Olin (OLN) 10-Q27 Oct 232023 Q3 Quarterly reportFinancial data

Company Profile

Document And Entity Information

Document And Entity Information	9 Months Ended
Document And Entity Information	Sep. 30, 2023 shares
Cover [Abstract]
Entity Registrant Name	Olin Corporation
Entity Central Index Key	0000074303
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2023
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
Document Transition Report	false
Entity File Number	1-1070
Entity Incorporation, State or Country Code	VA
Entity Tax Identification Number	13-1872319
Entity Address, Address Line One	190 Carondelet Plaza,
Entity Address, Address Line Two	Suite 1530,
Entity Address, City or Town	Clayton,
Entity Address, State or Province	MO
Entity Address, Postal Zip Code	63105
City Area Code	314
Local Phone Number	480-1400
Title of 12(b) Security	Common Stock, $1.00 par value per share
Trading Symbol	OLN
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
Entity Common Stock, Shares Outstanding	122,549,597

Condensed Balance Sheets

Condensed Balance Sheets - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Current assets:
Cash and cash equivalents	$ 158.3	$ 194	$ 163.6
Receivables, net	894.2	924.6	1,075.4
Income taxes receivable	28	43.2	26
Inventories, net	977.7	941.9	945.1
Other current assets	42.8	52.7	74.9
Total current assets	2,101	2,156.4	2,285
Property, plant and equipment (less accumulated depreciation of $4,724.6, $4,413.1 and $4,296.5)	2,490.2	2,674.1	2,690.8
Operating lease assets, net	331	356	371.4
Deferred income taxes	106.1	60.5	81.9
Other assets	1,117.3	1,102.5	1,090.7
Intangible assets, net	248.6	273.8	279.2
Goodwill	1,421	1,420.9	1,421.2
Total assets	7,815.2	8,044.2	8,220.2
Current liabilities:
Current installments of long-term debt	78.9	9.7	1
Accounts payable	717.6	837.7	892.6
Income taxes payable	171.5	133.4	183.2
Current operating lease liabilities	68.3	71.8	74.3
Accrued liabilities	361	508.8	467.6
Total current liabilities	1,397.3	1,561.4	1,618.7
Long-term debt	2,711.2	2,571	2,580.4
Operating lease liabilities	270.4	292.5	305.1
Accrued pension liability	212.7	234.5	286.3
Deferred income taxes	500.7	507.3	546.8
Other liabilities	355.4	333.9	333.2
Total liabilities	5,447.7	5,500.6	5,670.5
Commitments and contingencies
Shareholders’ equity:
Common stock, $1.00 par value per share: authorized, 240.0 shares; issued and outstanding, 122.5, 132.3 and 137.0 shares	122.5	132.3	137
Additional paid-in capital	130.1	682.7	920.3
Accumulated Other Comprehensive Income (Loss), Net of Tax, Total	(480.3)	(495.9)	(562.3)
Retained earnings	2,555.2	2,224.5	2,054.7
Olin Corporation’s shareholders’ equity	2,327.5	2,543.6	2,549.7
Stockholders' Equity Attributable to Noncontrolling Interest, Total	40	0	0
Total equity	2,367.5	2,543.6	2,549.7
Total liabilities and equity	$ 7,815.2	$ 8,044.2	$ 8,220.2

Condensed Balance Sheets Parent

Condensed Balance Sheets Parenthetical - USD ($) shares in Millions, $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Assets
Accumulated depreciation	$ 4,724.6	$ 4,413.1	$ 4,296.5
Shareholders' equity:
Common stock, par value	$ 1	$ 1	$ 1
Common stock, authorized (in shares)	240	240	240
Common stock, issued	122.5	132.3	137
Common stock, outstanding	122.5	132.3	137

Condensed Statements of Operati

Condensed Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Sales	$ 1,671.4	$ 2,321.7	$ 5,218.4	$ 7,399.2
Operating expenses:
Cost of goods sold	1,402.3	1,840.9	4,236.6	5,599.8
Selling and administration	90.9	92.7	303.9	296
Restructuring charges	11.9	7.6	92	14.3
Other operating (expense) income	(0.3)	13	27.2	16.3
Operating income	166	393.5	613.1	1,505.4
Interest expense	46.2	36	133.9	103.4
Interest income	1	0.5	3.2	1.2
Non-operating pension income	5.9	9.9	17	29
Income before taxes	126.7	367.9	499.4	1,432.2
Income tax provision	22.2	52.7	96.2	301.9
Net income	104.5	315.2	403.2	1,130.3
Net income (loss) attributable to noncontrolling interests	0.4	0	(4.1)	0
Net income attributable to Olin Corporation	$ 104.1	$ 315.2	$ 407.3	$ 1,130.3
Net income attributable to Olin Corporation per common share:
Basic	$ 0.84	$ 2.23	$ 3.19	$ 7.62
Diluted	$ 0.82	$ 2.18	$ 3.12	$ 7.44
Average common shares outstanding:
Basic	124.2	141.2	127.5	148.3
Diluted	127	144.3	130.6	151.9

Condensed Statements of Compreh

Condensed Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net income	$ 104.5	$ 315.2	$ 403.2	$ 1,130.3
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(3.3)	(25.1)	(6.3)	(61.6)
Gains (losses) on derivative contracts, net	6.2	(8.7)	21	(33)
Amortization of prior service costs and actuarial losses, net	0.2	7	0.9	20.3
Total other comprehensive income (loss), net of tax	3.1	(26.8)	15.6	(74.3)
Comprehensive income	107.6	288.4	418.8	1,056
Comprehensive income (loss) attributable to noncontrolling interests	0.4	0	(4.1)	0
Comprehensive income attributable to Olin Corporation	$ 107.2	$ 288.4	$ 422.9	$ 1,056

Condensed Statements of Shareho

Condensed Statements of Shareholders' Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Noncontrolling Interest
Balance at beginning of period at Dec. 31, 2021		$ 156.8	$ 1,969.6	$ (488)	$ 1,013.8
Common stock repurchased and retired	$ (1,100.6)	(20.8)	(1,079.8)
Stock Issued During Period, Value, Stock Options Exercised	21.3	0.9	20.4
Common stock issued for other transactions		0.1	3.1
Stock-based compensation			7
Other comprehensive income (loss)	(74.3)			(74.3)
Net income	1,130.3				1,130.3
Common stock dividends paid					(89.4)
Balance at end of period at Sep. 30, 2022	2,549.7	$ 137	920.3	(562.3)	2,054.7
Balance at beginning of period at Dec. 31, 2021						$ 0
Net income (loss) attributable to noncontrolling interests	0					0
Contributions received from noncontrolling interests	0					0
Balance at end of period at Sep. 30, 2022	0					0
Dividends declared per share of common stock		$ 0.60
Balance at beginning of period at Jun. 30, 2022		$ 145.1	1,318.5	(535.5)	1,768
Common stock repurchased and retired		(8.2)	(402.7)
Stock Issued During Period, Value, Stock Options Exercised		0	0.4
Common stock issued for other transactions		0.1	0.1
Stock-based compensation			4
Other comprehensive income (loss)	(26.8)			(26.8)
Net income	315.2				315.2
Common stock dividends paid					(28.5)
Balance at end of period at Sep. 30, 2022	2,549.7	$ 137	920.3	(562.3)	2,054.7
Balance at beginning of period at Jun. 30, 2022						0
Net income (loss) attributable to noncontrolling interests	0					0
Contributions received from noncontrolling interests						0
Balance at end of period at Sep. 30, 2022	0					0
Dividends declared per share of common stock		$ 0.20
Total equity	2,549.7
Total equity	2,543.6
Balance at beginning of period at Dec. 31, 2022	2,543.6	$ 132.3	682.7	(495.9)	2,224.5
Common stock repurchased and retired	(595.1)	(10.8)	(584.3)
Stock Issued During Period, Value, Stock Options Exercised	22.3	0.8	21.5
Common stock issued for other transactions		0.2	1.6
Stock-based compensation			8.6
Other comprehensive income (loss)	15.6			15.6
Net income	403.2				407.3
Common stock dividends paid					(76.6)
Balance at end of period at Sep. 30, 2023	2,327.5	$ 122.5	130.1	(480.3)	2,555.2
Balance at beginning of period at Dec. 31, 2022	0					0
Net income (loss) attributable to noncontrolling interests	(4.1)					(4.1)
Contributions received from noncontrolling interests	44.1					44.1
Balance at end of period at Sep. 30, 2023	40					40
Dividends declared per share of common stock		$ 0.60
Balance at beginning of period at Jun. 30, 2023		$ 125.8	313.7	(483.4)	2,475.9
Common stock repurchased and retired		(3.7)	(198.3)
Stock Issued During Period, Value, Stock Options Exercised		0.4	9.9
Common stock issued for other transactions		0	0.1
Stock-based compensation			4.7
Other comprehensive income (loss)	3.1			3.1
Net income	104.5				104.1
Common stock dividends paid					(24.8)
Balance at end of period at Sep. 30, 2023	2,327.5	$ 122.5	$ 130.1	$ (480.3)	$ 2,555.2
Balance at beginning of period at Jun. 30, 2023						39.6
Net income (loss) attributable to noncontrolling interests	0.4					0.4
Contributions received from noncontrolling interests						0
Balance at end of period at Sep. 30, 2023	40					$ 40
Dividends declared per share of common stock		$ 0.20
Total equity	$ 2,367.5

Condensed Statements of Cash Fl

Condensed Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
Condensed Statements of Cash Flows - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Operating Activities
Net income	$ 403.2	$ 1,130.3
Gains on disposition of property, plant and equipment	(27)	(13)
Adjustments to reconcile net income to net cash and cash equivalents provided by (used for) operating activities:
Stock-based compensation	13.2	10.4
Depreciation and amortization	404.9	450.3
Deferred income taxes	(60.6)	(3.7)
Write-off of equipment and facility included in restructuring charges	17.7	0
Qualified pension plan contributions	(1.6)	(0.9)
Qualified pension plan income	(15)	(24.7)
Change in:
Receivables	28.4	(25.8)
Income taxes receivable/payable	55.3	75.5
Inventories	(43.4)	(102.9)
Other current assets	9.8	5.8
Accounts payable and accrued liabilities	(222.7)	31.7
Other assets	(27.2)	(17.5)
Other noncurrent liabilities	29.5	(9.1)
Other operating activities	(6.8)	3.3
Net operating activities	557.7	1,509.7
Investing Activities
Capital expenditures	(173)	(168.4)
Payments under other long-term supply contracts	(46.2)	0
Proceeds from disposition of property, plant and equipment	28.8	14.9
Other investing activities	(3.6)	0
Net investing activities	(194)	(153.5)
Long-term debt:
Borrowings	587.7	215
Repayments	(381.1)	(415.9)
Common stock repurchased and retired	(595.1)	(1,100.6)
Stock options exercised	22.3	21.3
Dividends paid	(76.6)	(89.4)
Contributions received from noncontrolling interests	44.1	0
Net financing activities	(398.7)	(1,369.6)
Effect of exchange rate changes on cash and cash equivalents	(0.7)	(3.5)
Net decrease in cash and cash equivalents	(35.7)	(16.9)
Cash and cash equivalents, beginning of year	194	180.5
Cash and cash equivalents, end of period	158.3	163.6
Cash paid for interest and income taxes:
Interest, net	148.9	122.1
Income taxes, net of refunds	81.9	213
Non-cash investing activities:
Decrease in capital expenditures included in accounts payable and accrued liabilities	$ 17.9	$ 12

DESCRIPTION OF BUSINESS

DESCRIPTION OF BUSINESS	9 Months Ended
DESCRIPTION OF BUSINESS	Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
DESCRIPTION OF BUSINESS	NOTE 1. DESCRIPTION OF BUSINESS Olin Corporation (Olin) is a Virginia corporation, incorporated in 1892, having its principal executive offices in Clayton, MO. We are a leading vertically-integrated global manufacturer and distributor of chemical products and a leading U.S. manufacturer of ammunition. Our operations are concentrated in three business segments: Chlor Alkali Products and Vinyls, Epoxy and Winchester. All of our business segments are capital intensive manufacturing businesses. The Chlor Alkali Products and Vinyls segment manufactures and sells chlorine and caustic soda, ethylene dichloride and vinyl chloride monomer, methyl chloride, methylene chloride, chloroform, carbon tetrachloride, perchloroethylene, hydrochloric acid, hydrogen, bleach products and potassium hydroxide. The Epoxy segment produces and sells a full range of epoxy materials and precursors, including aromatics (acetone and phenol), allyl chloride, epichlorohydrin, liquid epoxy resins, solid epoxy resins and systems and growth products such as converted epoxy resins and additives. The Winchester segment produces and sells sporting ammunition, reloading components, small caliber military ammunition and components, industrial cartridges and clay targets. On January 10, 2023, Blue Water Alliance (BWA), our joint venture with Mitsui & Co., Ltd. (Mitsui), began operations after receiving all necessary regulatory approvals. BWA is an independent global trader of ECU-based derivatives, focused on globally traded caustic soda and ethylene dichloride. Olin holds 51% interest and exercises control in BWA and the joint venture is consolidated in our consolidated financial statements with Mitsui’s 49% interest in BWA classified as noncontrolling interest. All intercompany accounts and transactions are eliminated in consolidation.

RECENT ACCOUNTING PRONOUNCEMENT

RECENT ACCOUNTING PRONOUNCEMENTS	9 Months Ended
RECENT ACCOUNTING PRONOUNCEMENTS	Sep. 30, 2023
Accounting Standards Update and Change in Accounting Principle [Abstract]
RECENT ACCOUNTING PRONOUNCEMENTS	NOTE 2. RECENT ACCOUNTING PRONOUNCEMENTS We do not believe that any recently issued effective pronouncements, or pronouncements issued but not yet effective, if adopted, would have a material effect on the accompanying condensed financial statements.

RESTRUCTURING CHARGES

RESTRUCTURING CHARGES	9 Months Ended
RESTRUCTURING CHARGES	Sep. 30, 2023
Restructuring and Related Activities [Abstract]
RESTRUCTURING CHARGES	NOTE 3. RESTRUCTURING CHARGES As a result of weak global resin demand and higher cost structures within the European region, we began a review of our global Epoxy asset footprint to optimize the most productive and cost effective assets to support our strategic operating model. As part of this review we announced operational cessations in the fourth quarter of 2022 and the first and second quarters of 2023 (collectively, Epoxy Optimization Plan). The foregoing actions will complete the rightsizing plan of our Epoxy business. On June 20, 2023, we announced we had made the decision to cease all remaining operations at our Gumi, South Korea facility, reduce epoxy resin capacity at our Freeport, TX facility, and reduce our sales and support staffing across Asia. These actions are expected to be substantially completed by December 31, 2023. On March 21, 2023, we announced we had made the decision to cease operations at our cumene facility in Terneuzen, Netherlands and solid epoxy resin production at our facilities in Gumi, South Korea and Guaruja, Brazil. The closures were completed in the first quarter 2023. During the fourth quarter of 2022, we committed to and completed a plan to close down one of our bisphenol production lines at our Stade, Germany site. For the three and nine months ended September 30, 2023, we recorded restructuring charges of $8.6 million and $79.7 million, respectively, for the write-off of equipment and facility costs, employee severance and related benefit costs, contract termination costs and facility exit costs related to these actions. We expect to incur additional restructuring charges through 2026 of approximately $45 million related to these actions. During 2021, we announced that we had made the decision to permanently close our diaphragm-grade chlor alkali capacity, representing 400,000 tons, at our McIntosh, AL facility (McIntosh Plan). The closure was completed during third quarter of 2022. For the three months ended September 30, 2023 and 2022, we recorded restructuring charges of $0.7 million and $5.5 million, respectively, for lease and other contract termination costs, facility exit costs, and for the write-off of equipment and facility costs related to this action. For the nine months ended September 30, 2023 and 2022, we recorded restructuring charges of $4.6 million and $7.1 million, respectively, for lease and other contract termination costs, facility exit costs, and for the write-off of equipment and facility costs related to this action. We expect to incur additional restructuring charges through 2027 of approximately $25 million related to these actions. On January 18, 2021, we announced we had made the decision to permanently close our trichloroethylene and anhydrous hydrogen chloride liquefaction facilities in Freeport, TX (collectively, Freeport 2021 Plan), which were completed in the fourth quarter of 2021. For the three months ended September 30, 2023 and 2022, we recorded restructuring charges of $0.7 million and $0.4 million, respectively, for facility exit costs related to these actions. For the nine months ended September 30, 2023 and 2022, we recorded restructuring charges of $2.8 million and $1.9 million, respectively, for facility exit costs related to these actions. We expect to incur additional restructuring charges through 2025 of approximately $15 million related to these actions. On December 11, 2019, we announced that we had made the decision to permanently close a chlor alkali plant with a capacity of 230,000 tons and our vinylidene chloride (VDC) production facility, both in Freeport, TX (collectively, Freeport 2019 Plan). The VDC facility and related chlor alkali plant were closed during the fourth quarter of 2020 and second quarter of 2021, respectively. For the three months ended September 30, 2023 and 2022, we recorded restructuring charges of $1.9 million and $1.7 million, respectively, for facility exit costs related to these actions. For the nine months ended September 30, 2023 and 2022, we recorded restructuring charges of $4.9 million and $4.9 million, respectively, for facility exit costs related to these actions. We expect to incur additional restructuring charges through 2026 of approximately $25 million related to these actions. On March 21, 2016, we announced that we had made the decision to close a combined total of 433,000 tons of chlor alkali capacity across three separate locations (collectively, Chlor Alkali 2016 Plan). For the nine months ended September 30, 2022, we recorded restructuring charges of $0.4 million, respectively, for facility exit costs and lease and other contract termination costs related to these actions. We do not expect to incur additional restructuring charges related to these capacity reductions. The following table summarizes the 2023 and 2022 activities by major component of these restructuring actions and the remaining balances of accrued restructuring costs as of September 30, 2023 and 2022: Employee severance and related benefit costs Lease and other contract termination costs Facility exit costs Write-off of equipment and facility Total ($ in millions) Balance at January 1, 2022 $ 6.9 $ 5.4 $ — $ — $ 12.3 Restructuring charges: First quarter — 0.1 2.6 0.4 3.1 Second quarter — 0.2 3.1 0.3 3.6 Third quarter — — 4.9 2.7 7.6 Amounts utilized (4.3) (1.3) (10.6) (3.4) (19.6) Balance at September 30, 2022 $ 2.6 $ 4.4 $ — $ — $ 7.0 Balance at January 1, 2023 $ 9.4 $ 4.2 $ — $ — $ 13.6 Restructuring charges: First quarter — 39.7 8.4 12.8 60.9 Second quarter 3.3 1.7 9.3 4.9 19.2 Third quarter 2.6 2.0 7.3 — 11.9 Amounts utilized (3.4) (13.4) (25.0) (17.7) (59.5) Balance at September 30, 2023 $ 11.9 $ 34.2 $ — $ — $ 46.1 The following table summarizes the cumulative restructuring charges of these restructuring actions by major component through September 30, 2023: Chlor Alkali Products and Vinyls Epoxy Corporate/other Total McIntosh Plan Freeport 2021 Plan Freeport 2019 Plan Chlor Alkali 2016 Plan Epoxy Optimization Plan Productivity Plan ($ in millions) Write-off of equipment and facility $ 2.7 $ — $ 58.9 $ 78.1 $ 18.3 $ — $ 158.0 Employee severance and related benefit costs — — 2.1 6.7 13.3 10.3 32.4 Facility exit costs 9.4 11.9 16.5 53.2 12.7 — 103.7 Employee relocation costs — — — 1.7 — — 1.7 Lease and other contract termination costs 6.4 — — 43.0 43.4 — 92.8 Total cumulative restructuring charges $ 18.5 $ 11.9 $ 77.5 $ 182.7 $ 87.7 $ 10.3 $ 388.6 As of September 30, 2023, we have incurred cash expenditures of $184.5 million and non-cash charges of $158.0 million related to these restructuring actions. The remaining balance of $46.1 million is expected to be paid out through 2028.

EARNINGS PER SHARE

EARNINGS PER SHARE	9 Months Ended
EARNINGS PER SHARE	Sep. 30, 2023
Earnings Per Share [Abstract]
EARNINGS PER SHARE	NOTE 4. EARNINGS PER SHARE Basic and diluted net income attributable to Olin Corporation per share are computed by dividing net income attributable to Olin Corporation by the weighted-average number of common shares outstanding. Diluted net income attributable to Olin Corporation per share reflects the dilutive effect of stock-based compensation. Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Computation of Net Income per Share (In millions, except per share data) Net income $ 104.5 $ 315.2 $ 403.2 $ 1,130.3 Net income (loss) attributable to noncontrolling interests 0.4 — (4.1) — Net income attributable to Olin Corporation $ 104.1 $ 315.2 $ 407.3 $ 1,130.3 Basic shares 124.2 141.2 127.5 148.3 Basic net income attributable to Olin Corporation per share $ 0.84 $ 2.23 $ 3.19 $ 7.62 Diluted shares: Basic shares 124.2 141.2 127.5 148.3 Stock-based compensation 2.8 3.1 3.1 3.6 Diluted shares 127.0 144.3 130.6 151.9 Diluted net income attributable to Olin Corporation per share $ 0.82 $ 2.18 $ 3.12 $ 7.44 The computation of dilutive shares does not include 1.3 million shares for both the three and nine months ended September 30, 2023 and 0.7 million shares for both the three and nine months ended September 30, 2022, as their effect would have been anti-dilutive.

ACCOUNTS RECEIVABLES

ACCOUNTS RECEIVABLES	9 Months Ended
ACCOUNTS RECEIVABLES	Sep. 30, 2023
Receivables [Abstract]
ACCOUNTS RECEIVABLE	NOTE 5. ACCOUNTS RECEIVABLES We maintain a $425.0 million Receivables Financing Agreement (Receivables Financing Agreement) that is scheduled to mature on October 14, 2025. Under the Receivables Financing Agreement, our eligible trade receivables are used for collateralized borrowings and continue to be serviced by us. In addition, the Receivables Financing Agreement incorporates the net leverage ratio covenant that is contained in the $1,550.0 million Senior Credit Facility. As of September 30, 2023, December 31, 2022 and September 30, 2022, we had $350.0 million, $300.0 million and $300.0 million, respectively, drawn under the agreement. As of September 30, 2023, $489.4 million of our trade receivables were pledged as collateral and we had $7.2 million of additional borrowing capacity under the Receivables Financing Agreement, which was limited by our borrowing base. Olin also has trade accounts receivable factoring arrangements (AR Facilities) and pursuant to the terms of the AR Facilities, certain of our domestic subsidiaries may sell their accounts receivable up to a maximum of $175.5 million and certain of our foreign subsidiaries may sell their accounts receivable up to a maximum of €22.0 million. We will continue to service the outstanding accounts sold. These receivables qualify for sales treatment under ASC 860 “Transfers and Servicing” and, accordingly, the proceeds are included in net cash provided by operating activities in the condensed statements of cash flows. The following table summarizes the AR Facilities activity: September 30, 2023 2022 ($ in millions) Balance at beginning of year $ 111.8 $ 83.3 Gross receivables sold 749.5 769.3 Payments received from customers on sold accounts (788.6) (761.3) Balance at end of period $ 72.7 $ 91.3 The factoring discount paid under the AR Facilities is recorded as interest expense on the condensed statements of operations. The factoring discount was $1.3 million and $0.9 million for the three months ended September 30, 2023 and 2022, respectively, and $3.8 million and $1.8 million for the nine months ended September 30, 2023 and 2022, respectively. The agreements are without recourse and therefore no recourse liability had been recorded as of September 30, 2023, December 31, 2022 or September 30, 2022. Our condensed balance sheets included an allowance for doubtful accounts receivables of $12.8 million, $12.6 million and $12.5 million and other receivables of $78.0 million, $71.6 million and $58.0 million at September 30, 2023, December 31, 2022 and September 30, 2022, respectively, which were included in receivables, net.

INVENTORIES

INVENTORIES	9 Months Ended
INVENTORIES	Sep. 30, 2023
Inventory Disclosure [Abstract]
INVENTORIES	NOTE 6. INVENTORIES Inventories consisted of the following: September 30, 2023 December 31, September 30, 2022 ($ in millions) Supplies $ 150.3 $ 137.6 $ 137.2 Raw materials 178.3 201.2 203.4 Work in process 188.4 199.6 189.6 Finished goods 615.5 559.3 569.2 Inventories excluding LIFO reserve 1,132.5 1,097.7 1,099.4 LIFO reserve (154.8) (155.8) (154.3) Inventories, net $ 977.7 $ 941.9 $ 945.1 Inventories under the LIFO method are based on annual estimates of quantities and costs as of year-end; therefore, the condensed financial statements at September 30, 2023 reflect certain estimates relating to inventory quantities and costs at December 31, 2023. The replacement cost of our inventories would have been approximately $154.8 million, $155.8 million and $154.3 million higher than reported at September 30, 2023, December 31, 2022 and September 30, 2022, respectively.

OTHER ASSETS

OTHER ASSETS	9 Months Ended
OTHER ASSETS	Sep. 30, 2023
Other Assets [Abstract]
OTHER ASSETS	NOTE 7. OTHER ASSETS Included in other assets were the following: September 30, 2023 December 31, 2022 September 30, 2022 ($ in millions) Supply contracts $ 1,060.6 $ 1,048.0 $ 1,013.8 Other 56.7 54.5 76.9 Other assets $ 1,117.3 $ 1,102.5 $ 1,090.7 Amortization expense of $17.8 million and $17.6 million for the three months ended September 30, 2023 and 2022, respectively, and amortization expense of $53.4 million and $52.8 million for the nine months ended September 30, 2023 and 2022, respectively, was recognized within cost of goods sold related to our long-term supply contracts and is reflected in depreciation and amortization on the condensed statements of cash flows.

GOODWILL AND INTANGIBLE ASSETS

GOODWILL AND INTANGIBLE ASSETS	9 Months Ended
GOODWILL AND INTANGIBLE ASSETS	Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND INTANGIBLES	NOTE 8. GOODWILL AND INTANGIBLE ASSETS Changes in the carrying value of goodwill were as follows: Chlor Alkali Products and Vinyls Epoxy Total ($ in millions) Balance at January 1, 2022 $ 1,275.6 $ 145.0 $ 1,420.6 Foreign currency translation adjustment 0.5 0.1 0.6 Balance at September 30, 2022 $ 1,276.1 $ 145.1 $ 1,421.2 Balance at January 1, 2023 $ 1,275.8 $ 145.1 $ 1,420.9 Foreign currency translation adjustment 0.1 — 0.1 Balance at September 30, 2023 $ 1,275.9 $ 145.1 $ 1,421.0 Intangible assets consisted of the following: September 30, 2023 December 31, 2022 September 30, 2022 Gross Amount Accumulated Amortization Net Gross Amount Accumulated Amortization Net Gross Amount Accumulated Amortization Net ($ in millions) Customers, customer contracts and relationships $ 668.0 $ (426.8) $ 241.2 $ 669.1 $ (401.2) $ 267.9 $ 662.0 $ (389.3) $ 272.7 Acquired technology 92.8 (89.4) 3.4 93.1 (88.3) 4.8 91.9 (86.5) 5.4 Other 4.7 (0.7) 4.0 1.8 (0.7) 1.1 1.8 (0.7) 1.1 Total intangible assets $ 765.5 $ (516.9) $ 248.6 $ 764.0 $ (490.2) $ 273.8 $ 755.7 $ (476.5) $ 279.2

DEBT

DEBT	9 Months Ended
DEBT	Sep. 30, 2023
Debt Disclosure [Abstract]
DEBT	NOTE 9. DEBT Long-term Debt Borrowings (Repayments) September 30, 2023 September 30, 2022 Debt Instruments ($ in millions) Borrowings: Senior Revolving Credit Facility 255.0 170.0 Receivables Financing Agreement 332.7 45.0 Total borrowings $ 587.7 $ 215.0 Repayments: 5.50% senior notes due 2022 — (200.0) Senior Term Loan (6.6) — Senior Revolving Credit Facility (90.0) (170.0) Receivables Financing Agreement (282.7) (45.0) Finance leases (1.8) (0.9) Total repayments $ (381.1) $ (415.9) Long-term debt borrowings (repayments), net $ 206.6 $ (200.9) Senior Credit Facility On October 11, 2022, we entered into a new $1,550.0 million senior credit facility (Senior Credit Facility) that replaced our previous senior credit facility (2021 Senior Credit Facility), which included outstanding term loans of $350.0 million and a senior revolving credit facility with aggregate commitments in an amount equal to $800.0 million. The Senior Credit Facility includes a senior term loan facility with aggregate commitments of $350.0 million (Term Loan Facility) and a senior revolving credit facility with aggregate commitments of $1,200.0 million (Senior Revolving Credit Facility). The Term Loan Facility was fully drawn on the closing date with the proceeds of the Term Loan Facility used to refinance the loans and commitments outstanding under the 2021 Senior Credit Facility. The Term Loan Facility requires principal amortization amounts payable beginning March 31, 2023 at a rate of 0.625% per quarter through the end of 2024, increasing to 1.250% per quarter thereafter until maturity. The maturity date for the Senior Credit Facility is October 11, 2027. The Senior Revolving Credit Facility includes a $100.0 million letter of credit subfacility. At September 30, 2023, we had $1,034.6 million available under our $1,200.0 million Senior Revolving Credit Facility because we had $165.0 million borrowed under the facility and issued $0.4 million of letters of credit. We were in compliance with all covenants and restrictions under all our outstanding credit agreements as of September 30, 2023, and no event of default had occurred that would permit the lenders under our outstanding credit agreements to accelerate the debt if not cured. In the future, our ability to generate sufficient operating cash flows, among other factors, will determine the amounts available to be borrowed under these facilities. As a result of our restrictive covenant related to the net leverage ratio, the maximum additional borrowings available to us could be limited in the future. The limitation, if an amendment or waiver from our lenders is not obtained, could restrict our ability to borrow the maximum amounts available under the Senior Revolving Credit Facility and the Receivables Financing Agreement. As of September 30, 2023, there were no covenants or other restrictions that limited our ability to borrow.

PENSION PLANS AND RETIREMENT BE

PENSION PLANS AND RETIREMENT BENEFITS	9 Months Ended
PENSION PLANS AND RETIREMENT BENEFITS	Sep. 30, 2023
Retirement Benefits [Abstract]
PENSION PLANS AND RETIREMENT BENEFITS	NOTE 10. PENSION PLANS AND RETIREMENT BENEFITS We sponsor domestic and foreign defined benefit pension plans for eligible employees and retirees. Most of our domestic employees participate in defined contribution plans. However, a portion of our bargaining hourly employees continue to participate in our domestic qualified defined benefit pension plans under a flat-benefit formula. Our funding policy for the qualified defined benefit pension plans is consistent with the requirements of federal laws and regulations. Our foreign subsidiaries maintain pension and other benefit plans, which are consistent with local statutory practices. Our domestic qualified defined benefit pension plan provides that if, within three years following a change of control of Olin, any corporate action is taken or filing made in contemplation of, among other things, a plan termination or merger or other transfer of assets or liabilities of the plan, and such termination, merger, or transfer thereafter takes place, plan benefits would automatically be increased for affected participants (and retired participants) to absorb any plan surplus (subject to applicable collective bargaining requirements). We also provide certain postretirement healthcare (medical) and life insurance benefits for eligible active and retired domestic employees. The healthcare plans are contributory with participants’ contributions adjusted annually based on medical rates of inflation and plan experience. Pension Benefits Other Postretirement Benefits Three Months Ended September 30, Three Months Ended September 30, 2023 2022 2023 2022 Components of Net Periodic Benefit (Income) Cost ($ in millions) Service cost $ 1.4 $ 2.0 $ 0.1 $ 0.2 Interest cost 26.4 15.1 0.4 0.2 Expected return on plans’ assets (32.9) (34.3) — — Amortization of prior service cost (0.1) — — — Recognized actuarial loss 0.3 9.0 — 0.1 Net periodic benefit (income) cost $ (4.9) $ (8.2) $ 0.5 $ 0.5 Pension Benefits Other Postretirement Benefits Nine Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Components of Net Periodic Benefit (Income) Cost ($ in millions) Service cost $ 4.2 $ 6.5 $ 0.5 $ 0.8 Interest cost 79.1 46.0 1.3 0.8 Expected return on plans’ assets (98.5) (102.8) — — Amortization of prior service cost (0.3) (0.4) 0.1 0.1 Recognized actuarial loss 0.9 26.2 0.4 1.1 Net periodic benefit (income) cost $ (14.6) $ (24.5) $ 2.3 $ 2.8 We made cash contributions to our international qualified defined benefit pension plans of $1.6 million and $0.9 million for the nine months ended September 30, 2023 and 2022, respectively.

INCOME TAXES

INCOME TAXES	9 Months Ended
INCOME TAXES	Sep. 30, 2023
Income Tax Disclosure [Abstract]
INCOME TAXES	NOTE 11. INCOME TAXES The effective tax rate for the three months ended September 30, 2023 included a net $7.2 million tax benefit, primarily associated with stock-based compensation and prior year tax positions, partially offset by an expense from a change in tax contingencies. After giving consideration to these items, the effective tax rate for the three months ended September 30, 2023 of 23.2% was higher than the 21.0% U.S. federal statutory rate primarily due to state income tax and an increase in the valuation allowance related to losses in foreign jurisdictions, partially offset by favorable permanent salt depletion deductions and foreign income taxes. The effective tax rate for the three months ended September 30, 2022 included a net $36.6 million benefit primarily associated with a legal entity liquidation. After giving consideration to this benefit, the effective tax rate for the three months ended September 30, 2022 of 24.3% was higher than the 21.0% U.S. federal statutory rate primarily due to state and foreign income taxes, partially offset by foreign income exclusions and favorable permanent salt depletion deductions. The effective tax rate for the nine months ended September 30, 2023 included a net $24.4 million tax benefit, primarily associated with stock-based compensation and prior year tax positions, partially offset by an expense from a change in tax contingencies. After giving consideration to these items, the effective tax rate for the nine months ended September 30, 2023 of 24.1% was higher than the 21.0% U.S. federal statutory rate primarily due to state income tax and an increase in the valuation allowance related to losses in foreign jurisdictions, partially offset by favorable permanent salt depletion deductions and foreign income taxes. The effective tax rate for the nine months ended September 30, 2022 included a net $47.5 million tax benefit primarily associated with a legal entity liquidation, prior year tax positions and stock-based compensation. After giving consideration to these items, the effective tax rate for the nine months ended September 30, 2022 of 24.4% was higher than the 21.0% U.S. federal statutory rate primarily due to state and foreign income taxes, partially offset by foreign income exclusions and favorable permanent salt depletion deductions. As of September 30, 2023, we had $62.1 million of gross unrecognized tax benefits, which would have a net $58.4 million impact on the effective tax rate, if recognized. As of September 30, 2022, we had $44.8 million of gross unrecognized tax benefits, of which $44.7 million would have impacted the effective tax rate, if recognized. The amounts of unrecognized tax benefits were as follows: September 30, 2023 2022 ($ in millions) Balance at beginning of year $ 51.6 $ 43.4 Increases for prior year tax positions 1.3 0.3 Decreases for prior year tax positions (0.3) (0.7) Increases for current year tax positions 10.1 5.9 Foreign currency translation adjustments (0.6) (4.1) Balance at end of period $ 62.1 $ 44.8 As of September 30, 2023, we believe it is reasonably possible that our total amount of unrecognized tax benefits will decrease by approximately $48.9 million over the next twelve months. The anticipated reduction primarily relates to settlements with taxing authorities and the expiration of federal, state and foreign statutes of limitation. We operate globally and file income tax returns in numerous jurisdictions. Our tax returns are subject to examination by various federal, state and local tax authorities. Additionally, examinations are ongoing in various states and foreign jurisdictions. We believe we have adequately provided for all tax positions; however, amounts asserted by taxing authorities could be greater than our accrued position. For our primary tax jurisdictions, the tax years that remain subject to examination are as follows: Tax Years U.S. federal income tax 2018 - 2022 U.S. state income tax 2012 - 2022 Canadian federal income tax 2016 - 2022 Brazil 2016 - 2022 Germany 2015 - 2022 China 2014 - 2022 The Netherlands 2016 - 2022

CONTRIBUTING EMPLOYEE OWNERSHIP

CONTRIBUTING EMPLOYEE OWNERSHIP PLAN	9 Months Ended
CONTRIBUTING EMPLOYEE OWNERSHIP PLAN	Sep. 30, 2023
Retirement Benefits [Abstract]
CONTRIBUTING EMPLOYEE OWNERSHIP PLAN	NOTE 12. CONTRIBUTING EMPLOYEE OWNERSHIP PLAN The Contributing Employee Ownership Plan (CEOP) is a defined contribution plan available to essentially all domestic employees. We provide a contribution to an individual retirement contribution account maintained with the CEOP equal to an amount of between 5.0% and 7.5% of the employee’s eligible compensation. The defined contribution plan expense for the three months ended September 30, 2023 and 2022 was $8.4 million and $9.6 million, respectively, and for the nine months ended September 30, 2023 and 2022 was $28.6 million and $28.9 million, respectively.

STOCK-BASED COMPENSATION

STOCK-BASED COMPENSATION	9 Months Ended
STOCK-BASED COMPENSATION	Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]
STOCK-BASED COMPENSATION	NOTE 13. STOCK-BASED COMPENSATION Stock-based compensation granted includes stock options, performance stock awards, restricted stock awards and deferred directors’ compensation. Stock-based compensation expense (benefit) was as follows: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 ($ in millions) Stock-based compensation $ 6.7 $ 5.8 $ 19.5 $ 20.0 Mark-to-market adjustments (2.3) (2.0) (2.4) (10.5) Total expense $ 4.4 $ 3.8 $ 17.1 $ 9.5 The fair value of each stock option granted, which typically vests ratably over three years, but not less than one year, was estimated on the date of grant, using the Black-Scholes option-pricing model with the following weighted-average assumptions: Grant date 2023 2022 Dividend yield 1.32 % 1.60 % Risk-free interest rate 4.07 % 1.93 % Expected volatility of Olin common stock 47 % 48 % Expected life (years) 7.0 7.0 Weighted-average grant fair value (per option) $ 28.74 $ 21.18 Weighted-average exercise price $ 60.55 $ 49.71 Options granted 562,124 742,100 Dividend yield was based on our current dividend yield as of the option grant date. Risk-free interest rate was based on zero coupon U.S. Treasury securities rates for the expected life of the options. Expected volatility was based on our historical stock price movements, as we believe that historical experience is the best available indicator of the expected volatility. Expected life of the option grant was based on historical exercise and cancellation patterns, as we believe that historical experience is the best estimate for future exercise patterns. Performance share awards are denominated in shares of our stock and are paid half in cash and half in stock. Payouts for performance share awards are based on two criteria: (1) 50% of the award is based on Olin’s total shareholder returns (TSR) over the applicable three-year performance cycle in relation to the TSR over the same period among a portfolio of public companies which are selected in concert with outside compensation consultants and (2) 50% of the award is based on Olin’s net income over the applicable three-year performance cycle in relation to the net income goal for such period as set by the compensation committee of Olin’s board of directors. The expense associated with performance shares is recorded based on our estimate of our performance relative to the respective target. If an employee leaves the company before the end of the performance cycle, the performance shares may be prorated based on the number of months of the performance cycle worked and are settled in cash instead of half in cash and half in stock when the three-year performance cycle is completed. The fair value of each performance share award based on net income was estimated on the date of grant, using the current stock price. The fair value of each performance share award based on TSR was estimated on the date of grant, using a Monte Carlo simulation model with the following weighted average assumptions: Grant date 2023 2022 Risk-free interest rate 4.46 % 1.74 % Expected volatility of Olin common stock 52 % 59 % Expected average volatility of peer companies 42 % 47 % Average correlation coefficient of peer companies 0.51 0.51 Expected life (years) 3.0 3.0 Grant date fair value (TSR based award) $ 86.98 $ 64.13 Grant date fair value (net income based award) $ 60.55 $ 49.71 Awards granted 161,474 184,000

SHAREHOLDERS' EQUITY

SHAREHOLDERS' EQUITY	9 Months Ended
SHAREHOLDERS' EQUITY	Sep. 30, 2023
Stockholders' Equity Note [Abstract]
SHAREHOLDERS' EQUITY	NOTE 14. SHAREHOLDERS’ EQUITY On July 28, 2022, our Board of Directors authorized a share repurchase program for the purchase of shares of common stock at an aggregate price of up to $2.0 billion (the 2022 Repurchase Authorization). This program will terminate upon the purchase of $2.0 billion of common stock. For the nine months ended September 30, 2023 and 2022, 10.8 million and 20.8 million shares, respectively, of common stock were repurchased and retired at a total value of $595.1 million and $1,100.6 million, respectively. As of September 30, 2023, 16.7 million shares of common stock have been repurchased and retired at a total value of $887.9 million under the 2022 Repurchase Authorization program, and $1,112.1 million of common stock remained authorized to be repurchased under the program. We issued 0.8 million and 0.9 million shares representing stock options exercised for the nine months ended September 30, 2023 and 2022, respectively, with a total value of $22.3 million and $21.3 million, respectively. The following table represents the activity included in accumulated other comprehensive loss: Foreign Currency Translation Adjustment Gains (Losses) on Derivative Contracts (net of taxes) Pension and Other Postretirement Benefits (net of taxes) Accumulated Other Comprehensive Loss ($ in millions) Balance at January 1, 2022 $ (10.9) $ 22.8 $ (499.9) $ (488.0) Unrealized (losses) gains: First quarter (10.5) 52.8 — 42.3 Second quarter (26.0) (36.4) — (62.4) Third quarter (25.1) 6.6 — (18.5) Reclassification adjustments of (gains) losses into income: First quarter — (12.4) 8.9 (3.5) Second quarter — (36.1) 9.0 (27.1) Third quarter — (17.8) 9.1 (8.7) Tax (provision) benefit: First quarter — (9.7) (2.3) (12.0) Second quarter — 17.5 (2.3) 15.2 Third quarter — 2.5 (2.1) 0.4 Net change (61.6) (33.0) 20.3 (74.3) Balance at September 30, 2022 $ (72.5) $ (10.2) $ (479.6) $ (562.3) Balance at January 1, 2023 $ (38.6) $ (32.5) $ (424.8) $ (495.9) Unrealized gains (losses): First quarter 5.5 (20.8) — (15.3) Second quarter (8.5) (10.7) — (19.2) Third quarter (3.3) (1.9) — (5.2) Reclassification adjustments of losses into income: First quarter — 30.7 0.4 31.1 Second quarter — 20.5 0.5 21.0 Third quarter — 10.2 0.2 10.4 Tax provision: First quarter — (2.5) (0.1) (2.6) Second quarter — (2.4) (0.1) (2.5) Third quarter — (2.1) — (2.1) Net change (6.3) 21.0 0.9 15.6 Balance at September 30, 2023 $ (44.9) $ (11.5) $ (423.9) $ (480.3) Net income and cost of goods sold included reclassification adjustments for realized gains and losses on derivative contracts from accumulated other comprehensive loss.

SEGMENT INFORMATION

SEGMENT INFORMATION	9 Months Ended
SEGMENT INFORMATION	Sep. 30, 2023
Segment Reporting [Abstract]
SEGMENT INFORMATION	NOTE 15. SEGMENT INFORMATION We define segment results as income (loss) before interest expense, interest income, other operating income (expense), non-operating pension income, other income and income taxes. We have three operating segments: Chlor Alkali Products and Vinyls, Epoxy and Winchester. The three operating segments reflect the organization used by our management for purposes of allocating resources and assessing performance. Chlorine and caustic soda used in our Epoxy segment is transferred at cost from the Chlor Alkali Products and Vinyls segment. BWA is consolidated in our Chlor Alkali Products and Vinyls segment. Sales are attributed to geographic areas based on customer location. Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Sales: ($ in millions) Chlor Alkali Products and Vinyls $ 969.6 $ 1,263.5 $ 3,089.0 $ 3,912.2 Epoxy 321.6 644.1 1,016.1 2,206.3 Winchester 380.2 414.1 1,113.3 1,280.7 Total sales $ 1,671.4 $ 2,321.7 $ 5,218.4 $ 7,399.2 Income (loss) before taxes: Chlor Alkali Products and Vinyls $ 172.3 $ 253.9 $ 598.3 $ 929.0 Epoxy (28.8) 80.1 (7.9) 358.0 Winchester 64.5 89.0 190.2 327.2 Corporate/other: Environmental expense (6.9) (7.4) (23.1) (18.0) Other corporate and unallocated costs (22.9) (27.5) (79.6) (92.8) Restructuring charges (11.9) (7.6) (92.0) (14.3) Other operating (expense) income (0.3) 13.0 27.2 16.3 Interest expense (46.2) (36.0) (133.9) (103.4) Interest income 1.0 0.5 3.2 1.2 Non-operating pension income 5.9 9.9 17.0 29.0 Income before taxes $ 126.7 $ 367.9 $ 499.4 $ 1,432.2 Other operating (expense) income for the nine months ended September 30, 2023 included a gain of $27.0 million for the sale of our domestic private trucking fleet and operations. Other operating (expense) income for both the three and nine months ended September 30, 2022 included a gain of $13.0 million for the sale of two former manufacturing facilities. Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Sales by geography: ($ in millions) Chlor Alkali Products and Vinyls United States $ 651.0 $ 870.8 $ 2,069.8 $ 2,636.6 Europe 57.9 80.9 175.3 233.7 Other foreign 260.7 311.8 843.9 1,041.9 Total Chlor Alkali Products and Vinyls 969.6 1,263.5 3,089.0 3,912.2 Epoxy United States 131.4 201.0 431.8 696.7 Europe 84.8 280.3 258.8 993.7 Other foreign 105.4 162.8 325.5 515.9 Total Epoxy 321.6 644.1 1,016.1 2,206.3 Winchester United States 327.7 377.2 982.9 1,180.3 Europe 19.8 7.5 43.4 27.0 Other foreign 32.7 29.4 87.0 73.4 Total Winchester 380.2 414.1 1,113.3 1,280.7 Total United States 1,110.1 1,449.0 3,484.5 4,513.6 Europe 162.5 368.7 477.5 1,254.4 Other foreign 398.8 504.0 1,256.4 1,631.2 Total sales $ 1,671.4 $ 2,321.7 $ 5,218.4 $ 7,399.2 Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Sales by product line: ($ in millions) Chlor Alkali Products and Vinyls Caustic soda $ 422.3 $ 598.4 $ 1,424.0 $ 1,752.4 Chlorine, chlorine-derivatives and other products 547.3 665.1 1,665.0 2,159.8 Total Chlor Alkali Products and Vinyls 969.6 1,263.5 3,089.0 3,912.2 Epoxy Aromatics and allylics 116.9 316.8 387.9 1,092.9 Epoxy resins 204.7 327.3 628.2 1,113.4 Total Epoxy 321.6 644.1 1,016.1 2,206.3 Winchester Commercial 181.2 271.6 581.1 906.4 Military and law enforcement 199.0 142.5 532.2 374.3 Total Winchester 380.2 414.1 1,113.3 1,280.7 Total sales $ 1,671.4 $ 2,321.7 $ 5,218.4 $ 7,399.2

ENVIRONMENTAL

ENVIRONMENTAL	9 Months Ended
ENVIRONMENTAL	Sep. 30, 2023
Environmental Remediation Obligations [Abstract]
ENVIRONMENTAL	NOTE 16. ENVIRONMENTAL We are party to various government and private environmental actions associated with past manufacturing facilities and former waste disposal sites. The condensed balance sheets included reserves for future environmental expenditures to investigate and remediate known sites amounting to $153.5 million, $146.6 million and $149.3 million at September 30, 2023, December 31, 2022 and September 30, 2022, respectively, of which $128.5 million, $121.6 million and $124.3 million, respectively, were classified as other noncurrent liabilities. Environmental provisions charged to income, which are included in costs of goods sold, were $6.9 million and $7.4 million for the three months ended September 30, 2023 and 2022, respectively, and $23.1 million and $18.0 million for the nine months ended September 30, 2023 and 2022, respectively. Environmental exposures are difficult to assess for numerous reasons, including the identification of new sites, developments at sites resulting from investigatory studies, advances in technology, changes in environmental laws and regulations and their application, changes in regulatory authorities, the scarcity of reliable data pertaining to identified sites, the difficulty in assessing the involvement and financial capability of other Potentially Responsible Parties (PRPs), our ability to obtain contributions from other parties and the lengthy time periods over which site remediation occurs. It is possible that some of these matters (the outcomes of which are subject to various uncertainties) may be resolved unfavorably to us, which could materially adversely affect our financial position or results of operations.

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	9 Months Ended
COMMITMENTS AND CONTINGENCIES	Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	NOTE 17. COMMITMENTS AND CONTINGENCIES Olin, K.A. Steel Chemicals (a wholly owned subsidiary of Olin) and other caustic soda producers were named as defendants in six purported class action civil lawsuits filed March 22, 25 and 26, 2019 and April 12, 2019 in the U.S. District Court for the Western District of New York. Those cases were consolidated on May 22, 2019; the claims in the consolidated “Direct Purchaser” lawsuit, as modified, are on behalf of the respective named plaintiffs and a putative class comprised of all persons and entities who purchased certain types of caustic soda in the U.S. directly from one or more of the defendants, their parents, predecessors, subsidiaries or affiliates at any time on or after October 1, 2015 through December 31, 2018. In August 2023, one of the other defendants announced that it had settled the Direct Purchaser lawsuit and sought court approval of that settlement. Olin, K.A. Steel Chemicals and other caustic soda producers were also named as defendants in two purported class action civil lawsuits filed July 25 and 29, 2019 in the U.S. District Court for the Western District of New York on behalf of the respective named plaintiffs and a putative class comprised of all persons and entities who purchased caustic soda in the U.S. indirectly from distributors at any time on or after October 1, 2015. Those cases were consolidated and a consolidated, amended complaint in the “Indirect Purchaser” lawsuit was filed on August 23, 2021. The other current defendants in the Direct Purchaser and Indirect Purchaser lawsuits are Occidental Chemical Corporation d/b/a OxyChem, Westlake Chemical Corporation, Shin-Etsu Chemical Co., Ltd., and Formosa Plastics Corporation, U.S.A. The Direct Purchaser and Indirect Purchaser lawsuits allege the defendants conspired to fix, raise, maintain and stabilize the price of caustic soda, restrict domestic (U.S.) supply of caustic soda and allocate caustic soda customers. Plaintiffs seek damages and injunctive relief. Olin, K.A. Steel Chemical, Olin Canada ULC, 3229897 Nova Scotia Co. (wholly owned subsidiaries of Olin) and other alleged caustic soda producers were named as defendants in a proposed class action civil lawsuit filed on October 7, 2020 in the Quebec Superior Court (Province of Quebec) on behalf of the respective named plaintiff and a putative class comprised of all Canadian persons and entities who, between October 1, 2015 and the date of the eventual class action certification, directly or indirectly purchased caustic soda or products containing caustic soda, produced by one or more of the defendants. Olin, K.A. Steel Chemical, Olin Canada ULC, 3229897 Nova Scotia Co. and other alleged caustic soda producers were also named as defendants in a proposed class action civil lawsuit filed November 13, 2020 in the Federal Court of Canada on behalf of the respective named plaintiff and a putative class comprised of all legal persons in Canada who, at any time on or after October 1, 2015 to the present, directly or indirectly purchased caustic soda. The other defendants named in the two Canadian lawsuits are Occidental Petroleum Corporation, Occidental Chemical Corporation, Oxy Canada Sales, Inc., Westlake Chemical Corporation, Axiall Canada, Inc., Shin-Etsu Chemical Co., Ltd., Shintech Incorporated, Formosa Plastics Corporation, and Formosa Plastics Corporation, U.S.A. The lawsuits allege the defendants conspired to fix, raise, maintain control, and stabilize the price of caustic soda, divide and allocate markets, sales, customers and territories, fix, maintain, control, prevent, restrict, lessen or eliminate production and supply of caustic soda, and agree to idle capacity of production and/or refrain from increasing their production capacity. Plaintiffs seek damages, including punitive damages. We believe we have meritorious legal positions and will continue to represent our interests vigorously in the above matters. Any losses related to these matters are not currently estimable because of unresolved questions of fact and law, but if resolved unfavorably to Olin, could have a material adverse effect on our financial position, cash flows or results of operations. We, and our subsidiaries, are defendants in various other legal actions (including proceedings based on alleged exposures to asbestos) incidental to our past and current business activities. As of September 30, 2023, December 31, 2022 and September 30, 2022, our condensed balance sheets included accrued liabilities for these other legal actions of $15.3 million, $14.4 million and $14.2 million, respectively. These liabilities do not include costs associated with legal representation. Based on our analysis, and considering the inherent uncertainties associated with litigation, we do not believe that it is reasonably possible that these other legal actions will materially adversely affect our financial position, cash flows or results of operations. During the ordinary course of our business, contingencies arise resulting from an existing condition, situation or set of circumstances involving an uncertainty as to the realization of a possible gain contingency. In certain instances, such as environmental projects, we are responsible for managing the cleanup and remediation of an environmental site. There exists the possibility of recovering a portion of these costs from other parties. We account for gain contingencies in accordance with the provisions of ASC 450 “Contingencies” and, therefore, do not record gain contingencies and recognize income until it is earned and realizable.

DERIVATIVE FINANCIAL INSTRUMENT

DERIVATIVE FINANCIAL INSTRUMENTS	9 Months Ended
DERIVATIVE FINANCIAL INSTRUMENTS	Sep. 30, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE FINANCIAL INSTRUMENTS	NOTE 18. DERIVATIVE FINANCIAL INSTRUMENTS We are exposed to market risk in the normal course of our business operations due to our purchases of certain commodities, our ongoing investing and financing activities and our operations that use foreign currencies. The risk of loss can be assessed from the perspective of adverse changes in fair values, cash flows and future earnings. We have established policies and procedures governing our management of market risks and the use of financial instruments to manage exposure to such risks. ASC 815 “Derivatives and Hedging” (ASC 815) requires an entity to recognize all derivatives as either assets or liabilities in the condensed balance sheets and measure those instruments at fair value. In accordance with ASC 815, we designate derivative contracts as cash flow hedges of forecasted purchases of commodities and forecasted interest payments related to variable-rate borrowings and designate certain interest rate swaps as fair value hedges of fixed-rate borrowings. We do not enter into any derivative instruments for trading or speculative purposes. Energy costs, including electricity and natural gas, and certain raw materials used in our production processes are subject to price volatility. Depending on market conditions, we may enter into futures contracts, forward contracts, commodity swaps and put and call option contracts in order to reduce the impact of commodity price fluctuations. The majority of our commodity derivatives expire within one year. We actively manage currency exposures that are associated with net monetary asset positions, currency purchases and sales commitments denominated in foreign currencies and foreign currency denominated assets and liabilities created in the normal course of business. We enter into forward sales and purchase contracts to manage currency risk to offset our net exposures, by currency, related to the foreign currency denominated monetary assets and liabilities of our operations. All of the currency derivatives expire within one year and are for U.S. dollar (USD) equivalents. The counterparties to the forward contracts are large financial institutions; however, the risk of loss to us in the event of nonperformance by a counterparty could be significant to our financial position or results of operations. We had the following notional amounts of outstanding forward contracts to buy and sell foreign currency: September 30, 2023 December 31, 2022 September 30, 2022 ($ in millions) Foreign Currency: Buy 5.3 275.8 273.6 Sell 155.2 110.7 96.0 Cash Flow Hedges For derivative instruments that are designated and qualify as a cash flow hedge, the change in fair value of the derivative is recognized as a component of other comprehensive income (loss) until the hedged item is recognized in earnings. We had the following notional amounts of outstanding commodity contracts that were entered into to hedge forecasted purchases: September 30, 2023 December 31, 2022 September 30, 2022 ($ in millions) Natural gas $ 67.2 $ 107.6 $ 92.1 Ethane 25.5 46.0 45.5 Metals 114.8 107.6 134.5 Total notional $ 207.5 $ 261.2 $ 272.1 As of September 30, 2023, the counterparties to these commodity contracts were Wells Fargo Bank, N.A., Citibank, N.A., JPMorgan Chase Bank, National Association, Bank of America Corporation and The Toronto Dominion Bank, all of which are major financial institutions. We use cash flow hedges for certain raw material and energy costs such as copper, zinc, lead, ethane, electricity and natural gas to provide a measure of stability in managing our exposure to price fluctuations associated with forecasted purchases of raw materials and energy used in our manufacturing process. At September 30, 2023, we had open derivative contract positions through 2028. If all open futures contracts had been settled on September 30, 2023, we would have recognized a pretax loss of $15.5 million. If commodity prices were to remain at September 30, 2023 levels, approximately $12.6 million of deferred losses, net of tax, would be reclassified into earnings during the next twelve months. The actual effect on earnings will be dependent on actual commodity prices when the forecasted transactions occur. Fair Value Hedges We use interest rate swaps as a means of managing interest expense and floating interest rate exposure to optimal levels. For derivative instruments that are designated and qualify as a fair value hedge, the gain or loss on the derivative as well as the offsetting loss or gain on the hedged item attributable to the hedged risk are recognized in current earnings. We include the gain or loss on the hedged items (fixed-rate borrowings) in the same line item, interest expense, as the offsetting loss or gain on the related interest rate swaps. Financial Statement Impacts We present our derivative assets and liabilities in our condensed balance sheets on a net basis whenever we have a legally enforceable master netting agreement with the counterparty to our derivative contracts. We use these agreements to manage and substantially reduce our potential counterparty credit risk. The following table summarizes the location and fair value of the derivative instruments on our condensed balance sheets. The table disaggregates our net derivative assets and liabilities into gross components on a contract-by-contract basis before giving effect to master netting arrangements: September 30, 2023 December 31, 2022 September 30, 2022 ($ in millions) Asset derivatives: Other current assets Derivatives designated as hedging instruments: Commodity contracts - gains $ 1.7 $ 2.4 $ 15.1 Commodity contracts - losses (0.4) (0.9) (1.5) Derivatives not designated as hedging instruments: Foreign exchange contracts - gains 1.2 0.3 1.3 Foreign exchange contracts - losses (0.1) — (0.2) Total other current assets 2.4 1.8 14.7 Other assets Derivatives designated as hedging instruments: Commodity contracts - gains 3.2 4.0 3.8 Commodity contracts - losses — — (0.1) Total other assets 3.2 4.0 3.7 Total asset derivatives (1) $ 5.6 $ 5.8 $ 18.4 Liability derivatives: Accrued liabilities Derivatives designated as hedging instruments: Commodity contracts - losses $ 19.3 $ 43.3 $ 34.7 Commodity contracts - gains (1.5) (1.7) (6.8) Derivatives not designated as hedging instruments: Foreign exchange contracts - losses — 1.7 5.3 Foreign exchange contracts - gains — (0.8) (1.8) Total accrued liabilities 17.8 42.5 31.4 Other liabilities Derivatives designated as hedging instruments: Commodity contracts - losses 2.5 8.0 2.6 Commodity contracts - gains (0.3) (0.6) — Total other liabilities 2.2 7.4 2.6 Total liability derivatives (1) $ 20.0 $ 49.9 $ 34.0 (1) Does not include the impact of cash collateral received from or provided to counterparties. The following table summarizes the effects of derivative instruments on our condensed statements of operations: Amount of Gain (Loss) Three Months Ended September 30, Nine Months Ended September 30, Location of Gain (Loss) 2023 2022 2023 2022 Derivatives – Cash Flow Hedges ($ in millions) Recognized in other comprehensive loss: Commodity contracts ——— $ (1.9) $ 6.6 $ (33.4) $ 23.0 Reclassified from accumulated other comprehensive loss into income: Commodity contracts Cost of goods sold $ (10.2) $ 17.8 $ (61.4) $ 66.3 Derivatives Not Designated as Hedging Instruments Commodity contracts Cost of goods sold $ — $ — $ (0.6) $ 0.5 Foreign exchange contracts Selling and administration $ 3.6 $ (15.6) $ (9.6) $ (42.7) Credit Risk and Collateral By using derivative instruments, we are exposed to credit and market risk. If a counterparty fails to fulfill its performance obligations under a derivative contract, our credit risk will equal the fair value gain in a derivative. Generally, when the fair value of a derivative contract is positive, this indicates that the counterparty owes us, thus creating a repayment risk for us. When the fair value of a derivative contract is negative, we owe the counterparty and, therefore, assume no repayment risk. We minimize the credit (or repayment) risk in derivative instruments by entering into transactions with high-quality counterparties. We monitor our positions and the credit ratings of our counterparties, and we do not anticipate non-performance by the counterparties. Based on the agreements with our various counterparties, cash collateral is required to be provided when the net fair value of the derivatives, with the counterparty, exceeds a specific threshold. If the threshold is exceeded, cash is either provided by the counterparty to us if the value of the derivatives is our asset, or cash is provided by us to the counterparty if the value of the derivatives is our liability. As of September 30, 2023, December 31, 2022 and September 30, 2022, this threshold was not exceeded. In all instances where we are party to a master netting agreement, we offset the receivable or payable recognized upon payment of cash collateral against the fair value amounts recognized for derivative instruments that have also been offset under such master netting agreements.

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS	9 Months Ended
FAIR VALUE MEASUREMENTS	Sep. 30, 2023
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	NOTE 19. FAIR VALUE MEASUREMENTS Fair value is defined as the price at which an asset could be exchanged in a current transaction between knowledgeable, willing parties or the amount that would be paid to transfer a liability to a new obligor, not the amount that would be paid to settle the liability with the creditor. Where available, fair value is based on observable market prices or parameters or derived from such prices or parameters. Where observable prices or inputs are not available, valuation models are applied. These valuation techniques involve some level of management estimation and judgment, the degree of which is dependent on the price transparency for the instruments or market and the instruments’ complexity. Assets and liabilities recorded at fair value in the condensed balance sheets are categorized based upon the level of judgment associated with the inputs used to measure their fair value. Hierarchical levels, defined by ASC 820 “Fair Value Measurements and Disclosures” (ASC 820) are directly related to the amount of subjectivity associated with the inputs to fair valuation of these assets and liabilities, and are as follows: Level 1 — Inputs were unadjusted, quoted prices in active markets for identical assets or liabilities at the measurement date. Level 2 — Inputs (other than quoted prices included in Level 1) were either directly or indirectly observable for the asset or liability through correlation with market data at the measurement date and for the duration of the instrument’s anticipated life. Level 3 — Inputs reflected management’s best estimate of what market participants would use in pricing the asset or liability at the measurement date. Consideration was given to the risk inherent in the valuation technique and the risk inherent in the inputs to the model. We are required to separately disclose assets and liabilities measured at fair value on a recurring basis, from those measured at fair value on a nonrecurring basis. Nonfinancial assets measured at fair value on a nonrecurring basis are intangible assets and goodwill, which are reviewed for impairment annually in the fourth quarter and/or when circumstances or other events indicate that impairment may have occurred. Determining which hierarchical level an asset or liability falls within requires significant judgment. We evaluate our hierarchy disclosures each quarter. The following table summarizes the assets and liabilities measured at fair value in the condensed balance sheets: Fair Value Measurements Balance at September 30, 2023 Level 1 Level 2 Level 3 Total Assets ($ in millions) Commodity contracts $ — $ 4.5 $ — $ 4.5 Foreign exchange contracts — 1.1 — 1.1 Total Assets $ — $ 5.6 $ — $ 5.6 Liabilities Commodity contracts $ — $ 20.0 $ — $ 20.0 Total Liabilities $ — $ 20.0 $ — $ 20.0 Balance at December 31, 2022 Assets Commodity contracts $ — $ 5.5 $ — $ 5.5 Foreign exchange contracts — 0.3 — 0.3 Total Assets $ — $ 5.8 $ — $ 5.8 Liabilities Commodity contracts $ — $ 49.0 $ — $ 49.0 Foreign exchange contracts — 0.9 — 0.9 Total Liabilities $ — $ 49.9 $ — $ 49.9 Balance at September 30, 2022 Assets Commodity contracts $ — $ 17.3 $ — $ 17.3 Foreign exchange contracts — 1.1 — 1.1 Total Assets $ — $ 18.4 $ — $ 18.4 Liabilities Commodity contracts $ — $ 30.5 $ — $ 30.5 Foreign exchange contracts — 3.5 — 3.5 Total Liabilities $ — $ 34.0 $ — $ 34.0 Commodity Contracts Commodity contract financial instruments were valued primarily based on prices and other relevant information observable in market transactions involving identical or comparable assets or liabilities including both forward and spot prices for commodities. We use commodity derivative contracts for certain raw materials and energy costs such as copper, zinc, lead, ethane, electricity and natural gas to provide a measure of stability in managing our exposure to price fluctuations. Foreign Currency Contracts Foreign currency contract financial instruments were valued primarily based on relevant information observable in market transactions involving identical or comparable assets or liabilities including both forward and spot prices for currencies. We enter into forward sales and purchase contracts to manage currency risk resulting from purchase and sale commitments denominated in foreign currencies. Financial Instruments The carrying values of cash and cash equivalents, accounts receivable and accounts payable approximated fair values due to the short-term maturities of these instruments. Since our long-term debt instruments may not be actively traded, the inputs used to measure the fair value of our long-term debt are based on current market rates for debt of similar risk and maturities and is classified as Level 2 in the fair value measurement hierarchy. As of September 30, 2023, December 31, 2022 and September 30, 2022, the fair value measurements of debt were $2,666.9 million, $2,517.7 million and $2,386.5 million, respectively. Nonrecurring Fair Value Measurements In addition to assets and liabilities that are recorded at fair value on a recurring basis, we record assets and liabilities at fair value on a nonrecurring basis as required by ASC 820. There were no assets or liabilities measured at fair value on a nonrecurring basis as of September 30, 2023, December 31, 2022 and September 30, 2022.

SUBSEQUENT EVENT

SUBSEQUENT EVENT	9 Months Ended
SUBSEQUENT EVENT	Sep. 30, 2023
Subsequent Events [Abstract]
Subsequent Events	NOTE 20. SUBSEQUENT EVENT On October 1, 2023, Olin acquired the assets of White Flyer Targets, LLC (“White Flyer”) from Reagent Diversified Holdings, Inc. for $63.7 million, subject to normal post-closing adjustments. The acquisition was financed with cash on hand. White Flyer designs, manufactures and sells recreational trap, skeet, international and sporting clay targets and will be included in Olin’s existing Winchester segment. The initial purchase accounting of the transaction is not yet complete as a result of the timing of the acquisition. The acquisition is not material and therefore supplemental pro forma financial information is not provided.

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
Pay vs Performance Disclosure, Table			Pay vs Performance Disclosure
Net (loss) income	$ 104.5	$ 315.2	$ 403.2	$ 1,130.3

Insider Trading Arrangements

Insider Trading Arrangements	9 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

RESTRUCTURING CHARGES (Tables)

RESTRUCTURING CHARGES (Tables)	9 Months Ended
RESTRUCTURING CHARGES (Tables)	Sep. 30, 2023
Restructuring and Related Activities [Abstract]
Schedule of Restructuring Reserve by Type of Cost	The following table summarizes the 2023 and 2022 activities by major component of these restructuring actions and the remaining balances of accrued restructuring costs as of September 30, 2023 and 2022: Employee severance and related benefit costs Lease and other contract termination costs Facility exit costs Write-off of equipment and facility Total ($ in millions) Balance at January 1, 2022 $ 6.9 $ 5.4 $ — $ — $ 12.3 Restructuring charges: First quarter — 0.1 2.6 0.4 3.1 Second quarter — 0.2 3.1 0.3 3.6 Third quarter — — 4.9 2.7 7.6 Amounts utilized (4.3) (1.3) (10.6) (3.4) (19.6) Balance at September 30, 2022 $ 2.6 $ 4.4 $ — $ — $ 7.0 Balance at January 1, 2023 $ 9.4 $ 4.2 $ — $ — $ 13.6 Restructuring charges: First quarter — 39.7 8.4 12.8 60.9 Second quarter 3.3 1.7 9.3 4.9 19.2 Third quarter 2.6 2.0 7.3 — 11.9 Amounts utilized (3.4) (13.4) (25.0) (17.7) (59.5) Balance at September 30, 2023 $ 11.9 $ 34.2 $ — $ — $ 46.1
Cumulative Restructuring Charges by Type and Plan	The following table summarizes the cumulative restructuring charges of these restructuring actions by major component through September 30, 2023: Chlor Alkali Products and Vinyls Epoxy Corporate/other Total McIntosh Plan Freeport 2021 Plan Freeport 2019 Plan Chlor Alkali 2016 Plan Epoxy Optimization Plan Productivity Plan ($ in millions) Write-off of equipment and facility $ 2.7 $ — $ 58.9 $ 78.1 $ 18.3 $ — $ 158.0 Employee severance and related benefit costs — — 2.1 6.7 13.3 10.3 32.4 Facility exit costs 9.4 11.9 16.5 53.2 12.7 — 103.7 Employee relocation costs — — — 1.7 — — 1.7 Lease and other contract termination costs 6.4 — — 43.0 43.4 — 92.8 Total cumulative restructuring charges $ 18.5 $ 11.9 $ 77.5 $ 182.7 $ 87.7 $ 10.3 $ 388.6

EARNINGS PER SHARE (Tables)

EARNINGS PER SHARE (Tables)	9 Months Ended
EARNINGS PER SHARE (Tables)	Sep. 30, 2023
Earnings Per Share [Abstract]
Basic and Diluted Earnings Per Share Table	Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Computation of Net Income per Share (In millions, except per share data) Net income $ 104.5 $ 315.2 $ 403.2 $ 1,130.3 Net income (loss) attributable to noncontrolling interests 0.4 — (4.1) — Net income attributable to Olin Corporation $ 104.1 $ 315.2 $ 407.3 $ 1,130.3 Basic shares 124.2 141.2 127.5 148.3 Basic net income attributable to Olin Corporation per share $ 0.84 $ 2.23 $ 3.19 $ 7.62 Diluted shares: Basic shares 124.2 141.2 127.5 148.3 Stock-based compensation 2.8 3.1 3.1 3.6 Diluted shares 127.0 144.3 130.6 151.9 Diluted net income attributable to Olin Corporation per share $ 0.82 $ 2.18 $ 3.12 $ 7.44

ACCOUNTS RECEIVABLES (Tables)

ACCOUNTS RECEIVABLES (Tables)	9 Months Ended
ACCOUNTS RECEIVABLES (Tables)	Sep. 30, 2023
Receivables [Abstract]
AR Facilities	The following table summarizes the AR Facilities activity: September 30, 2023 2022 ($ in millions) Balance at beginning of year $ 111.8 $ 83.3 Gross receivables sold 749.5 769.3 Payments received from customers on sold accounts (788.6) (761.3) Balance at end of period $ 72.7 $ 91.3

INVENTORIES (Tables)

INVENTORIES (Tables)	9 Months Ended
INVENTORIES (Tables)	Sep. 30, 2023
Inventory Disclosure [Abstract]
Inventories Table	Inventories consisted of the following: September 30, 2023 December 31, September 30, 2022 ($ in millions) Supplies $ 150.3 $ 137.6 $ 137.2 Raw materials 178.3 201.2 203.4 Work in process 188.4 199.6 189.6 Finished goods 615.5 559.3 569.2 Inventories excluding LIFO reserve 1,132.5 1,097.7 1,099.4 LIFO reserve (154.8) (155.8) (154.3) Inventories, net $ 977.7 $ 941.9 $ 945.1

OTHER ASSETS (Tables)

OTHER ASSETS (Tables)	9 Months Ended
OTHER ASSETS (Tables)	Sep. 30, 2023
Other Assets [Abstract]
Schedule of Other Assets	Included in other assets were the following: September 30, 2023 December 31, 2022 September 30, 2022 ($ in millions) Supply contracts $ 1,060.6 $ 1,048.0 $ 1,013.8 Other 56.7 54.5 76.9 Other assets $ 1,117.3 $ 1,102.5 $ 1,090.7

GOODWILL AND INTANGIBLE ASSETS

GOODWILL AND INTANGIBLE ASSETS (Tables)	9 Months Ended
GOODWILL AND INTANGIBLE ASSETS (Tables)	Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	Changes in the carrying value of goodwill were as follows: Chlor Alkali Products and Vinyls Epoxy Total ($ in millions) Balance at January 1, 2022 $ 1,275.6 $ 145.0 $ 1,420.6 Foreign currency translation adjustment 0.5 0.1 0.6 Balance at September 30, 2022 $ 1,276.1 $ 145.1 $ 1,421.2 Balance at January 1, 2023 $ 1,275.8 $ 145.1 $ 1,420.9 Foreign currency translation adjustment 0.1 — 0.1 Balance at September 30, 2023 $ 1,275.9 $ 145.1 $ 1,421.0
Schedule of Finite-Lived Intangible Assets	Intangible assets consisted of the following: September 30, 2023 December 31, 2022 September 30, 2022 Gross Amount Accumulated Amortization Net Gross Amount Accumulated Amortization Net Gross Amount Accumulated Amortization Net ($ in millions) Customers, customer contracts and relationships $ 668.0 $ (426.8) $ 241.2 $ 669.1 $ (401.2) $ 267.9 $ 662.0 $ (389.3) $ 272.7 Acquired technology 92.8 (89.4) 3.4 93.1 (88.3) 4.8 91.9 (86.5) 5.4 Other 4.7 (0.7) 4.0 1.8 (0.7) 1.1 1.8 (0.7) 1.1 Total intangible assets $ 765.5 $ (516.9) $ 248.6 $ 764.0 $ (490.2) $ 273.8 $ 755.7 $ (476.5) $ 279.2

DEBT (Tables)

DEBT (Tables)	9 Months Ended
DEBT (Tables)	Sep. 30, 2023
Debt Disclosure [Abstract]
Schedule of Debt	Long-term Debt Borrowings (Repayments) September 30, 2023 September 30, 2022 Debt Instruments ($ in millions) Borrowings: Senior Revolving Credit Facility 255.0 170.0 Receivables Financing Agreement 332.7 45.0 Total borrowings $ 587.7 $ 215.0 Repayments: 5.50% senior notes due 2022 — (200.0) Senior Term Loan (6.6) — Senior Revolving Credit Facility (90.0) (170.0) Receivables Financing Agreement (282.7) (45.0) Finance leases (1.8) (0.9) Total repayments $ (381.1) $ (415.9) Long-term debt borrowings (repayments), net $ 206.6 $ (200.9)

PENSION PLANS AND RETIREMENT _2

PENSION PLANS AND RETIREMENT BENEFITS (Tables)	9 Months Ended
PENSION PLANS AND RETIREMENT BENEFITS (Tables)	Sep. 30, 2023
Retirement Benefits [Abstract]
Components of Net Periodic Benefit (Income) Cost	Pension Benefits Other Postretirement Benefits Three Months Ended September 30, Three Months Ended September 30, 2023 2022 2023 2022 Components of Net Periodic Benefit (Income) Cost ($ in millions) Service cost $ 1.4 $ 2.0 $ 0.1 $ 0.2 Interest cost 26.4 15.1 0.4 0.2 Expected return on plans’ assets (32.9) (34.3) — — Amortization of prior service cost (0.1) — — — Recognized actuarial loss 0.3 9.0 — 0.1 Net periodic benefit (income) cost $ (4.9) $ (8.2) $ 0.5 $ 0.5 Pension Benefits Other Postretirement Benefits Nine Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Components of Net Periodic Benefit (Income) Cost ($ in millions) Service cost $ 4.2 $ 6.5 $ 0.5 $ 0.8 Interest cost 79.1 46.0 1.3 0.8 Expected return on plans’ assets (98.5) (102.8) — — Amortization of prior service cost (0.3) (0.4) 0.1 0.1 Recognized actuarial loss 0.9 26.2 0.4 1.1 Net periodic benefit (income) cost $ (14.6) $ (24.5) $ 2.3 $ 2.8

INCOME TAXES (Tables)

INCOME TAXES (Tables)	9 Months Ended
INCOME TAXES (Tables)	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits	The amounts of unrecognized tax benefits were as follows: September 30, 2023 2022 ($ in millions) Balance at beginning of year $ 51.6 $ 43.4 Increases for prior year tax positions 1.3 0.3 Decreases for prior year tax positions (0.3) (0.7) Increases for current year tax positions 10.1 5.9 Foreign currency translation adjustments (0.6) (4.1) Balance at end of period $ 62.1 $ 44.8
Tax Returns Subject to Examination	For our primary tax jurisdictions, the tax years that remain subject to examination are as follows: Tax Years U.S. federal income tax 2018 - 2022 U.S. state income tax 2012 - 2022 Canadian federal income tax 2016 - 2022 Brazil 2016 - 2022 Germany 2015 - 2022 China 2014 - 2022 The Netherlands 2016 - 2022

STOCK-BASED COMPENSATION (Table

STOCK-BASED COMPENSATION (Tables)	9 Months Ended
STOCK-BASED COMPENSATION (Tables)	Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]
Stock-based compensation expense	Stock-based compensation expense (benefit) was as follows: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 ($ in millions) Stock-based compensation $ 6.7 $ 5.8 $ 19.5 $ 20.0 Mark-to-market adjustments (2.3) (2.0) (2.4) (10.5) Total expense $ 4.4 $ 3.8 $ 17.1 $ 9.5
Schedule of fair value of stock options granted valuation assumptions	The fair value of each stock option granted, which typically vests ratably over three years, but not less than one year, was estimated on the date of grant, using the Black-Scholes option-pricing model with the following weighted-average assumptions: Grant date 2023 2022 Dividend yield 1.32 % 1.60 % Risk-free interest rate 4.07 % 1.93 % Expected volatility of Olin common stock 47 % 48 % Expected life (years) 7.0 7.0 Weighted-average grant fair value (per option) $ 28.74 $ 21.18 Weighted-average exercise price $ 60.55 $ 49.71 Options granted 562,124 742,100
Schedule of fair value of performance share awards granted valuation assumptions	The fair value of each performance share award based on TSR was estimated on the date of grant, using a Monte Carlo simulation model with the following weighted average assumptions: Grant date 2023 2022 Risk-free interest rate 4.46 % 1.74 % Expected volatility of Olin common stock 52 % 59 % Expected average volatility of peer companies 42 % 47 % Average correlation coefficient of peer companies 0.51 0.51 Expected life (years) 3.0 3.0 Grant date fair value (TSR based award) $ 86.98 $ 64.13 Grant date fair value (net income based award) $ 60.55 $ 49.71 Awards granted 161,474 184,000

SHAREHOLDERS' EQUITY (Tables)

SHAREHOLDERS' EQUITY (Tables)	9 Months Ended
SHAREHOLDERS' EQUITY (Tables)	Sep. 30, 2023
Stockholders' Equity Note [Abstract]
Activity included in accumulated other comprehensive loss table	The following table represents the activity included in accumulated other comprehensive loss: Foreign Currency Translation Adjustment Gains (Losses) on Derivative Contracts (net of taxes) Pension and Other Postretirement Benefits (net of taxes) Accumulated Other Comprehensive Loss ($ in millions) Balance at January 1, 2022 $ (10.9) $ 22.8 $ (499.9) $ (488.0) Unrealized (losses) gains: First quarter (10.5) 52.8 — 42.3 Second quarter (26.0) (36.4) — (62.4) Third quarter (25.1) 6.6 — (18.5) Reclassification adjustments of (gains) losses into income: First quarter — (12.4) 8.9 (3.5) Second quarter — (36.1) 9.0 (27.1) Third quarter — (17.8) 9.1 (8.7) Tax (provision) benefit: First quarter — (9.7) (2.3) (12.0) Second quarter — 17.5 (2.3) 15.2 Third quarter — 2.5 (2.1) 0.4 Net change (61.6) (33.0) 20.3 (74.3) Balance at September 30, 2022 $ (72.5) $ (10.2) $ (479.6) $ (562.3) Balance at January 1, 2023 $ (38.6) $ (32.5) $ (424.8) $ (495.9) Unrealized gains (losses): First quarter 5.5 (20.8) — (15.3) Second quarter (8.5) (10.7) — (19.2) Third quarter (3.3) (1.9) — (5.2) Reclassification adjustments of losses into income: First quarter — 30.7 0.4 31.1 Second quarter — 20.5 0.5 21.0 Third quarter — 10.2 0.2 10.4 Tax provision: First quarter — (2.5) (0.1) (2.6) Second quarter — (2.4) (0.1) (2.5) Third quarter — (2.1) — (2.1) Net change (6.3) 21.0 0.9 15.6 Balance at September 30, 2023 $ (44.9) $ (11.5) $ (423.9) $ (480.3)

SEGMENT INFORMATION (Tables)

SEGMENT INFORMATION (Tables)	9 Months Ended
SEGMENT INFORMATION (Tables)	Sep. 30, 2023
Segment Reporting [Abstract]
Segment Information	Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Sales: ($ in millions) Chlor Alkali Products and Vinyls $ 969.6 $ 1,263.5 $ 3,089.0 $ 3,912.2 Epoxy 321.6 644.1 1,016.1 2,206.3 Winchester 380.2 414.1 1,113.3 1,280.7 Total sales $ 1,671.4 $ 2,321.7 $ 5,218.4 $ 7,399.2 Income (loss) before taxes: Chlor Alkali Products and Vinyls $ 172.3 $ 253.9 $ 598.3 $ 929.0 Epoxy (28.8) 80.1 (7.9) 358.0 Winchester 64.5 89.0 190.2 327.2 Corporate/other: Environmental expense (6.9) (7.4) (23.1) (18.0) Other corporate and unallocated costs (22.9) (27.5) (79.6) (92.8) Restructuring charges (11.9) (7.6) (92.0) (14.3) Other operating (expense) income (0.3) 13.0 27.2 16.3 Interest expense (46.2) (36.0) (133.9) (103.4) Interest income 1.0 0.5 3.2 1.2 Non-operating pension income 5.9 9.9 17.0 29.0 Income before taxes $ 126.7 $ 367.9 $ 499.4 $ 1,432.2
Disaggregation of Revenue	Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Sales by geography: ($ in millions) Chlor Alkali Products and Vinyls United States $ 651.0 $ 870.8 $ 2,069.8 $ 2,636.6 Europe 57.9 80.9 175.3 233.7 Other foreign 260.7 311.8 843.9 1,041.9 Total Chlor Alkali Products and Vinyls 969.6 1,263.5 3,089.0 3,912.2 Epoxy United States 131.4 201.0 431.8 696.7 Europe 84.8 280.3 258.8 993.7 Other foreign 105.4 162.8 325.5 515.9 Total Epoxy 321.6 644.1 1,016.1 2,206.3 Winchester United States 327.7 377.2 982.9 1,180.3 Europe 19.8 7.5 43.4 27.0 Other foreign 32.7 29.4 87.0 73.4 Total Winchester 380.2 414.1 1,113.3 1,280.7 Total United States 1,110.1 1,449.0 3,484.5 4,513.6 Europe 162.5 368.7 477.5 1,254.4 Other foreign 398.8 504.0 1,256.4 1,631.2 Total sales $ 1,671.4 $ 2,321.7 $ 5,218.4 $ 7,399.2 Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Sales by product line: ($ in millions) Chlor Alkali Products and Vinyls Caustic soda $ 422.3 $ 598.4 $ 1,424.0 $ 1,752.4 Chlorine, chlorine-derivatives and other products 547.3 665.1 1,665.0 2,159.8 Total Chlor Alkali Products and Vinyls 969.6 1,263.5 3,089.0 3,912.2 Epoxy Aromatics and allylics 116.9 316.8 387.9 1,092.9 Epoxy resins 204.7 327.3 628.2 1,113.4 Total Epoxy 321.6 644.1 1,016.1 2,206.3 Winchester Commercial 181.2 271.6 581.1 906.4 Military and law enforcement 199.0 142.5 532.2 374.3 Total Winchester 380.2 414.1 1,113.3 1,280.7 Total sales $ 1,671.4 $ 2,321.7 $ 5,218.4 $ 7,399.2

DERIVATIVE FINANCIAL INSTRUME_2

DERIVATIVE FINANCIAL INSTRUMENTS (Tables)	9 Months Ended
DERIVATIVE FINANCIAL INSTRUMENTS (Tables)	Sep. 30, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Open Forward Foreign Currency Contract	We had the following notional amounts of outstanding forward contracts to buy and sell foreign currency: September 30, 2023 December 31, 2022 September 30, 2022 ($ in millions) Foreign Currency: Buy 5.3 275.8 273.6 Sell 155.2 110.7 96.0
Schedule of derivative instruments	We had the following notional amounts of outstanding commodity contracts that were entered into to hedge forecasted purchases: September 30, 2023 December 31, 2022 September 30, 2022 ($ in millions) Natural gas $ 67.2 $ 107.6 $ 92.1 Ethane 25.5 46.0 45.5 Metals 114.8 107.6 134.5 Total notional $ 207.5 $ 261.2 $ 272.1
Summary of location and fair value of derivative instruments on condensed balance sheets	The following table summarizes the location and fair value of the derivative instruments on our condensed balance sheets. The table disaggregates our net derivative assets and liabilities into gross components on a contract-by-contract basis before giving effect to master netting arrangements: September 30, 2023 December 31, 2022 September 30, 2022 ($ in millions) Asset derivatives: Other current assets Derivatives designated as hedging instruments: Commodity contracts - gains $ 1.7 $ 2.4 $ 15.1 Commodity contracts - losses (0.4) (0.9) (1.5) Derivatives not designated as hedging instruments: Foreign exchange contracts - gains 1.2 0.3 1.3 Foreign exchange contracts - losses (0.1) — (0.2) Total other current assets 2.4 1.8 14.7 Other assets Derivatives designated as hedging instruments: Commodity contracts - gains 3.2 4.0 3.8 Commodity contracts - losses — — (0.1) Total other assets 3.2 4.0 3.7 Total asset derivatives (1) $ 5.6 $ 5.8 $ 18.4 Liability derivatives: Accrued liabilities Derivatives designated as hedging instruments: Commodity contracts - losses $ 19.3 $ 43.3 $ 34.7 Commodity contracts - gains (1.5) (1.7) (6.8) Derivatives not designated as hedging instruments: Foreign exchange contracts - losses — 1.7 5.3 Foreign exchange contracts - gains — (0.8) (1.8) Total accrued liabilities 17.8 42.5 31.4 Other liabilities Derivatives designated as hedging instruments: Commodity contracts - losses 2.5 8.0 2.6 Commodity contracts - gains (0.3) (0.6) — Total other liabilities 2.2 7.4 2.6 Total liability derivatives (1) $ 20.0 $ 49.9 $ 34.0 (1) Does not include the impact of cash collateral received from or provided to counterparties.
Summary of effects of derivative instruments on condensed statements of income	The following table summarizes the effects of derivative instruments on our condensed statements of operations: Amount of Gain (Loss) Three Months Ended September 30, Nine Months Ended September 30, Location of Gain (Loss) 2023 2022 2023 2022 Derivatives – Cash Flow Hedges ($ in millions) Recognized in other comprehensive loss: Commodity contracts ——— $ (1.9) $ 6.6 $ (33.4) $ 23.0 Reclassified from accumulated other comprehensive loss into income: Commodity contracts Cost of goods sold $ (10.2) $ 17.8 $ (61.4) $ 66.3 Derivatives Not Designated as Hedging Instruments Commodity contracts Cost of goods sold $ — $ — $ (0.6) $ 0.5 Foreign exchange contracts Selling and administration $ 3.6 $ (15.6) $ (9.6) $ (42.7)

FAIR VALUE MEASUREMENTS (Tables

FAIR VALUE MEASUREMENTS (Tables)	9 Months Ended
FAIR VALUE MEASUREMENTS (Tables)	Sep. 30, 2023
Fair Value Disclosures [Abstract]
Table of financial instruments measured at fair value	The following table summarizes the assets and liabilities measured at fair value in the condensed balance sheets: Fair Value Measurements Balance at September 30, 2023 Level 1 Level 2 Level 3 Total Assets ($ in millions) Commodity contracts $ — $ 4.5 $ — $ 4.5 Foreign exchange contracts — 1.1 — 1.1 Total Assets $ — $ 5.6 $ — $ 5.6 Liabilities Commodity contracts $ — $ 20.0 $ — $ 20.0 Total Liabilities $ — $ 20.0 $ — $ 20.0 Balance at December 31, 2022 Assets Commodity contracts $ — $ 5.5 $ — $ 5.5 Foreign exchange contracts — 0.3 — 0.3 Total Assets $ — $ 5.8 $ — $ 5.8 Liabilities Commodity contracts $ — $ 49.0 $ — $ 49.0 Foreign exchange contracts — 0.9 — 0.9 Total Liabilities $ — $ 49.9 $ — $ 49.9 Balance at September 30, 2022 Assets Commodity contracts $ — $ 17.3 $ — $ 17.3 Foreign exchange contracts — 1.1 — 1.1 Total Assets $ — $ 18.4 $ — $ 18.4 Liabilities Commodity contracts $ — $ 30.5 $ — $ 30.5 Foreign exchange contracts — 3.5 — 3.5 Total Liabilities $ — $ 34.0 $ — $ 34.0

RESTRUCTURING CHARGES (Details

RESTRUCTURING CHARGES (Details 1) $ in Millions	3 Months Ended						9 Months Ended		31 Months Ended	32 Months Ended	46 Months Ended	90 Months Ended
RESTRUCTURING CHARGES (Details 1) $ in Millions	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2023 USD ($)	Oct. 21, 2021 T	Dec. 11, 2019 T	Mar. 21, 2016 T
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 11.9	$ 19.2	$ 60.9	$ 7.6	$ 3.6	$ 3.1	$ 92	$ 14.3				$ 388.6
Inception to date Amounts Utilized (cash)												184.5
Inception to date Amounts Utilized (non-cash)												158
Epoxy Optimization Plan \| Epoxy
Restructuring Cost and Reserve [Line Items]
Restructuring charges	8.6						79.7					87.7
Additional restructuring and related expected cost	45						45		$ 45	$ 45	$ 45	45
McIntosh Plan \| Chlor Alkali Products and Vinyls
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.7			5.5			4.6	7.1	18.5
Additional restructuring and related expected cost	25						25		25	25	25	25
McIntosh Restructuring Capacity Reduction \| T													400,000
Freeport 2021 Plan \| Chlor Alkali Products and Vinyls
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.7			0.4			2.8	1.9		11.9
Additional restructuring and related expected cost	15						15		15	15	15	15
Freeport 2019 Plan \| Chlor Alkali Products and Vinyls
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1.9			$ 1.7			4.9	4.9			77.5
Additional restructuring and related expected cost	25						25		25	25	25	25
Freeport Chlor Alkali Capacity Reduction \| T														230,000
Chlor Alkali 2016 Plan \| Chlor Alkali Products and Vinyls
Restructuring Cost and Reserve [Line Items]
Restructuring charges								$ 0.4				182.7
Additional restructuring and related expected cost	$ 0						$ 0		$ 0	$ 0	$ 0	$ 0
Total Product Segment Production Capacity Decrease \| T															433,000

RESTRUCTURING CHARGES (Detail_2

RESTRUCTURING CHARGES (Details 2) - USD ($) $ in Millions	3 Months Ended						9 Months Ended		90 Months Ended
RESTRUCTURING CHARGES (Details 2) - USD ($) $ in Millions	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Dec. 31, 2022	Dec. 31, 2021
Restructuring Cost and Reserve [Line Items]
Accrued restructuring costs	$ 46.1			$ 7			$ 46.1	$ 7	$ 46.1	$ 13.6	$ 12.3
Restructuring charges	11.9	$ 19.2	$ 60.9	7.6	$ 3.6	$ 3.1	92	14.3	388.6
Amounts utilized							(59.5)	(19.6)
Employee severance and related benefit costs
Restructuring Cost and Reserve [Line Items]
Accrued restructuring costs	11.9			2.6			11.9	2.6	11.9	9.4	6.9
Restructuring charges	2.6	3.3	0	0	0	0			32.4
Amounts utilized							(3.4)	(4.3)
Lease and other contract termination costs
Restructuring Cost and Reserve [Line Items]
Accrued restructuring costs	34.2			4.4			34.2	4.4	34.2	4.2	5.4
Restructuring charges	2	1.7	39.7	0	0.2	0.1			92.8
Amounts utilized							(13.4)	(1.3)
Facility exit costs
Restructuring Cost and Reserve [Line Items]
Accrued restructuring costs	0			0			0	0	0	0	0
Restructuring charges	7.3	9.3	8.4	4.9	3.1	2.6			103.7
Amounts utilized							(25)	(10.6)
Write-off of equipment and facility
Restructuring Cost and Reserve [Line Items]
Accrued restructuring costs	0			0			0	0	0	$ 0	$ 0
Restructuring charges	$ 0	$ 4.9	$ 12.8	$ 2.7	$ 0.3	$ 0.4			$ 158
Amounts utilized							$ (17.7)	$ (3.4)

RESTRUCTURING CHARGES (Detail_3

RESTRUCTURING CHARGES (Details 3) - USD ($) $ in Millions

3 Months Ended

9 Months Ended

30 Months Ended

31 Months Ended

32 Months Ended

46 Months Ended

90 Months Ended

Sep. 30, 2023

Jun. 30, 2023

Mar. 31, 2023

Sep. 30, 2022

Jun. 30, 2022

Mar. 31, 2022

Sep. 30, 2023

Sep. 30, 2022

Sep. 30, 2023

Restructuring Cost and Reserve [Line Items]

Restructuring charges

$ 11.9

$ 19.2

$ 60.9

$ 7.6

$ 3.6

$ 3.1

$ 92

$ 14.3

$ 388.6

Write-off of equipment and facility

Restructuring Cost and Reserve [Line Items]

Restructuring charges

4.9

12.8

2.7

0.3

0.4

158

Employee severance and related benefit costs

Restructuring Cost and Reserve [Line Items]

Restructuring charges

2.6

3.3

32.4

Facility exit costs

Restructuring Cost and Reserve [Line Items]

Restructuring charges

7.3

9.3

8.4

4.9

3.1

2.6

103.7

Employee relocation costs

Restructuring Cost and Reserve [Line Items]

Restructuring charges

1.7

Lease and other contract termination costs

Restructuring Cost and Reserve [Line Items]

Restructuring charges

$ 1.7

$ 39.7

$ 0.2

$ 0.1

92.8

McIntosh Plan | Chlor Alkali Products and Vinyls

Restructuring Cost and Reserve [Line Items]

Restructuring charges

0.7

5.5

4.6

7.1

$ 18.5

McIntosh Plan | Chlor Alkali Products and Vinyls | Write-off of equipment and facility

Restructuring Cost and Reserve [Line Items]

Restructuring charges

2.7

McIntosh Plan | Chlor Alkali Products and Vinyls | Employee severance and related benefit costs

Restructuring Cost and Reserve [Line Items]

Restructuring charges

McIntosh Plan | Chlor Alkali Products and Vinyls | Facility exit costs

Restructuring Cost and Reserve [Line Items]

Restructuring charges

9.4

McIntosh Plan | Chlor Alkali Products and Vinyls | Employee relocation costs

Restructuring Cost and Reserve [Line Items]

Restructuring charges

McIntosh Plan | Chlor Alkali Products and Vinyls | Lease and other contract termination costs

Restructuring Cost and Reserve [Line Items]

Restructuring charges

$ 6.4

Freeport 2021 Plan | Chlor Alkali Products and Vinyls

Restructuring Cost and Reserve [Line Items]

Restructuring charges

0.7

0.4

2.8

1.9

$ 11.9

Freeport 2021 Plan | Chlor Alkali Products and Vinyls | Write-off of equipment and facility

Restructuring Cost and Reserve [Line Items]

Restructuring charges

Freeport 2021 Plan | Chlor Alkali Products and Vinyls | Employee severance and related benefit costs

Restructuring Cost and Reserve [Line Items]

Restructuring charges

Freeport 2021 Plan | Chlor Alkali Products and Vinyls | Facility exit costs

Restructuring Cost and Reserve [Line Items]

Restructuring charges

11.9

Freeport 2021 Plan | Chlor Alkali Products and Vinyls | Employee relocation costs

Restructuring Cost and Reserve [Line Items]

Restructuring charges

Freeport 2021 Plan | Chlor Alkali Products and Vinyls | Lease and other contract termination costs

Restructuring Cost and Reserve [Line Items]

Restructuring charges

$ 0

Freeport 2019 Plan | Chlor Alkali Products and Vinyls

Restructuring Cost and Reserve [Line Items]

Restructuring charges

1.9

$ 1.7

4.9

$ 77.5

Freeport 2019 Plan | Chlor Alkali Products and Vinyls | Write-off of equipment and facility

Restructuring Cost and Reserve [Line Items]

Restructuring charges

58.9

Freeport 2019 Plan | Chlor Alkali Products and Vinyls | Employee severance and related benefit costs

Restructuring Cost and Reserve [Line Items]

Restructuring charges

2.1

Freeport 2019 Plan | Chlor Alkali Products and Vinyls | Facility exit costs

Restructuring Cost and Reserve [Line Items]

Restructuring charges

16.5

Freeport 2019 Plan | Chlor Alkali Products and Vinyls | Employee relocation costs

Restructuring Cost and Reserve [Line Items]

Restructuring charges

Freeport 2019 Plan | Chlor Alkali Products and Vinyls | Lease and other contract termination costs

Restructuring Cost and Reserve [Line Items]

Restructuring charges

$ 0

Chlor Alkali 2016 Plan | Chlor Alkali Products and Vinyls

Restructuring Cost and Reserve [Line Items]

Restructuring charges

$ 0.4

182.7

Chlor Alkali 2016 Plan | Chlor Alkali Products and Vinyls | Write-off of equipment and facility

Restructuring Cost and Reserve [Line Items]

Restructuring charges

78.1

Chlor Alkali 2016 Plan | Chlor Alkali Products and Vinyls | Employee severance and related benefit costs

Restructuring Cost and Reserve [Line Items]

Restructuring charges

6.7

Chlor Alkali 2016 Plan | Chlor Alkali Products and Vinyls | Facility exit costs

Restructuring Cost and Reserve [Line Items]

Restructuring charges

53.2

Chlor Alkali 2016 Plan | Chlor Alkali Products and Vinyls | Employee relocation costs

Restructuring Cost and Reserve [Line Items]

Restructuring charges

1.7

Chlor Alkali 2016 Plan | Chlor Alkali Products and Vinyls | Lease and other contract termination costs

Restructuring Cost and Reserve [Line Items]

Restructuring charges

Epoxy Optimization Plan | Epoxy

Restructuring Cost and Reserve [Line Items]

Restructuring charges

$ 8.6

$ 79.7

87.7

Epoxy Optimization Plan | Epoxy | Write-off of equipment and facility

Restructuring Cost and Reserve [Line Items]

Restructuring charges

18.3

Epoxy Optimization Plan | Epoxy | Employee severance and related benefit costs

Restructuring Cost and Reserve [Line Items]

Restructuring charges

13.3

Epoxy Optimization Plan | Epoxy | Facility exit costs

Restructuring Cost and Reserve [Line Items]

Restructuring charges

12.7

Epoxy Optimization Plan | Epoxy | Employee relocation costs

Restructuring Cost and Reserve [Line Items]

Restructuring charges

Epoxy Optimization Plan | Epoxy | Lease and other contract termination costs

Restructuring Cost and Reserve [Line Items]

Restructuring charges

$ 43.4

Productivity Plan | Corporate/other

Restructuring Cost and Reserve [Line Items]

Restructuring charges

$ 10.3

Productivity Plan | Corporate/other | Write-off of equipment and facility

Restructuring Cost and Reserve [Line Items]

Restructuring charges

Productivity Plan | Corporate/other | Employee severance and related benefit costs

Restructuring Cost and Reserve [Line Items]

Restructuring charges

10.3

Productivity Plan | Corporate/other | Facility exit costs

Restructuring Cost and Reserve [Line Items]

Restructuring charges

Productivity Plan | Corporate/other | Employee relocation costs

Restructuring Cost and Reserve [Line Items]

Restructuring charges

Productivity Plan | Corporate/other | Lease and other contract termination costs

Restructuring Cost and Reserve [Line Items]

Restructuring charges

$ 0

EARNINGS PER SHARE (Details)

EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Net income	$ 104.5	$ 315.2	$ 403.2	$ 1,130.3
Net income (loss) attributable to noncontrolling interests	0.4	0	(4.1)	0
Net income attributable to Olin Corporation	$ 104.1	$ 315.2	$ 407.3	$ 1,130.3
Basic shares	124.2	141.2	127.5	148.3
Basic net income attributable to Olin Corporation per share	$ 0.84	$ 2.23	$ 3.19	$ 7.62
Earnings Per Share, Diluted [Abstract]
Basic shares	124.2	141.2	127.5	148.3
Stock-based compensation	2.8	3.1	3.1	3.6
Diluted shares	127	144.3	130.6	151.9
Diluted net income attributable to Olin Corporation per share	$ 0.82	$ 2.18	$ 3.12	$ 7.44
Antidilutive Securities Excluded from Computation of Earnings Per Share, Shares	1.3	0.7	1.3	0.7

ACCOUNTS RECEIVABLES (Details)

ACCOUNTS RECEIVABLES (Details) € in Millions, $ in Millions	3 Months Ended		9 Months Ended
ACCOUNTS RECEIVABLES (Details) € in Millions, $ in Millions	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 EUR (€)	Dec. 31, 2022 USD ($)	Oct. 11, 2022 USD ($)	Dec. 31, 2021 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022 Senior Credit Facility	$ 1,550		$ 1,550
AR Facilities, Amount Outstanding to be Serviced	72.7	$ 91.3	72.7	$ 91.3		$ 111.8		$ 83.3
AR Facilities, Gross receivables sold			749.5	769.3
AR Facilities, Payments received from customers on sold accounts			(788.6)	(761.3)
AR Facilities, Interest Expense	1.3	0.9	3.8	1.8
AR Facilities, Recourse Liability	0	0	0	0		0
Allowance for Doubtful Accounts	12.8	12.5	12.8	12.5		12.6
Other Receivables	78	58	78	58		71.6
United States
Accounts, Notes, Loans and Financing Receivable [Line Items]
AR Facilities, Maximum Outstanding Sales	175.5		175.5
Foreign
Accounts, Notes, Loans and Financing Receivable [Line Items]
AR Facilities, Maximum Outstanding Sales \| €					€ 22
Receivables Financing Agreement
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables Financing Agreement Maximum Borrowing Capacity							$ 425
Receivables Financing Agreement Outstanding Balance	350	$ 300	350	$ 300		$ 300
Trade Receivables Pledged as Collateral for Secured Borrowings	489.4		489.4
Receivables Financing Agreement Available Borrowing Capacity	$ 7.2		$ 7.2

INVENTORIES (Details)

INVENTORIES (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Inventory Disclosure [Abstract]
Supplies	$ 150.3	$ 137.6	$ 137.2
Raw materials	178.3	201.2	203.4
Work in process	188.4	199.6	189.6
Finished goods	615.5	559.3	569.2
Inventories excluding LIFO reserve	1,132.5	1,097.7	1,099.4
LIFO reserve	(154.8)	(155.8)	(154.3)
Inventories, net	$ 977.7	$ 941.9	$ 945.1

OTHER ASSETS (Details)

OTHER ASSETS (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
OTHER ASSETS (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Other Assets [Abstract]
Supply contracts	$ 1,060.6	$ 1,013.8	$ 1,060.6	$ 1,013.8	$ 1,048
Other	56.7	76.9	56.7	76.9	54.5
Other assets	1,117.3	1,090.7	1,117.3	1,090.7	$ 1,102.5
Amortization of Supply Contracts	$ 17.8	$ 17.6	$ 53.4	$ 52.8

GOODWILL AND INTANGIBLE ASSET_2

GOODWILL AND INTANGIBLE ASSETS (Details 1) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Line Items]
Goodwill	$ 1,421	$ 1,421.2	$ 1,420.9	$ 1,420.6
Goodwill, Foreign Currency Translation Gain (Loss)	0.1	0.6
Chlor Alkali Products and Vinyls
Goodwill [Line Items]
Goodwill	1,275.9	1,276.1	1,275.8	1,275.6
Goodwill, Foreign Currency Translation Gain (Loss)	0.1	0.5
Epoxy
Goodwill [Line Items]
Goodwill	145.1	145.1	$ 145.1	$ 145
Goodwill, Foreign Currency Translation Gain (Loss)	$ 0	$ 0.1

GOODWILL AND INTANGIBLE ASSET_3

GOODWILL AND INTANGIBLE ASSETS (Details 2) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Assets, Gross	$ 765.5	$ 764	$ 755.7
Finite-Lived Intangible Assets, Accumulated Amortization	(516.9)	(490.2)	(476.5)
Finite-Lived Intangible Assets, Net	248.6	273.8	279.2
Customers, customer contracts and relationships
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Assets, Gross	668	669.1	662
Finite-Lived Intangible Assets, Accumulated Amortization	(426.8)	(401.2)	(389.3)
Finite-Lived Intangible Assets, Net	241.2	267.9	272.7
Acquired technology
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Assets, Gross	92.8	93.1	91.9
Finite-Lived Intangible Assets, Accumulated Amortization	(89.4)	(88.3)	(86.5)
Finite-Lived Intangible Assets, Net	3.4	4.8	5.4
Other
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Assets, Gross	4.7	1.8	1.8
Finite-Lived Intangible Assets, Accumulated Amortization	(0.7)	(0.7)	(0.7)
Finite-Lived Intangible Assets, Net	$ 4	$ 1.1	$ 1.1

DEBT (Details 1)

DEBT (Details 1) - USD ($) $ in Millions		9 Months Ended
DEBT (Details 1) - USD ($) $ in Millions	Oct. 11, 2022	Sep. 30, 2023	Sep. 30, 2022	Feb. 24, 2021
Debt Instrument [Line Items]
Proceeds from Issuance of Debt		$ 587.7	$ 215
Long-term Debt Repayments		(381.1)	(415.9)
Proceeds from (Repayments of) Debt		206.6	(200.9)
2022 Senior Credit Facility		1,550
Quarterly Required Principal Payment Percent Through 2024	0.625%
Quarterly Required Principal Payment Percent After 2024	1.25%
Senior Revolving Credit Facility
Debt Instrument [Line Items]
Proceeds from Issuance of Debt		255	170
Long-term Debt Repayments		(90)	(170)
Receivables Financing Agreement
Debt Instrument [Line Items]
Proceeds from Issuance of Debt		332.7	45
Long-term Debt Repayments		(282.7)	(45)
$550 Senior Notes Due
Debt Instrument [Line Items]
Long-term Debt Repayments		0	(200)
Senior Term Loan
Debt Instrument [Line Items]
Long-term Debt Repayments		(6.6)	0
Finance Leases
Debt Instrument [Line Items]
Long-term Debt Repayments		(1.8)	$ (0.9)
$1,550.0 Million Secured Credit Facility
Debt Instrument [Line Items]
2022 Senior Credit Facility	$ 1,550
350.0 Million Term Loan Facility
Debt Instrument [Line Items]
Term Loan Facility, Maximum Borrowing Capacity	350
$800.0 million Senior Revolving Credit Facility
Debt Instrument [Line Items]
Senior Revolving Credit Facility, Maximum Borrowing Capacity				$ 800
$1,200.0 million Senior Revolving Credit Facility
Debt Instrument [Line Items]
Senior Revolving Credit Facility, Maximum Borrowing Capacity	$ 1,200
Letters of Credit Outstanding, Amount		100
Senior Revolving Credit Facility, Remaining Borrowing Capacity		1,034.6
Amount Borrowed Under Senior Revolving Credit Facility
Debt Instrument [Line Items]
Proceeds from Issuance of Debt		165
Letters of Credit Issued Under Senior Revolving Credit Facility
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount		$ 0.4

PENSION PLANS AND RETIREMENT _3

PENSION PLANS AND RETIREMENT BENEFITS (Details 1) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 1.4	$ 2	$ 4.2	$ 6.5
Interest cost	26.4	15.1	79.1	46
Expected return on plans’ assets	(32.9)	(34.3)	(98.5)	(102.8)
Amortization of prior service cost	(0.1)	0	(0.3)	(0.4)
Recognized actuarial loss	0.3	9	0.9	26.2
Net periodic benefit (income) cost	(4.9)	(8.2)	(14.6)	(24.5)
Other Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0.1	0.2	0.5	0.8
Interest cost	0.4	0.2	1.3	0.8
Expected return on plans’ assets	0	0	0	0
Amortization of prior service cost	0	0	0.1	0.1
Recognized actuarial loss	0	0.1	0.4	1.1
Net periodic benefit (income) cost	$ 0.5	$ 0.5	2.3	2.8
Qualified Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer			$ 1.6	$ 0.9

PENSION PLANS AND RETIREMENT _4

PENSION PLANS AND RETIREMENT BENEFITS (Details 2) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Pension Benefits
Service cost	$ 1.4	$ 2	$ 4.2	$ 6.5
Interest cost	26.4	15.1	79.1	46
Expected return on plans’ assets	(32.9)	(34.3)	(98.5)	(102.8)
Amortization of prior service cost	(0.1)	0	(0.3)	(0.4)
Recognized actuarial loss	0.3	9	0.9	26.2
Net periodic benefit (income) cost	(4.9)	(8.2)	(14.6)	(24.5)
Other Postretirement Benefits
Service cost	0.1	0.2	0.5	0.8
Interest cost	0.4	0.2	1.3	0.8
Expected return on plans’ assets	0	0	0	0
Amortization of prior service cost	0	0	0.1	0.1
Recognized actuarial loss	0	0.1	0.4	1.1
Net periodic benefit (income) cost	$ 0.5	$ 0.5	$ 2.3	$ 2.8

INCOME TAXES (Details 1)

INCOME TAXES (Details 1) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
INCOME TAXES (Details 1) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Effective Tax Rate, Discrete Items, net benefit (expense)	$ 7.2	$ 36.6	$ 24.4	$ 47.5
Effective Tax Rate, Discrete Items, net Percent	23.20%	24.30%	24.10%	24.40%
Statutory Federal Tax Rate	21%	21%	21%	21%
Impact on the effective tax rate, if recognized	$ 58.4	$ 44.7	$ 58.4	$ 44.7
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Balance at beginning of year			51.6	43.4
Increases for prior year tax positions			1.3	0.3
Decreases for prior year tax positions			(0.3)	(0.7)
Increases for current year tax positions			10.1	5.9
Foreign currency translation adjustments			(0.6)	(4.1)
Balance at end of period	62.1	$ 44.8	62.1	$ 44.8
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	$ 48.9		$ 48.9

INCOME TAXES (Details 2)

INCOME TAXES (Details 2)	9 Months Ended
INCOME TAXES (Details 2)	Sep. 30, 2023
United States \| Internal Revenue Service (IRS) \| Minimum
Income Tax Examination [Line Items]
Open Tax Year	2018
United States \| Internal Revenue Service (IRS) \| Maximum
Income Tax Examination [Line Items]
Open Tax Year	2022
United States \| State and Local Jurisdiction \| Minimum
Income Tax Examination [Line Items]
Open Tax Year	2012
United States \| State and Local Jurisdiction \| Maximum
Income Tax Examination [Line Items]
Open Tax Year	2022
Canada \| Foreign Country \| Minimum
Income Tax Examination [Line Items]
Open Tax Year	2016
Canada \| Foreign Country \| Maximum
Income Tax Examination [Line Items]
Open Tax Year	2022
Brazil \| Foreign Country \| Minimum
Income Tax Examination [Line Items]
Open Tax Year	2016
Brazil \| Foreign Country \| Maximum
Income Tax Examination [Line Items]
Open Tax Year	2022
Germany \| Foreign Country \| Minimum
Income Tax Examination [Line Items]
Open Tax Year	2015
Germany \| Foreign Country \| Maximum
Income Tax Examination [Line Items]
Open Tax Year	2022
China \| Foreign Country \| Minimum
Income Tax Examination [Line Items]
Open Tax Year	2014
China \| Foreign Country \| Maximum
Income Tax Examination [Line Items]
Open Tax Year	2022
The Netherlands \| Foreign Country \| Minimum
Income Tax Examination [Line Items]
Open Tax Year	2016
The Netherlands \| Foreign Country \| Maximum
Income Tax Examination [Line Items]
Open Tax Year	2022

CONTRIBUTING EMPLOYEE OWNERSH_2

CONTRIBUTING EMPLOYEE OWNERSHIP PLAN (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Defined Contribution Plan Disclosure [Line Items]
Defined Contribution Plan Employer Contribution of Eligible Compensation	$ 8.4	$ 9.6	$ 28.6	$ 28.9
Employer matching contributions to employee ownership plan	$ 3.6	$ 4	$ 11	$ 10.8
Minimum
Defined Contribution Plan Disclosure [Line Items]
Contribution To Individual Retirement Account Percentage Of Employees Eligible Compensation	5%		5%
Maximum
Defined Contribution Plan Disclosure [Line Items]
Contribution To Individual Retirement Account Percentage Of Employees Eligible Compensation	7.50%		7.50%

STOCK-BASED COMPENSATION (Detai

STOCK-BASED COMPENSATION (Details 1) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Share-Based Payment Arrangement [Abstract]
Stock-based compensation	$ 6.7	$ 5.8	$ 19.5	$ 20
Mark-to-market adjustments	(2.3)	(2)	(2.4)	(10.5)
Total expense	$ 4.4	$ 3.8	$ 17.1	$ 9.5

STOCK-BASED COMPENSATION (Det_2

STOCK-BASED COMPENSATION (Details 2) - USD ($)	9 Months Ended
STOCK-BASED COMPENSATION (Details 2) - USD ($)	Sep. 30, 2023	Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance Share Award, Total Shareholder Return Percent	50%
Performance Share Award Cycle	3
Performance Share Award, Net Income Percent	50%
Black-Sholes Option-Pricing Model
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	1.32%	1.60%
Risk-free interest rate	4.07%	1.93%
Expected volatility of Olin common stock	47%	48%
Expected life (years)	7 years	7 years
Weighted-average grant fair value (per option)	$ 28.74	$ 21.18
Weighted-average exercise price	$ 60.55	$ 49.71
Options granted	562,124	742,100
Monte Carlo Simulation Model
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	4.46%	1.74%
Expected volatility of Olin common stock	52%	59%
Expected life (years)	3 years	3 years
Expected average volatility of peer companies	0.42	0.47
Average correlation coefficient of peer companies	0.51	0.51
Grant date fair value (TSR based award)	$ 86.98	$ 64.13
Grant date fair value (net income based award)	$ 60.55	$ 49.71
Awards granted	161,474	184,000

SHAREHOLDERS' EQUITY (Details)

SHAREHOLDERS' EQUITY (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
SHAREHOLDERS' EQUITY (Details) - USD ($) $ in Millions	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Jul. 28, 2022
Equity, Class of Treasury Stock [Line Items]
Stock Repurchased and Retired During Period, Value							$ 595.1	$ 1,100.6
Stock options exercised, Shares							800,000	900,000
Stock options exercised, Value							$ 22.3	$ 21.3
Foreign Currency Translation Adjustment
Beginning balance			$ (38.6)			$ (10.9)	(38.6)	(10.9)
Unrealized (losses) gains	$ (3.3)	$ (8.5)	5.5	$ (25.1)	$ (26)	(10.5)
Reclassification adjustments of losses (gains) into income	0	0	0	0	0	0
Tax benefit (provision)	0	0	0	0	0	0
Net change							(6.3)	(61.6)
Ending Balance	(44.9)			(72.5)			(44.9)	(72.5)
Gains (Losses) on Derivative Contracts (net of taxes)
Beginning balance			(32.5)			22.8	(32.5)	22.8
Unrealized (losses) gains	(1.9)	(10.7)	(20.8)	6.6	(36.4)	52.8
Reclassification adjustments of losses (gains) into income	10.2	20.5	30.7	(17.8)	(36.1)	(12.4)
Tax benefit (provision)	(2.1)	(2.4)	(2.5)	2.5	17.5	(9.7)
Net change	6.2			(8.7)			21	(33)
Ending balance	(11.5)			(10.2)			(11.5)	(10.2)
Pension and Other Postretirement Benefits (net of taxes)
Beginning balance			(424.8)			(499.9)	(424.8)	(499.9)
Unrealized (losses) gains	0	0	0	0	0	0
Reclassification adjustments of losses (gains) into income	0.2	0.5	0.4	9.1	9	8.9
Tax benefit (provision)	0	(0.1)	(0.1)	(2.1)	(2.3)	(2.3)
Net change							0.9	20.3
Ending balance	(423.9)			(479.6)			(423.9)	(479.6)
Accumulated Other Comprehensive Loss
Beginning balance			(495.9)			(488)	(495.9)	(488)
Unrealized (losses) gains	(5.2)	(19.2)	(15.3)	(18.5)	(62.4)	42.3
Reclassification adjustments of losses (gains) into income	10.4	21	31.1	(8.7)	(27.1)	(3.5)
Tax benefit (provision)	(2.1)	$ (2.5)	$ (2.6)	0.4	$ 15.2	$ (12)
Net change							15.6	(74.3)
Ending balance	(480.3)			$ (562.3)			$ (480.3)	$ (562.3)
Common Stock
Equity, Class of Treasury Stock [Line Items]
Stock Repurchased and Retired During Period, Shares							10,800,000	20,800,000
Common Stock \| 2022 Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Authorized share repurchase program (in dollars)									$ 2,000
Stock Repurchased and Retired During Period, Shares							16,700,000
Stock Repurchased and Retired During Period, Value							$ 887.9
Remaining authorized repurchase amount (in dollars)	$ 1,112.1						$ 1,112.1

SEGMENT INFORMATION (Details 1)

SEGMENT INFORMATION (Details 1) - USD ($) $ in Millions	3 Months Ended						9 Months Ended		90 Months Ended
SEGMENT INFORMATION (Details 1) - USD ($) $ in Millions	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023
Sales [Abstract]
Sales	$ 1,671.4			$ 2,321.7			$ 5,218.4	$ 7,399.2
Income (loss) before taxes:
Income (loss) before taxes	126.7			367.9			499.4	1,432.2
Corporate/Other:
Environmental expense	6.9			7.4			23.1	18
Restructuring charges	(11.9)	$ (19.2)	$ (60.9)	(7.6)	$ (3.6)	$ (3.1)	(92)	(14.3)	$ (388.6)
Other operating (expense) income	(0.3)			13			27.2	16.3
Interest expense	(46.2)			(36)			(133.9)	(103.4)
Interest income	1			0.5			3.2	1.2
Non-operating pension income	5.9			9.9			17	29
Gain on the sale of domestic private trucking fleet and operations
Corporate/Other:
Other operating (expense) income							27
Gain for the sale of two former manufacturing facilities
Corporate/Other:
Other operating (expense) income								13
Corporate/other
Corporate/Other:
Environmental expense	6.9			7.4			23.1	18
Other corporate and unallocated costs	(22.9)			(27.5)			(79.6)	(92.8)
Restructuring charges	(11.9)			(7.6)			(92)	(14.3)
Chlor Alkali Products and Vinyls
Sales [Abstract]
Sales	969.6			1,263.5			3,089	3,912.2
Income (loss) before taxes:
Income (loss) before taxes	172.3			253.9			598.3	929
Epoxy
Sales [Abstract]
Sales	321.6			644.1			1,016.1	2,206.3
Income (loss) before taxes:
Income (loss) before taxes	(28.8)			80.1			(7.9)	358
Winchester
Sales [Abstract]
Sales	380.2			414.1			1,113.3	1,280.7
Income (loss) before taxes:
Income (loss) before taxes	$ 64.5			$ 89			$ 190.2	$ 327.2

SEGMENT INFORMATION (Details 2)

SEGMENT INFORMATION (Details 2) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
SEGMENT INFORMATION (Details 2) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Sales	$ 1,671.4	$ 2,321.7	$ 5,218.4	$ 7,399.2
United States
Disaggregation of Revenue [Line Items]
Sales	1,110.1	1,449	3,484.5	4,513.6
Europe
Disaggregation of Revenue [Line Items]
Sales	162.5	368.7	477.5	1,254.4
Other foreign
Disaggregation of Revenue [Line Items]
Sales	398.8	504	1,256.4	1,631.2
Chlor Alkali Products and Vinyls
Disaggregation of Revenue [Line Items]
Sales	969.6	1,263.5	3,089	3,912.2
Chlor Alkali Products and Vinyls \| United States
Disaggregation of Revenue [Line Items]
Sales	651	870.8	2,069.8	2,636.6
Chlor Alkali Products and Vinyls \| Europe
Disaggregation of Revenue [Line Items]
Sales	57.9	80.9	175.3	233.7
Chlor Alkali Products and Vinyls \| Other foreign
Disaggregation of Revenue [Line Items]
Sales	260.7	311.8	843.9	1,041.9
Epoxy
Disaggregation of Revenue [Line Items]
Sales	321.6	644.1	1,016.1	2,206.3
Epoxy \| United States
Disaggregation of Revenue [Line Items]
Sales	131.4	201	431.8	696.7
Epoxy \| Europe
Disaggregation of Revenue [Line Items]
Sales	84.8	280.3	258.8	993.7
Epoxy \| Other foreign
Disaggregation of Revenue [Line Items]
Sales	105.4	162.8	325.5	515.9
Winchester
Disaggregation of Revenue [Line Items]
Sales	380.2	414.1	1,113.3	1,280.7
Winchester \| United States
Disaggregation of Revenue [Line Items]
Sales	327.7	377.2	982.9	1,180.3
Winchester \| Europe
Disaggregation of Revenue [Line Items]
Sales	19.8	7.5	43.4	27
Winchester \| Other foreign
Disaggregation of Revenue [Line Items]
Sales	$ 32.7	$ 29.4	$ 87	$ 73.4

SEGMENT INFORMATION (Details 3)

SEGMENT INFORMATION (Details 3) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
SEGMENT INFORMATION (Details 3) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Sales	$ 1,671.4	$ 2,321.7	$ 5,218.4	$ 7,399.2
Chlor Alkali Products and Vinyls
Disaggregation of Revenue [Line Items]
Sales	969.6	1,263.5	3,089	3,912.2
Chlor Alkali Products and Vinyls \| Caustic soda
Disaggregation of Revenue [Line Items]
Sales	422.3	598.4	1,424	1,752.4
Chlor Alkali Products and Vinyls \| Chlorine, chlorine-derivatives and other co-products
Disaggregation of Revenue [Line Items]
Sales	547.3	665.1	1,665	2,159.8
Epoxy
Disaggregation of Revenue [Line Items]
Sales	321.6	644.1	1,016.1	2,206.3
Epoxy \| Aromatics and allylics
Disaggregation of Revenue [Line Items]
Sales	116.9	316.8	387.9	1,092.9
Epoxy \| Epoxy resins
Disaggregation of Revenue [Line Items]
Sales	204.7	327.3	628.2	1,113.4
Winchester
Disaggregation of Revenue [Line Items]
Sales	380.2	414.1	1,113.3	1,280.7
Winchester \| Commercial
Disaggregation of Revenue [Line Items]
Sales	181.2	271.6	581.1	906.4
Winchester \| Military and law enforcement
Disaggregation of Revenue [Line Items]
Sales	$ 199	$ 142.5	$ 532.2	$ 374.3

ENVIRONMENTAL (Details)

ENVIRONMENTAL (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
ENVIRONMENTAL (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Environmental Remediation Obligations [Abstract]
Reserves for future environmental expenditures - total	$ 153.5	$ 149.3	$ 153.5	$ 149.3	$ 146.6
Reserves for future environmental expenditures - noncurrent	128.5	124.3	128.5	124.3	$ 121.6
Environmental Remediation Expense	$ 6.9	$ 7.4	$ 23.1	$ 18

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Commitments and Contingencies Disclosure [Abstract]
Legal action accrued liabilities	$ 15.3	$ 14.4	$ 14.2

DERIVATIVE FINANCIAL INSTRUME_3

DERIVATIVE FINANCIAL INSTRUMENTS (Details Textuals) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Derivative [Line Items]
Notional amount	$ 207.5	$ 261.2	$ 272.1
Forward Contracts Buy
Derivative [Line Items]
Notional amount	5.3	275.8	273.6
Forward Contracts Sell
Derivative [Line Items]
Notional amount	155.2	$ 110.7	$ 96
Commodity Contract
Derivative [Line Items]
Cash Flow Hedges Derivative Instruments at Fair Value, Net	(15.5)
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	$ (12.6)

DERIVATIVE FINANCIAL INSTRUME_4

DERIVATIVE FINANCIAL INSTRUMENTS (Details 1) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Derivative [Line Items]
Notional amount	$ 207.5	$ 261.2	$ 272.1
Forward Contracts Buy
Derivative [Line Items]
Notional amount	5.3	275.8	273.6
Forward Contracts Sell
Derivative [Line Items]
Notional amount	155.2	110.7	96
Natural Gas Commodity Forward Contracts
Derivative [Line Items]
Notional amount	67.2	107.6	92.1
Ethane Commodity Forward Contracts
Derivative [Line Items]
Notional amount	25.5	46	45.5
Metals Commodity Forward Contracts
Derivative [Line Items]
Notional amount	$ 114.8	$ 107.6	$ 134.5

DERIVATIVE FINANCIAL INSTRUME_5

DERIVATIVE FINANCIAL INSTRUMENTS (Details 2) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Derivatives, Fair Value [Line Items]
Asset derivatives	$ (5.6)	$ (5.8)	$ (18.4)
Liability derivatives	(20)	(49.9)	(34)
Other Current Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	(2.4)	(1.8)	(14.7)
Other Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	(3.2)	(4)	(3.7)
Accrued Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	(17.8)	(42.5)	(31.4)
Other Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	(2.2)	(7.4)	(2.6)
Commodity Contracts Gains \| Designated as Hedging Instrument \| Other Current Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	(1.7)	(2.4)	(15.1)
Commodity Contracts Gains \| Designated as Hedging Instrument \| Other Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	(3.2)	(4)	(3.8)
Commodity Contracts Gains \| Designated as Hedging Instrument \| Accrued Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	1.5	1.7	6.8
Commodity Contracts Gains \| Designated as Hedging Instrument \| Other Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	0.3	0.6	0
Commodity Contracts Losses \| Designated as Hedging Instrument \| Other Current Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	0.4	0.9	1.5
Commodity Contracts Losses \| Designated as Hedging Instrument \| Other Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	0	0	0.1
Commodity Contracts Losses \| Designated as Hedging Instrument \| Accrued Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	(19.3)	(43.3)	(34.7)
Commodity Contracts Losses \| Designated as Hedging Instrument \| Other Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	(2.5)	(8)	(2.6)
Foreign Exchange Contract Gain \| Not Designated as Hedging Instrument \| Other Current Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	(1.2)	(0.3)	(1.3)
Foreign Exchange Contract Gain \| Not Designated as Hedging Instrument \| Accrued Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	0	0.8	1.8
Foreign Exchange Contract Loss \| Not Designated as Hedging Instrument \| Other Current Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	0.1	0	0.2
Foreign Exchange Contract Loss \| Not Designated as Hedging Instrument \| Accrued Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	$ 0	$ (1.7)	$ (5.3)

DERIVATIVE FINANCIAL INSTRUME_6

DERIVATIVE FINANCIAL INSTRUMENTS (Details 3) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Recognized in other comprehensive loss:	$ (1.9)	$ (10.7)	$ (20.8)	$ 6.6	$ (36.4)	$ 52.8
Commodity Contract \| Cost of goods sold \| Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss)	0			0			$ (0.6)	$ 0.5
Commodity Contract \| Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Recognized in other comprehensive loss:	(1.9)			6.6			(33.4)	23
Commodity Contract \| Cash Flow Hedging \| Cost of goods sold
Derivative Instruments, Gain (Loss) [Line Items]
Reclassified from accumulated other comprehensive loss into income:	(10.2)			17.8			(61.4)	66.3
Foreign Exchange Contract \| Selling and administration \| Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss)	$ 3.6			$ (15.6)			$ (9.6)	$ (42.7)

FAIR VALUE MEASUREMENTS (Detail

FAIR VALUE MEASUREMENTS (Details Textuals) - Nonrecurring - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	$ 0	$ 0	$ 0
Liabilities, Fair Value Disclosure	$ 0	$ 0	$ 0

FAIR VALUE MEASUREMENTS (Deta_2

FAIR VALUE MEASUREMENTS (Details 1) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	$ 5.6	$ 5.8	$ 18.4
Derivative Liability	20	49.9	34
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0	0	0
Derivative Liability	0	0	0
Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	5.6	5.8	18.4
Derivative Liability	20	49.9	34
Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0	0	0
Derivative Liability	0	0	0
Commodity Contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	4.5	5.5	17.3
Derivative Liability	20	49	30.5
Commodity Contract \| Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0	0	0
Derivative Liability	0	0	0
Commodity Contract \| Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	4.5	5.5	17.3
Derivative Liability	20	49	30.5
Commodity Contract \| Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0	0	0
Derivative Liability	0	0	0
Foreign Exchange Contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	1.1	0.3	1.1
Derivative Liability		0.9	3.5
Foreign Exchange Contract \| Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0	0	0
Derivative Liability		0	0
Foreign Exchange Contract \| Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	1.1	0.3	1.1
Derivative Liability		0.9	3.5
Foreign Exchange Contract \| Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	$ 0	0	0
Derivative Liability		$ 0	$ 0

FAIR VALUE MEASUREMENTS (Deta_3

FAIR VALUE MEASUREMENTS (Details 2) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Fair Value, Inputs, Level 2
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Long-term Debt, Fair Value	$ 2,666.9	$ 2,517.7	$ 2,386.5

SUBSEQUENT EVENT (Details)

SUBSEQUENT EVENT (Details) $ in Millions	Oct. 01, 2023 USD ($)
Subsequent Event [Line Items]
Payments to Acquire Businesses, Gross	$ 63.7