A. O. Smith (AOS) 10-Q27 Oct 232023 Q3 Quarterly reportFinancial data

Company Profile

Cover Page

Cover Page - shares	9 Months Ended
Cover Page - shares	Sep. 30, 2023	Oct. 25, 2023
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2023
Document Transition Report	false
Entity File Number	1-475
Entity Registrant Name	A. O. Smith Corporation
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	39-0619790
Entity Address, Address Line One	11270 West Park Place
Entity Address, City or Town	Milwaukee
Entity Address, State or Province	WI
Entity Address, Postal Zip Code	53224-9508
City Area Code	414
Local Phone Number	359-4000
Title of 12(b) Security	Common Stock (par value $1.00 per share)
Trading Symbol	AOS
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Amendment Flag	false
Entity Central Index Key	0000091142
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		25,892,752
Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		122,827,676

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Net sales		$ 937.5	$ 874.2	$ 2,864.7	$ 2,817.8
Cost of products sold		581.3	569.2	1,749.7	1,836.8
Gross profit		356.2	305	1,115	981
Selling, general and administrative expenses		174.9	155.5	542.4	502
Impairment expense		0	0	15.6	0
Interest expense		2.4	2.4	10.9	6
Other expense (income), net		2.5	2.4	(10.5)	6.4
Earnings before provision for income taxes		176.4	144.7	556.6	466.6
Provision for income taxes		41	34.9	137.3	110.8
Net Earnings		$ 135.4	$ 109.8	$ 419.3	$ 355.8
Basic Net Earnings Per Share of Common Stock (in USD per share)	[1]	$ 0.90	$ 0.71	$ 2.79	$ 2.29
Diluted Net Earnings Per Share of Common Stock (in USD per share)	[1]	0.90	0.71	2.77	2.27
Dividends Per Share of Common Stock (in USD per share)		$ 0.30	$ 0.28	$ 0.90	$ 0.84

[1]Earnings per share amounts are calculated discretely and, therefore, may not add up to the total due to rounding.

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net earnings	$ 135.4	$ 109.8	$ 419.3	$ 355.8
Other comprehensive earnings (loss)
Foreign currency translation adjustments	(6.9)	(28.9)	(5.4)	(52.9)
Unrealized (losses) gains on cash flow derivative instruments, less related income tax benefit (provision) of $0.3 and $0.8 in 2023, $(1.1) and $(1.6) in 2022	(0.8)	3.5	(2.4)	5
Adjustment to pension liability, less related income tax provision of $0.0 and $(0.1) in 2023, $(1.3) and $(3.8) in 2022	0	3.7	0.1	11.2
Comprehensive Earnings	$ 127.7	$ 88.1	$ 411.6	$ 319.1

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Income tax benefit on cash flow derivative instruments	$ 0.3	$ (1.1)	$ 0.8	$ (1.6)
Income tax provision on adjustment to pension liability	$ 0	$ (1.3)	$ (0.1)	$ (3.8)

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Current Assets
Cash and cash equivalents	$ 281	$ 391.2
Marketable securities	60.8	90.6
Receivables	587.4	581.2
Inventories	519	516.4
Other current assets	56.3	54.3
Total Current Assets	1,504.5	1,633.7
Property, plant and equipment	1,382.1	1,364.8
Less accumulated depreciation	(801)	(774.1)
Net property, plant and equipment	581.1	590.7
Goodwill	630.5	619.7
Other intangibles	338.6	347.9
Operating lease assets	33.3	29.8
Other assets	112.1	110.5
Total Assets	3,200.1	3,332.3
Current Liabilities
Trade payables	561.8	625.8
Accrued payroll and benefits	86.7	75.7
Accrued liabilities	175.2	159.1
Product warranties	61.9	63.6
Debt due within one year	10	10
Total Current Liabilities	895.6	934.2
Long-term debt	119.6	334.5
Product warranties	119.8	118.9
Long-term operating lease liabilities	26	22.4
Other liabilities	156.7	174.6
Total Liabilities	1,317.7	1,584.6
Stockholders’ Equity
Capital in excess of par value	570.8	555.9
Retained earnings	3,168.5	2,885
Accumulated other comprehensive loss	(90.1)	(82.4)
Treasury stock at cost	(2,061.7)	(1,905.7)
Total Stockholders’ Equity	1,882.4	1,747.7
Total Liabilities and Stockholders’ Equity	3,200.1	3,332.3
Class A Common Stock
Stockholders’ Equity
Common Stock, value	130.2	130.2
Common Stock
Stockholders’ Equity
Common Stock, value	$ 164.7	$ 164.7

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - shares	Sep. 30, 2023	Dec. 31, 2022
Class A Common Stock
Common Stock, shares issued (in shares)	26,028,448	26,035,656
Common Stock
Common Stock, shares issued (in shares)	164,679,146	164,671,938

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Operating Activities
Net earnings	$ 419.3	$ 355.8
Adjustments to reconcile net earnings to cash provided by (used in) operating activities:
Depreciation and amortization	57.5	56.5
Stock based compensation expense	10.1	10.4
Non-cash impairment	15.6	0
Pension settlement income	(6)	0
Pension settlement income non-cash taxes	1.5	0
Net changes in operating assets and liabilities:
Current assets and liabilities	(44.6)	(212.6)
Noncurrent assets and liabilities	(14.4)	4.6
Cash Provided by Operating Activities	439	214.7
Investing Activities
Capital expenditures	(42.7)	(50.9)
Acquisitions of businesses	(16.1)	(8)
Investments in marketable securities	(63.1)	(35.3)
Net proceeds from sale of marketable securities	91.1	152.5
Cash (Used in) Provided by Investing Activities	(30.8)	58.3
Financing Activities
Long-term debt repaid	(214.9)
Long-term debt incurred		94.6
Common stock repurchases	(161.4)	(282)
Net proceeds (payments) from stock option activity	11.3	(1.6)
Dividends paid	(135.7)	(131.1)
Cash Used in Financing Activities	(500.7)	(320.1)
Effect of exchange rate changes on cash and cash equivalents	(17.7)	(37.4)
Net decrease in cash and cash equivalents	(110.2)	(84.5)
Cash and cash equivalents - beginning of period	391.2	443.3
Cash and Cash Equivalents - End of Period	$ 281	$ 358.8

CONDENSED CONSOLIDATED STATEM_5

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Millions	Total	Common Stock Class A Common Stock	Common Stock Common Stock	Capital in Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock
Balance at the beginning of period at Dec. 31, 2021		$ 130.5	$ 164.7	$ 545.2	$ 2,826.6		$ (1,503.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of Class A Common Stock		(0.2)	0	0.2
Issuance of share units				(6)
Vesting of share units				(2.4)			2.4
Stock based compensation expense				10.1
Exercise of stock options				0.8			(2.4)
Issuance of share based compensation				7
Net earnings	$ 355.8				355.8
Dividends on stock					(131.3)
Stock incentives and directors’ compensation							0.3
Shares repurchased							(282)
Excise tax on repurchases of common stock							0
Balance at end of period at Sep. 30, 2022	1,747.8	130.3	164.7	554.9	3,051.1	$ (368.1)	(1,785.1)
Balance at the beginning of period at Jun. 30, 2022		130.5	164.7	553.1	2,984.6		(1,694)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of Class A Common Stock		(0.2)	0	0.2
Issuance of share units				0
Vesting of share units				0			0
Stock based compensation expense				1.2
Exercise of stock options				0.4			0.5
Issuance of share based compensation				0
Net earnings	109.8				109.8
Dividends on stock					(43.3)
Stock incentives and directors’ compensation							0
Shares repurchased							(91.6)
Excise tax on repurchases of common stock							0
Balance at end of period at Sep. 30, 2022	1,747.8	130.3	164.7	554.9	3,051.1	(368.1)	(1,785.1)
Balance at the beginning of period at Dec. 31, 2022	1,747.7	130.2	164.7	555.9	2,885		(1,905.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of Class A Common Stock		0	0	0
Issuance of share units				(10.3)
Vesting of share units				(3.2)			3.2
Stock based compensation expense				9.3
Exercise of stock options				7.8			3.5
Issuance of share based compensation				11.3
Net earnings	419.3				419.3
Dividends on stock					(135.8)
Stock incentives and directors’ compensation							0.3
Shares repurchased							(161.4)
Excise tax on repurchases of common stock							(1.6)
Balance at end of period at Sep. 30, 2023	1,882.4	130.2	164.7	570.8	3,168.5	(90.1)	(2,061.7)
Balance at the beginning of period at Jun. 30, 2023		130.2	164.7	568.3	3,078.4		(1,970.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of Class A Common Stock		0	0	0
Issuance of share units				0
Vesting of share units				(0.1)			0.1
Stock based compensation expense				1.2
Exercise of stock options				1.3			1.7
Issuance of share based compensation				0.1
Net earnings	135.4				135.4
Dividends on stock					(45.3)
Stock incentives and directors’ compensation							0
Shares repurchased							(91.8)
Excise tax on repurchases of common stock							(0.9)
Balance at end of period at Sep. 30, 2023	$ 1,882.4	$ 130.2	$ 164.7	$ 570.8	$ 3,168.5	$ (90.1)	$ (2,061.7)

Basis of Presentation

Basis of Presentation	9 Months Ended
Basis of Presentation	Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (GAAP) for interim financial information and pursuant to the rules and regulations of the Securities and Exchange Commission (SEC). Accordingly, they do not include all of the information and footnotes required for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Operating results for the three and nine months ended September 30, 2023 are not necessarily indicative of the results expected for the full year. It is suggested the accompanying condensed consolidated financial statements be read in conjunction with the audited consolidated financial statements and the notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2022 filed with the SEC on February 14, 2023. Recent Accounting Pronouncements No recent accounting pronouncements are expected to have an impact on our condensed consolidated financial statements.

Revenue Recognition

Revenue Recognition	9 Months Ended
Revenue Recognition	Sep. 30, 2023
Revenue from Contract with Customer [Abstract]
Revenue Recognition	Revenue Recognition Substantially all of the Company’s sales are from contracts with customers for the purchase of its products. Contracts and customer purchase orders are used to determine the existence of a sales contract. Shipping documents are used to verify shipment. For substantially all of its products, the Company transfers control of products to the customer at the point in time when title and risk are passed to the customer, which generally occurs upon shipment of the product. Each unit sold is considered an independent, unbundled performance obligation. The Company’s sales arrangements do not include other performance obligations that are material in the context of the contract. The nature, timing and amount of revenue for a respective performance obligation are consistent for each customer. The Company measures the sales transaction price based upon the payment terms associated with the transaction and whether the sales price is subject to refund or adjustment. Sales and value added taxes are excluded from the measurement of the transaction price. The Company’s payment terms for the majority of its customers are 30 to 90 days from shipment. Additionally, certain customers in China pay the Company prior to the shipment of products resulting in a customer deposits liability of $155.9 million and $85.7 million at September 30, 2023 and December 31, 2022, respectively. Customer deposit liabilities are short term in nature, recognized into revenue within one year of receipt. The Company assesses the collectability of customer receivables based on the creditworthiness of a customer as determined by credit checks and analysis, as well as the customer’s payment history. In determining the allowance for credit losses, the Company also considers various factors including the aging of customer accounts and historical write-offs. In addition, the Company monitors other risk factors including forward-looking information when establishing adequate allowances for credit losses, which reflects the current estimate of credit losses expected to be incurred over the life of the receivables. The Company’s allowance for credit losses was $9.3 million and $9.5 million at September 30, 2023 and December 31, 2022, respectively. Rebates and incentives are based on pricing agreements and are tied to sales volume. The amount of revenue is reduced for variable consideration related to customer rebates which are calculated using expected values and are based on program specific factors such as expected rebate percentages based on expected volumes. In situations where the customer has the right to return eligible products, the Company reduces revenue for its estimates of expected product returns, which are primarily based on an analysis of historical experience. Changes in such accruals may be required if actual sales volume differs from estimated sales volume or if future returns differ from historical experience. Shipping and handling costs billed to customers are included in net sales and the related costs are included in cost of products sold and are activities performed to fulfill the promise to transfer products. Disaggregation of Net Sales The Company is comprised of two reporting segments: North America and Rest of World. The Rest of World segment is primarily comprised of China, Europe and India. Both segments manufacture and market comprehensive lines of residential and commercial gas, heat pump and electric water heaters, boilers, tanks and water treatment products. Both segments primarily manufacture and market in their respective regions of the world. As each segment manufactures and markets products in its respective region of the world, the Company has determined that geography is the primary factor in reporting its sales. The Company further disaggregates its North America segment sales by major product line as each of North America’s major product lines is sold through distinct distribution channels and these product lines may be impacted differently by certain economic factors. Within the Rest of World segment, particularly in China and India, the Company’s major customers purchase across the Company’s product lines, utilizing the same distribution channels regardless of product type. In addition, the impact of economic factors is unlikely to be differentiated by product line in the Rest of World segment. The North America segment's major product lines are defined as the following: Water heaters The Company’s water heaters are open water heating systems that heat potable water. Typical applications for water heaters include residences, restaurants, hotels, office buildings, laundries, car washes and small businesses. The Company sells residential and commercial water heater products and related parts through its wholesale distribution channel, which includes more than 1,000 independent wholesale plumbing distributors. The Company also sells residential water heaters and related parts through retail and maintenance, repair and operations (MRO) channels. A significant portion of the Company’s water heater sales in the North America segment is derived from the replacement of existing products. Boilers The Company’s boilers are closed loop water heating systems used primarily for space heating or hydronic heating. The Company’s boilers are primarily used in applications in commercial settings for hospitals, schools, hotels and other large commercial buildings while residential boilers are used in homes, apartments and condominiums. The Company’s boiler distribution channel is comprised primarily of manufacturer representative firms, with the remainder of its boilers distributed through wholesale channels. The Company’s boiler sales in the North America segment are derived from a combination of replacement of existing products and new construction. Water treatment products The Company’s water treatment products range from point-of-entry water softeners, solutions for problem well water, and whole-home water filtration products to on-the-go filtration bottles, point-of-use carbon, and reverse osmosis products. Typical applications for the Company’s water treatment products include residences, restaurants, hotels and offices. The Company sells water treatment products through its retail and wholesale distribution channels, similar to water heaters. The Company’s water treatment products are also sold through independent water quality dealers as well as directly to consumers including through e-commerce sales channels. A portion of the Company’s sales of water treatment products in the North America segment is comprised of replacement filters. The following table disaggregates the Company’s net sales by segment. As described above, the Company’s North America segment sales are further disaggregated by major product line. In addition, the Company’s Rest of World segment sales are disaggregated by China and all other Rest of World: (dollars in millions) Three Months Ended Nine Months Ended 2023 2022 2023 2022 North America Water heaters and related parts $ 593.7 $ 525.6 $ 1,833.6 $ 1,755.3 Boilers and related parts 61.8 75.5 181.5 203.4 Water treatment products 54.4 51.8 169.8 168.4 Total North America 709.9 652.9 2,184.9 2,127.1 Rest of World China $ 201.3 $ 194.3 $ 609.2 $ 624.1 All other Rest of World 32.1 35.9 87.5 92.0 Total Rest of World 233.4 230.2 696.7 716.1 Inter-segment sales (5.8) (8.9) (16.9) (25.4) Total Net Sales $ 937.5 $ 874.2 $ 2,864.7 $ 2,817.8

Acquisition and Disposition

Acquisition and Disposition	9 Months Ended
Acquisition and Disposition	Sep. 30, 2023
Discontinued Operations and Disposal Groups [Abstract]
Acquisition and Disposition	Acquisition and Disposition Acquisition During the third quarter of 2023, the Company acquired a privately-held water treatment company. The Company paid an aggregate cash purchase price of $16.1 million, net of cash acquired. The addition of the acquired company expands the Company's water treatment platform. The acquired company is included in the North America segment. As required under ASC 805 Business Combinations, results of operations have been included in the Company’s consolidated financial statements from the date of their acquisition. Disposition On April 26, 2023, the Company sold its business in Turkey (disposal group), which was included in the Company's Rest of World segment, for an amount that approximated the carrying value of the net assets. During the first quarter of 2023, the Company determined that the disposal group met the criteria to be classified as held for sale and that the fair value of the disposal group, less cost to sell, was lower than its carrying amount. As a result, in the first quarter of 2023, the Company recorded an impairment expense of $15.6 million, of which $12.5 million was recorded in the Rest of World segment, and $3.1 million was recorded in Corporate Expense. The impairment was recorded as a net reduction of $4.5 million to the assets and liabilities and $11.1 million for the anticipated liquidation of the cumulative foreign currency translation adjustment associated with the disposal group. The remaining carrying value of the disposal group as of March 31, 2023, was $0.6 million and classified as held for sale. Upon closing of the sale in the second quarter of 2023, the Company released $11.0 million of foreign currency translation losses from accumulated other comprehensive loss.

Leases

Leases	9 Months Ended
Leases	Sep. 30, 2023
Leases [Abstract]
Leases	Leases The Company’s lease portfolio consists of operating leases for buildings and equipment, such as forklifts and copiers, primarily in the United States and China. The Company defines a lease as a contract that gives the Company the right to control the use of a physical asset for a stated term. The Company pays the lessor for that right, with a series of payments defined in the contract and a corresponding right of use operating lease asset and liability are recorded. The Company has elected not to record leases with an initial term of 12 months or less on its condensed consolidated balance sheet. To determine balance sheet amounts, required legal payments are discounted using the Company’s incremental borrowing rate as of the inception of the lease. The incremental borrowing rate is the rate of interest that the Company would incur if it were to borrow, on a collateralized basis, an amount equal to the value of the leased item over a similar term, in a similar economic environment. Variable lease components not based on an index or rate are excluded from the measurement of the lease asset and liability and expensed as incurred for all asset classes. Certain leases include one or more options to renew or terminate. Renewal terms can extend the lease term from one Supplemental balance sheet information related to leases is as follows: (dollars in millions) September 30, December 31, 2022 Liabilities Short term: Accrued liabilities $ 9.4 $ 9.9 Long term: Operating lease liabilities 26.0 22.4 Total operating lease liabilities $ 35.4 $ 32.3 Less: Rent incentives and deferrals (2.1) (2.5) Assets Operating lease assets $ 33.3 $ 29.8 Lease Term and Discount Rate September 30, 2023 Weighted-average remaining lease term 7.1 years Weighted-average discount rate 4.10 % The components of lease expense were as follows: (dollars in millions) Three months ended Lease Expense Classification 2023 (1) 2022 (2) Operating lease expense Cost of products sold $ 1.5 $ 0.7 Selling, general and administrative expenses 3.9 4.1 (1) 2023 includes short-term and variable lease expenses of $1.2 million and $1.0 million, respectively. (2) 2022 includes short-term and variable lease expenses of $0.5 million and $0.8 million, respectively. (dollars in millions) Nine Months Ended Lease Expense Classification 2023 (1) 2022 (2) Operating lease expense Cost of products sold $ 4.1 $ 2.7 Selling, general and administrative expenses 12.3 12.4 (1) 2023 includes short-term and variable lease expenses of $3.4 million and $3.4 million, respectively. (2) 2022 includes short-term and variable lease expenses of $1.6 million and $2.5 million, respectively. Maturities of lease liabilities were as follows: (dollars in millions) September 30, 2023 $ 2.9 2024 9.8 2025 7.2 2026 5.2 2027 3.5 After 2027 13.2 Total lease payments 41.8 Less: Imputed interest (6.4) Present value of operating lease liabilities $ 35.4

Inventories

Inventories	9 Months Ended
Inventories	Sep. 30, 2023
Inventory Disclosure [Abstract]
Inventories	Inventories The following table presents the components of the Company’s inventory balances: (dollars in millions) September 30, December 31, 2022 Finished products $ 187.0 $ 174.4 Work in process 47.0 42.1 Raw materials 334.0 349.2 Inventories, at FIFO cost 568.0 565.7 LIFO reserve (49.0) (49.3) Inventories, at LIFO cost $ 519.0 $ 516.4

Product Warranties

Product Warranties	9 Months Ended
Product Warranties	Sep. 30, 2023
Guarantees and Product Warranties [Abstract]
Product Warranties	Product Warranties The Company offers warranties on the sales of certain of its products with terms that are consistent with the market and records an accrual for the estimated future claims. The following table presents the Company’s warranty liability activity: (dollars in millions) Three Months Ended 2023 2022 Balance at July 1, $ 180.7 $ 180.0 Expense 18.6 14.0 Claims settled (17.6) (16.8) Balance at September 30, $ 181.7 $ 177.2 (dollars in millions) Nine Months Ended 2023 2022 Balance at January 1, $ 182.5 $ 184.4 Expense 55.3 42.6 Claims settled (56.1) (49.8) Balance at September 30, $ 181.7 $ 177.2

Debt

Debt	9 Months Ended
Debt	Sep. 30, 2023
Debt Disclosure [Abstract]
Debt	DebtIn 2021, the Company renewed and amended its $500 million multi-year multi-currency revolving credit agreement with a new expiration date of April 1, 2026. The facility has an accordion provision that allows it to be increased up to $850 million if certain conditions (including lender approval) are satisfied. Borrowings under the Company's bank credit lines and commercial paper borrowings are supported by a $500 million revolving credit agreement. As a result of the long-term nature of this facility, the Company’s commercial paper and credit line borrowings are classified as long-term debt at September 30, 2023. At its option, the Company either maintains cash balances or pays fees for bank credit and services. The facility requires the Company to maintain two financial covenants, a leverage ratio test and an interest coverage test. The Company was in compliance with the covenants as of September 30, 2023.

Earnings per Share of Common St

Earnings per Share of Common Stock	9 Months Ended
Earnings per Share of Common Stock	Sep. 30, 2023
Earnings Per Share [Abstract]
Earnings per Share of Common Stock	Earnings per Share of Common Stock The numerator for the calculation of basic and diluted earnings per share is net earnings. The following table sets forth the computation of basic and diluted weighted-average shares used in the earnings per share calculations: Three Months Ended Nine Months Ended 2023 2022 2023 2022 Denominator for basic earnings per share - weighted average shares 150,103,113 154,197,072 150,488,897 155,625,624 Effect of dilutive stock options and share units 1,106,861 877,790 1,058,910 1,037,520 Denominator for diluted earnings per share 151,209,974 155,074,862 151,547,807 156,663,144

Stock Based Compensation

Stock Based Compensation	9 Months Ended
Stock Based Compensation	Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]
Stock Based Compensation	Stock Based Compensation The Company adopted the A. O. Smith Combined Incentive Compensation Plan (the Incentive Plan) effective January 1, 2007, and the Incentive Plan was recently reapproved by stockholders on April 15, 2020. The Incentive Plan is a continuation of the A. O. Smith Combined Executive Incentive Compensation Plan which was originally approved by stockholders in 2002. The number of shares available for granting of share units at September 30, 2023 was 2,475,242. Upon stock option exercise or share unit vesting, shares are issued from treasury stock. Total stock based compensation expense recognized in the three months ended September 30, 2023 and 2022 was $1.5 million and $1.4 million, respectively. Total stock based compensation expense recognized in the nine months ended September 30, 2023 and 2022 was $10.1 million and $10.4 million, respectively. Stock Options Beginning in 2023, the Company no longer grants stock options. Stock options previously granted have a three year pro rata vesting from the date of grant. Stock options were issued at exercise prices equal to the fair value of the Company’s Common Stock on the date of grant. For active employees, all options granted expire ten years after the date of grant. The Company’s stock options are expensed ratably over the three year vesting period; however, included in the stock option expense for the nine months ended September 30, 2022 was expense associated with the accelerated vesting of stock option awards for certain employees who either are retirement eligible or become retirement eligible during the vesting period. Stock based compensation expense attributable to stock options in the three months ended September 30, 2023 and 2022 was $0.3 million and $0.5 million, respectively. Stock based compensation expense attributable to stock options in the nine months ended September 30, 2023 and 2022 was $0.9 million and $5.0 million, respectively. Changes in options, all of which relate to the Company’s Common Stock, were as follows for the nine months ended September 30, 2023: Weighted- Number of Average Aggregate Outstanding at January 1, 2023 $ 51.22 2,481,606 Exercised 43.12 (356,007) Forfeited 65.03 (6,471) Outstanding at September 30, 2023 52.54 2,119,128 7 years $ 31.3 Exercisable at September 30, 2023 49.52 1,795,586 6 years $ 30.7 The weighted-average fair value per option at the date of grant during the nine months ended September 30, 2022 using the Black-Scholes option-pricing model was $17.57. Assumptions were as follows: Nine Months Ended September 30, 2022 Expected life (years) 5.7 Risk-free interest rate 1.9 % Dividend yield 1.5 % Expected volatility 26.8 % The expected lives of options for purposes of these models are based on historical exercise behavior. The risk-free interest rates for purposes of these models are based on the U.S. Treasury yield in effect on the date of grant for the respective expected lives of the option. The expected dividend yields for purposes of these models are based on the dividends paid in the preceding four quarters divided by the grant date market value of the Common Stock. The expected volatility for purposes of these models is based on the historical volatility of the Common Stock. Share Units Participants in the Incentive Plan may also be awarded share units. Share units vest three years after the date of grant. The Company granted 168,688 and 94,604 share units under the Incentive Plan in the nine months ended September 30, 2023 and 2022, respectively. The share units were valued at $11.3 million and $6.9 million at the date of issuance in 2023 and 2022, respectively, based on the price of the Company’s Common Stock at the date of grant. The share units are recognized as compensation expense ratably over the three-year vesting period; however, included in share unit expense in the three and nine months ended September 30, 2023 and 2022 was expense associated with accelerated vesting of share unit awards for certain employees who are retirement eligible or will become retirement eligible during the vesting period. Stock based compensation expense attributable to share units of $1.1 million and $1.0 million was recognized in the three months ended September 30, 2023 and 2022, respectively. Stock based compensation expense attributable to share units of $8.7 million and $5.5 million was recognized in the nine months ended September 30, 2023 and 2022, respectively. Certain non-U.S.-based employees receive the cash value of the share price at the vesting date in lieu of shares. Unvested cash-settled awards are remeasured at each reporting period. A summary of share unit activity under the Incentive Plan is as follows for the nine months ended September 30, 2023: Number of Units Weighted-Average Issued and unvested at January 1, 2023 379,919 $ 52.92 Granted 168,688 67.18 Vested (159,028) 49.41 Forfeited (5,684) 66.26 Issued and unvested at September 30, 2023 383,895 63.29 Performance Stock Units Beginning in 2023, certain executives may be awarded performance stock units under the Incentive Plan. Performance stock units vest over three years following the date of the grant. Performance stock units vest under a set of measurement criteria which are based upon achievement of certain Environmental, Social, and Governance targets. Potential payouts range from zero to 150% of the target awards and changes from target amounts are reflected as performance adjustments. The Company granted 24,580 performance stock units under the Incentive Plan in the nine months ended September 30, 2023. The performance stock units were valued at $1.7 million at the date of issuance in 2023, based on the price of the Company’s Common Stock at the date of grant of $67.14. The performance stock units are recognized as compensation expense ratably over the three-year vesting period. Stock based compensation expense attributable to performance stock units of $0.2 million and $0.5 million was recognized in the three and nine months ended September 30, 2023, respectively. Certain non-U.S.-based executives receive the cash value of the share price at the vesting date in lieu of shares. Unvested cash-settled awards are remeasured at each reporting period. A summary of stock unit activity under the Incentive Plan is as follows for the nine months ended September 30, 2023: Number of Units Weighted-Average Issued and unvested at January 1, 2023 — $ — Granted 24,580 67.14 Forfeited (557) 67.14 Performance adjustments 12,285 67.14 Issued and unvested at September 30, 2023 36,308 67.14

Pensions

Pensions	9 Months Ended
Pensions	Sep. 30, 2023
Retirement Benefits [Abstract]
Pensions	Pensions The following table presents the components of the Company’s net pension expense: (dollars in millions) Three Months Ended Nine Months Ended 2023 2022 2023 2022 Service cost $ 0.2 $ 0.4 $ 0.7 $ 1.1 Interest cost 0.3 3.6 0.9 10.9 Expected return on plan assets (0.3) (5.4) (0.9) (16.1) Amortization of unrecognized loss — 5.1 0.1 15.3 Amortization of prior service cost — (0.1) 0.1 (0.3) Defined benefit plan expense before settlement income 0.2 3.6 0.9 10.9 Settlement income — — (6.0) — Total pension (income) expense $ 0.2 $ 3.6 $ (5.1) $ 10.9 The service cost component of net periodic benefit cost is presented within cost of products sold and selling, general and administrative expenses within the condensed consolidated statements of earnings while the other components of pension expense are reflected in other (income) expense, net. The Company was not required to and did not make a contribution to its U.S. pension plan in 2022. The Company is not required to make a contribution in 2023. In 2021, the Company's Board of Directors approved the termination of the Company's largest defined benefit pension plan (the Plan) with a termination date of December 31, 2021. The Plan represented over 95 percent of the Company's pension plan liability. In the fourth quarter of 2022, the Company settled Plan liabilities through lump-sum payments from existing plan assets to eligible participants who elected to receive them and through the purchase of annuities from Mass Mutual Life Insurance Company (MML). In the second quarter of 2023, the Company realized pre-tax pension settlement income of $6.0 million, of which $5.0 million was recorded in the North America segment and $1.0 million in Corporate Expense, and included $1.5 million in related tax benefits. The pension settlement income related to refunds from MML to the Plan for the final reconciliation of participant data. The remaining pension assets associated with the Plan at September 30, 2023 were $27.4 million. The Company intends to use the remaining assets to fund future non-elective contributions to the Company’s defined contribution plan. For additional information regarding the termination of the Plan and the Company’s defined contribution plan, refer to the Company's Annual Report on Form 10-K for the year ended December 31, 2022 filed with the SEC on February 14, 2023.

Segment Results

Segment Results	9 Months Ended
Segment Results	Sep. 30, 2023
Segment Reporting [Abstract]
Segment Results	Segment Results The Company is comprised of two reporting segments: North America and Rest of World. The Rest of World segment is primarily comprised of China, Europe and India. Both segments manufacture and market comprehensive lines of residential and commercial gas and electric water heaters, boilers, tanks, and water treatment products. Both segments primarily manufacture and market in their respective regions of the world. The following table presents the Company’s segment results: (dollars in millions) Three Months Ended Nine Months Ended 2023 2022 2023 2022 Net sales North America $ 709.9 $ 652.9 $ 2,184.9 $ 2,127.1 Rest of World 233.4 230.2 696.7 716.1 Inter-segment (5.8) (8.9) (16.9) (25.4) $ 937.5 $ 874.2 $ 2,864.7 $ 2,817.8 Segment earnings North America (1) $ 170.0 $ 141.8 $ 557.7 $ 453.5 Rest of World (2) 23.2 21.8 56.8 64.7 Inter-segment earnings elimination — — — (0.1) 193.2 163.6 614.5 518.1 Corporate expense (3) (14.4) (16.5) (47.0) (45.5) Interest expense (2.4) (2.4) (10.9) (6.0) Earnings before income taxes 176.4 144.7 556.6 466.6 Provision for income taxes 41.0 34.9 137.3 110.8 Net earnings $ 135.4 $ 109.8 $ 419.3 $ 355.8 Additional Information (1) Adjustments: North America includes pension settlement income of: $ — $ — $ (5.0) $ — includes pension expense of: $ — $ 2.6 $ — $ 7.8 includes legal judgment income of: $ — $ (11.5) $ — $ (11.5) (2) Adjustments: Rest of World includes impairment expense of: $ — $ — $ 12.5 $ — (3) Adjustments: Corporate expense includes terminated acquisition-related expenses of: $ — $ 4.3 $ — $ 4.3 includes pension settlement income of: $ — $ — $ (1.0) $ — includes impairment expense of: $ — $ — $ 3.1 $ — includes pension expense of: $ — $ 0.4 $ — $ 1.1

Fair Value Measurements

Fair Value Measurements	9 Months Ended
Fair Value Measurements	Sep. 30, 2023
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Accounting Standards Codification (ASC) 820, Fair Value Measurements , among other things, defines fair value, establishes a consistent framework for measuring fair value and expands disclosure for each major asset and liability category measured at fair value on either a recurring basis or nonrecurring basis. ASC 820 clarifies that fair value is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability. As a basis for considering such assumptions, ASC 820 establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value as follows: (Level 1) observable inputs such as quoted prices in active markets; (Level 2) inputs, other than the quoted prices in active markets, that are observable either directly or indirectly; and (Level 3) unobservable inputs in which there is little or no market data, which require the reporting entity to develop its own assumptions. Assets and liabilities measured at fair value are based on the market approach which are prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities. Assets (liabilities) measured at fair value on a recurring basis are as follows (dollars in millions): Fair Value Measurement Using Balance Sheet Location September 30, December 31, 2022 Quoted prices in active markets for identical assets (Level 1) Marketable Securities $ 60.8 $ 90.6 Significant other observable inputs (Level 2) Other current assets 4.7 6.5 Items measured at fair value were comprised of the Company’s marketable securities (Level 1) and derivative instruments (Level 2). There were no changes in the Company's valuation techniques used to measure fair values on a recurring basis during the nine months ended September 30, 2023.

Derivative Instruments

Derivative Instruments	9 Months Ended
Derivative Instruments	Sep. 30, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	Derivative Instruments The Company utilizes certain derivative instruments to enhance its ability to manage currency exposure as well as raw materials price risk. Derivative instruments are entered into for periods consistent with the related underlying exposures and do not constitute positions independent of those exposures. The Company does not enter into contracts for speculative purposes. The contracts are executed with major financial institutions with no credit loss anticipated for failure of the counterparties to perform. Cash Flow Hedges With the exception of its net investment hedges, the Company designates all of its hedging instruments as cash flow hedges. For derivative instruments that are designated and qualify as a cash flow hedge (i.e., hedging the exposure to variability in expected future cash flows that is attributable to a particular risk), gains or losses on the derivative instrument are reported as a component of other comprehensive loss, net of tax, and are reclassified into earnings in the same line item associated with the forecasted transaction and in the same period or periods during which the hedged transaction affects earnings. Foreign Currency Forward Contracts The Company is exposed to foreign currency exchange risk as a result of transactions in currencies other than the functional currency of certain subsidiaries. The Company utilizes foreign currency forward purchase and sale contracts to manage the volatility associated with foreign currency purchases, sales and certain intercompany transactions in the normal course of business. Principal currencies for which the Company utilizes foreign currency forward contracts include the British pound, Canadian dollar, Euro and Mexican peso. Gains and losses on these instruments are recorded in accumulated other comprehensive loss, net of tax, until the underlying transaction is recorded in earnings. When the hedged item is realized, gains or losses are reclassified from accumulated other comprehensive loss to the consolidated statement of earnings. The assessment of effectiveness for forward contracts is based on changes in the forward rates. These hedges have been determined to be effective. The majority of the amounts in accumulated other comprehensive loss for cash flow hedges are expected to be reclassified into earnings within one year. The following table summarizes, by currency, the contractual amounts of the Company’s foreign currency forward contracts that are designated as cash flow hedges: (dollars in millions) September 30, 2023 December 31, 2022 Buy Sell Buy Sell British pound $ — $ 0.4 $ — $ — Canadian dollar — 73.4 — 76.8 Euro 16.9 — 30.2 — Mexican peso 12.3 — 15.7 — Total $ 29.2 $ 73.8 $ 45.9 $ 76.8 Net Investment Hedges The Company enters into certain foreign currency forward contracts to hedge the exposure to a portion of the Company’s net investments in certain non-U.S. subsidiaries against the effect of exchange rate fluctuations on the translation of foreign currency balances to the U.S. dollar. For the derivative instruments that are designated and qualify as net investment hedges, gains and losses are reported in other comprehensive loss where they offset gains and losses recorded on the Company’s net investments in its non-U.S. subsidiaries. These hedges are determined to be effective. The Company recognized $(0.2) million and zero of after-tax losses associated with hedges of net investments in non-U.S. subsidiaries in currency translation adjustment in other comprehensive loss in the three months ended September 30, 2023 and September 30, 2022, respectively. The Company recognized $1.1 million and $1.4 million of after-tax gains associated with hedges of a net investment in non-U.S. subsidiaries in currency translation adjustment in other comprehensive loss in the nine months ended September 30, 2023 and September 30, 2022, respectively. The contractual amount of the Company's foreign currency forward contracts that are designated as net investment hedges was $204.0 million as of September 30, 2023. The following tables present the impact of derivative contracts on the Company’s financial statements. Fair value of derivatives designated as hedging instruments under ASC 815: (dollars in millions) Balance Sheet Location September 30, December 31, Foreign currency contracts Other current assets $ 4.2 $ 6.4 The effect of cash flow hedges on the condensed consolidated statement of earnings: Three Months Ended September 30 (dollars in millions): Derivatives in ASC 815 cash flow hedging relationships Amount of gain recognized in other Location of gain Amount of gain 2023 2022 2023 2022 Foreign currency contracts $ 1.4 $ 5.7 Cost of products sold $ 2.5 $ 1.0 Nine Months Ended September 30 (dollars in millions): Derivatives in ASC 815 cash flow hedging relationships Amount of gain recognized in other Location of gain Amount of gain 2023 2022 2023 2022 Foreign currency contracts $ 3.6 $ 8.5 Cost of products sold $ 6.7 $ 1.8 Balance Sheet Hedges Foreign Exchange Contracts The Company periodically enters into foreign exchange contracts to mitigate the foreign currency volatility relative to certain intercompany loans. These foreign exchange contracts did not qualify for hedge accounting in accordance with ASC 815 and as such were marked to market through earnings. The fair value of the foreign exchange contracts was an asset balance of $0.5 million as of September 30, 2023 which was recorded in Other current assets within the consolidated balance sheet. The fair value of the foreign exchange contracts was an asset balance of $0.1 million as of December 31, 2022 and recorded in Other current assets within the consolidated balance sheet. The following table summarizes the contractual amounts of the Company's foreign exchange contracts that are designated as balance sheet hedges: (dollars in millions) September 30, 2023 December 31, 2022 Buy Sell Buy Sell Canadian dollar $ — $ 45.5 $ — $ 81.5 Chinese yuan 200.6 — — — The amounts recognized within the consolidated statements of earnings related to the Company's foreign exchange contracts are set forth below. Three Months Ended September 30 (dollars in millions): Derivatives not designated as hedging instruments: Location within the consolidated statements of earnings 2023 2022 Foreign exchange contracts Other expense (income) - net $ 1.1 $ 0.4 Nine Months Ended September 30 (dollars in millions): Derivatives not designated as hedging instruments: Location within the consolidated statements of earnings 2023 2022 Foreign exchange contracts Other expense (income) - net $ 1.1 $ 1.5

Income Taxes

Income Taxes	9 Months Ended
Income Taxes	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Income Taxes	Income TaxesThe Company’s effective income tax rate for the three and nine months ended September 30, 2023 was 23.2 percent and 24.7 percent, respectively. The Company estimates that its annual effective income tax rate for the full year 2023 will be approximately 24 percent. The effective income tax rate for the three and nine months ended September 30, 2022 was 24.1 percent and 23.7 percent, respectively. The change in the effective income tax rate for the three and nine months ended September 30, 2023 compared to the effective income tax rate for the three and nine months ended September 30, 2022 was primarily due to a change in geographical earnings mix. In addition, results in the nine months ended September 30, 2023 included a $15.6 million impairment expense recorded with no associated tax benefit. Refer to Note 3 - Acquisition and Disposition for additional information regarding the impairment expense. As of September 30, 2023, the Company had $15.0 million of unrecognized tax benefits of which $2.9 million would affect its effective income tax rate if recognized. The Company recognizes potential interest and penalties related to unrecognized tax benefits as a component of income tax expense. The Company’s U.S. federal income tax returns and its U.S. state and local income tax returns are subject to audit for the years 2017-2023 and 2009-2023, respectively. The Company is subject to examinations in foreign tax jurisdictions for the years 2017-2023.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies The Company maintains a commercial relationship with a supply-chain service provider (the Provider) in connection with the Company’s business in China. In this capacity, the Provider offers order-entry, warehousing and logistics support. The Provider also offers asset-backed financing to certain of the Company’s distributors in China to facilitate their working capital needs. To facilitate its financing support business, the Provider has collateralized lending facilities in place with multiple Chinese banks under which the Company has agreed to repurchase inventory if both requested by the banks and certain defined conditions are met, primarily related to the aging of the distributors’ notes. The Provider is required to indemnify the Company for any losses the Company would incur in the event of an inventory repurchase under these arrangements. Potential losses under the repurchase arrangements represent the difference between the repurchase price and net proceeds from the resale of product plus costs incurred in the process, less related distributor rebates. Before considering any reduction of distributor rebate accruals of $1.0 million and $1.1 million as of September 30, 2023 and December 31, 2022, respectively, and from the resale of the related inventory, the gross amount the Company would be obligated to repurchase, which would be contingent on the default of all of the outstanding loans, was approximately $1.7 million as of September 30, 2023 and $2.4 million as of December 31, 2022. The Company’s reserves for estimated losses under repurchase arrangements were immaterial as of September 30, 2023 and December 31, 2022.

Changes in Accumulated Other Co

Changes in Accumulated Other Comprehensive Loss by Component	9 Months Ended
	Sep. 30, 2023
Equity [Abstract]
Changes in Accumulated Other Comprehensive Loss by Component	Changes in Accumulated Other Comprehensive Loss by Component Changes to accumulated other comprehensive loss by component are as follows: (dollars in millions) Three Months Ended 2023 2022 Cumulative foreign currency translation Balance at beginning of period $ (82.6) $ (68.7) Other comprehensive loss before reclassifications (6.9) (28.9) Balance at end of period (89.5) (97.6) Unrealized net gain on cash flow derivatives Balance at beginning of period 3.3 2.1 Other comprehensive gain before reclassifications 1.1 4.3 Realized gains on derivatives reclassified to cost of products sold (net of income tax provision of $0.6 and $0.2 in 2023 and 2022, respectively) (1.9) (0.8) Balance at end of period 2.5 5.6 Pension liability Balance at beginning of period (3.1) (279.8) Amounts reclassified from accumulated other comprehensive loss: (1) — 3.7 Balance at end of period (3.1) (276.1) Accumulated other comprehensive loss, end of period $ (90.1) $ (368.1) (1) Amortization of pension items: Actuarial losses $ — $ 5.1 (2) Prior year service cost — (0.1) (2) — 5.0 Income tax benefit — (1.3) Reclassification net of income tax benefit $ — $ 3.7 (2) These accumulated other comprehensive loss components are included in the computation of net periodic pension cost. See Note 10 - Pensions for additional details. Changes to accumulated other comprehensive loss by component are as follows: (dollars in millions) Nine Months Ended 2023 2022 Cumulative foreign currency translation Balance at beginning of period $ (84.1) $ (44.7) Other comprehensive loss before reclassifications (5.4) (52.9) Balance at end of period (89.5) (97.6) Unrealized net gain on cash flow derivatives Balance at beginning of period 4.9 0.6 Other comprehensive gain before reclassifications 2.7 6.4 Realized gains on derivatives reclassified to cost of products sold (net of income tax provision of $1.6 and $0.4 in 2023 and 2022, respectively) (5.1) (1.4) Balance at end of period 2.5 5.6 Pension liability Balance at beginning of period (3.2) (287.3) Amounts reclassified from accumulated other comprehensive loss: (1) 0.1 11.2 Balance at end of period (3.1) (276.1) Accumulated other comprehensive loss, end of period $ (90.1) $ (368.1) (1) Amortization of pension items: Actuarial losses $ 0.1 $ 15.3 (2) Prior year service cost 0.1 (0.3) (2) 0.2 15.0 Income tax benefit (0.1) (3.8) Reclassification net of income tax benefit $ 0.1 $ 11.2 (2) These accumulated other comprehensive loss components are included in the computation of net periodic pension cost. See Note 10 - Pensions for additional details.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Pay vs Performance Disclosure
Net earnings	$ 135.4	$ 109.8	$ 419.3	$ 355.8

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Sep. 30, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Basis of Presentation (Policies

Basis of Presentation (Policies)	9 Months Ended
Basis of Presentation (Policies)	Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements No recent accounting pronouncements are expected to have an impact on our condensed consolidated financial statements.

Revenue Recognition (Tables)

Revenue Recognition (Tables)	9 Months Ended
Revenue Recognition (Tables)	Sep. 30, 2023
Revenue from Contract with Customer [Abstract]
Net Sales Disaggregated by Segment and Major Product Line	The following table disaggregates the Company’s net sales by segment. As described above, the Company’s North America segment sales are further disaggregated by major product line. In addition, the Company’s Rest of World segment sales are disaggregated by China and all other Rest of World: (dollars in millions) Three Months Ended Nine Months Ended 2023 2022 2023 2022 North America Water heaters and related parts $ 593.7 $ 525.6 $ 1,833.6 $ 1,755.3 Boilers and related parts 61.8 75.5 181.5 203.4 Water treatment products 54.4 51.8 169.8 168.4 Total North America 709.9 652.9 2,184.9 2,127.1 Rest of World China $ 201.3 $ 194.3 $ 609.2 $ 624.1 All other Rest of World 32.1 35.9 87.5 92.0 Total Rest of World 233.4 230.2 696.7 716.1 Inter-segment sales (5.8) (8.9) (16.9) (25.4) Total Net Sales $ 937.5 $ 874.2 $ 2,864.7 $ 2,817.8

Leases (Tables)

Leases (Tables)	9 Months Ended
Leases (Tables)	Sep. 30, 2023
Leases [Abstract]
Schedule of Supplemental Balance Sheet Related to Leases	Supplemental balance sheet information related to leases is as follows: (dollars in millions) September 30, December 31, 2022 Liabilities Short term: Accrued liabilities $ 9.4 $ 9.9 Long term: Operating lease liabilities 26.0 22.4 Total operating lease liabilities $ 35.4 $ 32.3 Less: Rent incentives and deferrals (2.1) (2.5) Assets Operating lease assets $ 33.3 $ 29.8 Lease Term and Discount Rate September 30, 2023 Weighted-average remaining lease term 7.1 years Weighted-average discount rate 4.10 %
Schedule of Components of Lease Expense	The components of lease expense were as follows: (dollars in millions) Three months ended Lease Expense Classification 2023 (1) 2022 (2) Operating lease expense Cost of products sold $ 1.5 $ 0.7 Selling, general and administrative expenses 3.9 4.1 (1) 2023 includes short-term and variable lease expenses of $1.2 million and $1.0 million, respectively. (2) 2022 includes short-term and variable lease expenses of $0.5 million and $0.8 million, respectively. (dollars in millions) Nine Months Ended Lease Expense Classification 2023 (1) 2022 (2) Operating lease expense Cost of products sold $ 4.1 $ 2.7 Selling, general and administrative expenses 12.3 12.4 (1) 2023 includes short-term and variable lease expenses of $3.4 million and $3.4 million, respectively. (2) 2022 includes short-term and variable lease expenses of $1.6 million and $2.5 million, respectively.
Schedule of Maturities of Lease Liabilities	Maturities of lease liabilities were as follows: (dollars in millions) September 30, 2023 $ 2.9 2024 9.8 2025 7.2 2026 5.2 2027 3.5 After 2027 13.2 Total lease payments 41.8 Less: Imputed interest (6.4) Present value of operating lease liabilities $ 35.4

Inventories (Tables)

Inventories (Tables)	9 Months Ended
Inventories (Tables)	Sep. 30, 2023
Inventory Disclosure [Abstract]
Schedule of Inventories	The following table presents the components of the Company’s inventory balances: (dollars in millions) September 30, December 31, 2022 Finished products $ 187.0 $ 174.4 Work in process 47.0 42.1 Raw materials 334.0 349.2 Inventories, at FIFO cost 568.0 565.7 LIFO reserve (49.0) (49.3) Inventories, at LIFO cost $ 519.0 $ 516.4

Product Warranties (Tables)

Product Warranties (Tables)	9 Months Ended
Product Warranties (Tables)	Sep. 30, 2023
Guarantees and Product Warranties [Abstract]
Schedule of Warranty Liability Activity	The following table presents the Company’s warranty liability activity: (dollars in millions) Three Months Ended 2023 2022 Balance at July 1, $ 180.7 $ 180.0 Expense 18.6 14.0 Claims settled (17.6) (16.8) Balance at September 30, $ 181.7 $ 177.2 (dollars in millions) Nine Months Ended 2023 2022 Balance at January 1, $ 182.5 $ 184.4 Expense 55.3 42.6 Claims settled (56.1) (49.8) Balance at September 30, $ 181.7 $ 177.2

Earnings per Share of Common _2

Earnings per Share of Common Stock (Tables)	9 Months Ended
Earnings per Share of Common Stock (Tables)	Sep. 30, 2023
Earnings Per Share [Abstract]
Schedule of Computation of Basic and Diluted Weighted Average Shares Used in EPS Calculations	The following table sets forth the computation of basic and diluted weighted-average shares used in the earnings per share calculations: Three Months Ended Nine Months Ended 2023 2022 2023 2022 Denominator for basic earnings per share - weighted average shares 150,103,113 154,197,072 150,488,897 155,625,624 Effect of dilutive stock options and share units 1,106,861 877,790 1,058,910 1,037,520 Denominator for diluted earnings per share 151,209,974 155,074,862 151,547,807 156,663,144

Stock Based Compensation (Table

Stock Based Compensation (Tables)	9 Months Ended
Stock Based Compensation (Tables)	Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]
Schedule of Changes in Options	Changes in options, all of which relate to the Company’s Common Stock, were as follows for the nine months ended September 30, 2023: Weighted- Number of Average Aggregate Outstanding at January 1, 2023 $ 51.22 2,481,606 Exercised 43.12 (356,007) Forfeited 65.03 (6,471) Outstanding at September 30, 2023 52.54 2,119,128 7 years $ 31.3 Exercisable at September 30, 2023 49.52 1,795,586 6 years $ 30.7
Schedule of Assumptions	Assumptions were as follows: Nine Months Ended September 30, 2022 Expected life (years) 5.7 Risk-free interest rate 1.9 % Dividend yield 1.5 % Expected volatility 26.8 %
Schedule of Share Unit Activity	A summary of share unit activity under the Incentive Plan is as follows for the nine months ended September 30, 2023: Number of Units Weighted-Average Issued and unvested at January 1, 2023 379,919 $ 52.92 Granted 168,688 67.18 Vested (159,028) 49.41 Forfeited (5,684) 66.26 Issued and unvested at September 30, 2023 383,895 63.29
Schedule of Stock Unit Activity	A summary of stock unit activity under the Incentive Plan is as follows for the nine months ended September 30, 2023: Number of Units Weighted-Average Issued and unvested at January 1, 2023 — $ — Granted 24,580 67.14 Forfeited (557) 67.14 Performance adjustments 12,285 67.14 Issued and unvested at September 30, 2023 36,308 67.14

Pensions (Tables)

Pensions (Tables)	9 Months Ended
Pensions (Tables)	Sep. 30, 2023
Retirement Benefits [Abstract]
Schedule of Components of Net Pension Expense (Income)	The following table presents the components of the Company’s net pension expense: (dollars in millions) Three Months Ended Nine Months Ended 2023 2022 2023 2022 Service cost $ 0.2 $ 0.4 $ 0.7 $ 1.1 Interest cost 0.3 3.6 0.9 10.9 Expected return on plan assets (0.3) (5.4) (0.9) (16.1) Amortization of unrecognized loss — 5.1 0.1 15.3 Amortization of prior service cost — (0.1) 0.1 (0.3) Defined benefit plan expense before settlement income 0.2 3.6 0.9 10.9 Settlement income — — (6.0) — Total pension (income) expense $ 0.2 $ 3.6 $ (5.1) $ 10.9

Segment Results (Tables)

Segment Results (Tables)	9 Months Ended
Segment Results (Tables)	Sep. 30, 2023
Segment Reporting [Abstract]
Schedule of Segment Results	The following table presents the Company’s segment results: (dollars in millions) Three Months Ended Nine Months Ended 2023 2022 2023 2022 Net sales North America $ 709.9 $ 652.9 $ 2,184.9 $ 2,127.1 Rest of World 233.4 230.2 696.7 716.1 Inter-segment (5.8) (8.9) (16.9) (25.4) $ 937.5 $ 874.2 $ 2,864.7 $ 2,817.8 Segment earnings North America (1) $ 170.0 $ 141.8 $ 557.7 $ 453.5 Rest of World (2) 23.2 21.8 56.8 64.7 Inter-segment earnings elimination — — — (0.1) 193.2 163.6 614.5 518.1 Corporate expense (3) (14.4) (16.5) (47.0) (45.5) Interest expense (2.4) (2.4) (10.9) (6.0) Earnings before income taxes 176.4 144.7 556.6 466.6 Provision for income taxes 41.0 34.9 137.3 110.8 Net earnings $ 135.4 $ 109.8 $ 419.3 $ 355.8 Additional Information (1) Adjustments: North America includes pension settlement income of: $ — $ — $ (5.0) $ — includes pension expense of: $ — $ 2.6 $ — $ 7.8 includes legal judgment income of: $ — $ (11.5) $ — $ (11.5) (2) Adjustments: Rest of World includes impairment expense of: $ — $ — $ 12.5 $ — (3) Adjustments: Corporate expense includes terminated acquisition-related expenses of: $ — $ 4.3 $ — $ 4.3 includes pension settlement income of: $ — $ — $ (1.0) $ — includes impairment expense of: $ — $ — $ 3.1 $ — includes pension expense of: $ — $ 0.4 $ — $ 1.1

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
Fair Value Measurements (Tables)	Sep. 30, 2023
Fair Value Disclosures [Abstract]
Schedule of Assets (Liabilities) Measured at Fair Value on a Recurring Basis	Assets (liabilities) measured at fair value on a recurring basis are as follows (dollars in millions): Fair Value Measurement Using Balance Sheet Location September 30, December 31, 2022 Quoted prices in active markets for identical assets (Level 1) Marketable Securities $ 60.8 $ 90.6 Significant other observable inputs (Level 2) Other current assets 4.7 6.5

Derivative Instruments (Tables)

Derivative Instruments (Tables)	9 Months Ended
Derivative Instruments (Tables)	Sep. 30, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Contractual Amounts for Derivative Contracts	The following table summarizes, by currency, the contractual amounts of the Company’s foreign currency forward contracts that are designated as cash flow hedges: (dollars in millions) September 30, 2023 December 31, 2022 Buy Sell Buy Sell British pound $ — $ 0.4 $ — $ — Canadian dollar — 73.4 — 76.8 Euro 16.9 — 30.2 — Mexican peso 12.3 — 15.7 — Total $ 29.2 $ 73.8 $ 45.9 $ 76.8 The following table summarizes the contractual amounts of the Company's foreign exchange contracts that are designated as balance sheet hedges: (dollars in millions) September 30, 2023 December 31, 2022 Buy Sell Buy Sell Canadian dollar $ — $ 45.5 $ — $ 81.5 Chinese yuan 200.6 — — —
Schedule of Impact of Derivative Contracts on the Company's Financial Statements	The following tables present the impact of derivative contracts on the Company’s financial statements. Fair value of derivatives designated as hedging instruments under ASC 815: (dollars in millions) Balance Sheet Location September 30, December 31, Foreign currency contracts Other current assets $ 4.2 $ 6.4
Schedule of Effect of Derivatives on the Statement of Earnings	The effect of cash flow hedges on the condensed consolidated statement of earnings: Three Months Ended September 30 (dollars in millions): Derivatives in ASC 815 cash flow hedging relationships Amount of gain recognized in other Location of gain Amount of gain 2023 2022 2023 2022 Foreign currency contracts $ 1.4 $ 5.7 Cost of products sold $ 2.5 $ 1.0 Nine Months Ended September 30 (dollars in millions): Derivatives in ASC 815 cash flow hedging relationships Amount of gain recognized in other Location of gain Amount of gain 2023 2022 2023 2022 Foreign currency contracts $ 3.6 $ 8.5 Cost of products sold $ 6.7 $ 1.8 The amounts recognized within the consolidated statements of earnings related to the Company's foreign exchange contracts are set forth below. Three Months Ended September 30 (dollars in millions): Derivatives not designated as hedging instruments: Location within the consolidated statements of earnings 2023 2022 Foreign exchange contracts Other expense (income) - net $ 1.1 $ 0.4 Nine Months Ended September 30 (dollars in millions): Derivatives not designated as hedging instruments: Location within the consolidated statements of earnings 2023 2022 Foreign exchange contracts Other expense (income) - net $ 1.1 $ 1.5

Changes in Accumulated Other _2

Changes in Accumulated Other Comprehensive Loss by Component (Tables)	9 Months Ended
	Sep. 30, 2023
Equity [Abstract]
Changes to Accumulated Other Comprehensive Loss by Component	Changes to accumulated other comprehensive loss by component are as follows: (dollars in millions) Three Months Ended 2023 2022 Cumulative foreign currency translation Balance at beginning of period $ (82.6) $ (68.7) Other comprehensive loss before reclassifications (6.9) (28.9) Balance at end of period (89.5) (97.6) Unrealized net gain on cash flow derivatives Balance at beginning of period 3.3 2.1 Other comprehensive gain before reclassifications 1.1 4.3 Realized gains on derivatives reclassified to cost of products sold (net of income tax provision of $0.6 and $0.2 in 2023 and 2022, respectively) (1.9) (0.8) Balance at end of period 2.5 5.6 Pension liability Balance at beginning of period (3.1) (279.8) Amounts reclassified from accumulated other comprehensive loss: (1) — 3.7 Balance at end of period (3.1) (276.1) Accumulated other comprehensive loss, end of period $ (90.1) $ (368.1) (1) Amortization of pension items: Actuarial losses $ — $ 5.1 (2) Prior year service cost — (0.1) (2) — 5.0 Income tax benefit — (1.3) Reclassification net of income tax benefit $ — $ 3.7 (2) These accumulated other comprehensive loss components are included in the computation of net periodic pension cost. See Note 10 - Pensions for additional details. Changes to accumulated other comprehensive loss by component are as follows: (dollars in millions) Nine Months Ended 2023 2022 Cumulative foreign currency translation Balance at beginning of period $ (84.1) $ (44.7) Other comprehensive loss before reclassifications (5.4) (52.9) Balance at end of period (89.5) (97.6) Unrealized net gain on cash flow derivatives Balance at beginning of period 4.9 0.6 Other comprehensive gain before reclassifications 2.7 6.4 Realized gains on derivatives reclassified to cost of products sold (net of income tax provision of $1.6 and $0.4 in 2023 and 2022, respectively) (5.1) (1.4) Balance at end of period 2.5 5.6 Pension liability Balance at beginning of period (3.2) (287.3) Amounts reclassified from accumulated other comprehensive loss: (1) 0.1 11.2 Balance at end of period (3.1) (276.1) Accumulated other comprehensive loss, end of period $ (90.1) $ (368.1) (1) Amortization of pension items: Actuarial losses $ 0.1 $ 15.3 (2) Prior year service cost 0.1 (0.3) (2) 0.2 15.0 Income tax benefit (0.1) (3.8) Reclassification net of income tax benefit $ 0.1 $ 11.2 (2) These accumulated other comprehensive loss components are included in the computation of net periodic pension cost. See Note 10 - Pensions for additional details.

Revenue Recognition - Narrative

Revenue Recognition - Narrative (Details) distributor in Thousands, $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($) segment distributor	Dec. 31, 2022 USD ($)
Disaggregation of Revenue [Line Items]
Customer deposits liability	$ 155.9	$ 85.7
Allowance for credit losses	$ 9.3	$ 9.5
Number of reporting segments \| segment	2
Water Heaters \| North America
Disaggregation of Revenue [Line Items]
Number of wholesale distributors (more than) \| distributor	1
Minimum
Disaggregation of Revenue [Line Items]
Payment terms	30 days
Maximum
Disaggregation of Revenue [Line Items]
Payment terms	90 days

Revenue Recognition - Segment S

Revenue Recognition - Segment Sales Disaggregated by Major Product Line (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Net sales	$ 937.5	$ 874.2	$ 2,864.7	$ 2,817.8
Operating Segments \| North America
Disaggregation of Revenue [Line Items]
Net sales	709.9	652.9	2,184.9	2,127.1
Operating Segments \| Rest of World
Disaggregation of Revenue [Line Items]
Net sales	233.4	230.2	696.7	716.1
Operating Segments \| Rest of World \| China
Disaggregation of Revenue [Line Items]
Net sales	201.3	194.3	609.2	624.1
Operating Segments \| Rest of World \| All other Rest of World
Disaggregation of Revenue [Line Items]
Net sales	32.1	35.9	87.5	92
Operating Segments \| Water heaters and related parts \| North America
Disaggregation of Revenue [Line Items]
Net sales	593.7	525.6	1,833.6	1,755.3
Operating Segments \| Boilers and related parts \| North America
Disaggregation of Revenue [Line Items]
Net sales	61.8	75.5	181.5	203.4
Operating Segments \| Water treatment products \| North America
Disaggregation of Revenue [Line Items]
Net sales	54.4	51.8	169.8	168.4
Inter-segment
Disaggregation of Revenue [Line Items]
Net sales	$ (5.8)	$ (8.9)	$ (16.9)	$ (25.4)

Acquisition and Disposition (De

Acquisition and Disposition (Details) - USD ($) $ in Millions	2 Months Ended	3 Months Ended			9 Months Ended
	Jun. 30, 2023	Sep. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Impaired Long-Lived Assets Held and Used [Line Items]
Aggregate cash purchase price, net of cash acquired					$ 16.1	$ 8
Impairment expense		$ 0		$ 0	15.6	0
Privately-Held Water Treatment Company
Impaired Long-Lived Assets Held and Used [Line Items]
Aggregate cash purchase price, net of cash acquired		16.1
Disposal Group, Held-for-sale, Not Discontinued Operations
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment expense			$ 15.6		15.6
Carrying value of disposal group			0.6
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Accumulated Other Comprehensive Loss
Impaired Long-Lived Assets Held and Used [Line Items]
Foreign currency translation losses released from accumulated other comprehensive loss	$ 11				11
Impairment Recorded as Net Reduction to Assets and Liabilities \| Disposal Group, Held-for-sale, Not Discontinued Operations
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment expense			4.5
Impairment Recorded for Anticipated Liquidation of Cumulative Foreign Currency Translation Adjustment Recorded in Accrued Liabilities \| Disposal Group, Held-for-sale, Not Discontinued Operations
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment expense			11.1
Corporate
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment expense		0		0	3.1	0
Corporate \| Disposal Group, Held-for-sale, Not Discontinued Operations
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment expense			3.1
Rest of World \| Operating Segments
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment expense		$ 0		$ 0	$ 12.5	$ 0
Rest of World \| Operating Segments \| Disposal Group, Held-for-sale, Not Discontinued Operations
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment expense			$ 12.5

Leases - Narrative (Details)

Leases - Narrative (Details)	9 Months Ended
Leases - Narrative (Details)	Sep. 30, 2023
Lessee, Lease, Description [Line Items]
Operating lease termination period	1 year
Minimum
Lessee, Lease, Description [Line Items]
Operating lease renewal term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Operating lease renewal term	5 years

Leases - Supplemental Balance S

Leases - Supplemental Balance Sheet (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Liabilities
Current operating lease liability, statement of financial position [Extensible List]	Accrued liabilities	Accrued liabilities
Short term: Accrued liabilities	$ 9.4	$ 9.9
Long term: Operating lease liabilities	26	22.4
Total operating lease liabilities	35.4	32.3
Less: Rent incentives and deferrals	(2.1)	(2.5)
Assets
Operating lease assets	$ 33.3	$ 29.8
Lease Term and Discount Rate
Weighted-average remaining lease term	7 years 1 month 6 days
Weighted-average discount rate	4.10%

Leases - Components of Lease Ex

Leases - Components of Lease Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Lessee, Lease, Description [Line Items]
Short-term lease expenses	$ 1.2	$ 0.5	$ 3.4	$ 1.6
Variable lease expenses	1	0.8	3.4	2.5
Cost of products sold
Lessee, Lease, Description [Line Items]
Operating lease expense	1.5	0.7	4.1	2.7
Selling, general and administrative expenses
Lessee, Lease, Description [Line Items]
Operating lease expense	$ 3.9	$ 4.1	$ 12.3	$ 12.4

Leases - Maturities of Lease Li

Leases - Maturities of Lease Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Leases [Abstract]
2023	$ 2.9
2024	9.8
2025	7.2
2026	5.2
2027	3.5
After 2027	13.2
Total lease payments	41.8
Less: Imputed interest	(6.4)
Present value of operating lease liabilities	$ 35.4	$ 32.3

Inventories (Details)

Inventories (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Inventory Disclosure [Abstract]
Finished products	$ 187	$ 174.4
Work in process	47	42.1
Raw materials	334	349.2
Inventories, at FIFO cost	568	565.7
LIFO reserve	(49)	(49.3)
Inventories	$ 519	$ 516.4

Product Warranties (Details)

Product Warranties (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Product Warranties (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]
Balance at beginning of year	$ 180.7	$ 180	$ 182.5	$ 184.4
Expense	18.6	14	55.3	42.6
Claims settled	(17.6)	(16.8)	(56.1)	(49.8)
Balance at end of year	$ 181.7	$ 177.2	$ 181.7	$ 177.2

Debt (Details)

Debt (Details) $ in Millions	Dec. 31, 2021 USD ($) covenant
Debt Disclosure [Abstract]
Multi-currency revolving credit agreement, maximum borrowing capacity	$ 500
Accordion feature, higher borrowing capacity option	$ 850
Number of required financial covenants \| covenant	2

Earnings per Share of Common _3

Earnings per Share of Common Stock (Details) - shares	3 Months Ended		9 Months Ended
Earnings per Share of Common Stock (Details) - shares	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Denominator for basic earnings per share - weighted average shares (in shares)	150,103,113	154,197,072	150,488,897	155,625,624
Effect of dilutive stock options and share units (in shares)	1,106,861	877,790	1,058,910	1,037,520
Denominator for diluted earnings per share (in shares)	151,209,974	155,074,862	151,547,807	156,663,144

Stock Based Compensation - Narr

Stock Based Compensation - Narrative (Details) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($) shares	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) $ / shares shares	Sep. 30, 2022 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 1.5	$ 1.4	$ 10.1	$ 10.4
Weighted-average fair value per option at the date of grant (in USD per share) \| $ / shares				$ 17.57
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	0.3	0.5	$ 0.9	$ 5
Award vesting period				3 years
Award expiration period				10 years
Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			3 years
Number of units granted (in shares) \| shares			168,688	94,604
Value of units share units granted			$ 11.3	$ 6.9
Share based compensation expense attributable to share units	1.1	$ 1	$ 8.7	$ 5.5
Price on date of grant (in dollars per share) \| $ / shares			$ 67.18
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 0.2		$ 0.5
Award vesting period			3 years
Number of units granted (in shares) \| shares			24,580
Value of units share units granted			$ 1.7
Price on date of grant (in dollars per share) \| $ / shares			$ 67.14
Performance Shares \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Potential payouts range	0		0
Performance Shares \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Potential payouts range	1.50		1.50
A.O. Smith Combined Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for granting of options or share units (in shares) \| shares	2,475,242		2,475,242

Stock Based Compensation - Chan

Stock Based Compensation - Changes in Options (Details) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($) $ / shares shares
Weighted- Avg. Per Share Exercise Price
Beginning balance (in USD per share) \| $ / shares	$ 51.22
Exercised (in USD per share) \| $ / shares	43.12
Forfeited (in USD per share) \| $ / shares	65.03
Ending balance (in USD per share) \| $ / shares	$ 52.54
Number of Options
Beginning balance (in shares) \| shares	2,481,606
Exercised (in shares) \| shares	(356,007)
Forfeited (in shares) \| shares	(6,471)
Ending balance (in shares) \| shares	2,119,128
Stock option activity, additional disclosures
Outstanding, Average Remaining Contractual Life	7 years
Outstanding, Aggregate Intrinsic Value \| $	$ 31.3
Exercisable, Weighted-Avg. Per Share Exercise Price (in USD per share) \| $ / shares	$ 49.52
Exercisable, Number of Options (in shares) \| shares	1,795,586
Exercisable, Average Remaining Contractual Life	6 years
Exercisable, Aggregate Intrinsic Value \| $	$ 30.7

Stock Based Compensation - Sche

Stock Based Compensation - Schedule of Weighted-average Fair Value per Option at Date of Grant (Details) - Employee Stock Option	9 Months Ended
	Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life (years)	5 years 8 months 12 days
Risk-free interest rate	1.90%
Dividend yield	1.50%
Expected volatility	26.80%

Stock Based Compensation - Summ

Stock Based Compensation - Summary of Share Unit Activity Under Plan (Details) - Share Units - $ / shares	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Number of Units
Beginning balance (in shares)	379,919
Granted (in shares)	168,688	94,604
Vested (in shares)	(159,028)
Forfeited (in shares)	(5,684)
Ending balance (in shares)	383,895
Weighted-Average Grant Date Value
Beginning balance (in USD per share)	$ 52.92
Granted (in USD per share)	67.18
Vested (in USD per share)	49.41
Forfeited (in USD per share)	66.26
Ending balance (in USD per share)	$ 63.29

Stock Based Compensation - Sc_2

Stock Based Compensation - Schedule of Performance Stock Unit Activity (Details) - Performance Shares	9 Months Ended
	Sep. 30, 2023 $ / shares shares
Number of Units
Beginning balance (in shares) \| shares	0
Granted (in shares) \| shares	24,580
Forfeited (in shares) \| shares	(557)
Performance adjustments (in shares) \| shares	12,285
Ending balance (in shares) \| shares	36,308
Weighted-Average Grant Date Value
Beginning balance (in USD per share) \| $ / shares	$ 0
Granted (in USD per share) \| $ / shares	67.14
Forfeited (in USD per share) \| $ / shares	67.14
Performance adjustments (in USD per share) \| $ / shares	67.14
Ending balance (in USD per share) \| $ / shares	$ 67.14

Pensions - Components of Net Pe

Pensions - Components of Net Pension Income (Details) - Pension Plan - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0.2	$ 0.4	$ 0.7	$ 1.1
Interest cost	0.3	3.6	0.9	10.9
Expected return on plan assets	(0.3)	(5.4)	(0.9)	(16.1)
Amortization of unrecognized loss	0	5.1	0.1	15.3
Amortization of prior service cost	0	(0.1)	0.1	(0.3)
Defined benefit plan expense before settlement income	0.2	3.6	0.9	10.9
Settlement income	0	0	(6)	0
Total pension (income) expense	$ 0.2	$ 3.6	$ (5.1)	$ 10.9

Pensions - Narrative (Details)

Pensions - Narrative (Details) - USD ($)	3 Months Ended	9 Months Ended		12 Months Ended
Pensions - Narrative (Details) - USD ($)	Jun. 30, 2023	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Percentage of the pension plan liability (over)					95%
Pension settlement income	$ 6,000,000	$ 6,000,000	$ 0
Income tax benefit on defined benefit plan pension settlement income	1,500,000	1,500,000	$ 0
Pension assets		27,400,000
Corporate
Defined Benefit Plan Disclosure [Line Items]
Pension settlement income	1,000,000
North America
Defined Benefit Plan Disclosure [Line Items]
Pension settlement income	$ 5,000,000
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Employer contributions				$ 0
Expected current year employer contributions		$ 0

Segment Results (Details)

Segment Results (Details) $ in Millions	3 Months Ended		9 Months Ended
Segment Results (Details) $ in Millions	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) segment	Sep. 30, 2022 USD ($)
Segment Reporting [Abstract]
Number of reporting segments \| segment			2
Segment Reporting Information [Line Items]
Net sales	$ 937.5	$ 874.2	$ 2,864.7	$ 2,817.8
Segment earnings	193.2	163.6	614.5	518.1
Corporate expense	(2.5)	(2.4)	10.5	(6.4)
Interest expense	(2.4)	(2.4)	(10.9)	(6)
Earnings before income taxes	176.4	144.7	556.6	466.6
Provision for income taxes	41	34.9	137.3	110.8
Net Earnings	135.4	109.8	419.3	355.8
Impairment expense	0	0	15.6	0
Pension Plan
Segment Reporting Information [Line Items]
Settlement income	0	0	(6)	0
Pension expense	0.2	3.6	0.9	10.9
Inter-segment
Segment Reporting Information [Line Items]
Net sales	(5.8)	(8.9)	(16.9)	(25.4)
Segment earnings	0	0	0	(0.1)
Corporate
Segment Reporting Information [Line Items]
Corporate expense	(14.4)	(16.5)	(47)	(45.5)
Impairment expense	0	0	3.1	0
Corporate \| Terminated Acquisition
Segment Reporting Information [Line Items]
Expenses associated with terminated acquisition	0	4.3	0	4.3
Corporate \| Pension Plan
Segment Reporting Information [Line Items]
Settlement income	0	0	(1)	0
Pension expense	0	0.4	0	1.1
North America \| Operating Segments
Segment Reporting Information [Line Items]
Net sales	709.9	652.9	2,184.9	2,127.1
Segment earnings	170	141.8	557.7	453.5
Legal judgement income	0	(11.5)	0	(11.5)
North America \| Operating Segments \| Pension Plan
Segment Reporting Information [Line Items]
Settlement income	0	0	(5)	0
Pension expense	0	2.6	0	7.8
Rest of World \| Operating Segments
Segment Reporting Information [Line Items]
Net sales	233.4	230.2	696.7	716.1
Segment earnings	23.2	21.8	56.8	64.7
Impairment expense	$ 0	$ 0	$ 12.5	$ 0

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Quoted prices in active markets for identical assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets (liabilities) measured at fair value	$ 60.8	$ 90.6
Significant other observable inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets (liabilities) measured at fair value	$ 4.7	$ 6.5

Derivative Instruments - Schedu

Derivative Instruments - Schedule of Summary by Currency of Foreign Currency Forward Contracts (Details) - Foreign currency forward contracts - Designated as hedging instrument - Cash flow hedging - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Buy
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	$ 29.2	$ 45.9
Buy \| British pound
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	0	0
Buy \| Canadian dollar
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	0	0
Buy \| Euro
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	16.9	30.2
Buy \| Mexican peso
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	12.3	15.7
Sell
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	73.8	76.8
Sell \| British pound
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	0.4	0
Sell \| Canadian dollar
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	73.4	76.8
Sell \| Euro
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	0	0
Sell \| Mexican peso
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total	$ 0	$ 0

Derivative Instruments - Narrat

Derivative Instruments - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Trading Activity, Gains and Losses, Net [Line Items]
After-tax gains (losses) associated with currency translation adjustment in other comprehensive income	$ (6.9)	$ (28.9)	$ (5.4)	$ (52.9)
Designated as hedging instrument \| Foreign currency contracts \| Other current assets
Trading Activity, Gains and Losses, Net [Line Items]
Fair value of derivative instruments, assets	4.2		4.2		$ 6.4
Not Designated as Hedging Instrument \| Foreign currency contracts \| Other current assets
Trading Activity, Gains and Losses, Net [Line Items]
Fair value of derivative instruments, assets	0.5		0.5		$ 0.1
Net Investment Hedges \| Non-U.S. \| Designated as hedging instrument \| Foreign currency forward contracts
Trading Activity, Gains and Losses, Net [Line Items]
After-tax gains (losses) associated with currency translation adjustment in other comprehensive income	(0.2)	$ 0	1.1	$ 1.4
Contractual amounts	$ 204		$ 204

Derivative Instruments - Impact

Derivative Instruments - Impact of Derivative Contracts on Company's Financial Statements (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Designated as hedging instrument \| Foreign currency contracts \| Other current assets
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, assets	$ 4.2	$ 6.4

Derivative Instruments - Sche_2

Derivative Instruments - Schedule of Effect of Cash Flow Hedges on Consolidated Statement of Earnings (Details) - Foreign currency contracts - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Derivative [Line Items]
Amount of gain recognized in other comprehensive loss on derivatives	$ 1.4	$ 5.7	$ 3.6	$ 8.5
Cost of products sold
Derivative [Line Items]
Amount of gain reclassified from accumulated other comprehensive loss into earnings	$ 2.5	$ 1	$ 6.7	$ 1.8

Derivative Instruments - Summar

Derivative Instruments - Summary of Contractual Amounts for Balance Sheet Hedges (Details) - Foreign currency contracts - Fair Value Hedging - Designated as hedging instrument - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Canadian dollar \| Buy
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Contractual amounts	$ 0	$ 0
Canadian dollar \| Sell
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Contractual amounts	45.5	81.5
Chinese yuan \| Buy
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Contractual amounts	200.6	0
Chinese yuan \| Sell
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Contractual amounts	$ 0	$ 0

Derivative Instruments - Effect

Derivative Instruments - Effect of Foreign Exchange Contracts on the Statement of Earnings (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Foreign currency contracts \| Other expense (income) - net
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative (income) expense	$ 1.1	$ 0.4	$ 1.1	$ 1.5

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
Income Taxes (Details) - USD ($) $ in Millions	Sep. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2023
Income Tax Contingency [Line Items]
Effective tax rate	23.20%		24.10%	24.70%	23.70%
Impairment expense	$ 0		$ 0	$ 15.6	$ 0
Unrecognized tax benefits	15			15
Unrecognized tax benefits that would affect the effective tax rate, if recognized	$ 2.9			2.9
Disposal Group, Held-for-sale, Not Discontinued Operations
Income Tax Contingency [Line Items]
Impairment expense		$ 15.6		$ 15.6
Forecast \| Maximum
Income Tax Contingency [Line Items]
Effective tax rate						24%

Commitment and Contingencies (D

Commitment and Contingencies (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Commitments and Contingencies [Line Items]
Distributor rebate accruals	$ 1	$ 1.1
Repurchase of inventory
Commitments and Contingencies [Line Items]
Other commitment	$ 1.7	$ 2.4

Changes in Accumulated Other _3

Changes in Accumulated Other Comprehensive Loss by Component (Details) - USD ($) $ in Millions	2 Months Ended	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at the beginning of period				$ 1,747.7
Balance at end of period		$ 1,882.4	$ 1,747.8	1,882.4	$ 1,747.8
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at end of period		(90.1)	(368.1)	(90.1)	(368.1)
Accumulated Other Comprehensive Loss \| Disposal Group, Disposed of by Sale, Not Discontinued Operations
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Foreign currency translation losses released from accumulated other comprehensive loss	$ 11			11
Cumulative foreign currency translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at the beginning of period		(82.6)	(68.7)	(84.1)	(44.7)
Other comprehensive gain (loss) before reclassifications		(6.9)	(28.9)	(5.4)	(52.9)
Balance at end of period	(82.6)	(89.5)	(97.6)	(89.5)	(97.6)
Unrealized net gain on cash flow derivatives
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at the beginning of period		3.3	2.1	4.9	0.6
Other comprehensive gain (loss) before reclassifications		1.1	4.3	2.7	6.4
Reclassifications, net of tax		(1.9)	(0.8)	(5.1)	(1.4)
Balance at end of period	3.3	2.5	5.6	2.5	5.6
Income tax provision (benefit)		0.6	0.2	1.6	0.4
Pension liability
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at the beginning of period		(3.1)	(279.8)	(3.2)	(287.3)
Reclassifications, net of tax		0	3.7	0.1	11.2
Balance at end of period	$ (3.1)	(3.1)	(276.1)	(3.1)	(276.1)
Reclassification, before income tax benefit		0	5	0.2	15
Income tax provision (benefit)		0	(1.3)	(0.1)	(3.8)
Actuarial losses
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassification, before income tax benefit		0	5.1	0.1	15.3
Prior year service cost
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassification, before income tax benefit		$ 0	$ (0.1)	$ 0.1	$ (0.3)