Items]
Interest rate				1.625%
Refinanced Senior Credit Facility [Member]
Debt Instrument [Line Items]
Financial covenants	The amended senior secured credit facility includes two financial covenants that require the ratio of consolidated EBITDA to consolidated cash interest expense minus cash consolidated interest income to be greater than or equal to 3.0 to 1.0 and requires the ratio of consolidated funded indebtedness, minus AWI and domestic subsidiary unrestricted cash and cash equivalents up to $100 million, to consolidated EBITDA to be less than or equal to 3.75 to 1.0 (subject to certain exceptions for certain acquisitions).
Maximum unrestricted cash and cash equivalents for leverage ratio calculation	$ 100
Refinanced Senior Credit Facility [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Ratio of EBITDA to consolidated cash interest expense minus cash consolidated interest income	3
Refinanced Senior Credit Facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Ratio of consolidated funded indebtedness, minus unrestricted cash and cash equivalents	3.75
Senior Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility amount				$ 1,000
Amended Senior Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit availability				950
Amended Senior Credit Facility [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit availability				$ 150
Maturity date	Dec. 31, 2027

Debt (Scheduled Payments Of Lon

Debt (Scheduled Payments Of Long-Term Debt) (Details) $ in Millions	Dec. 31, 2022 USD ($)
Debt Disclosure [Abstract]
2023	$ 0
2024	22.5
2025	22.5
2026	22.5
2027	587.5
2028 and later	$ 0

Debt (Schedule of Letters of Cr

Debt (Schedule of Letters of Credit Facilities) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 07, 2022
Letter of Credit [Member]
Debt Instrument [Line Items]
Letters of credit, Limit	$ 175
Letters of credit, Used	8.1
Letters of credit, Available	166.9
Letter of Credit [Member] \| Bi-lateral Facility [Member]
Debt Instrument [Line Items]
Letters of credit, Limit	25
Letters of credit, Used	8.1
Letters of credit, Available	16.9
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Letters of credit, Limit		$ 500
Revolving Credit Facility [Member] \| Letter of Credit [Member]
Debt Instrument [Line Items]
Letters of credit, Limit	150
Letters of credit, Available	$ 150

Pension and Other Benefit Pro_3

Pension and Other Benefit Programs (Narrative) (Details) $ in Millions	3 Months Ended		12 Months Ended
	Sep. 30, 2020 USD ($)	Mar. 31, 2020 USD ($) Participant	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligations			$ 337.1	$ 435.1	$ 441.7
Fair value of plan assets			391.7	506.7	520.7
Non-U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation			$ 1.8	2.5
Defined Benefit Pension Plans [Member] \| Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Assumed rate of return forecast period			30 years
Defined Benefit Pension Plans [Member] \| Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Assumed rate of return forecast period			10 years
U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Settlement loss			$ 0	$ 0	(374.4)
Benefit obligation discount rate			5.21%	2.98%
Non-cash expense			$ 0	$ 0	$ 2
Accumulated benefit obligation			$ 335.7	$ 433.2
Long-term return forecast			3.75%	3.25%
U.S. Defined-Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial gain (loss) amortization period			26 years	27 years	28 years
U.S. Defined-Benefit Retiree Health And Life Insurance Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligations			$ 61.9	$ 78	$ 81.4
Fair value of plan assets			$ 0	$ 0
Benefit obligation discount rate			5.12%	2.72%
Average rate of annual increase in the per capita costs, pre-65			7.30%
Average rate of annual increase in the per capita costs, post-65			7.80%
Ultimate rate			4.50%
U.S. and Non-U.S. Plans [Member] \| Defined Contribution Benefit Plans [member]
Defined Benefit Plan Disclosure [Line Items]
Employee contributions, vested percentage			100%
Costs for defined contribution benefit plans			$ 8.4	$ 9.1	$ 8.1
Retirement Income Plan (RIP) [Member]
Defined Benefit Plan Disclosure [Line Items]
Settled benefit obligations		$ 1,045.3
Number of retirees and beneficiaries participants \| Participant		10,000
Settlement loss		$ 374.4
Projected benefit obligations		387.5
Fair value of plan assets		$ 499.6
Benefit obligation discount rate		3.07%				3.16%
Number of deferred vested and active participants \| Participant		3,000
Expected long-term return on plan assets		5.25%
Non-cash expense	$ 2

Pension and Other Benefit Pro_4

Pension and Other Benefit Programs (Schedule of Net Funded Status) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Benefit obligations as of beginning of period	$ 435.1	$ 441.7
Defined Benefit Plan, Service Cost	3.7	4.8
Defined Benefit Plan, Interest Cost	10.5	9
Actuarial (gain) loss	(99.8)	(10.9)
Benefits paid	(12.4)	(9.5)
Benefit obligations as of end of period	337.1	435.1	$ 441.7
Fair value of plan assets as of beginning of period	506.7	520.7
Actual return on plan assets	(105.4)	(7.4)
Employer contributions	2.8	2.9
Benefits paid	(12.4)	(9.5)
Fair value of plan assets as of end of period	391.7	506.7	520.7
Funded status	54.6	71.6
U.S. Defined-Benefit Retiree Health And Life Insurance Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligations as of beginning of period	78	81.4
Defined Benefit Plan, Interest Cost	1.5	1.2	1.9
Plan participants' contributions	1.6	1.9
Actuarial (gain) loss	(12.4)	2
Benefits paid	(6.8)	(8.5)
Benefit obligations as of end of period	61.9	78	$ 81.4
Fair value of plan assets as of beginning of period	0
Employer contributions	5.2	6.6
Plan participants' contributions	1.6	1.9
Benefits paid	(6.8)	(8.5)
Fair value of plan assets as of end of period	0	0
Funded status	$ (61.9)	$ (78)

Pension and Other Benefit Pro_5

Pension and Other Benefit Programs (Schedule of Assumptions Used) (Details)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation discount rate	5.21%	2.98%
Benefit obligation rate of compensation increase	3.33%	3.05%
Net periodic benefit cost discount rate	2.97%	2.67%
Net periodic benefit cost expected return on plan assets	3.75%	3.25%
Net periodic benefit cost rate of compensation increase	3.05%	3.05%
U.S. Defined-Benefit Retiree Health And Life Insurance Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation discount rate	5.12%	2.72%
Net periodic benefit cost discount rate	2.73%	2.35%

Pension and Other Benefit Pro_6

Pension and Other Benefit Programs (Schedule of Benefit Obligations in Excess of Assets) (Details) - RBEP [Member] - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
RBEP Projected benefit obligation, December 31	$ 28.6	$ 37.4
RBEP Accumulated benefit obligation, December 31	$ 28.6	$ 37.4

Pension and Other Benefit Pro_7

Pension and Other Benefit Programs (Schedule of Periodic Benefit Costs for U.S. Defined Benefit Pension Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Service cost of benefits earned during the period	$ 3.7	$ 4.8
Interest cost on projected benefit obligation	10.5	9
U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost of benefits earned during the period	3.7	4.8	$ 5.5
Interest cost on projected benefit obligation	10.5	9	15.5
Expected return on plan assets	$ (18.4)	$ (16.5)	$ (34.5)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax
Recognized net actuarial loss	$ 4.2	$ 3.5	$ 6.3
Settlement	0	0	374.4
Special termination benefits	0	0	2
Net periodic postretirement benefit (credit)	$ 0	$ 0.8	$ 369.2

Pension and Other Benefit Pro_8

Pension and Other Benefit Programs (Schedule of Defined Asset Allocation) (Details)	Dec. 31, 2022	Dec. 31, 2021
Long Duration Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Weight	90%
Position	90%	89%
Equities Real Estate And Private Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Weight	10%
Position	10%	11%

Pension and Other Benefit Pro_9

Pension and Other Benefit Programs (Summary of Fair Value Of Assets Plan) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Net assets measured at fair value	$ 386.1	$ 500.3
Investments measured at net asset value	5.6	6.4
Net assets	391.7	506.7	$ 520.7
Collective trust funds - bonds
Defined Benefit Plan Disclosure [Line Items]
Net assets measured at fair value	350.3	451.9
Collective trust funds - equities
Defined Benefit Plan Disclosure [Line Items]
Net assets measured at fair value	32.6	46.8
Cash, Other Short-Term Investments and Payables, Net [Member]
Defined Benefit Plan Disclosure [Line Items]
Net assets measured at fair value	3.2	1.6
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Net assets measured at fair value	(0.3)	(0.3)
Level 1 [Member] \| Collective trust funds - bonds
Defined Benefit Plan Disclosure [Line Items]
Net assets measured at fair value	0	0
Level 1 [Member] \| Collective trust funds - equities
Defined Benefit Plan Disclosure [Line Items]
Net assets measured at fair value	0	0
Level 1 [Member] \| Cash, Other Short-Term Investments and Payables, Net [Member]
Defined Benefit Plan Disclosure [Line Items]
Net assets measured at fair value	(0.3)	(0.3)
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Net assets measured at fair value	386.4	500.6
Level 2 [Member] \| Collective trust funds - bonds
Defined Benefit Plan Disclosure [Line Items]
Net assets measured at fair value	350.3	451.9
Level 2 [Member] \| Collective trust funds - equities
Defined Benefit Plan Disclosure [Line Items]
Net assets measured at fair value	32.6	46.8
Level 2 [Member] \| Cash, Other Short-Term Investments and Payables, Net [Member]
Defined Benefit Plan Disclosure [Line Items]
Net assets measured at fair value	3.5	1.9
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Net assets measured at fair value	0	0
Level 3 [Member] \| Collective trust funds - bonds
Defined Benefit Plan Disclosure [Line Items]
Net assets measured at fair value	0	0
Level 3 [Member] \| Collective trust funds - equities
Defined Benefit Plan Disclosure [Line Items]
Net assets measured at fair value	0	0
Level 3 [Member] \| Cash, Other Short-Term Investments and Payables, Net [Member]
Defined Benefit Plan Disclosure [Line Items]
Net assets measured at fair value	$ 0	$ 0

Pension and Other Benefit Pr_10

Pension and Other Benefit Programs (Summary of Assets Measured at NAV) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Investments measured at net asset value	$ 5.6	$ 6.4
Real Estate [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Investments measured at net asset value	5.6	6.4
Unfunded commitments	$ 2.2	$ 2.2
Redemption frequency	Quarterly	Quarterly
Redemption notice period	60 days	60 days

Pension and Other Benefit Pr_11

Pension and Other Benefit Programs (Schedule of Periodic Benefit (Credit) Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Service cost of benefits earned during the period	$ 3.7	$ 4.8
Interest cost on accumulated postretirement benefit obligation	$ 10.5	$ 9
U.S. Defined-Benefit Retiree Health And Life Insurance Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax
Interest cost on accumulated postretirement benefit obligation	$ 1.5	$ 1.2	$ 1.9
Amortization of prior service (credit)	(0.3)	(0.3)	(0.3)
Amortization of net actuarial (gain) loss	(2.8)	(2.2)	(6.6)
Net periodic postretirement benefit (credit)	$ (1.6)	$ (1.3)	$ (5)

Pension and Other Benefit Pr_12

Pension and Other Benefit Programs (Schedule of Amounts Recognized in Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Prepaid pension costs	$ 83.2	$ 109
U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Prepaid pension costs	83.2	109
Accounts payable and accrued expenses	(2.7)	(2.9)
Pension benefit liabilities	(25.9)	(34.5)
Net amount recognized	54.6	71.6
Non-U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Accounts payable and accrued expenses	(0.1)	(0.1)
Pension benefit liabilities	(1.7)	(2.4)
Net amount recognized	(1.8)	(2.5)
U.S. Defined-Benefit Retiree Health And Life Insurance Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Accounts payable and accrued expenses	(7.1)	(6.9)
Postretirement benefit liabilities	(54.8)	(71.1)
Net amount recognized	$ (61.9)	$ (78)

Pension and Other Benefit Pr_13

Pension and Other Benefit Programs (Schedule of Amounts in Accumulated Other Comprehensive) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial (loss) gain	$ (171.9)	$ (152.1)
Accumulated other comprehensive (loss) income	(171.9)	(152.1)
U.S. Defined-Benefit Retiree Health And Life Insurance Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial (loss) gain	23.3	13.7
Prior service credit	1.2	1.4
Accumulated other comprehensive (loss) income	$ 24.5	$ 15.1

Pension and Other Benefit Pr_14

Pension and Other Benefit Programs (Schedule of Expected Benefit Payments) (Details) $ in Millions	Dec. 31, 2022 USD ($)
U.S. Defined-Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
2023	$ 17
2024	18.5
2025	20.4
2026	21.6
2027	22.9
2028 - 2032	121.2
U.S. Defined-Benefit Retiree Health And Life Insurance Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
2023	7
2024	6.7
2025	6.5
2026	6
2027	5.6
2028 - 2032	$ 23

Financial Instruments and Con_3

Financial Instruments and Contingent Consideration (Estimated Fair Value of Financial Instruments) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Acquisition-related contingent consideration	$ (15.2)	$ (8.6)
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total long-term debt, including current portion	(651.1)	(631.4)
Acquisition-related contingent consideration	(15.2)	(12.8)
Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total long-term debt, including current portion	(645.3)	(626)
Acquisition-related contingent consideration	(15.2)	(12.8)
Interest Rate Swap Contracts [Member] \| Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swap contracts	11.4	(14.2)
Interest Rate Swap Contracts [Member] \| Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swap contracts	$ 11.4	$ (14.2)

Financial Instruments and Con_4

Financial Instruments and Contingent Consideration (Summary of Fair Value, Assets and Liabilities Measured on Recurring Basis) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Acquisition-related contingent consideration	$ (15.2)	$ (8.6)
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Acquisition-related contingent consideration	0
Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Acquisition-related contingent consideration		(4.2)
Interest Rate Swap Contracts [Member] \| Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swap contracts	$ 11.4	$ (14.2)

Financial Instruments and Con_5

Financial Instruments and Contingent Consideration (Schedule of Weighted-Average of Significant Unobservable Inputs) (Details) - Turf [Member]	Dec. 31, 2021
Volatility [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Discount rates	22.20%
Discount Rates [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Discount rates	2.70%

Financial Instruments and Con_6

Financial Instruments and Contingent Consideration (Schedule of Changes in Fair Value of the Acquisition Related Contingent Consideration Liability) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Balance as of beginning of period	$ 12.8	$ 16.9	$ 0
Loss (Gain) related to change in fair value of contingent consideration	11	$ (4.1)	0.1
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability
Cash consideration paid	(8.6)
Fair Value, Recurring Basis, Unobservable Input Reconciliation, Liability, Gain (Loss), Statement of Income [Extensible List]		Loss (gain) from change in fair value of contingent consideration
Balance as of end of period	$ 15.2	$ 12.8	16.9
Moz Designs, Inc. [Member]
Business Acquisition [Line Items]
Acquisition date fair value of Moz contingent consideration			2.7
Turf [Member]
Business Acquisition [Line Items]
Acquisition date fair value of Moz contingent consideration			$ 14.1

Financial Instruments and Con_7

Financial Instruments and Contingent Consideration (Additional Information) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Aug. 24, 2020	Jul. 27, 2020
Business Acquisition [Line Items]
Business combination, consideration transferred estimated fair value	$ 15.2	$ 8.6
Cash consideration paid	$ 8.6
Fair Value, Inputs, Level 3 [Member]
Business Acquisition [Line Items]
Business combination, consideration transferred estimated fair value		$ 4.2
Moz Designs Inc [Member]
Business Acquisition [Line Items]
Business combination, consideration transferred estimated fair value			$ 2.7
Turf [Member]
Business Acquisition [Line Items]
Business combination, consideration transferred estimated fair value				$ 14.1

Derivative Financial Instrume_3

Derivative Financial Instruments (Summary of Interest Rate Swaps) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)
November 2018 to November 2023 [Member]
Derivative [Line Items]
Trade Date	Nov. 28, 2018
Notional Amount	$ 200
Coverage Period	November 2018 to November 2023
Risk Coverage	USD-LIBOR
September 2022 to December 2023 [Member]
Derivative [Line Items]
Trade Date	Sep. 19, 2022
Notional Amount	$ 25
Coverage Period	September 2022 to December 2023
Risk Coverage	USD-LIBOR
March 2021 to March 2025 [Member]
Derivative [Line Items]
Trade Date	Nov. 28, 2018
Notional Amount	$ 100
Coverage Period	March 2021 to March 2025
Risk Coverage	USD-LIBOR
March 2021 to March 2024 [Member]
Derivative [Line Items]
Trade Date	Mar. 10, 2020
Notional Amount	$ 50
Coverage Period	March 2021 to March 2024
Risk Coverage	USD-LIBOR
March 2021 to March 2024 [Member]
Derivative [Line Items]
Trade Date	Mar. 11, 2020
Notional Amount	$ 50
Coverage Period	March 2021 to March 2024
Risk Coverage	USD-LIBOR

Derivative Financial Instrume_4

Derivative Financial Instruments (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)
Derivative [Line Items]
Gain in AOCI expected to be recognized in earnings over the next twelve months	$ 10.4
Interest Rate Swap Contracts [Member]
Derivative [Line Items]
LIBOR floor	0%

Derivative Financial Instrume_5

Derivative Financial Instruments (Summary of Fair Value of Derivative Instruments on Consolidated Balance Sheet) (Details) - Interest Rate Swap Contracts [Member] - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Other Current Assets [Member]
Derivatives Fair Value [Line Items]
Derivative Assets, Fair Value	$ 3.7	$ 0
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets, Current	Other Assets, Current
Other Non-Current Assets [Member]
Derivatives Fair Value [Line Items]
Derivative Assets, Fair Value	$ 7.7	$ 0.4
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets, Noncurrent	Other Assets, Noncurrent
Accounts Payable and Accrued Expenses [Member]
Derivatives Fair Value [Line Items]
Derivative Liabilities, Fair Value	$ 0	$ 0.1
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Accounts Payable and Accrued Liabilities, Current	Accounts Payable and Accrued Liabilities, Current
Other Long-Term Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivative Liabilities, Fair Value	$ 0	$ 14.5
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Noncurrent	Other Liabilities, Noncurrent

Derivative Financial Instrume_6

Derivative Financial Instruments (Summary of Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in AOCI	$ 24.9	$ 13.4	$ (14.2)
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Comprehensive Income (Loss), Net of Tax	Other Comprehensive Income (Loss), Net of Tax	Other Comprehensive Income (Loss), Net of Tax
Derivatives in Cash Flow Hedging Relationships [Member] \| Interest Rate Swap Contracts [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in AOCI	$ 26.9	$ 21.9	$ (8.6)
Gain Reclassified from AOCI into Net Earnings (loss)	$ 2	$ 8.5	$ 5.6

Other Long-Term Liabilities (Sc

Other Long-Term Liabilities (Schedule of Other Long-Term Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Other Liabilities Disclosure [Abstract]
Long-term deferred compensation arrangements	$ 15.4	$ 17.6
Fair value of derivative liabilities	0	14.5
Environmental insurance recoveries received in excess of cumulative expenses incurred	3.5	4.8
Acquisition-related contingent consideration	0	4.2
Other	6.9	5.6
Total other long-term liabilities	$ 25.8	$ 46.7

Share-Based Compensation Plan_2

Share-Based Compensation Plans (Narrative) (Details) - USD ($) $ in Millions		12 Months Ended
	Jan. 05, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares outstanding		33,900	73,500
Adjusted share-based compensation cost		$ 14.3	$ 11.3	$ 6.9
Share-based compensation cost, net of tax		10.8	$ 8.5	$ 5.1
Total unrecognized compensation cost		$ 18.7
Total unrecognized compensation cost, weighted-average period		1 year 10 months 24 days
Employee Stock Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period		3 years
Award expiration period		10 years
Market Based Performance Stock Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares granted		57,439	54,231
Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period		5 years
RSUs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares granted		77,300
2016 LTIP [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Plan expiration date		Jul. 08, 2026
2022 ECIP [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares authorized		2,651,472
Shares available for grant		2,636,996
Plan expiration date		Jun. 15, 2032
2016 Director Stock Unit Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares authorized		250,000
Shares available for grant		145,437
Plan expiration date		Jul. 31, 2026
2016 Director Stock Unit Plan [Member] \| RSUs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period		1 year
Number of shares granted		13,467	8,314
Number of shares outstanding		80,890	130,393
Vested director stock units		67,423	122,079
2020 Inducement Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares authorized		19,000
Shares available for grant		6,921
Plan expiration date		Dec. 14, 2030
2020 Inducement Plan [Member] \| Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period		3 years
Awards forfeited		1,915
2006 Phantom Stock Unit Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for grant		0
Vested phantom shares				11,773
Total liability recorded for shares				$ 1.2
Liability-based award settlement payment date	Jan. 05, 2021
Number of shares outstanding		0	0
2006 Phantom Stock Unit Plan [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period		3 years
2006 Phantom Stock Unit Plan [Member] \| Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period		1 year

Share-Based Compensation Plan_3

Share-Based Compensation Plans (Schedule Of Changes In Stock Options) (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) $ / shares shares
Share-Based Payment Arrangement [Abstract]
Option shares outstanding, December 31, 2021, Number of shares \| shares	73,500
Option shares exercised, Number of shares \| shares	(39.6)
Option shares outstanding, December 31, 2022, Number of shares \| shares	33,900
Option shares exercisable, vested and expected to vest, December 31, 2022, Number of shares \| shares	33,900
Option shares outstanding, December 31, 2021, Weighted-average exercise price \| $ / shares	$ 46.05
Option shares exercised, Weighted-average exercise price \| $ / shares	(44.93)
Option shares outstanding, December 31, 2022, Weighted-average exercise price \| $ / shares	47.35
Option shares exercisable, vested and expected to vest, December 31, 2022. Weighted-average exercise price \| $ / shares	$ 47.35
Option shares outstanding, December 31, 2022, Weighted-average remaining contractual term	1 year 1 month 6 days
Option shares exercisable, vested and expected to vest, December 31, 2022. Weighted-average remaining contractual term	1 year 1 month 6 days
Option shares outstanding, December 31, 2022, Aggregate intrinsic value \| $	$ 0.7
Option shares exercisable, vested and expected to vest, December 31, 2022, Aggregate intrinsic value \| $	$ 0.7

Share-Based Compensation Plan_4

Share-Based Compensation Plans (Schedule Of Stock Option Exercises) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-Based Payment Arrangement [Abstract]
Total intrinsic value of stock options exercised	$ 1.3	$ 4.1	$ 5.6
Cash proceeds received from stock options exercised	1.8	2.5	4.7
Tax deduction realized from stock options exercised	$ 0.1	$ 0.4	$ 1.2

Share-Based Compensation Plan_5

Share-Based Compensation Plans (Schedule Of Restricted Stock, RSUs, Performance Restricted Stock and PSUs Activity) (Details)	12 Months Ended
	Dec. 31, 2022 $ / shares shares
RSUs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Beginning balance, Number of shares \| shares	65,000
Granted, Number of shares \| shares	77,300
Vested, Number of shares \| shares	(24,100)
Forfeited, Number of shares \| shares	(6,100)
Ending balance, Number of shares \| shares	112.1
Beginning balance, Weighted-average fair value at grant date \| $ / shares	$ 87.94
Granted, Weighted-average fair value at grant date \| $ / shares	86.98
Vested, Weighted-average fair value at grant date \| $ / shares	(90.32)
Forfeited, Weighted-average fair value at grant date \| $ / shares	(87.60)
Ending balance, Weighted-average fair value at grant date \| $ / shares	$ 86.66
PSUs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Beginning balance, Number of shares \| shares	301,800
Granted, Number of shares \| shares	118,200
Performance adjustments, Number of shares \| shares	(27,500)
Vested, Number of shares \| shares	(74,400)
Forfeited, Number of shares \| shares	(11,700)
Ending balance, Number of shares \| shares	306,400
Beginning balance, Weighted-average fair value at grant date \| $ / shares	$ 92.74
Granted, Weighted-average fair value at grant date \| $ / shares	96.67
Performance adjustments, Weighted-average fair value at grant date \| $ / shares	(71.84)
Vested, Weighted-average fair value at grant date \| $ / shares	(77.80)
Forfeited, Weighted-average fair value at grant date \| $ / shares	(102.92)
Ending balance, Weighted-average fair value at grant date \| $ / shares	$ 99.38
Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Beginning balance, Number of shares \| shares	72,600
Vested, Number of shares \| shares	(20,400)
Forfeited, Number of shares \| shares	(1,500)
Ending balance, Number of shares \| shares	50,700
Beginning balance, Weighted-average fair value at grant date \| $ / shares	$ 77.99
Vested, Weighted-average fair value at grant date \| $ / shares	(77.90)
Forfeited, Weighted-average fair value at grant date \| $ / shares	(77.22)
Ending balance, Weighted-average fair value at grant date \| $ / shares	$ 78.05

Share-Based Compensation Plan_6

Share-Based Compensation Plans (Schedule Of Weighted-Average Assumptions For PSUs Measured At Fair Value) (Details) - PSUs [Member] - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average grant date fair value of market based PSUs granted	$ 104.92	$ 117.85
Risk-free rate of return	1.80%	0.30%
Expected volatility	37%	37%
Expected term	3 years 1 month 6 days	3 years 1 month 6 days
Expected dividend yield	0%	0%

Employee Costs (Schedule Of Emp

Employee Costs (Schedule Of Employee Compensation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Compensation Related Costs [Abstract]
Wages, salaries and incentive compensation	$ 259.7	$ 259.9	$ 207.6
Payroll taxes	18.3	13.4	15.6
Defined contribution and defined benefit pension plan expense, net	8.5	10	1
Insurance and other benefit costs	29.9	28.2	25.1
Share-based compensation	14.3	11.3	6.9
Total	$ 330.7	$ 322.8	$ 256.2

Shareholders' Equity (Narrative

Shareholders' Equity (Narrative) (Details) - USD ($)

1 Months Ended

12 Months Ended

Feb. 14, 2023

Jul. 29, 2016

Oct. 31, 2022

Jul. 31, 2022

Apr. 30, 2022

Feb. 28, 2022

Dec. 31, 2022

Dec. 31, 2021

Dec. 31, 2020

Mar. 31, 2023

Nov. 30, 2022

Aug. 31, 2022

May 31, 2022

Mar. 31, 2022

Equity Class Of Treasury Stock [Line Items]

Shares repurchase program, repurchased cost

$ 165,000,000

$ 80,000,000

$ 44,400,000

Quarterly dividends declared

$ 0.231

Dividends declared

$ 0.254

$ 0.947

$ 0.861

$ 0.810

Dividends payable, date to be paid, year and month

2022-11

2022-08

2022-05

2022-03

Scenario Forecast [Member]

Equity Class Of Treasury Stock [Line Items]

Dividends declared

$ 0.254

Dividends payable, date to be paid, year and month

2023-03

Common Stock

Equity Class Of Treasury Stock [Line Items]

Shares repurchase program, expiration date

Dec. 31, 2023

Stock repurchase program, remaining authorized repurchase amount

$ 348,800,000

Shares repurchase program, shares repurchased

1,889,742

784,901

508,693

Common Stock | Share Repurchase Program Excluding Accelerated Share Repurchase

Equity Class Of Treasury Stock [Line Items]

Shares repurchase program, shares repurchased

1,900,000

Shares repurchase program, repurchased cost

$ 165,000,000

Shares repurchase program, average price per share

$ 87.31

Common Stock | Share Repurchase Program Including Accelerated Share Repurchase

Equity Class Of Treasury Stock [Line Items]

Shares repurchase program, shares repurchased

12,400,000

Shares repurchase program, repurchased cost

$ 851,200,000

Shares repurchase program, average price per share

$ 68.66

Common Stock | Maximum [Member]

Equity Class Of Treasury Stock [Line Items]

Shares repurchase program, authorized amount

$ 1,200,000,000

Shareholders' Equity (Component

Shareholders' Equity (Components Of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Stockholders' Equity Note [Abstract]
Foreign currency translation adjustments	$ 0.5	$ 2.3
Derivative gain (loss), net	9.5	(9.1)
Pension and postretirement adjustments	(110.1)	(102.8)
Accumulated other comprehensive (loss)	$ (100.1)	$ (109.6)

Shareholders' Equity (Schedule

Shareholders' Equity (Schedule Of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Stockholders' Equity Note [Abstract]
Foreign currency translation adjustments, Pre-tax Amount	$ (1.8)		$ (7.1)
Derivative gain (loss), net, pre-tax amount	24.9	$ 13.4	(14.2)
Pension and postretirement adjustments, Pre-tax Amount	(9.6)	(13.4)	382.9
Total other comprehensive income (loss), Pre-tax Amount	13.5	0	361.6
Derivative gain (loss), net, Tax (Expense) Benefit	(6.3)	(3.5)	3.7
Pension and postretirement adjustments, Tax (Expense) Benefit	2.3	3.2	(98.5)
Total other comprehensive income (loss), Tax (Expense) Benefit	(4)	(0.3)	(94.8)
Foreign currency translation adjustments, After-tax Amount	(1.8)	0	(7.1)
Derivative gain (loss), net, After-tax Amount	18.6	9.9	(10.5)
Pension and postretirement adjustments, after-tax amount	(7.3)	(10.2)	284.4
Total other comprehensive income (loss)	$ 9.5	$ (0.3)	$ 266.8

Shareholders' Equity (Schedul_2

Shareholders' Equity (Schedule Of Accumulated Other Comprehensive Income Activity) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ 519.7	$ 450.9
Ending Balance	535	519.7
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	2.3	2.3
Other comprehensive income (loss) before reclassifications, net of tax (expense) benefit	(1.8)	0
Amounts reclassified from accumulated other comprehensive (loss)	0	0
Net current period other comprehensive (loss) income	(1.8)	0
Ending Balance	0.5	2.3
Derivative Gain (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(9.1)	(19)
Other comprehensive income (loss) before reclassifications, net of tax (expense) benefit	20.2	16.5
Amounts reclassified from accumulated other comprehensive (loss)	(1.6)	(6.6)
Net current period other comprehensive (loss) income	18.6	9.9
Ending Balance	9.5	(9.1)
Pension And Postretirement Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(102.8)	(92.6)
Other comprehensive income (loss) before reclassifications, net of tax (expense) benefit	(8.1)	(11)
Amounts reclassified from accumulated other comprehensive (loss)	0.8	0.8
Net current period other comprehensive (loss) income	(7.3)	(10.2)
Ending Balance	(110.1)	(102.8)
Accumulated Other Comprehensive (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(109.6)	(109.3)
Other comprehensive income (loss) before reclassifications, net of tax (expense) benefit	10.3	5.5
Amounts reclassified from accumulated other comprehensive (loss)	(0.8)	(5.8)
Net current period other comprehensive (loss) income	9.5	(0.3)
Ending Balance	$ (100.1)	$ (109.6)

Shareholders' Equity (Schedul_3

Shareholders' Equity (Schedule of Accumulated Other Comprehensive (Loss) Activity) (Parenthetical) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Accumulated Other Comprehensive Income Loss [Line Items]
Other comprehensive income (loss) before reclassifications, tax benefit (expense)	$ (4.1)	$ (1.9)
Derivative Gain (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Other comprehensive income (loss) before reclassifications, tax benefit (expense)	(6.7)	(5.4)
Pension And Postretirement Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Other comprehensive income (loss) before reclassifications, tax benefit (expense)	$ 2.6	$ 3.5

Shareholders' Equity (Reclassif

Shareholders' Equity (Reclassification out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ (27.1)	$ (22.9)	$ (24.1)
Tax impact	(57.7)	(57.4)	42.6
Total (income), net of tax	(202.9)	(183.2)	99.1
Other non-operating (income) expense, net	(0.2)	(0.2)	$ (1)
Reclassification From Accumulated Other Comprehensive Loss [Member] \| Derivative Gain (Loss) [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Tax impact	0.4	1.9
Total (income), net of tax	1.6	6.6
Reclassification From Accumulated Other Comprehensive Loss [Member] \| Derivative Gain (Loss) [Member] \| Interest Rate Swap Contracts, Before Tax [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Interest expense	(2)	(8.5)
Reclassification From Accumulated Other Comprehensive Loss [Member] \| Prior Service Credit Amortization [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Other non-operating (income) expense, net	(0.3)	(0.3)
Reclassification From Accumulated Other Comprehensive Loss [Member] \| Amortization of Net Actuarial Loss [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Other non-operating (income) expense, net	1.4	1.4
Reclassification From Accumulated Other Comprehensive Loss [Member] \| Pension And Postretirement Adjustments [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Total loss, before tax	1.1	1.1
Tax impact	(0.3)	(0.3)
Total loss, net of tax	0.8	0.8
Total reclassifications for the period	$ (0.8)	$ (5.8)

Supplemental Financial Inform_3

Supplemental Financial Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Supplemental Financial Information [Line Items]
Cost of goods sold	$ 784	$ 701	$ 603.8
Product innovation costs	14.9	14.6	14.7
Advertising costs	9.2	8	6.8
Interest income	(0.5)	(0.1)	(0.3)
Pension and postretirement (credits) cost	(5.3)	(5.3)	358.7
Other	(0.2)	(0.2)	(1)
Other non-operating (income) expense, net	(6)	(5.6)	357.4
Maintenance and Repair Costs [Member]
Supplemental Financial Information [Line Items]
Cost of goods sold	$ 42.7	$ 41.9	$ 38.1

Related Parties (Narrative) (De

Related Parties (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Related Party Transaction [Line Items]
Accounts payable and accrued expenses related to adjustments to consideration of debt in connection with sale of business	$ 172.5	$ 174.9
WAVE [Member]
Related Party Transaction [Line Items]
Percentage of ownership in joint venture	50%	50%
Purchases from joint venture	$ 34.5	$ 27.9	$ 21.5
Reimbursement from joint venture	29.1	21.6	$ 20.7
Due to related parties	$ 5.3	$ 4.3

Litigation and Related Matters

Litigation and Related Matters (Narrative) (Details) $ in Millions	1 Months Ended	12 Months Ended			60 Months Ended
	Sep. 30, 2010 Site	Dec. 31, 2022 USD ($) Site	Dec. 31, 2021 USD ($)	Dec. 31, 2007	Dec. 31, 2021 USD ($)
Loss Contingencies [Line Items]
Settlement agreement amount of litigation agreement					$ 53
Environmental insurance recoveries received in excess of cumulative expenses incurred		$ 3.5	$ 4.8		4.8
Environmental liabilities		0.5	0.7		0.7
Reserves for potential environmental liabilities		1.3	0.2
Other Long-Term Liabilities [Member]
Loss Contingencies [Line Items]
Environmental liabilities		$ 0.5	$ 0.5		$ 0.5
Accounts Payable and Accrued Expenses [Member]
Loss Contingencies [Line Items]
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]			Accounts payable and accrued expenses		Accounts payable and accrued expenses
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]			Accounts Payable and Accrued Liabilities, Current		Accounts Payable and Accrued Liabilities, Current
Environmental liabilities			$ 0.2		$ 0.2
Macon Site [Member]
Loss Contingencies [Line Items]
Number of landfills listed as Superfund site \| Site		2
Number of landfills AWI entered into an Administrative Order on Consent for a Removal Action \| Site	1
Submission date of final report to EPA	Oct. 31, 2016
Elizabeth City [Member]
Loss Contingencies [Line Items]
Percentage of site costs Navy agreed to pay				33.33%

Earnings Per Share (Reconciliat

Earnings Per Share (Reconciliation of Earnings (Loss) to Earnings (Loss) Attributable to Common Shares Used in Basic and Diluted Earnings (Loss) Per Share Calculation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Earnings (loss) from continuing operations	$ 199.9	$ 185.3	$ (84.1)
(Earnings) allocated to participating vested share awards	(0.3)	(0.3)	(0.1)
Earnings (loss) from continuing operations attributable to common shares	$ 199.6	$ 185	$ (84.2)

Earnings Per Share (Reconcili_2

Earnings Per Share (Reconciliation of Basic Shares Outstanding to Diluted Shares Outstanding) (Details) - shares shares in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Basic shares outstanding	46.3	47.6	47.9
Dilutive effect of common stock equivalents	0.1	0.3	0
Diluted shares outstanding	46.4	47.9	47.9

Earnings Per Share (Narrative)

Earnings Per Share (Narrative) (Details) - shares	12 Months Ended
Earnings Per Share (Narrative) (Details) - shares	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Common stock equivalents not included in the computation of diluted EPS	19,134	8,548	313,003

Schedule II (Details)

Schedule II (Details) - USD ($) $ in Millions	12 Months Ended
Schedule II (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Provision For Bad Debts [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	$ 1	$ 1.4	$ 0.7
Additions charged to earnings	0.1	0.4	0.9
Deductions	(0.7)	(0.8)	(0.2)
Balance at end of year	0.4	1	1.4
Provision For Discounts [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	1.7	1.3	1.4
Additions charged to earnings	24.4	21.7	19.4
Deductions	(24)	(21.3)	(19.5)
Balance at end of year	2.1	1.7	1.3
Provision For Warranties [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	0.8	0.9	0.2
Additions charged to earnings	5.6	3.9	5.5
Deductions	(5.7)	(4)	(4.8)
Balance at end of year	0.7	0.8	0.9
Provision For Inventory Obsolescence [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	0.2	0	0.5
Additions charged to earnings	0.2	0.3	0.1
Deductions	(0.1)	(0.1)	(0.6)
Balance at end of year	$ 0.3	$ 0.2	$ 0