Olin (OLN) 10-Q 25 Oct 24 2024 Q3 Quarterly report Financial data

Document And Entity Information

Document And Entity Information	9 Months Ended
	Sep. 30, 2024 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, 2024
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
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	116,596,499

Condensed Balance Sheets

Condensed Balance Sheets - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Current assets:
Cash and cash equivalents	$ 225.9	$ 170.3	$ 158.3
Receivables, net	863.2	874.7	894.2
Income taxes receivable	18.9	15.3	28
Inventories, net	827.7	858.8	977.7
Other current assets	66	54.1	42.8
Total current assets	2,001.7	1,973.2	2,101
Property, plant and equipment (less accumulated depreciation of $5,120.4, $4,826.4 and $4,724.6)	2,343.4	2,519.6	2,490.2
Operating lease assets, net	309.3	344.7	331
Deferred income taxes	90.4	87.4	106.1
Other assets	1,131.5	1,118.5	1,117.3
Intangible assets, net	218.3	245.8	248.6
Goodwill	1,423.7	1,424	1,421
Total assets	7,518.3	7,713.2	7,815.2
Current liabilities:
Current installments of long-term debt	123.9	78.8	78.9
Accounts payable	759.1	775.4	717.6
Income taxes payable	138.4	154.7	171.5
Current operating lease liabilities	65.4	69.3	68.3
Accrued liabilities	343.1	450	361
Total current liabilities	1,429.9	1,528.2	1,397.3
Long-term debt	2,765.6	2,591.3	2,711.2
Operating lease liabilities	250	283.1	270.4
Accrued pension liability	202.6	225.8	212.7
Deferred income taxes	445.9	476.2	500.7
Other liabilities	334.7	340.3	355.4
Total liabilities	5,428.7	5,444.9	5,447.7
Commitments and contingencies
Shareholders’ equity:
Common stock, $1.00 par value per share: authorized, 240.0 shares; issued and outstanding, 116.6, 120.2 and 122.5 shares	116.6	120.2	122.5
Additional paid-in capital	0	24.8	130.1
Accumulated other comprehensive loss	(466.2)	(496.3)	(480.3)
Retained earnings	2,406.3	2,583.7	2,555.2
Olin Corporation’s shareholders’ equity	2,056.7	2,232.4	2,327.5
Noncontrolling interests	32.9	35.9	40
Total equity	2,089.6	2,268.3	2,367.5
Total liabilities and equity	$ 7,518.3	$ 7,713.2	$ 7,815.2

Condensed Balance Sheets Parent

Condensed Balance Sheets Parenthetical - USD ($) shares in Millions, $ in Millions	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Assets
Accumulated depreciation	$ 5,120.4	$ 4,826.4	$ 4,724.6
Shareholders' equity:
Common stock, par value	$ 1	$ 1	$ 1
Common stock, authorized (in shares)	240	240	240
Common stock, issued	116.6	120.2	122.5
Common stock, outstanding	116.6	120.2	122.5

Condensed Statements of Operati

Condensed Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Statement [Abstract]
Sales	$ 1,589.5	$ 1,671.4	$ 4,868.8	$ 5,218.4
Operating expenses:
Cost of goods sold	1,455	1,402.3	4,289.2	4,236.6
Selling and administrative	111.7	90.9	308.2	303.9
Restructuring charges	7.9	11.9	23	92
Other operating income (expense)	0.6	(0.3)	0.8	27.2
Operating income	15.5	166	249.2	613.1
Interest expense	48.4	46.2	139.6	133.9
Interest income	1	1	2.7	3.2
Non-operating pension income	6.7	5.9	19.4	17
Income (loss) before taxes	(25.2)	126.7	131.7	499.4
Income tax provision	0	22.2	36.8	96.2
Net (loss) income	(25.2)	104.5	94.9	403.2
Net (loss) income attributable to noncontrolling interests	(0.3)	0.4	(3)	(4.1)
Net (loss) income attributable to Olin Corporation	$ (24.9)	$ 104.1	$ 97.9	$ 407.3
Net (loss) income attributable to Olin Corporation per common share:
Basic	$ (0.21)	$ 0.84	$ 0.83	$ 3.19
Diluted	$ (0.21)	$ 0.82	$ 0.81	$ 3.12
Average common shares outstanding:
Basic	116.9	124.2	118.4	127.5
Diluted	116.9	127	120.2	130.6

Condensed Statements of Compreh

Condensed Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net (loss) income	$ (25.2)	$ 104.5	$ 94.9	$ 403.2
Other comprehensive income, net of tax:
Foreign currency translation	2.3	(3.3)	(2.5)	(6.3)
Cash flow hedges	4.7	6.2	29.2	21
Pension and postretirement benefits	0.8	0.2	3.4	0.9
Total other comprehensive income, net of tax	7.8	3.1	30.1	15.6
Comprehensive (loss) income	(17.4)	107.6	125	418.8
Comprehensive (loss) income attributable to noncontrolling interests	(0.3)	0.4	(3)	(4.1)
Comprehensive (loss) income attributable to Olin Corporation	$ (17.1)	$ 107.2	$ 128	$ 422.9

Condensed Statements of Shareho

Condensed Statements of Shareholders' Equity - USD ($) $ in Millions	Total	Measurement Input, Expected Dividend Rate	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Noncontrolling Interest
Balance at beginning of period at Dec. 31, 2022			$ 132.3	$ 682.7	$ (495.9)	$ 2,224.5
Common stock repurchased and retired	$ (595.1)		(10.8)	(584.3)		0
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, net of tax	15.6				15.6
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
Net (loss) income attributable to Olin Corporation	407.3					407.3
Balance at beginning of period at Dec. 31, 2022							$ 0
Net (loss) income 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)		0
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, net of tax	3.1				3.1
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
Net (loss) income attributable to Olin Corporation	104.1					104.1
Balance at beginning of period at Jun. 30, 2023							39.6
Net (loss) income 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
Total equity	2,268.3
Balance at beginning of period at Dec. 31, 2023	2,232.4		120.2	24.8	(496.3)	2,583.7
Common stock repurchased and retired	(256.8)		(4.9)	(47.5)		(204.4)
Stock Issued During Period, Value, Stock Options Exercised	22.6		0.9	21.7
Common stock issued for other transactions			0.4	(4)
Stock-based compensation				5
Other comprehensive income, net of tax	30.1				30.1
Common stock dividends paid						(70.9)
Balance at end of period at Sep. 30, 2024	2,056.7		116.6	0	(466.2)	2,406.3
Net (loss) income attributable to Olin Corporation	97.9					97.9
Balance at beginning of period at Dec. 31, 2023	35.9						35.9
Net (loss) income attributable to noncontrolling interests	(3)						(3)
Contributions received from noncontrolling interests	0						0
Balance at end of period at Sep. 30, 2024	32.9						32.9
Dividends declared per share of common stock		0.60
Balance at beginning of period at Jun. 30, 2024			117.5	0	(474)	2,492.6
Common stock repurchased and retired			(1)	(6.3)		(38.1)
Stock Issued During Period, Value, Stock Options Exercised			0.1	0.8
Common stock issued for other transactions			0	0.2
Stock-based compensation				5.3
Other comprehensive income, net of tax	7.8				7.8
Common stock dividends paid						(23.3)
Balance at end of period at Sep. 30, 2024	2,056.7		$ 116.6	$ 0	$ (466.2)	2,406.3
Net (loss) income attributable to Olin Corporation	(24.9)					$ (24.9)
Balance at beginning of period at Jun. 30, 2024							33.2
Net (loss) income attributable to noncontrolling interests	(0.3)						(0.3)
Contributions received from noncontrolling interests							0
Balance at end of period at Sep. 30, 2024	32.9						$ 32.9
Dividends declared per share of common stock		$ 0.20
Total equity	$ 2,089.6

Condensed Statements of Cash Fl

Condensed Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Operating Activities
Net Income (Loss) Attributable to Parent	$ 94.9	$ 403.2
Adjustments to reconcile net income to net cash and cash equivalents provided by (used for) operating activities:
Depreciation and amortization	388.9	404.9
Gains on disposition of property, plant and equipment	0	27
Stock-based compensation	11.8	13.2
Write-off of equipment and facility included in restructuring charges	0	17.7
Deferred income taxes	(43.7)	(60.6)
Qualified pension plan contributions	(0.9)	(1.6)
Qualified pension plan income	(17.5)	(15)
Change in assets and liabilities:
Receivables	5.1	28.4
Income taxes receivable/payable	(21.5)	55.3
Inventories	32.8	(43.4)
Other current assets	2.1	9.8
Accounts payable and accrued liabilities	(77.2)	(222.7)
Other assets	(24.9)	(27.2)
Other noncurrent liabilities	6.2	29.5
Other operating activities	5.4	(6.8)
Net operating activities	361.5	557.7
Investing Activities
Capital expenditures	(144.1)	(173)
Payments under other long-term supply contracts	(58.6)	(46.2)
Proceeds from disposition of property, plant and equipment	0	28.8
Other investing activities	(4.3)	(3.6)
Net investing activities	(207)	(194)
Long-term debt:
Borrowings	587.4	587.7
Repayments	(370.7)	(381.1)
Common stock repurchased and retired	(256.8)	(595.1)
Stock options exercised	22.6	22.3
Employee taxes paid for share-based payment arrangements	(10.5)	0
Dividends paid	(70.9)	(76.6)
Contributions received from noncontrolling interests	0	44.1
Net financing activities	(98.9)	(398.7)
Effect of exchange rate changes on cash and cash equivalents	0	(0.7)
Net increase (decrease) in cash and cash equivalents	55.6	(35.7)
Cash and cash equivalents, beginning of year	170.3	194
Cash and cash equivalents, end of period	225.9	158.3
Cash paid for interest and income taxes:
Interest, net	156.5	148.9
Income taxes, net of refunds	95.6	81.9
Non-cash investing activities:
Decrease in capital expenditures included in accounts payable and accrued liabilities	$ 20.5	$ 17.9

DESCRIPTION OF BUSINESS

DESCRIPTION OF BUSINESS	9 Months Ended
	Sep. 30, 2024
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. BWA is an independent global trader of Electrochemical Unit (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 in our Chlor Alkali Products and Vinyls segment, with Mitsui’s 49% interest in BWA classified as noncontrolling interest. All intercompany accounts and transactions are eliminated in consolidation. We have prepared the condensed financial statements included herein, without audit, pursuant to the rules and regulations of the United States (U.S.) Securities and Exchange Commission (SEC). The preparation of the financial statements requires estimates and assumptions that affect amounts reported and disclosed in the financial statements and related notes. In our opinion, these financial statements reflect all adjustments (consisting only of normal accruals), which are necessary to present fairly the results for interim periods. Certain information and footnote disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles have been condensed or omitted pursuant to such rules and regulations; however, we believe that the disclosures are appropriate. We recommend that you read these condensed financial statements in conjunction with the financial statements, accounting policies and the notes thereto and Management’s Discussion and Analysis of Financial Condition and Results of Operations included in our Annual Report on Form 10-K for the year ended December 31, 2023.

RECENT ACCOUNTING PRONOUNCEMENT

RECENT ACCOUNTING PRONOUNCEMENTS	9 Months Ended
	Sep. 30, 2024
Accounting Standards Update and Change in Accounting Principle [Abstract]
RECENT ACCOUNTING PRONOUNCEMENTS	NOTE 2. RECENT ACCOUNTING PRONOUNCEMENTS In March 2024, the SEC issued SEC Release No. 33-11042, Enhancement and Standardization of Climate-Related Disclosures for Investors , to enhance and standardize the climate-related disclosures provided by public companies. The final rule will require the disclosure of greenhouse gas emissions, including Scope 1 and Scope 2 emissions, which will be subject to third-party assurance, as well as climate-related targets and goals, and how the Board of Directors and management oversee climate-related risks. Within the notes to financial statements, the final rule requires disclosure of expenditures recognized, subject to certain thresholds, attributable to severe weather events. The final rule follows a compliance phase-in timeline, with the first requirements required to be adopted with our fiscal year ending December 31, 2025, followed in later years by greenhouse gas-related requirements. On April 4, 2024, the SEC voluntarily stayed the implementation of these disclosure requirements; however, we are currently evaluating the impact of the final rule on our disclosures. In December 2023, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures , which includes amendments that further enhance income tax disclosures, primarily through standardization and disaggregation of rate reconciliation categories and income taxes paid by jurisdiction. The amendments are effective for annual periods beginning after December 15, 2024, with the option to early adopt at any time before the effective date. ASU 2023-09 allows for adoption on a prospective or retrospective basis. We will adopt this standard beginning with our fiscal year ending December 31, 2025. We are currently evaluating the impact of the standard on our consolidated financial statements and disclosures. In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280) Improvements to Reportable Segment Disclosures . ASU 2023-07 will improve reportable segment disclosure requirements, primarily through enhanced segment expense disclosures on an interim and annual basis. The update is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024, with the option to early adopt at any time before the effective date. ASU 2023-07 requires adoption on a retrospective basis. We will adopt this standard beginning with our fiscal year ending December 31, 2024, and for interim periods beginning with our first quarter fiscal year 2025. We are currently evaluating the impact of the standard on our consolidated financial statements and disclosures.

ACQUISITIONS

ACQUISITIONS	9 Months Ended
	Sep. 30, 2024
Business Combination and Asset Acquisition [Abstract]
Business Combination Disclosure [Text Block]	NOTE 3. ACQUISITIONS On October 1, 2023, Olin acquired the assets of White Flyer Targets, LLC (White Flyer) from Reagent Diversified Holdings, Inc. for $63.5 million. The acquisition was financed with cash on hand. White Flyer designs, manufactures and sells recreational trap, skeet, international and sporting clay targets and has been included in Olin’s Winchester segment. We recorded the aggregate excess purchase price over identifiable net tangible and intangible assets acquired and liabilities assumed, which included a final allocation of $2.4 million of goodwill allocated to our Winchester segment and $4.5 million of intangible assets subject to amortization. The final total assets acquired, excluding goodwill and intangibles, and liabilities assumed amounted to $66.6 million and $10.0 million, respectively. The acquisition is not material, and therefore, supplemental pro forma financial information is not provided.

RESTRUCTURING CHARGES

RESTRUCTURING CHARGES	9 Months Ended
	Sep. 30, 2024
Restructuring and Related Activities [Abstract]
RESTRUCTURING CHARGES	NOTE 4. 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 half of 2023 (collectively, Epoxy Optimization Plan). 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 were 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. We expect to incur additional restructuring charges through 2025 of approximately $10 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 the third quarter of 2022. We expect to incur additional restructuring charges through 2027 of approximately $20 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. We expect to incur additional restructuring charges through 2025 of approximately $5 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. We expect to incur additional restructuring charges through 2026 of approximately $15 million related to these actions. Pretax restructuring charges related to these actions include facility exit costs, lease and other contract termination costs, employee severance and related benefits costs and the write-off of equipment and facilities. Pretax restructuring charges, by plan, for the three and nine months ended September 30, 2024 and 2023, were as follows: Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 Pretax Restructuring Charges ($ in millions) Epoxy Optimization Plan $ 6.3 $ 8.6 $ 15.6 $ 79.7 McIntosh Plan — 0.7 2.0 4.6 Freeport 2021 Plan 0.3 0.7 1.0 2.8 Freeport 2019 Plan 1.3 1.9 4.4 4.9 Total restructuring charges $ 7.9 $ 11.9 $ 23.0 $ 92.0 The following table summarizes the 2024 and 2023 activities by major component of these restructuring actions and the remaining balances of accrued restructuring costs as of September 30, 2024 and 2023: Employee Severance and Related Benefit Costs Lease and Other Contract Termination Costs Facility Exit Costs Write-off of Equipment and Facility Total Restructuring Activity by Component ($ in millions) 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 Balance at January 1, 2024 $ 10.8 $ 16.7 $ — $ — $ 27.5 Restructuring charges: First quarter — — 8.3 — 8.3 Second quarter — 1.7 5.1 — 6.8 Third quarter — 2.9 5.0 — 7.9 Amounts utilized (8.4) (9.9) (18.4) — (36.7) Balance at September 30, 2024 $ 2.4 $ 11.4 $ — $ — $ 13.8 The following table summarizes the cumulative restructuring charges of these restructuring actions by major component through September 30, 2024: Chlor Alkali Products and Vinyls Epoxy Total McIntosh Plan Freeport 2021 Plan Freeport 2019 Plan Epoxy Optimization Plan Cumulative Restructuring Charges ($ in millions) Write-off of equipment and facility $ 2.7 $ — $ 58.9 $ 18.3 $ 79.9 Employee severance and related benefit costs — — 2.1 15.8 17.9 Facility exit costs 11.4 14.1 23.5 29.3 78.3 Lease and other contract termination costs 6.4 — — 33.7 40.1 Total cumulative restructuring charges $ 20.5 $ 14.1 $ 84.5 $ 97.1 $ 216.2 As of September 30, 2024, we have incurred cash expenditures of $122.5 million and non-cash charges of $79.9 million related to these restructuring actions. The remaining balance of $13.8 million is expected to be paid out through 2027.

EARNINGS PER SHARE

EARNINGS PER SHARE	9 Months Ended
	Sep. 30, 2024
Earnings Per Share [Abstract]
EARNINGS PER SHARE	NOTE 5. EARNINGS PER SHARE Basic and diluted net (loss) income attributable to Olin Corporation per share are computed by dividing net (loss) income attributable to Olin Corporation by the weighted-average number of common shares outstanding. Diluted net (loss) 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, 2024 2023 2024 2023 Computation of Net (Loss) Income per Share ($ in millions, except per share data) Net (loss) income attributable to Olin Corporation $ (24.9) $ 104.1 $ 97.9 $ 407.3 Basic shares 116.9 124.2 118.4 127.5 Basic net (loss) income attributable to Olin Corporation per share $ (0.21) $ 0.84 $ 0.83 $ 3.19 Diluted shares: Basic shares 116.9 124.2 118.4 127.5 Stock-based compensation — 2.8 1.8 3.1 Diluted shares 116.9 127.0 120.2 130.6 Diluted net (loss) income attributable to Olin Corporation per share $ (0.21) $ 0.82 $ 0.81 $ 3.12

ACCOUNTS RECEIVABLES

ACCOUNTS RECEIVABLES	9 Months Ended
	Sep. 30, 2024
Receivables [Abstract]
ACCOUNTS RECEIVABLE	NOTE 6. 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, 2024, December 31, 2023 and September 30, 2023, we had $339.8 million, $328.5 million and $350.0 million, respectively, drawn under the agreement. As of September 30, 2024, $473.9 million of our trade receivables were pledged as collateral and we had $0.3 million 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 $134.5 million and certain of our foreign subsidiaries may sell their accounts receivable up to a maximum of €16.5 million. We will continue to service the outstanding accounts sold. These receivables qualify for sales treatment under ASC 860 “Transfers and Servicing” and, accordingly, the proceeds are included in net cash provided by operating activities in the condensed statements of cash flows. The following table summarizes the AR Facilities activity: Nine Months Ended September 30, 2024 2023 AR Facilities ($ in millions) Balance at beginning of year $ 63.3 $ 111.8 Gross receivables sold 528.5 749.5 Payments received from customers on sold accounts (539.5) (788.6) Balance at end of period $ 52.3 $ 72.7 The factoring discount paid under the AR Facilities is recorded as interest expense on the condensed statements of operations. The factoring discount was $0.8 million and $1.3 million for the three months ended September 30, 2024 and 2023, respectively, and $2.9 million and $3.8 million for the nine months ended September 30, 2024 and 2023, respectively. The agreements are without recourse and therefore no recourse liability had been recorded as of September 30, 2024. Our condensed balance sheets included an allowance for doubtful accounts receivables of $12.2 million, $13.1 million and $12.8 million and other receivables of $94.5 million, $85.3 million and $78.0 million at September 30, 2024, December 31, 2023 and September 30, 2023, respectively, which were included in receivables, net.

INVENTORIES

INVENTORIES	9 Months Ended
	Sep. 30, 2024
Inventory Disclosure [Abstract]
INVENTORIES	NOTE 7. INVENTORIES Inventories consisted of the following: September 30, 2024 December 31, September 30, 2023 Inventories ($ in millions) Supplies $ 147.6 $ 160.3 $ 150.3 Raw materials 189.0 171.1 178.3 Work in process 159.9 153.5 188.4 Finished goods 499.1 507.6 615.5 Inventories excluding LIFO reserve 995.6 992.5 1,132.5 LIFO reserve (167.9) (133.7) (154.8) Inventories, net $ 827.7 $ 858.8 $ 977.7 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, 2024, reflect certain estimates relating to inventory quantities and costs at December 31, 2024. The replacement cost of our inventories would have been approximately $167.9 million, $133.7 million and $154.8 million higher than reported at September 30, 2024, December 31, 2023 and September 30, 2023, respectively.

OTHER ASSETS

OTHER ASSETS	9 Months Ended
	Sep. 30, 2024
Other Assets [Abstract]
OTHER ASSETS	NOTE 8. OTHER ASSETS Included in other assets were the following: September 30, 2024 December 31, 2023 September 30, 2023 Other Assets ($ in millions) Supply contracts $ 1,067.2 $ 1,061.8 $ 1,060.6 Other 64.3 56.7 56.7 Other assets $ 1,131.5 $ 1,118.5 $ 1,117.3 For the nine months ended September 30, 2024 and 2023, payments of $58.6 million and $46.2 million, respectively, were made under other long-term supply contracts for energy modernization projects in the U.S. Gulf Coast. Amortization expense of $18.3 million and $17.8 million for the three months ended September 30, 2024 and 2023, respectively, and amortization expense of $54.9 million and $53.4 million for the nine months ended September 30, 2024 and 2023, 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
	Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND INTANGIBLES	NOTE 9. GOODWILL AND INTANGIBLE ASSETS Changes in the carrying value of goodwill were as follows: Chlor Alkali Products and Vinyls Epoxy Winchester Total Goodwill ($ in millions) Balance at January 1, 2023 (1) $ 1,275.8 $ 145.1 $ — $ 1,420.9 Foreign currency translation adjustment 0.1 — — 0.1 Balance at September 30, 2023 (1) $ 1,275.9 $ 145.1 $ — $ 1,421.0 Balance at January 1, 2024 (1) $ 1,276.1 $ 145.2 $ 2.7 $ 1,424.0 Acquisition activity — — (0.3) (0.3) Balance at September 30, 2024 (1) $ 1,276.1 $ 145.2 $ 2.4 $ 1,423.7 (1) Includes cumulative goodwill impairment of $557.6 million and $142.2 million in Chlor Alkali Products and Vinyls and Epoxy, respectively. Intangible assets consisted of the following: September 30, 2024 December 31, 2023 September 30, 2023 Gross Amount Accumulated Amortization Net Gross Amount Accumulated Amortization Net Gross Amount Accumulated Amortization Net Intangible Assets ($ in millions) Customers, customer contracts and relationships $ 672.9 $ (464.3) $ 208.6 $ 671.7 $ (437.5) $ 234.2 $ 668.0 $ (426.8) $ 241.2 Trade names 3.5 (0.5) 3.0 3.6 (0.2) 3.4 — — — Acquired technology 94.7 (92.2) 2.5 94.4 (90.4) 4.0 92.8 (89.4) 3.4 Other 4.9 (0.7) 4.2 4.9 (0.7) 4.2 4.7 (0.7) 4.0 Total intangible assets $ 776.0 $ (557.7) $ 218.3 $ 774.6 $ (528.8) $ 245.8 $ 765.5 $ (516.9) $ 248.6

DEBT

DEBT	9 Months Ended
	Sep. 30, 2024
Debt Disclosure [Abstract]
DEBT	NOTE 10. DEBT Long-term loans, notes and other financing obligations, consisted of the following: September 30, 2024 December 31, 2023 September 30, 2023 Financing Obligations ($ in millions) Variable-rate Term Loan Facility, due 2027 $ 334.7 $ 341.3 $ 343.4 Variable-rate Senior Revolving Credit Facility, due 2027 350.0 68.0 165.0 Variable-rate Recovery Zone bonds, due 2024-2035 83.0 103.0 103.0 Variable-rate Go Zone bonds, due 2024 — 50.0 50.0 Variable-rate industrial development and environmental improvement obligations, due 2025 2.9 2.9 2.9 9.50% senior notes, due 2025 108.6 108.6 108.6 5.625% senior notes, due 2029 669.3 669.3 669.3 5.125% senior notes, due 2027 500.0 500.0 500.0 5.00% senior notes, due 2030 515.3 515.3 515.3 Receivables Financing Agreement (See Note 6) 339.8 328.5 350.0 Finance lease obligations — — 0.2 Other: Deferred debt issuance costs (14.0) (16.6) (17.4) Unamortized bond original issue discount (0.1) (0.2) (0.2) Total debt 2,889.5 2,670.1 2,790.1 Amounts due within one year 123.9 78.8 78.9 Total long-term debt $ 2,765.6 $ 2,591.3 $ 2,711.2 During the nine months ended September 30, 2024 and 2023, activity of our outstanding debt included: Nine Months Ended September 30, 2024 2023 Long-term Debt Borrowings (Repayments) ($ in millions) Borrowings Senior Revolving Credit Facility $ 490.0 $ 255.0 Receivables Financing Agreement 97.4 332.7 Total borrowings 587.4 587.7 Repayments Variable-rate Go Zone bonds, due 2024 (50.0) — Variable-rate Recovery Zone bonds, due 2024 (20.0) — Term Loan Facility (6.6) (6.6) Senior Revolving Credit Facility (208.0) (90.0) Receivables Financing Agreement (86.1) (282.7) Finance leases — (1.8) Total repayments (370.7) (381.1) Long-term debt borrowings, net $ 216.7 $ 206.6 Senior Credit Facility We maintain a $1,550.0 million senior credit facility (Senior Credit Facility) which 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 existing facility. The Term Loan Facility requires principal amortization payments which began on 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, 2024, we had $849.6 million available under our $1,200.0 million Senior Revolving Credit Facility because we had $350.0 million borrowed under the facility and issued $0.4 million of letters of credit. During the second quarter of 2024, we utilized our Senior Revolving Credit Facility to repay $50.0 million of Go Zone and $20.0 million of Recovery Zone tax-exempt variable-rate bonds. We were in compliance with all covenants and restrictions under all our outstanding credit agreements as of September 30, 2024, 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, 2024, 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
	Sep. 30, 2024
Retirement Benefits [Abstract]
PENSION PLANS AND RETIREMENT BENEFITS	NOTE 11. 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, 2024 2023 2024 2023 Components of Net Periodic Benefit (Income) Cost ($ in millions) Service cost $ 1.4 $ 1.4 $ — $ 0.1 Interest cost 25.5 26.4 0.2 0.4 Expected return on plans’ assets (33.5) (32.9) — — Amortization of prior service cost (0.2) (0.1) (0.2) — Recognized actuarial loss 1.6 0.3 (0.1) — Net periodic benefit (income) cost $ (5.2) $ (4.9) $ (0.1) $ 0.5 Pension Benefits Other Postretirement Benefits Nine Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 Components of Net Periodic Benefit (Income) Cost ($ in millions) Service cost $ 3.9 $ 4.2 $ 0.4 $ 0.5 Interest cost 76.1 79.1 1.1 1.3 Expected return on plans’ assets (101.2) (98.5) — — Amortization of prior service cost (0.5) (0.3) (0.2) 0.1 Recognized actuarial loss 4.9 0.9 0.4 0.4 Net periodic benefit (income) cost $ (16.8) $ (14.6) $ 1.7 $ 2.3 We made cash contributions to our international qualified defined benefit pension plans of $0.9 million and $1.6 million for the nine months ended September 30, 2024 and 2023, respectively.

INCOME TAXES

INCOME TAXES	9 Months Ended
	Sep. 30, 2024
Income Tax Disclosure [Abstract]
INCOME TAXES	NOTE 12. INCOME TAXES The effective tax rate for the three months ended September 30, 2024 included a net $2.9 million tax expense, primarily associated with a change in tax contingencies and remeasurement of deferred taxes due to an increase in our state effective tax rates, partially offset by a benefit from prior year tax positions. Excluding these items, the effective tax rate for the three months ended September 30, 2024 of 11.5% was lower than the 21.0% U.S. federal statutory rate primarily due to state income tax, foreign income inclusions and an increase in the estimated annual effective tax rate, partially offset by favorable permanent salt depletion deductions. 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. Excluding 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 favorable permanent salt depletion deductions and foreign income taxes. The effective tax rate for the nine months ended September 30, 2024 included a net $0.4 million tax benefit, primarily associated with stock-based compensation, U.S. Federal tax credits purchased at a discount, and a benefit from prior year tax positions, partially offset by a change in tax contingencies and remeasurement of deferred taxes due to an increase in our state effective tax rates. Excluding these items, the effective tax rate for the nine months ended September 30, 2024 of 28.2% was higher than the 21.0% U.S. federal statutory rate primarily due to state income tax and foreign income inclusions, partially offset by 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. Excluding 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. In August 2022, the Inflation Reduction Act (the "IRA") was enacted and provides various beneficial credits for energy efficient related manufacturing, transportation and fuels, hydrogen/carbon recapture and renewable energy, which we are evaluating in regard to planned projects. We will continue to monitor the expected impacts of any new guidance on our filing positions and will record the impacts as discrete income tax expense adjustments in the period the guidance is finalized or becomes effective. As of September 30, 2024, we had $55.9 million of gross unrecognized tax benefits, which would have a net $55.9 million impact on the effective tax rate, if recognized. The amounts of unrecognized tax benefits were as follows: Nine Months Ended September 30, 2024 2023 Unrecognized Tax Benefits ($ in millions) Balance at beginning of year $ 50.3 $ 51.6 Increases for prior year tax positions 5.6 1.3 Decreases for prior year tax positions (0.4) (0.3) Increases for current year tax positions 1.2 10.1 Decreases due to tax settlements (1.0) — Foreign currency translation adjustments 0.2 (0.6) Balance at end of period $ 55.9 $ 62.1 As of September 30, 2024, we believe it is reasonably possible that our total amount of unrecognized tax benefits will decrease by approximately $38.0 million over the next twelve months. The anticipated reduction primarily relates to expected settlements with tax 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 2020 - 2023 U.S. state income tax 2012 - 2023 Canadian federal income tax 2017 - 2023 Brazil 2017 - 2023 Germany 2015 - 2023 China 2014 - 2023 The Netherlands 2018 - 2023

DEFINED CONTRIBUTION PLAN

DEFINED CONTRIBUTION PLAN	9 Months Ended
	Sep. 30, 2024
Retirement Benefits [Abstract]
DEFINED CONTRIBUTION PLAN	NOTE 13. DEFINED CONTRIBUTION PLAN We sponsor a defined contribution plan for qualifying domestic employees, for which the company contributes between 5.0% and 7.5% of the employees eligible compensation into a retirement account (Company Contribution). Employees generally vest in the value of the Company Contribution according to a schedule based on service. Participants vest 50% after 2 years of service and 100% after 3 years of service. We also match a percentage of our employees contributions (Company Match), which are invested in the same investment allocation as the employee’s contributions. Employees immediately vest in the Company Match. Our contributions to the defined contribution plan were as follows: Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 Defined Contribution Plan Expense ($ in millions) Company Contribution $ 8.0 $ 8.4 $ 27.4 $ 28.6 Company Match 3.2 3.6 10.5 11.0 Total expense $ 11.2 $ 12.0 $ 37.9 $ 39.6

STOCK-BASED COMPENSATION

STOCK-BASED COMPENSATION	9 Months Ended
	Sep. 30, 2024
Share-Based Payment Arrangement [Abstract]
STOCK-BASED COMPENSATION	NOTE 14. STOCK-BASED COMPENSATION Stock-based compensation granted includes stock options, performance share awards, restricted stock awards and deferred directors’ compensation. Stock-based compensation expense was as follows: Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 Stock Compensation Expense ($ in millions) Stock-based compensation $ 6.3 $ 6.7 $ 17.3 $ 19.5 Mark-to-market adjustments 0.3 (2.3) (2.9) (2.4) Total expense $ 6.6 $ 4.4 $ 14.4 $ 17.1 Stock Options 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 Assumptions - Stock Options 2024 2023 Dividend yield 1.50 % 1.32 % Risk-free interest rate 4.35 % 4.07 % Expected volatility of Olin common stock 47 % 47 % Expected life (years) 7.0 7.0 Weighted-average grant fair value (per option) $ 24.79 $ 28.74 Weighted-average exercise price $ 53.43 $ 60.55 Stock options granted 606,157 562,124 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 Shares 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 Assumptions - Performance Shares 2024 2023 Risk-free interest rate 4.53 % 4.46 % Expected volatility of Olin common stock 41 % 52 % Expected average volatility of peer companies 37 % 42 % Average correlation coefficient of peer companies 0.40 0.51 Expected life (years) 3.0 3.0 Grant date fair value (TSR-based award) $ 72.80 $ 86.98 Grant date fair value (net income-based award) $ 54.07 $ 60.55 Performance share awards granted 180,714 161,474 The risk-free interest rate was based on zero coupon U.S. Treasury securities rates for the expected life of the performance share awards. The expected volatility of Olin common stock and peer companies was based on historical stock price movements, as we believe that historical experience is the best available indicator of the expected volatility. The average correlation coefficient of peer companies was determined based on historical trends of Olin’s common stock price compared to the peer companies. Expected life of the performance share award grant was based on historical exercise and cancellation patterns, as we believe that historical experience is the best estimate of future exercise patterns.

SHAREHOLDERS' EQUITY

SHAREHOLDERS' EQUITY	9 Months Ended
	Sep. 30, 2024
Stockholders' Equity Note [Abstract]
SHAREHOLDERS' EQUITY	NOTE 15. 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, 2024 and 2023, 4.9 million and 10.8 million shares, respectively, of common stock were repurchased and retired at a total value of $256.8 million and $595.1 million, respectively. As of September 30, 2024, 24.2 million shares of common stock have been repurchased and retired at a total value of $1,258.0 million under the 2022 Repurchase Authorization program, and $742.0 million of common stock remained authorized to be repurchased under the program. We issued 0.9 million and 0.8 million shares representing stock options exercised for the nine months ended September 30, 2024 and 2023, respectively, with a total value of $22.6 million and $22.3 million, respectively. The following table represents the activity included in accumulated other comprehensive loss: Foreign Currency Translation Cash Flow Hedges Pension and Postretirement Benefits Total Accumulated Other Comprehensive Loss ($ in millions) 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) Balance at January 1, 2024 $ (39.7) $ (18.4) $ (438.2) $ (496.3) Unrealized (losses) gains First quarter (2.3) (3.0) — (5.3) Second quarter (2.5) 17.1 — 14.6 Third quarter 2.3 (1.0) — 1.3 Reclassification adjustments of losses into income First quarter — 13.3 1.6 14.9 Second quarter — 5.3 1.9 7.2 Third quarter — 7.2 1.1 8.3 Tax provision First quarter — (2.6) (0.4) (3.0) Second quarter — (5.6) (0.5) (6.1) Third quarter — (1.5) (0.3) (1.8) Net change (2.5) 29.2 3.4 30.1 Balance at September 30, 2024 $ (42.2) $ 10.8 $ (434.8) $ (466.2) 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
	Sep. 30, 2024
Segment Reporting [Abstract]
SEGMENT INFORMATION	NOTE 16. 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. Sales are attributed to geographic areas based on customer location. Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 Segment Detail ($ in millions) Sales Chlor Alkali Products and Vinyls $ 871.6 $ 969.6 $ 2,676.5 $ 3,089.0 Epoxy 285.1 321.6 944.1 1,016.1 Winchester 432.8 380.2 1,248.2 1,113.3 Total sales $ 1,589.5 $ 1,671.4 $ 4,868.8 $ 5,218.4 Income (loss) before Taxes Chlor Alkali Products and Vinyls $ 45.3 $ 172.3 $ 221.2 $ 598.3 Epoxy (42.8) (28.8) (57.6) (7.9) Winchester 53.4 64.5 195.9 190.2 Corporate/Other: Environmental expense (7.2) (6.9) (19.4) (23.1) Other corporate and unallocated costs (25.9) (22.9) (68.7) (79.6) Restructuring charges (7.9) (11.9) (23.0) (92.0) Other operating income (expense) 0.6 (0.3) 0.8 27.2 Interest expense (48.4) (46.2) (139.6) (133.9) Interest income 1.0 1.0 2.7 3.2 Non-operating pension income 6.7 5.9 19.4 17.0 Income (loss) before taxes $ (25.2) $ 126.7 $ 131.7 $ 499.4 Other operating income (expense) for the nine months ended September 30, 2023, included a gain of $27.0 million for the sale of our domestic private trucking fleet and operations. Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 Segment Sales by Geography ($ in millions) Chlor Alkali Products and Vinyls United States $ 616.9 $ 651.0 $ 1,924.0 $ 2,069.8 Europe 48.5 57.9 129.3 175.3 Other foreign 206.2 260.7 623.2 843.9 Total Chlor Alkali Products and Vinyls 871.6 969.6 2,676.5 3,089.0 Epoxy United States 136.2 131.4 474.3 431.8 Europe 75.1 84.8 239.3 258.8 Other foreign 73.8 105.4 230.5 325.5 Total Epoxy 285.1 321.6 944.1 1,016.1 Winchester United States 376.9 327.7 1,110.1 982.9 Europe 22.2 19.8 69.7 43.4 Other foreign 33.7 32.7 68.4 87.0 Total Winchester 432.8 380.2 1,248.2 1,113.3 Total United States 1,130.0 1,110.1 3,508.4 3,484.5 Europe 145.8 162.5 438.3 477.5 Other foreign 313.7 398.8 922.1 1,256.4 Total sales $ 1,589.5 $ 1,671.4 $ 4,868.8 $ 5,218.4 Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 Segment Sales by Product Line ($ in millions) Chlor Alkali Products and Vinyls Caustic soda $ 352.1 $ 422.3 $ 1,084.6 $ 1,424.0 Chlorine, chlorine-derivatives and other products 519.5 547.3 1,591.9 1,665.0 Total Chlor Alkali Products and Vinyls 871.6 969.6 2,676.5 3,089.0 Epoxy Aromatics and allylics 105.8 116.9 389.0 387.9 Epoxy resins 179.3 204.7 555.1 628.2 Total Epoxy 285.1 321.6 944.1 1,016.1 Winchester Commercial 191.6 181.2 656.4 581.1 Military and law enforcement (1) 241.2 199.0 591.8 532.2 Total Winchester 432.8 380.2 1,248.2 1,113.3 Total sales $ 1,589.5 $ 1,671.4 $ 4,868.8 $ 5,218.4 (1) For the three months ended September 30, 2024 and 2023, revenue recognized over time represented $63.0 million and $28.7 million, respectively, and for the nine months ended September 30, 2024 and 2023, revenue recognized over time represented $120.6 million and $77.5 million, respectively, associated with governmental contracts within our Winchester business.

ENVIRONMENTAL

ENVIRONMENTAL	9 Months Ended
	Sep. 30, 2024
Environmental Remediation Obligations [Abstract]
ENVIRONMENTAL	NOTE 17. 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 $154.2 million, $153.6 million and $153.5 million at September 30, 2024, December 31, 2023 and September 30, 2023, respectively, of which $122.2 million, $121.6 million and $128.5 million, respectively, were classified as other noncurrent liabilities. Environmental provisions charged to income, which are included in costs of goods sold, were $7.2 million and $6.9 million for the three months ended September 30, 2024 and 2023, respectively, and $19.4 million and $23.1 million for the nine months ended September 30, 2024 and 2023, 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
	Sep. 30, 2024
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	NOTE 18. COMMITMENTS AND CONTINGENCIES We, and our subsidiaries, are defendants in various legal actions (including proceedings based on alleged exposures to asbestos) incidental to our past and current business activities. As of September 30, 2024, December 31, 2023 and September 30, 2023, our condensed balance sheets included accrued liabilities for these other legal actions of $14.1 million, $14.2 million and $15.3 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 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
	Sep. 30, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE FINANCIAL INSTRUMENTS	NOTE 19. 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, 2024 December 31, 2023 September 30, 2023 Notional Value - Foreign Currency ($ in millions) Buy $ — $ 21.0 $ 5.3 Sell 148.8 140.2 155.2 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, 2024 December 31, 2023 September 30, 2023 Notional Value - Commodity ($ in millions) Natural gas $ 64.3 $ 63.2 $ 67.2 Ethane 24.3 26.4 25.5 Metals 118.6 101.4 114.8 Total notional $ 207.2 $ 191.0 $ 207.5 As of September 30, 2024, the counterparties to these commodity contracts were Wells Fargo Bank, N.A., Citibank, N.A., JPMorgan Chase Bank, National Association, Toronto Dominion Bank and Bank of America Corporation, 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, 2024, we had open derivative contract positions through 2028. If all open futures contracts had been settled on September 30, 2024, we would have recognized a pretax gain of $14.3 million. If commodity prices were to remain at September 30, 2024 levels, approximately $7.3 million of deferred gains, net of tax, would be reclassified into earnings during the next twelve months. The actual effect on earnings will be dependent on actual commodity prices when the forecasted transactions occur. Fair Value Hedges We use interest rate swaps as a means of managing interest expense and floating interest rate exposure to optimal levels. For derivative instruments that are designated and qualify as a fair value hedge, the gain or loss on the derivative as well as the offsetting loss or gain on the hedged item attributable to the hedged risk are recognized in current earnings. We include the gain or loss on the hedged items (fixed-rate borrowings) in the same line item, interest expense, as the offsetting loss or gain on the related interest rate swaps. There were no outstanding interest rate swaps at September 30, 2024, December 31, 2023 and September 30, 2023. Financial Statement Impacts We present our derivative assets and liabilities in our condensed balance sheets on a net basis whenever we have a legally enforceable master netting agreement with the counterparty to our derivative contracts. We use these agreements to manage and substantially reduce our potential counterparty credit risk. The following table summarizes the location and fair value of the derivative instruments on our condensed balance sheets: September 30, 2024 December 31, 2023 September 30, 2023 Balance Sheet Location ($ in millions) Current Assets Commodity contracts Other current assets $ 16.0 $ 2.1 $ 1.3 Foreign currency contracts Other current assets — — 1.1 Noncurrent Assets Commodity contracts Other assets 4.7 3.2 3.2 Total derivative assets (1) $ 20.7 $ 5.3 $ 5.6 Current Liabilities Commodity contracts Accrued liabilities $ 6.4 $ 29.4 $ 17.8 Foreign currency contracts Accrued liabilities 3.4 2.5 — Noncurrent Liabilities Commodity contracts Other liabilities — 0.5 2.2 Total derivative liabilities (1) $ 9.8 $ 32.4 $ 20.0 (1) Does not include the impact of cash collateral received from or provided to counterparties, if any. The following table summarizes the effects of derivative instruments on our condensed statements of operations: Amount of Gain (Loss) for the Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 Location of Gain (Loss) ($ in millions) Cash Flow Hedges Commodity contracts Other comprehensive income (loss) $ (1.0) $ (1.9) $ 13.1 $ (33.4) Commodity contracts Cost of goods sold (7.2) (10.2) (25.8) (61.4) Not Designated as Hedging Instruments Commodity contracts Cost of goods sold — — — (0.6) Foreign exchange contracts Selling and administrative (6.1) 3.6 3.4 (9.6) 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, 2024, December 31, 2023 and September 30, 2023, 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
	Sep. 30, 2024
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	NOTE 20. 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 Measurement” (ASC 820), and directly related to the amount of subjectivity associated with the inputs to fair valuation of these assets and liabilities, 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. Commodity Contracts 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. 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. All commodity financial instruments were valued as a Level 2 under the fair value measurements hierarchy. Foreign Currency Contracts We enter into forward sales and purchase contracts to manage currency risk resulting from purchase and sale commitments denominated in foreign currencies. 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. All foreign currency contract financial instruments were valued as a Level 2 under the fair value measurements hierarchy. 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, 2024, December 31, 2023 and September 30, 2023, the fair value measurements of debt were $2,887.5 million, $2,626.2 million and $2,666.9 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, 2024, December 31, 2023 or September 30, 2023.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Pay vs Performance Disclosure
Pay vs Performance Disclosure, Table	Pay vs Performance Disclosure
Net (loss) income	$ 94.9	$ 403.2

Insider Trading Arrangements

Insider Trading Arrangements	9 Months Ended
	Sep. 30, 2024
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	58 Months Ended
	Sep. 30, 2024	Sep. 30, 2024
Restructuring and Related Activities [Abstract]
Schedule of Restructuring Reserve by Type of Cost	The following table summarizes the 2024 and 2023 activities by major component of these restructuring actions and the remaining balances of accrued restructuring costs as of September 30, 2024 and 2023: Employee Severance and Related Benefit Costs Lease and Other Contract Termination Costs Facility Exit Costs Write-off of Equipment and Facility Total Restructuring Activity by Component ($ in millions) 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 Balance at January 1, 2024 $ 10.8 $ 16.7 $ — $ — $ 27.5 Restructuring charges: First quarter — — 8.3 — 8.3 Second quarter — 1.7 5.1 — 6.8 Third quarter — 2.9 5.0 — 7.9 Amounts utilized (8.4) (9.9) (18.4) — (36.7) Balance at September 30, 2024 $ 2.4 $ 11.4 $ — $ — $ 13.8
Cumulative Restructuring Charges by Type and Plan	Pretax restructuring charges, by plan, for the three and nine months ended September 30, 2024 and 2023, were as follows: Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 Pretax Restructuring Charges ($ in millions) Epoxy Optimization Plan $ 6.3 $ 8.6 $ 15.6 $ 79.7 McIntosh Plan — 0.7 2.0 4.6 Freeport 2021 Plan 0.3 0.7 1.0 2.8 Freeport 2019 Plan 1.3 1.9 4.4 4.9 Total restructuring charges $ 7.9 $ 11.9 $ 23.0 $ 92.0	The following table summarizes the cumulative restructuring charges of these restructuring actions by major component through September 30, 2024: Chlor Alkali Products and Vinyls Epoxy Total McIntosh Plan Freeport 2021 Plan Freeport 2019 Plan Epoxy Optimization Plan Cumulative Restructuring Charges ($ in millions) Write-off of equipment and facility $ 2.7 $ — $ 58.9 $ 18.3 $ 79.9 Employee severance and related benefit costs — — 2.1 15.8 17.9 Facility exit costs 11.4 14.1 23.5 29.3 78.3 Lease and other contract termination costs 6.4 — — 33.7 40.1 Total cumulative restructuring charges $ 20.5 $ 14.1 $ 84.5 $ 97.1 $ 216.2

EARNINGS PER SHARE (Tables)

EARNINGS PER SHARE (Tables)	9 Months Ended
	Sep. 30, 2024
Earnings Per Share [Abstract]
Basic and Diluted Earnings Per Share Table	Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 Computation of Net (Loss) Income per Share ($ in millions, except per share data) Net (loss) income attributable to Olin Corporation $ (24.9) $ 104.1 $ 97.9 $ 407.3 Basic shares 116.9 124.2 118.4 127.5 Basic net (loss) income attributable to Olin Corporation per share $ (0.21) $ 0.84 $ 0.83 $ 3.19 Diluted shares: Basic shares 116.9 124.2 118.4 127.5 Stock-based compensation — 2.8 1.8 3.1 Diluted shares 116.9 127.0 120.2 130.6 Diluted net (loss) income attributable to Olin Corporation per share $ (0.21) $ 0.82 $ 0.81 $ 3.12

ACCOUNTS RECEIVABLES (Tables)

ACCOUNTS RECEIVABLES (Tables)	9 Months Ended
	Sep. 30, 2024
Receivables [Abstract]
AR Facilities	The following table summarizes the AR Facilities activity: Nine Months Ended September 30, 2024 2023 AR Facilities ($ in millions) Balance at beginning of year $ 63.3 $ 111.8 Gross receivables sold 528.5 749.5 Payments received from customers on sold accounts (539.5) (788.6) Balance at end of period $ 52.3 $ 72.7

INVENTORIES (Tables)

INVENTORIES (Tables)	9 Months Ended
	Sep. 30, 2024
Inventory Disclosure [Abstract]
Inventories Table	Inventories consisted of the following: September 30, 2024 December 31, September 30, 2023 Inventories ($ in millions) Supplies $ 147.6 $ 160.3 $ 150.3 Raw materials 189.0 171.1 178.3 Work in process 159.9 153.5 188.4 Finished goods 499.1 507.6 615.5 Inventories excluding LIFO reserve 995.6 992.5 1,132.5 LIFO reserve (167.9) (133.7) (154.8) Inventories, net $ 827.7 $ 858.8 $ 977.7

OTHER ASSETS (Tables)

OTHER ASSETS (Tables)	9 Months Ended
	Sep. 30, 2024
Other Assets [Abstract]
Schedule of Other Assets	Included in other assets were the following: September 30, 2024 December 31, 2023 September 30, 2023 Other Assets ($ in millions) Supply contracts $ 1,067.2 $ 1,061.8 $ 1,060.6 Other 64.3 56.7 56.7 Other assets $ 1,131.5 $ 1,118.5 $ 1,117.3 For the nine months ended September 30, 2024 and 2023, payments of $58.6 million and $46.2 million, respectively, were made under other long-term supply contracts for energy modernization projects in the U.S. Gulf Coast. Amortization expense of $18.3 million and $17.8 million for the three months ended September 30, 2024 and 2023, respectively, and amortization expense of $54.9 million and $53.4 million for the nine months ended September 30, 2024 and 2023, 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 (Tables)	9 Months Ended
	Sep. 30, 2024
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 Winchester Total Goodwill ($ in millions) Balance at January 1, 2023 (1) $ 1,275.8 $ 145.1 $ — $ 1,420.9 Foreign currency translation adjustment 0.1 — — 0.1 Balance at September 30, 2023 (1) $ 1,275.9 $ 145.1 $ — $ 1,421.0 Balance at January 1, 2024 (1) $ 1,276.1 $ 145.2 $ 2.7 $ 1,424.0 Acquisition activity — — (0.3) (0.3) Balance at September 30, 2024 (1) $ 1,276.1 $ 145.2 $ 2.4 $ 1,423.7
Schedule of Finite-Lived Intangible Assets	Intangible assets consisted of the following: September 30, 2024 December 31, 2023 September 30, 2023 Gross Amount Accumulated Amortization Net Gross Amount Accumulated Amortization Net Gross Amount Accumulated Amortization Net Intangible Assets ($ in millions) Customers, customer contracts and relationships $ 672.9 $ (464.3) $ 208.6 $ 671.7 $ (437.5) $ 234.2 $ 668.0 $ (426.8) $ 241.2 Trade names 3.5 (0.5) 3.0 3.6 (0.2) 3.4 — — — Acquired technology 94.7 (92.2) 2.5 94.4 (90.4) 4.0 92.8 (89.4) 3.4 Other 4.9 (0.7) 4.2 4.9 (0.7) 4.2 4.7 (0.7) 4.0 Total intangible assets $ 776.0 $ (557.7) $ 218.3 $ 774.6 $ (528.8) $ 245.8 $ 765.5 $ (516.9) $ 248.6

DEBT (Tables)

DEBT (Tables)	9 Months Ended
	Sep. 30, 2024
Debt Disclosure [Abstract]
Schedule of Long-Term Debt Instruments	Long-term loans, notes and other financing obligations, consisted of the following: September 30, 2024 December 31, 2023 September 30, 2023 Financing Obligations ($ in millions) Variable-rate Term Loan Facility, due 2027 $ 334.7 $ 341.3 $ 343.4 Variable-rate Senior Revolving Credit Facility, due 2027 350.0 68.0 165.0 Variable-rate Recovery Zone bonds, due 2024-2035 83.0 103.0 103.0 Variable-rate Go Zone bonds, due 2024 — 50.0 50.0 Variable-rate industrial development and environmental improvement obligations, due 2025 2.9 2.9 2.9 9.50% senior notes, due 2025 108.6 108.6 108.6 5.625% senior notes, due 2029 669.3 669.3 669.3 5.125% senior notes, due 2027 500.0 500.0 500.0 5.00% senior notes, due 2030 515.3 515.3 515.3 Receivables Financing Agreement (See Note 6) 339.8 328.5 350.0 Finance lease obligations — — 0.2 Other: Deferred debt issuance costs (14.0) (16.6) (17.4) Unamortized bond original issue discount (0.1) (0.2) (0.2) Total debt 2,889.5 2,670.1 2,790.1 Amounts due within one year 123.9 78.8 78.9 Total long-term debt $ 2,765.6 $ 2,591.3 $ 2,711.2
Schedule of Debt	During the nine months ended September 30, 2024 and 2023, activity of our outstanding debt included: Nine Months Ended September 30, 2024 2023 Long-term Debt Borrowings (Repayments) ($ in millions) Borrowings Senior Revolving Credit Facility $ 490.0 $ 255.0 Receivables Financing Agreement 97.4 332.7 Total borrowings 587.4 587.7 Repayments Variable-rate Go Zone bonds, due 2024 (50.0) — Variable-rate Recovery Zone bonds, due 2024 (20.0) — Term Loan Facility (6.6) (6.6) Senior Revolving Credit Facility (208.0) (90.0) Receivables Financing Agreement (86.1) (282.7) Finance leases — (1.8) Total repayments (370.7) (381.1) Long-term debt borrowings, net $ 216.7 $ 206.6

PENSION PLANS AND RETIREMENT _2

PENSION PLANS AND RETIREMENT BENEFITS (Tables)	9 Months Ended
	Sep. 30, 2024
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, 2024 2023 2024 2023 Components of Net Periodic Benefit (Income) Cost ($ in millions) Service cost $ 1.4 $ 1.4 $ — $ 0.1 Interest cost 25.5 26.4 0.2 0.4 Expected return on plans’ assets (33.5) (32.9) — — Amortization of prior service cost (0.2) (0.1) (0.2) — Recognized actuarial loss 1.6 0.3 (0.1) — Net periodic benefit (income) cost $ (5.2) $ (4.9) $ (0.1) $ 0.5 Pension Benefits Other Postretirement Benefits Nine Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 Components of Net Periodic Benefit (Income) Cost ($ in millions) Service cost $ 3.9 $ 4.2 $ 0.4 $ 0.5 Interest cost 76.1 79.1 1.1 1.3 Expected return on plans’ assets (101.2) (98.5) — — Amortization of prior service cost (0.5) (0.3) (0.2) 0.1 Recognized actuarial loss 4.9 0.9 0.4 0.4 Net periodic benefit (income) cost $ (16.8) $ (14.6) $ 1.7 $ 2.3

INCOME TAXES (Tables)

INCOME TAXES (Tables)	9 Months Ended
	Sep. 30, 2024
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits	The amounts of unrecognized tax benefits were as follows: Nine Months Ended September 30, 2024 2023 Unrecognized Tax Benefits ($ in millions) Balance at beginning of year $ 50.3 $ 51.6 Increases for prior year tax positions 5.6 1.3 Decreases for prior year tax positions (0.4) (0.3) Increases for current year tax positions 1.2 10.1 Decreases due to tax settlements (1.0) — Foreign currency translation adjustments 0.2 (0.6) Balance at end of period $ 55.9 $ 62.1
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 2020 - 2023 U.S. state income tax 2012 - 2023 Canadian federal income tax 2017 - 2023 Brazil 2017 - 2023 Germany 2015 - 2023 China 2014 - 2023 The Netherlands 2018 - 2023

DEFINED CONTRIBUTION PLAN (Tabl

DEFINED CONTRIBUTION PLAN (Tables)	9 Months Ended
	Sep. 30, 2024
Compensation Related Costs [Abstract]
Defined Contribution Plan Disclosures	Our contributions to the defined contribution plan were as follows: Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 Defined Contribution Plan Expense ($ in millions) Company Contribution $ 8.0 $ 8.4 $ 27.4 $ 28.6 Company Match 3.2 3.6 10.5 11.0 Total expense $ 11.2 $ 12.0 $ 37.9 $ 39.6

STOCK-BASED COMPENSATION (Table

STOCK-BASED COMPENSATION (Tables)	9 Months Ended
	Sep. 30, 2024
Share-Based Payment Arrangement [Abstract]
Stock-based compensation expense	Stock-based compensation expense was as follows: Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 Stock Compensation Expense ($ in millions) Stock-based compensation $ 6.3 $ 6.7 $ 17.3 $ 19.5 Mark-to-market adjustments 0.3 (2.3) (2.9) (2.4) Total expense $ 6.6 $ 4.4 $ 14.4 $ 17.1
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 Assumptions - Stock Options 2024 2023 Dividend yield 1.50 % 1.32 % Risk-free interest rate 4.35 % 4.07 % Expected volatility of Olin common stock 47 % 47 % Expected life (years) 7.0 7.0 Weighted-average grant fair value (per option) $ 24.79 $ 28.74 Weighted-average exercise price $ 53.43 $ 60.55 Stock options granted 606,157 562,124
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 Assumptions - Performance Shares 2024 2023 Risk-free interest rate 4.53 % 4.46 % Expected volatility of Olin common stock 41 % 52 % Expected average volatility of peer companies 37 % 42 % Average correlation coefficient of peer companies 0.40 0.51 Expected life (years) 3.0 3.0 Grant date fair value (TSR-based award) $ 72.80 $ 86.98 Grant date fair value (net income-based award) $ 54.07 $ 60.55 Performance share awards granted 180,714 161,474

SHAREHOLDERS' EQUITY (Tables)

SHAREHOLDERS' EQUITY (Tables)	9 Months Ended
	Sep. 30, 2024
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 Cash Flow Hedges Pension and Postretirement Benefits Total Accumulated Other Comprehensive Loss ($ in millions) 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) Balance at January 1, 2024 $ (39.7) $ (18.4) $ (438.2) $ (496.3) Unrealized (losses) gains First quarter (2.3) (3.0) — (5.3) Second quarter (2.5) 17.1 — 14.6 Third quarter 2.3 (1.0) — 1.3 Reclassification adjustments of losses into income First quarter — 13.3 1.6 14.9 Second quarter — 5.3 1.9 7.2 Third quarter — 7.2 1.1 8.3 Tax provision First quarter — (2.6) (0.4) (3.0) Second quarter — (5.6) (0.5) (6.1) Third quarter — (1.5) (0.3) (1.8) Net change (2.5) 29.2 3.4 30.1 Balance at September 30, 2024 $ (42.2) $ 10.8 $ (434.8) $ (466.2)

SEGMENT INFORMATION (Tables)

SEGMENT INFORMATION (Tables)	9 Months Ended
	Sep. 30, 2024
Segment Reporting [Abstract]
Segment Information	Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 Segment Detail ($ in millions) Sales Chlor Alkali Products and Vinyls $ 871.6 $ 969.6 $ 2,676.5 $ 3,089.0 Epoxy 285.1 321.6 944.1 1,016.1 Winchester 432.8 380.2 1,248.2 1,113.3 Total sales $ 1,589.5 $ 1,671.4 $ 4,868.8 $ 5,218.4 Income (loss) before Taxes Chlor Alkali Products and Vinyls $ 45.3 $ 172.3 $ 221.2 $ 598.3 Epoxy (42.8) (28.8) (57.6) (7.9) Winchester 53.4 64.5 195.9 190.2 Corporate/Other: Environmental expense (7.2) (6.9) (19.4) (23.1) Other corporate and unallocated costs (25.9) (22.9) (68.7) (79.6) Restructuring charges (7.9) (11.9) (23.0) (92.0) Other operating income (expense) 0.6 (0.3) 0.8 27.2 Interest expense (48.4) (46.2) (139.6) (133.9) Interest income 1.0 1.0 2.7 3.2 Non-operating pension income 6.7 5.9 19.4 17.0 Income (loss) before taxes $ (25.2) $ 126.7 $ 131.7 $ 499.4
Disaggregation of Revenue	Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 Segment Sales by Geography ($ in millions) Chlor Alkali Products and Vinyls United States $ 616.9 $ 651.0 $ 1,924.0 $ 2,069.8 Europe 48.5 57.9 129.3 175.3 Other foreign 206.2 260.7 623.2 843.9 Total Chlor Alkali Products and Vinyls 871.6 969.6 2,676.5 3,089.0 Epoxy United States 136.2 131.4 474.3 431.8 Europe 75.1 84.8 239.3 258.8 Other foreign 73.8 105.4 230.5 325.5 Total Epoxy 285.1 321.6 944.1 1,016.1 Winchester United States 376.9 327.7 1,110.1 982.9 Europe 22.2 19.8 69.7 43.4 Other foreign 33.7 32.7 68.4 87.0 Total Winchester 432.8 380.2 1,248.2 1,113.3 Total United States 1,130.0 1,110.1 3,508.4 3,484.5 Europe 145.8 162.5 438.3 477.5 Other foreign 313.7 398.8 922.1 1,256.4 Total sales $ 1,589.5 $ 1,671.4 $ 4,868.8 $ 5,218.4 Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 Segment Sales by Product Line ($ in millions) Chlor Alkali Products and Vinyls Caustic soda $ 352.1 $ 422.3 $ 1,084.6 $ 1,424.0 Chlorine, chlorine-derivatives and other products 519.5 547.3 1,591.9 1,665.0 Total Chlor Alkali Products and Vinyls 871.6 969.6 2,676.5 3,089.0 Epoxy Aromatics and allylics 105.8 116.9 389.0 387.9 Epoxy resins 179.3 204.7 555.1 628.2 Total Epoxy 285.1 321.6 944.1 1,016.1 Winchester Commercial 191.6 181.2 656.4 581.1 Military and law enforcement (1) 241.2 199.0 591.8 532.2 Total Winchester 432.8 380.2 1,248.2 1,113.3 Total sales $ 1,589.5 $ 1,671.4 $ 4,868.8 $ 5,218.4 (1) For the three months ended September 30, 2024 and 2023, revenue recognized over time represented $63.0 million and $28.7 million, respectively, and for the nine months ended September 30, 2024 and 2023, revenue recognized over time represented $120.6 million and $77.5 million, respectively, associated with governmental contracts within our Winchester business.

DERIVATIVE FINANCIAL INSTRUME_2

DERIVATIVE FINANCIAL INSTRUMENTS (Tables)	9 Months Ended
	Sep. 30, 2024
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, 2024 December 31, 2023 September 30, 2023 Notional Value - Foreign Currency ($ in millions) Buy $ — $ 21.0 $ 5.3 Sell 148.8 140.2 155.2
Schedule of derivative instruments	We had the following notional amounts of outstanding commodity contracts that were entered into to hedge forecasted purchases: September 30, 2024 December 31, 2023 September 30, 2023 Notional Value - Commodity ($ in millions) Natural gas $ 64.3 $ 63.2 $ 67.2 Ethane 24.3 26.4 25.5 Metals 118.6 101.4 114.8 Total notional $ 207.2 $ 191.0 $ 207.5
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: September 30, 2024 December 31, 2023 September 30, 2023 Balance Sheet Location ($ in millions) Current Assets Commodity contracts Other current assets $ 16.0 $ 2.1 $ 1.3 Foreign currency contracts Other current assets — — 1.1 Noncurrent Assets Commodity contracts Other assets 4.7 3.2 3.2 Total derivative assets (1) $ 20.7 $ 5.3 $ 5.6 Current Liabilities Commodity contracts Accrued liabilities $ 6.4 $ 29.4 $ 17.8 Foreign currency contracts Accrued liabilities 3.4 2.5 — Noncurrent Liabilities Commodity contracts Other liabilities — 0.5 2.2 Total derivative liabilities (1) $ 9.8 $ 32.4 $ 20.0 (1) Does not include the impact of cash collateral received from or provided to counterparties, if any.
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) for the Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 Location of Gain (Loss) ($ in millions) Cash Flow Hedges Commodity contracts Other comprehensive income (loss) $ (1.0) $ (1.9) $ 13.1 $ (33.4) Commodity contracts Cost of goods sold (7.2) (10.2) (25.8) (61.4) Not Designated as Hedging Instruments Commodity contracts Cost of goods sold — — — (0.6) Foreign exchange contracts Selling and administrative (6.1) 3.6 3.4 (9.6)

DESCRIPTION OF BUSINESS (Detail

DESCRIPTION OF BUSINESS (Details)	Jan. 10, 2023
Olin Corporation
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Subsidiary, Ownership Percentage, Parent	51%
Noncontrolling Interest [Line Items]
Subsidiary, Ownership Percentage, Parent	51%
Mitsui
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Subsidiary, Ownership Percentage, Noncontrolling Owner	49%
Noncontrolling Interest [Line Items]
Subsidiary, Ownership Percentage, Noncontrolling Owner	49%

ACQUISITIONS (Details)

ACQUISITIONS (Details) - White Flyer [Member] $ in Millions	Oct. 01, 2023 USD ($)
Asset Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	$ 63.5
Business Acquisition, Goodwill, Expected Tax Deductible Amount	2.4
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	4.5
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	66.6
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	$ 10

RESTRUCTURING CHARGES (Details

RESTRUCTURING CHARGES (Details 1) $ in Millions	3 Months Ended						9 Months Ended		43 Months Ended	44 Months Ended	58 Months Ended	102 Months Ended
	Sep. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2024 USD ($)	Oct. 21, 2021 T	Dec. 11, 2019 T
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 7.9	$ 6.8	$ 8.3	$ 11.9	$ 19.2	$ 60.9	$ 23	$ 92				$ 216.2
Inception to date Amounts Utilized (cash)												122.5
Inception to date Amounts Utilized (non-cash)												79.9
Epoxy Optimization Plan | Epoxy
Restructuring Cost and Reserve [Line Items]
Restructuring charges	6.3			8.6			15.6	79.7				97.1
Additional restructuring and related expected cost	10						10		$ 10	$ 10	$ 10	10
McIntosh Plan | Chlor Alkali Products and Vinyls
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0			0.7			2	4.6	20.5
Additional restructuring and related expected cost	20						20		20	20	20	20
McIntosh Restructuring Capacity Reduction | T													400,000
Freeport 2021 Plan | Chlor Alkali Products and Vinyls
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.3			0.7			1	2.8		14.1
Additional restructuring and related expected cost	5						5		5	5	5	5
Freeport 2019 Plan | Chlor Alkali Products and Vinyls
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1.3			$ 1.9			4.4	$ 4.9			84.5
Additional restructuring and related expected cost	$ 15						$ 15		$ 15	$ 15	$ 15	$ 15
Freeport Chlor Alkali Capacity Reduction | T														230,000

RESTRUCTURING CHARGES (Detail_2

RESTRUCTURING CHARGES (Details 2) - USD ($) $ in Millions	3 Months Ended						9 Months Ended		102 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Dec. 31, 2023	Dec. 31, 2022
Restructuring Cost and Reserve [Line Items]
Accrued restructuring costs	$ 13.8			$ 46.1			$ 13.8	$ 46.1	$ 13.8	$ 27.5	$ 13.6
Restructuring charges	7.9	$ 6.8	$ 8.3	11.9	$ 19.2	$ 60.9	23	92	216.2
Amounts utilized							(36.7)	(59.5)
Employee severance and related benefit costs
Restructuring Cost and Reserve [Line Items]
Accrued restructuring costs	2.4			11.9			2.4	11.9	2.4	10.8	9.4
Restructuring charges	0	0	0	2.6	3.3	0			17.9
Amounts utilized							(8.4)	(3.4)
Lease and other contract termination costs
Restructuring Cost and Reserve [Line Items]
Accrued restructuring costs	11.4			34.2			11.4	34.2	11.4	16.7	4.2
Restructuring charges	2.9	1.7	0	2	1.7	39.7			40.1
Amounts utilized							(9.9)	(13.4)
Facility exit costs
Restructuring Cost and Reserve [Line Items]
Accrued restructuring costs	0			0			0	0	0	0	0
Restructuring charges	5	5.1	8.3	7.3	9.3	8.4			78.3
Amounts utilized							(18.4)	(25)
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	$ 0	$ 0	$ 0	$ 4.9	$ 12.8			$ 79.9
Amounts utilized							$ 0	$ (17.7)

RESTRUCTURING CHARGES (Detail_3

RESTRUCTURING CHARGES (Details 3) - USD ($) $ in Millions	3 Months Ended						9 Months Ended		43 Months Ended	44 Months Ended	58 Months Ended	102 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2024
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 7.9	$ 6.8	$ 8.3	$ 11.9	$ 19.2	$ 60.9	$ 23	$ 92				$ 216.2
Employee severance and related benefit costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	0	0	2.6	3.3	0						17.9
Lease and other contract termination costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2.9	1.7	0	2	1.7	39.7						40.1
Facility exit costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	5	5.1	8.3	7.3	9.3	8.4						78.3
Write-off of equipment and facility
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	$ 0	$ 0	0	$ 4.9	$ 12.8						79.9
McIntosh Plan | Chlor Alkali Products and Vinyls
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0			0.7			2	4.6	$ 20.5
McIntosh Plan | Chlor Alkali Products and Vinyls | Employee severance and related benefit costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges									0
McIntosh Plan | Chlor Alkali Products and Vinyls | Lease and other contract termination costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges									6.4
McIntosh Plan | Chlor Alkali Products and Vinyls | Facility exit costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges									11.4
McIntosh Plan | Chlor Alkali Products and Vinyls | Write-off of equipment and facility
Restructuring Cost and Reserve [Line Items]
Restructuring charges									$ 2.7
Freeport 2021 Plan | Chlor Alkali Products and Vinyls
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.3			0.7			1	2.8		$ 14.1
Freeport 2021 Plan | Chlor Alkali Products and Vinyls | Employee severance and related benefit costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges										0
Freeport 2021 Plan | Chlor Alkali Products and Vinyls | Lease and other contract termination costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges										0
Freeport 2021 Plan | Chlor Alkali Products and Vinyls | Facility exit costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges										14.1
Freeport 2021 Plan | Chlor Alkali Products and Vinyls | Write-off of equipment and facility
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	1.3			1.9			4.4	4.9			$ 84.5
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 | Lease and other contract termination costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges											0
Freeport 2019 Plan | Chlor Alkali Products and Vinyls | Facility exit costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges											23.5
Freeport 2019 Plan | Chlor Alkali Products and Vinyls | Write-off of equipment and facility
Restructuring Cost and Reserve [Line Items]
Restructuring charges											$ 58.9
Epoxy Optimization Plan | Epoxy
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 6.3			$ 8.6			$ 15.6	$ 79.7				97.1
Epoxy Optimization Plan | Epoxy | Employee severance and related benefit costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges												15.8
Epoxy Optimization Plan | Epoxy | Lease and other contract termination costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges												33.7
Epoxy Optimization Plan | Epoxy | Facility exit costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges												29.3
Epoxy Optimization Plan | Epoxy | Write-off of equipment and facility
Restructuring Cost and Reserve [Line Items]
Restructuring charges												$ 18.3

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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Earnings Per Share [Abstract]
Net Income (Loss) Attributable to Parent			$ 94.9	$ 403.2
Net (loss) income attributable to noncontrolling interests	$ (0.3)	$ 0.4	(3)	(4.1)
Net (loss) income attributable to Olin Corporation	$ (24.9)	$ 104.1	$ 97.9	$ 407.3
Basic shares	116.9	124.2	118.4	127.5
Basic net (loss) income attributable to Olin Corporation per share	$ (0.21)	$ 0.84	$ 0.83	$ 3.19
Earnings Per Share, Diluted [Abstract]
Basic shares	116.9	124.2	118.4	127.5
Stock-based compensation	0	2.8	1.8	3.1
Diluted shares	116.9	127	120.2	130.6
Diluted net (loss) income attributable to Olin Corporation per share	$ (0.21)	$ 0.82	$ 0.81	$ 3.12
Antidilutive Securities Excluded from Computation of Earnings Per Share, Shares	3.3	1.3	1.9	1.3

ACCOUNTS RECEIVABLES (Details)

ACCOUNTS RECEIVABLES (Details) € in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 EUR (€)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Oct. 11, 2022 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022 Senior Credit Facility	$ 1,550		$ 1,550
Receivables Financing Agreement Outstanding Balance	339.8	$ 350	339.8	$ 350		$ 328.5
AR Facilities, Amount Outstanding to be Serviced	52.3	72.7	52.3	72.7		63.3	$ 111.8
AR Facilities, Gross receivables sold			528.5	749.5
AR Facilities, Payments received from customers on sold accounts			(539.5)	(788.6)
AR Facilities, Interest Expense	0.8	1.3	2.9	3.8
AR Facilities, Recourse Liability	0	0	0	0		0
Allowance for Doubtful Accounts	12.2	12.8	12.2	12.8		13.1
Other Receivables	94.5	78	94.5	78		85.3
United States
Accounts, Notes, Loans and Financing Receivable [Line Items]
AR Facilities, Maximum Outstanding Sales	134.5		134.5
Foreign
Accounts, Notes, Loans and Financing Receivable [Line Items]
AR Facilities, Maximum Outstanding Sales | €					€ 16.5
Receivables Financing Agreement
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables Financing Agreement Maximum Borrowing Capacity								$ 425
Receivables Financing Agreement Outstanding Balance	339.8	$ 350	339.8	$ 350		$ 328.5
Trade Receivables Pledged as Collateral for Secured Borrowings	473.9		473.9
Receivables Financing Agreement Available Borrowing Capacity	$ 0.3		$ 0.3

INVENTORIES (Details)

INVENTORIES (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Inventory Disclosure [Abstract]
Supplies	$ 147.6	$ 160.3	$ 150.3
Raw materials	189	171.1	178.3
Work in process	159.9	153.5	188.4
Finished goods	499.1	507.6	615.5
Inventories excluding LIFO reserve	995.6	992.5	1,132.5
LIFO reserve	(167.9)	(133.7)	(154.8)
Inventories, net	$ 827.7	$ 858.8	$ 977.7

OTHER ASSETS (Details)

OTHER ASSETS (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Other Assets [Abstract]
Supply contracts	$ 1,067.2	$ 1,060.6	$ 1,067.2	$ 1,060.6	$ 1,061.8
Other	64.3	56.7	64.3	56.7	56.7
Other assets	1,131.5	1,117.3	1,131.5	1,117.3	$ 1,118.5
Payments under other long-term supply contracts			58.6	46.2
Amortization of Supply Contracts	$ 18.3	$ 17.8	$ 54.9	$ 53.4

GOODWILL AND INTANGIBLE ASSET_2

GOODWILL AND INTANGIBLE ASSETS (Details 1) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2020	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Line Items]
Goodwill	$ 1,423.7	$ 1,421		$ 1,424	$ 1,420.9
Goodwill, Purchase Accounting Adjustments	(0.3)
Goodwill, Foreign Currency Translation Gain (Loss)		0.1
Chlor Alkali Products and Vinyls
Goodwill [Line Items]
Goodwill	1,276.1	1,275.9		1,276.1	1,275.8
Goodwill, Purchase Accounting Adjustments	0
Goodwill, Foreign Currency Translation Gain (Loss)		0.1
Goodwill, Impairment Loss			$ 557.6
Epoxy
Goodwill [Line Items]
Goodwill	145.2	145.1		145.2	145.1
Goodwill, Purchase Accounting Adjustments	0
Goodwill, Foreign Currency Translation Gain (Loss)		0
Goodwill, Impairment Loss			$ 142.2
Winchester
Goodwill [Line Items]
Goodwill	2.4	0		$ 2.7	$ 0
Goodwill, Purchase Accounting Adjustments	$ (0.3)
Goodwill, Foreign Currency Translation Gain (Loss)		$ 0

GOODWILL AND INTANGIBLE ASSET_3

GOODWILL AND INTANGIBLE ASSETS (Details 2) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Assets, Gross	$ 776	$ 774.6	$ 765.5
Finite-Lived Intangible Assets, Accumulated Amortization	(557.7)	(528.8)	(516.9)
Finite-Lived Intangible Assets, Net	218.3	245.8	248.6
Customers, customer contracts and relationships
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Assets, Gross	672.9	671.7	668
Finite-Lived Intangible Assets, Accumulated Amortization	(464.3)	(437.5)	(426.8)
Finite-Lived Intangible Assets, Net	208.6	234.2	241.2
Trade names
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Assets, Gross	3.5	3.6	0
Finite-Lived Intangible Assets, Accumulated Amortization	(0.5)	(0.2)	0
Finite-Lived Intangible Assets, Net	3	3.4	0
Acquired technology
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Assets, Gross	94.7	94.4	92.8
Finite-Lived Intangible Assets, Accumulated Amortization	(92.2)	(90.4)	(89.4)
Finite-Lived Intangible Assets, Net	2.5	4	3.4
Other
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Assets, Gross	4.9	4.9	4.7
Finite-Lived Intangible Assets, Accumulated Amortization	(0.7)	(0.7)	(0.7)
Finite-Lived Intangible Assets, Net	$ 4.2	$ 4.2	$ 4

DEBT (Details 1)

DEBT (Details 1) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Debt Instrument [Line Items]
Receivables Financing Agreement Outstanding Balance	$ 339.8	$ 328.5	$ 350
Supplier Finance Program, Obligation	0	0	0.2
Debt Issuance Costs, Noncurrent, Net	(14)	(16.6)	(17.4)
Debt Instrument, Unamortized Discount	(0.1)	(0.2)	(0.2)
Debt, Long-Term and Short-Term, Combined Amount	2,889.5	2,670.1	2,790.1
Increase (Decrease) in Notes Receivable, Current	123.9	78.8	78.9
Long-Term Debt	2,765.6	2,591.3	2,711.2
Variable-rate Term Loan [Member]
Debt Instrument [Line Items]
Notes Payable	334.7	341.3	343.4
Variable-rate Senior Revolving Facility
Debt Instrument [Line Items]
Notes Payable	350	68	165
Variable-rate Recovery Zone bonds
Debt Instrument [Line Items]
Notes Payable	83	103	103
Variable-rate Go Zone bonds
Debt Instrument [Line Items]
Notes Payable	0	50	50
Variable-rate industrial and environmental obligations
Debt Instrument [Line Items]
Notes Payable	2.9	2.9	2.9
9.5% senior note
Debt Instrument [Line Items]
Notes Payable	$ 108.6	$ 108.6	$ 108.6
Debt Instrument, Interest Rate, Stated Percentage	9.50%	9.50%	9.50%
5.625% senior note
Debt Instrument [Line Items]
Notes Payable	$ 669.3	$ 669.3	$ 669.3
Debt Instrument, Interest Rate, Stated Percentage	5.625%	5.625%	5.625%
5.125% senior note
Debt Instrument [Line Items]
Notes Payable	$ 500	$ 500	$ 500
Debt Instrument, Interest Rate, Stated Percentage	5.125%	5.125%	5.125%
5.00% senior note
Debt Instrument [Line Items]
Notes Payable	$ 515.3	$ 515.3	$ 515.3
Debt Instrument, Interest Rate, Stated Percentage	5%	5%	5%

Debt (Details 2)

Debt (Details 2) - USD ($) $ in Millions		9 Months Ended
	Oct. 11, 2022	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Debt Instrument [Line Items]
Proceeds from Issuance of Debt		$ 587.4	$ 587.7
Long-term Debt Repayments		(370.7)	(381.1)
Proceeds from (Repayments of) Debt		216.7	206.6
2022 Senior Credit Facility		1,550
Quarterly Required Principal Payment Percent Through 2024	0.625%
Quarterly Required Principal Payment Percent After 2024	1.25%
Repayments		(370.7)	(381.1)
Senior Revolving Credit Facility
Debt Instrument [Line Items]
Proceeds from Issuance of Debt		490	255
Long-term Debt Repayments		(208)	(90)
Repayments		(208)	(90)
Receivables Financing Agreement
Debt Instrument [Line Items]
Proceeds from Issuance of Debt		97.4	332.7
Long-term Debt Repayments		(86.1)	(282.7)
Repayments		(86.1)	(282.7)
Variable-rate Go Zone bonds
Debt Instrument [Line Items]
Long-term Debt Repayments		(50)	0
Notes Payable		0	50	$ 50
Repayments		(50)	0
Variable-rate Recovery Zone bonds
Debt Instrument [Line Items]
Long-term Debt Repayments		(20)	0
Notes Payable		83	103	$ 103
Repayments		(20)	0
Senior Term Loan
Debt Instrument [Line Items]
Long-term Debt Repayments		(6.6)	(6.6)
Repayments		(6.6)	(6.6)
Finance Leases
Debt Instrument [Line Items]
Long-term Debt Repayments		0	(1.8)
Repayments		0	$ (1.8)
$1,550.0 Million Secured Credit Facility
Debt Instrument [Line Items]
2022 Senior Credit Facility	$ 1,550
Notes Payable		350
350.0 Million Term Loan Facility
Debt Instrument [Line Items]
Term Loan Facility, Maximum Borrowing Capacity	350
$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		849.6
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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Qualified Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer			$ 0.9	$ 1.6
Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 1.4	$ 1.4	3.9	4.2
Interest cost	25.5	26.4	76.1	79.1
Expected return on plans’ assets	(33.5)	(32.9)	(101.2)	(98.5)
Amortization of prior service cost	(0.2)	(0.1)	(0.5)	(0.3)
Recognized actuarial loss	1.6	0.3	4.9	0.9
Net periodic benefit (income) cost	(5.2)	(4.9)	(16.8)	(14.6)
Other Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0	0.1	0.4	0.5
Interest cost	0.2	0.4	1.1	1.3
Expected return on plans’ assets	0	0	0	0
Amortization of prior service cost	(0.2)	0	(0.2)	0.1
Recognized actuarial loss	(0.1)	0	0.4	0.4
Net periodic benefit (income) cost	$ (0.1)	$ 0.5	$ 1.7	$ 2.3

PENSION PLANS AND RETIREMENT _4

PENSION PLANS AND RETIREMENT BENEFITS (Details 2) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Pension Benefits
Service cost	$ 1.4	$ 1.4	$ 3.9	$ 4.2
Interest cost	25.5	26.4	76.1	79.1
Expected return on plans’ assets	(33.5)	(32.9)	(101.2)	(98.5)
Amortization of prior service cost	(0.2)	(0.1)	(0.5)	(0.3)
Recognized actuarial loss	1.6	0.3	4.9	0.9
Net periodic benefit (income) cost	(5.2)	(4.9)	(16.8)	(14.6)
Other Postretirement Benefits
Service cost	0	0.1	0.4	0.5
Interest cost	0.2	0.4	1.1	1.3
Expected return on plans’ assets	0	0	0	0
Amortization of prior service cost	(0.2)	0	(0.2)	0.1
Recognized actuarial loss	(0.1)	0	0.4	0.4
Net periodic benefit (income) cost	$ (0.1)	$ 0.5	$ 1.7	$ 2.3

INCOME TAXES (Details 1)

INCOME TAXES (Details 1) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Effective Tax Rate, Discrete Items, net benefit (expense)	$ 2.9	$ 7.2	$ 0.4	$ 24.4
Effective Tax Rate, Discrete Items, net Percent	11.50%	23.20%	28.20%	24.10%
Statutory Federal Tax Rate	21%	21%	21%	21%
Impact on the effective tax rate, if recognized	$ 55.9		$ 55.9
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Balance at beginning of year			50.3	$ 51.6
Increases for prior year tax positions			5.6	1.3
Decreases for prior year tax positions			0.4	0.3
Increases for current year tax positions			1.2	10.1
Decreases due to tax settlements			(1)	0
Foreign currency translation adjustments			0.2	0.6
Balance at end of period	55.9	$ 62.1	55.9	$ 62.1
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	$ 38		$ 38

INCOME TAXES (Details 2)

INCOME TAXES (Details 2)	9 Months Ended
	Sep. 30, 2024
United States | Internal Revenue Service (IRS) | Minimum
Income Tax Examination [Line Items]
Open Tax Year	2020
United States | Internal Revenue Service (IRS) | Maximum
Income Tax Examination [Line Items]
Open Tax Year	2023
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	2023
Canada | Foreign Country | Minimum
Income Tax Examination [Line Items]
Open Tax Year	2017
Canada | Foreign Country | Maximum
Income Tax Examination [Line Items]
Open Tax Year	2023
Brazil | Foreign Country | Minimum
Income Tax Examination [Line Items]
Open Tax Year	2017
Brazil | Foreign Country | Maximum
Income Tax Examination [Line Items]
Open Tax Year	2023
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	2023
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	2023
The Netherlands | Foreign Country | Minimum
Income Tax Examination [Line Items]
Open Tax Year	2018
The Netherlands | Foreign Country | Maximum
Income Tax Examination [Line Items]
Open Tax Year	2023

DEFINED CONTRIBUTION PLAN (Deta

DEFINED CONTRIBUTION PLAN (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Defined Contribution Plan Disclosure [Line Items]
Defined Contribution Plan Initial Vesting Period Vested Percentage - After 2 Years			50%
Defined Contribution Plan Vesting Period - 2 Years			2 years
Defined Contribution Plan Initial Vesting Period Vested Percentage - After 3 Years			100%
Defined Contribution Plan Vesting Period - 3 Years			3 years
Defined Contribution Plan Employer Contribution of Eligible Compensation	$ 8,000,000	$ 8,400,000	$ 27,400,000	$ 28,600,000
Employer matching contributions to employee ownership plan	3,200,000	3,600,000	10,500,000	11,000,000
Total Defined Contribution Plan Expense	$ 11,200,000	$ 12,000,000	$ 37,900,000	$ 39,600,000
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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]
Stock-based compensation	$ 6.3	$ 6.7	$ 17.3	$ 19.5
Mark-to-market adjustments	0.3	(2.3)	(2.9)	(2.4)
Total expense	$ 6.6	$ 4.4	$ 14.4	$ 17.1

STOCK-BASED COMPENSATION (Det_2

STOCK-BASED COMPENSATION (Details 2) - USD ($)	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
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	1.50%	1.32%
Risk-free interest rate	4.35%	4.07%
Expected volatility of Olin common stock	47%	47%
Expected life (years)	7 years	7 years
Weighted-average grant fair value (per option)	$ 24.79	$ 28.74
Weighted-average exercise price	$ 53.43	$ 60.55
Stock options granted	606,157	562,124
Monte Carlo Simulation Model
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	4.53%	4.46%
Expected volatility of Olin common stock	41%	52%
Expected life (years)	3 years	3 years
Expected average volatility of peer companies	0.37	0.42
Average correlation coefficient of peer companies	0.40	0.51
Grant date fair value (TSR-based award)	$ 72.80	$ 86.98
Grant date fair value (net income-based award)	$ 54.07	$ 60.55
Performance share awards granted	180,714	161,474

SHAREHOLDERS' EQUITY (Details)

SHAREHOLDERS' EQUITY (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023	Jul. 28, 2022
Equity, Class of Treasury Stock [Line Items]
Stock Repurchased and Retired During Period, Value							$ 256.8	$ 595.1
Stock options exercised, Shares							900,000	800,000
Stock options exercised, Value							$ 22.6	$ 22.3
Foreign Currency Translation
Beginning balance			$ (39.7)			$ (38.6)	(39.7)	(38.6)
Unrealized (losses) gains	$ 2.3	$ (2.5)	(2.3)	$ (3.3)	$ (8.5)	5.5
Reclassification adjustments of losses (gains) into income	0	0	0	0	0	0
Tax benefit (provision)	0	0	0	0	0	0
Net change							(2.5)	(6.3)
Ending Balance	(42.2)			(44.9)			(42.2)	(44.9)
Cash Flow Hedges
Beginning balance			(18.4)			(32.5)	(18.4)	(32.5)
Unrealized (losses) gains	(1)	17.1	(3)	(1.9)	(10.7)	(20.8)
Reclassification adjustments of losses (gains) into income	7.2	5.3	13.3	10.2	20.5	30.7
Tax benefit (provision)	(1.5)	(5.6)	(2.6)	(2.1)	(2.4)	(2.5)
Net change	4.7			6.2			29.2	21
Ending balance	10.8			(11.5)			10.8	(11.5)
Pension and Postretirement Benefits
Beginning balance			(438.2)			(424.8)	(438.2)	(424.8)
Unrealized (losses) gains	0	0	0	0	0	0
Reclassification adjustments of losses (gains) into income	1.1	1.9	1.6	0.2	0.5	0.4
Tax benefit (provision)	(0.3)	(0.5)	(0.4)	0	(0.1)	(0.1)
Net change							3.4	0.9
Ending balance	(434.8)			(423.9)			(434.8)	(423.9)
Total
Beginning balance			(496.3)			(495.9)	(496.3)	(495.9)
Unrealized (losses) gains	1.3	14.6	(5.3)	(5.2)	(19.2)	(15.3)
Reclassification adjustments of losses (gains) into income	8.3	7.2	14.9	10.4	21	31.1
Tax benefit (provision)	(1.8)	$ (6.1)	$ (3)	(2.1)	$ (2.5)	$ (2.6)
Net change							30.1	15.6
Ending balance	(466.2)			$ (480.3)			$ (466.2)	$ (480.3)
Common Stock
Equity, Class of Treasury Stock [Line Items]
Stock Repurchased and Retired During Period, Shares							4,900,000	10,800,000
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							24,200,000
Stock Repurchased and Retired During Period, Value							$ 1,258
Remaining authorized repurchase amount (in dollars)	$ 742						$ 742

SEGMENT INFORMATION (Details 1)

SEGMENT INFORMATION (Details 1) - USD ($) $ in Millions	3 Months Ended						9 Months Ended		102 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024
Sales [Abstract]
Sales	$ 1,589.5			$ 1,671.4			$ 4,868.8	$ 5,218.4
Income (loss) before Taxes
Income (loss) before taxes	(25.2)			126.7			131.7	499.4
Corporate/Other:
Environmental expense	7.2			6.9			19.4	23.1
Restructuring charges	(7.9)	$ (6.8)	$ (8.3)	(11.9)	$ (19.2)	$ (60.9)	(23)	(92)	$ (216.2)
Other operating income (expense)	0.6			(0.3)			0.8	27.2
Interest expense	(48.4)			(46.2)			(139.6)	(133.9)
Interest income	1			1			2.7	3.2
Non-operating pension income	6.7			5.9			19.4	17
Gain on Sale of Domestic Private Trucking Fleet and Operations				27				27
Corporate/other
Corporate/Other:
Environmental expense	7.2			6.9			19.4	23.1
Other corporate and unallocated costs	(25.9)			(22.9)			(68.7)	(79.6)
Restructuring charges	(7.9)			(11.9)			(23)	(92)
Chlor Alkali Products and Vinyls
Sales [Abstract]
Sales	871.6			969.6			2,676.5	3,089
Income (loss) before Taxes
Income (loss) before taxes	45.3			172.3			221.2	598.3
Epoxy
Sales [Abstract]
Sales	285.1			321.6			944.1	1,016.1
Income (loss) before Taxes
Income (loss) before taxes	(42.8)			(28.8)			(57.6)	(7.9)
Winchester
Sales [Abstract]
Sales	432.8			380.2			1,248.2	1,113.3
Income (loss) before Taxes
Income (loss) before taxes	$ 53.4			$ 64.5			$ 195.9	$ 190.2

SEGMENT INFORMATION (Details 2)

SEGMENT INFORMATION (Details 2) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Sales	$ 1,589.5	$ 1,671.4	$ 4,868.8	$ 5,218.4
United States
Disaggregation of Revenue [Line Items]
Sales	1,130	1,110.1	3,508.4	3,484.5
Europe
Disaggregation of Revenue [Line Items]
Sales	145.8	162.5	438.3	477.5
Other foreign
Disaggregation of Revenue [Line Items]
Sales	313.7	398.8	922.1	1,256.4
Chlor Alkali Products and Vinyls
Disaggregation of Revenue [Line Items]
Sales	871.6	969.6	2,676.5	3,089
Chlor Alkali Products and Vinyls | United States
Disaggregation of Revenue [Line Items]
Sales	616.9	651	1,924	2,069.8
Chlor Alkali Products and Vinyls | Europe
Disaggregation of Revenue [Line Items]
Sales	48.5	57.9	129.3	175.3
Chlor Alkali Products and Vinyls | Other foreign
Disaggregation of Revenue [Line Items]
Sales	206.2	260.7	623.2	843.9
Epoxy
Disaggregation of Revenue [Line Items]
Sales	285.1	321.6	944.1	1,016.1
Epoxy | United States
Disaggregation of Revenue [Line Items]
Sales	136.2	131.4	474.3	431.8
Epoxy | Europe
Disaggregation of Revenue [Line Items]
Sales	75.1	84.8	239.3	258.8
Epoxy | Other foreign
Disaggregation of Revenue [Line Items]
Sales	73.8	105.4	230.5	325.5
Winchester
Disaggregation of Revenue [Line Items]
Sales	432.8	380.2	1,248.2	1,113.3
Winchester | United States
Disaggregation of Revenue [Line Items]
Sales	376.9	327.7	1,110.1	982.9
Winchester | Europe
Disaggregation of Revenue [Line Items]
Sales	22.2	19.8	69.7	43.4
Winchester | Other foreign
Disaggregation of Revenue [Line Items]
Sales	$ 33.7	$ 32.7	$ 68.4	$ 87

SEGMENT INFORMATION (Details 3)

SEGMENT INFORMATION (Details 3) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Sales	$ 1,589.5	$ 1,671.4	$ 4,868.8	$ 5,218.4
Transferred over Time
Disaggregation of Revenue [Line Items]
Sales	63	28.7	120.6	77.5
Chlor Alkali Products and Vinyls
Disaggregation of Revenue [Line Items]
Sales	871.6	969.6	2,676.5	3,089
Chlor Alkali Products and Vinyls | Caustic soda
Disaggregation of Revenue [Line Items]
Sales	352.1	422.3	1,084.6	1,424
Chlor Alkali Products and Vinyls | Chlorine, chlorine-derivatives and other co-products
Disaggregation of Revenue [Line Items]
Sales	519.5	547.3	1,591.9	1,665
Epoxy
Disaggregation of Revenue [Line Items]
Sales	285.1	321.6	944.1	1,016.1
Epoxy | Aromatics and allylics
Disaggregation of Revenue [Line Items]
Sales	105.8	116.9	389	387.9
Epoxy | Epoxy resins
Disaggregation of Revenue [Line Items]
Sales	179.3	204.7	555.1	628.2
Winchester
Disaggregation of Revenue [Line Items]
Sales	432.8	380.2	1,248.2	1,113.3
Winchester | Commercial
Disaggregation of Revenue [Line Items]
Sales	191.6	181.2	656.4	581.1
Winchester | Military and law enforcement
Disaggregation of Revenue [Line Items]
Sales	$ 241.2	$ 199	$ 591.8	$ 532.2

ENVIRONMENTAL (Details)

ENVIRONMENTAL (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Environmental Remediation Obligations [Abstract]
Reserves for future environmental expenditures - total	$ 154.2	$ 153.5	$ 154.2	$ 153.5	$ 153.6
Reserves for future environmental expenditures - noncurrent	122.2	128.5	122.2	128.5	$ 121.6
Environmental Remediation Expense	$ 7.2	$ 6.9	$ 19.4	$ 23.1

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Legal action accrued liabilities	$ 14.1	$ 14.2	$ 15.3

DERIVATIVE FINANCIAL INSTRUME_3

DERIVATIVE FINANCIAL INSTRUMENTS (Details Textuals) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Derivative [Line Items]
Notional amount	$ 207.2	$ 191	$ 207.5
Forward Contracts Buy
Derivative [Line Items]
Notional amount	0	21	5.3
Forward Contracts Sell
Derivative [Line Items]
Notional amount	148.8	$ 140.2	$ 155.2
Commodity Contract
Derivative [Line Items]
Cash Flow Hedges Derivative Instruments at Fair Value, Net	14.3
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	$ 7.3

DERIVATIVE FINANCIAL INSTRUME_4

DERIVATIVE FINANCIAL INSTRUMENTS (Details 1) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Derivative [Line Items]
Notional amount	$ 207.2	$ 191	$ 207.5
Forward Contracts Buy
Derivative [Line Items]
Notional amount	0	21	5.3
Forward Contracts Sell
Derivative [Line Items]
Notional amount	148.8	140.2	155.2
Natural Gas Commodity Forward Contracts
Derivative [Line Items]
Notional amount	64.3	63.2	67.2
Ethane Commodity Forward Contracts
Derivative [Line Items]
Notional amount	24.3	26.4	25.5
Metals Commodity Forward Contracts
Derivative [Line Items]
Notional amount	$ 118.6	$ 101.4	$ 114.8

DERIVATIVE FINANCIAL INSTRUME_5

DERIVATIVE FINANCIAL INSTRUMENTS (Details 2) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Derivatives, Fair Value [Line Items]
Asset derivatives	$ (20.7)	$ (5.3)	$ (5.6)
Liability derivatives	(9.8)	(32.4)	(20)
Commodity Contracts Gains | Designated as Hedging Instrument | Other Current Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	(16)	(2.1)	(1.3)
Commodity Contracts Gains | Designated as Hedging Instrument | Other Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	(4.7)	(3.2)	(3.2)
Foreign Exchange Contract Gain | Not Designated as Hedging Instrument | Other Current Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	0	0	(1.1)
Commodity Contracts Losses | Designated as Hedging Instrument | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	(6.4)	(29.4)	(17.8)
Commodity Contracts Losses | Designated as Hedging Instrument | Other Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	0	(0.5)	(2.2)
Foreign Exchange Contract Loss | Not Designated as Hedging Instrument | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	$ (3.4)	$ (2.5)	$ 0

DERIVATIVE FINANCIAL INSTRUME_6

DERIVATIVE FINANCIAL INSTRUMENTS (Details 3) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	$ (1)	$ 17.1	$ (3)	$ (1.9)	$ (10.7)	$ (20.8)
Commodity Contract | Cost of goods sold | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) for the	0			0			$ 0	$ (0.6)
Commodity Contract | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	(1)			(1.9)
Commodity Contract | Cash Flow Hedging | Other comprehensive income (loss)
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax							13.1	(33.4)
Commodity Contract | Cash Flow Hedging | Cost of goods sold
Derivative Instruments, Gain (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(7.2)			(10.2)			(25.8)	(61.4)
Foreign Exchange Contract | Selling and administrative | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) for the	$ (6.1)			$ 3.6			$ 3.4	$ (9.6)

FAIR VALUE MEASUREMENTS (Detail

FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Fair Value Disclosures [Abstract]
Long-term Debt, Fair Value	$ 2,887.5	$ 2,626.2	$ 2,666.9