Olin (OLN) 10-K 22 Feb 24 2023 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2023	Jan. 31, 2024	Jun. 30, 2023
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2023
Document Transition Report	false
Entity File Number	1-1070
Entity Registrant Name	OLIN CORPORATION
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 Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
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
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 6,447,684,308
Entity Common Stock, Shares Outstanding (in shares)		120,200,964
Entity Central Index Key	0000074303
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Amendment Flag	false
Auditor Name	KPMG LLP
Auditor Location	St. Louis, MO
Auditor Firm ID	185
Documents Incorporated by Reference	DOCUMENTS INCORPORATED BY REFERENCE Portions of the following document are incorporated by reference in this Form 10-K as indicated herein: Document Part of 10-K into which incorporated Proxy Statement relating to Olin’s Annual Meeting of Shareholders to be held in 2024 Part III
Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 170.3	$ 194
Receivables, net	874.7	924.6
Income taxes receivable	15.3	43.2
Inventories, net	858.8	941.9
Other current assets	54.1	52.7
Total current assets	1,973.2	2,156.4
Property, plant and equipment, net	2,519.6	2,674.1
Operating lease assets, net	344.7	356
Deferred income taxes	87.4	60.5
Other assets	1,118.5	1,102.5
Intangible assets, net	245.8	273.8
Goodwill	1,424	1,420.9
Total assets	7,713.2	8,044.2
Current liabilities:
Current installments of long-term debt	78.8	9.7
Accounts payable	775.4	837.7
Income taxes payable	154.7	133.4
Current operating lease liabilities	69.3	71.8
Accrued liabilities	450	508.8
Total current liabilities	1,528.2	1,561.4
Long-term debt	2,591.3	2,571
Operating lease liabilities	283.1	292.5
Accrued pension liability	225.8	234.5
Deferred income taxes	476.2	507.3
Other liabilities	340.3	333.9
Total liabilities	5,444.9	5,500.6
Commitments and contingencies
Shareholders’ equity:
Common stock, $1.00 par value per share: Authorized, 240.0 shares; issued and outstanding 120.2 and 132.3 shares	120.2	132.3
Additional paid-in capital	24.8	682.7
Accumulated other comprehensive loss	(496.3)	(495.9)
Retained earnings	2,583.7	2,224.5
Olin Corporation’s shareholders’ equity	2,232.4	2,543.6
Noncontrolling interests	35.9	0
Total equity	2,268.3	2,543.6
Total liabilities and equity	$ 7,713.2	$ 8,044.2

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares shares in Millions	Dec. 31, 2023	Dec. 31, 2022
Shareholders' Equity:
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, authorized (in shares)	240	240
Common stock, issued (in shares)	120.2	132.3
Common stock, outstanding (in shares)	120.2	132.3

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Statement [Abstract]
Sales	$ 6,833	$ 9,376.2	$ 8,910.6
Operating expenses:
Cost of goods sold	5,667.5	7,194.3	6,616.4
Selling and administrative	406.7	393.9	416.9
Restructuring charges	89.6	25.3	27.9
Other operating income	42.9	16.3	1.4
Operating income	712.1	1,779	1,850.8
Interest expense	181.1	143.9	348
Interest income	4.3	2.2	0.2
Non-operating pension income	24	38.7	35.7
Income before taxes	(559.3)	(1,676)	(1,538.7)
Income tax provision	107.3	349.1	242
Net income	452	1,326.9	1,296.7
Net loss attributable to noncontrolling interests	(8.2)	0	0
Net income attributable to Olin Corporation	$ 460.2	$ 1,326.9	$ 1,296.7
Net income attributable to Olin Corporation per common share:
Basic	$ 3.66	$ 9.16	$ 8.15
Diluted	$ 3.57	$ 8.94	$ 7.96
Average common shares outstanding:
Basic	125.9	144.9	159.1
Diluted	128.8	148.5	163

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 452	$ 1,326.9	$ 1,296.7
Other comprehensive (loss) income, net of tax:
Foreign currency translation	(1.1)	(27.7)	(30.3)
Cash flow hedges	14.1	(55.3)	1.4
Pension and postretirement benefits	(13.4)	75.1	230.8
Total other comprehensive (loss) income, net of tax	(0.4)	(7.9)	201.9
Comprehensive income	451.6	1,319	1,498.6
Comprehensive loss attributable to noncontrolling interests	(8.2)	0	0
Comprehensive income attributable to Olin Corporation	$ 459.8	$ 1,319	$ 1,498.6

CONSOLIDATED STATEMENTS OF SHAR

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	AOCI Attributable to Parent	Retained Earnings	Noncontrolling Interest
Dividends paid:
Noncontrolling interests						$ 0
Balance at Dec. 31, 2020		$ 158	$ 2,137.8	$ (689.9)	$ (155.1)
Common stock repurchased and retired		(4.7)	(247.2)
Common stock issued for:
Stock options exercised	$ 72.4	3.4	69
Other transactions		0.1	3.3
Stock-based compensation			6.7
Total other comprehensive (loss) income	201.9			201.9
Net income (loss)	1,296.7				1,296.7
Dividends paid:
Common stock ($0.80 per share)					(127.8)
Balance at Dec. 31, 2021	2,652.2	$ 156.8	1,969.6	(488)	1,013.8
Dividends paid:
Net loss attributable to noncontrolling interests	0					0
Proceeds from (Payments to) Noncontrolling Interests						0
Common dividends per share (in dollars per share)		$ 0.80
Noncontrolling interests						0
Total equity	2,652.2
Common stock repurchased and retired		$ (25.7)	(1,325)
Stock options exercised	25.7	1.1	24.6
Other transactions		0.1	3
Stock-based compensation			10.5
Total other comprehensive (loss) income	(7.9)			(7.9)
Net income (loss)	1,326.9				1,326.9
Common stock ($0.80 per share)					(116.2)
Balance at Dec. 31, 2022	2,543.6	$ 132.3	682.7	(495.9)	2,224.5
Dividends paid:
Net loss attributable to noncontrolling interests	0					0
Proceeds from (Payments to) Noncontrolling Interests						0
Common dividends per share (in dollars per share)		$ 0.80
Noncontrolling interests	0					0
Total equity	2,543.6
Common stock repurchased and retired		$ (13.3)	(698)
Stock options exercised	25.4	1	24.4
Other transactions		0.2	1.6
Stock-based compensation			14.1
Total other comprehensive (loss) income	(0.4)			(0.4)
Net income (loss)	452				460.2
Common stock ($0.80 per share)					(101)
Balance at Dec. 31, 2023	2,232.4	$ 120.2	$ 24.8	$ (496.3)	$ 2,583.7
Dividends paid:
Net loss attributable to noncontrolling interests	(8.2)					(8.2)
Proceeds from (Payments to) Noncontrolling Interests						44.1
Common dividends per share (in dollars per share)		$ 0.80
Noncontrolling interests	35.9					$ 35.9
Total equity	$ 2,268.3

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating Activities
Net income	$ 452	$ 1,326.9	$ 1,296.7
Adjustments to reconcile net income to net cash and cash equivalents provided by (used for) operating activities:
Depreciation and amortization	533.4	598.8	582.5
Gains on disposition of property, plant and equipment	(27)	(13)	(1.4)
Stock-based compensation	18.6	14.1	8.3
Loss on debt extinguishment	0	0	152.2
Write-off of equipment and facility included in restructuring charges	17.7	0	0
Deferred income taxes	(55.6)	(32.4)	(42.7)
Qualified pension plan contributions	(1.1)	(1.3)	(1.1)
Qualified pension plan income	21	33.1	27.8
Change in assets and liabilities:
Receivables	65.4	160.8	(360)
Income taxes receivable/payable	45.8	(2.9)	105.1
Inventories	94.4	(86.3)	(206)
Other current assets	(3.1)	15.9	(22.3)
Accounts payable and accrued liabilities	(133.9)	(22.3)	240.1
Other assets	(23.4)	(2.6)	(13.3)
Other noncurrent liabilities	15.8	(0.7)	26.2
Other operating activities	(3.7)	0	4.5
Net operating activities	974.3	1,921.9	1,741
Investing Activities
Capital expenditures	(236)	(236.9)	(200.6)
Business acquired in purchase transaction, net of cash acquired	63.9	0	0
Payments under other long-term supply contracts	(64.5)	(37.7)	0
Proceeds from disposition of property, plant and equipment	28.8	14.9	3.2
Other investing activities	(5.2)	0	0
Net investing activities	(340.8)	(259.7)	(197.4)
Long-term debt:
Borrowings	707.7	415	540
Repayments	621.8	616.1	1,643.1
Debt early redemption premiums	0	0	(137.7)
Common stock repurchased and retired	(711.3)	(1,350.7)	(251.9)
Stock options exercised	25.4	25.7	72.4
Dividends paid	(101)	(116.2)	(127.8)
Debt issuance costs	0	(4.4)	(3.9)
Contributions received from noncontrolling interests	44.1	0	0
Net financing activities	(656.9)	(1,646.7)	(1,552)
Effect of exchange rate changes on cash and cash equivalents	(0.3)	(2)	(0.8)
Net (decrease) increase in cash and cash equivalents	(23.7)	13.5	(9.2)
Cash and cash equivalents, beginning of year	194	180.5	189.7
Cash and cash equivalents, end of year	170.3	194	180.5
Cash paid for interest and income taxes:
Interest, net	176.8	141.7	345.2
Income taxes, net of refunds	$ 111.7	$ 356.6	$ 169.6

DESCRIPTION OF BUSINESS

DESCRIPTION OF BUSINESS	12 Months Ended
	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
DESCRIPTION OF BUSINESS	NOTE 1. DESCRIPTION OF BUSINESS Olin Corporation (Olin) is a Virginia corporation, incorporated in 1892, having its principal executive offices in Clayton, MO. We are a leading vertically integrated global manufacturer and distributor of chemical products and a leading U.S. manufacturer of ammunition. Our operations are concentrated in three business segments: Chlor Alkali Products and Vinyls, Epoxy and Winchester. All of our business segments are capital-intensive manufacturing businesses. The Chlor Alkali Products and Vinyls segment manufactures and sells chlorine and caustic soda, ethylene dichloride and vinyl chloride monomer, methyl chloride, methylene chloride, chloroform, carbon tetrachloride, perchloroethylene, hydrochloric acid, hydrogen, bleach products and potassium hydroxide. The Epoxy segment produces and sells a full range of epoxy materials and precursors, including aromatics (acetone and phenol), allyl chloride, epichlorohydrin, liquid epoxy resins, solid epoxy resins and systems and growth products such as converted epoxy resins and additives. The Winchester segment produces and sells sporting ammunition, reloading components, small caliber military ammunition and components, industrial cartridges, and clay targets. On January 10, 2023, Blue Water Alliance (BWA), our joint venture with Mitsui & Co., Ltd. (Mitsui), began operations. BWA is an independent global trader of ECU-based derivatives, focused on globally traded caustic soda and ethylene dichloride. Olin holds 51% interest and exercises control in BWA, and the joint venture is consolidated in our 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.

ACCOUNTING POLICIES

ACCOUNTING POLICIES	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
ACCOUNTING POLICIES	NOTE 2. ACCOUNTING POLICIES The preparation of the consolidated financial statements requires estimates and assumptions that affect amounts reported and disclosed in the financial statements and related notes. Actual results could differ from those estimates. Basis of Presentation The consolidated financial statements include the accounts of Olin and all majority-owned subsidiaries. Investments in our affiliates are accounted for using the equity method. Accordingly, we include only our share of earnings or losses of these affiliates in consolidated net income (loss). Revenue Recognition We derive our revenues primarily from the manufacturing and delivery of goods to customers. Revenues are recognized on sales of goods at the time when control of those goods is transferred to our customers at an amount that reflects the consideration to which we expect to be entitled in exchange for those goods. We primarily sell our goods directly to customers, and to a lesser extent, through distributors. Payment terms are typically 30 to 90 days from date of invoice. Our contracts do not typically have a significant financing component. Right to payment is determined at the point in time in which control has transferred to the customer. A performance obligation is a promise in a contract to transfer a distinct good to the customer. At contract inception, we assess the goods promised in our contracts with customers and identify a performance obligation for each promise to transfer to the customer a good (or bundle of goods) that is distinct. A contract’s transaction price is based on the price stated in the contract and allocated to each distinct performance obligation and revenue is recognized when the performance obligation is satisfied. Substantially all of our contracts have a single distinct performance obligation or multiple performance obligations which are distinct and represent individual promises within the contract. Substantially all of our performance obligations are satisfied at a single point in time, when control is transferred, which is generally upon shipment or delivery as stated in the contract terms. In some instances, primarily related to governmental contracts within our Winchester business, we recognize revenue over-time as control of the promised goods or services is being transferred to the customer using the cost-to-cost method of accounting. We believe this is an appropriate measure of progress toward satisfaction of performance obligations as this measure most accurately depicts the progress of our work and transfer of control to our customers. For the years ended December 31, 2023, 2022 and 2021, revenue recognized over time represented $104.8 million, $57.8 million and $22.8 million, respectively. All taxes assessed by governmental authorities that are both imposed on and concurrent with our revenue-producing transactions and collected from our customers are excluded from the measurement of the transaction price. Shipping and handling fees billed to customers are included in revenue and are considered activities to fulfill the promise to transfer the good. Allowances for estimated returns, discounts and rebates are considered variable consideration, which may be constrained, and are estimated and recognized when sales are recorded. The estimates are based on various market data, historical trends and information from customers. Actual returns, discounts and rebates have not been materially different from estimates. For all contracts that have a duration of one year or less at contract inception, we do not adjust the promised amount of consideration for the effects of a significant financing component. Substantially all of our revenue is derived from contracts with an original expected length of time of one year or less and for which we recognize revenue for the amount in which we have the right to invoice at the point in time in which control has transferred to the customer. However, a portion of our revenue is derived from long-term contracts which have contract periods that vary between one to multi-year. Certain of these contracts represent contracts with minimum purchase obligations, which can be substantially different than the actual revenue recognized. Such contracts consist of varying types of products across our chemical businesses. Certain contracts include variable volumes and/or variable pricing with pricing provisions tied to commodity, consumer price or other indices. The transaction price allocated to the remaining performance obligations related to our contracts was excluded from the disclosure of our remaining performance obligations based on the following practical expedients that we elected to apply: (i) contracts with index-based pricing or variable volume attributes in which such variable consideration is allocated entirely to a wholly unsatisfied performance obligation; and (ii) contracts with an original expected duration of one year or less. The timing of our customer billings does not always match the timing of our revenue recognition. When the Company is entitled to bill a customer in advance of the recognition of revenue, a contract liability is recognized. When the Company is not entitled to bill a customer until a period after the related recognition of revenue, a contract asset is recognized. Contract liabilities were $34.8 million and $43.4 million as of December 31, 2023 and 2022, respectively, and are included as a component of accrued liabilities and other liabilities in our consolidated balance sheets. Contract assets were $20.1 million and $16.2 million as of December 31, 2023 and 2022, respectively, and are included as a component of other current assets and other assets in our consolidated balance sheets. Substantially all our contract liabilities, net of contract assets, are expected to be realized within one year, when the related performance obligations are satisfied. Cost of Goods Sold and Selling and Administrative Expenses Cost of goods sold includes the costs of inventory sold, related purchasing, distribution and warehousing costs, costs incurred for shipping and handling, depreciation and amortization expense related to these activities and environmental remediation costs and recoveries. Selling and administrative expenses include personnel costs associated with sales, marketing and administrative, research and development, legal and legal-related costs, consulting and professional services fees, advertising expenses, depreciation expense related to these activities, foreign currency translation and other similar costs. Acquisition-related Costs Acquisition-related costs include advisory, legal, accounting and other professional fees incurred in connection with the purchase and integration of our acquisitions. Acquisition-related costs also may include costs which arise as a result of acquisitions, including contractual change in control provisions, contract termination costs, compensation payments related to the acquisition or pension and other postretirement benefit plan settlements. Other Operating Income (Expense) Other operating income (expense) consists of miscellaneous operating income items, which are related to our business activities, and gains (losses) on disposition of property, plant and equipment. Other operating income for the year ended December 31, 2023, included a gain of $27.0 million from the sale of our domestic private trucking fleet and operations and a gain of $15.6 million for insurance recoveries associated with a second quarter 2022 business interruption at our Plaquemine, LA, Chlor Alkali Products and Vinyls facility. Other operating income for the year ended December 31, 2022, included $13.0 million of gains from the sale of two former manufacturing facilities. Other operating income for the year ended December 31, 2021, included a $1.4 million gain from the sale of a terminal facility. Other Income (Expense) Other income (expense) consists of non-operating income and expense items which are not related to our primary business activities. Foreign Currency Translation Our worldwide operations utilize the U.S. dollar (USD) or local currency as the functional currency, where applicable. For foreign entities where the USD is the functional currency, gains and losses resulting from balance sheet remeasurement are included in selling and administrative. For foreign entities where the local currency is the functional currency, assets and liabilities denominated in local currencies are translated into USD at end-of-period exchange rates and the resultant translation adjustments are included in accumulated other comprehensive loss. Assets and liabilities denominated in other than the local currency are remeasured into the local currency prior to translation into USD and the resultant exchange gains or losses are included in income in the period in which they occur. Income and expenses are translated into USD using an approximation of the average rate prevailing during the period. We change the functional currency of our separate and distinct foreign entities only when significant changes in economic facts and circumstances indicate clearly that the functional currency has changed. Cash and Cash Equivalents All highly liquid investments, with a maturity of three months or less at the date of purchase, are considered cash equivalents. Short-Term Investments We classify our marketable securities as available-for-sale, which are reported at fair market value with unrealized gains and losses included in accumulated other comprehensive loss, net of applicable taxes. The fair value of marketable securities is determined by quoted market prices. Realized gains and losses on sales of investments, as determined on the specific identification method, and declines in value of securities judged to be other-than-temporary are included in other income (expense) in the consolidated statements of operations. Interest and dividends on all securities are included in interest income and other income (expense), respectively. As of December 31, 2023 and 2022, no short-term investments were recorded on our consolidated balance sheets. Allowance for Doubtful Accounts Receivable We evaluate the collectibility of financial instruments based on our current estimate of credit losses expected to be incurred over the life of the financial instrument. The only significant financial instrument which creates exposure to credit losses are customer accounts receivables. We measure credit losses on uncollected accounts receivable through an allowance for doubtful accounts receivable which is based on a combination of factors including both historical collection experience and reasonable estimates that affect the expected collectibility of the receivable. These factors include historical bad debt experience, industry conditions of the customer or group of customers, geographical region, credit ratings and general market conditions. We group receivables together for purposes of estimating credit losses when customers have similar risk characteristics; otherwise, the estimation is performed on the individual receivable. This estimate is periodically adjusted when we become aware of a specific customer’s inability to meet its financial obligations (e.g., bankruptcy filing) or as a result of changes in the overall aging of accounts receivable. While we have a large number of customers that operate in diverse businesses and are geographically dispersed, a general economic downturn in any of the industry segments in which we operate could result in higher-than-expected defaults, and, therefore, the need to revise estimates for the provision for doubtful accounts could occur. Inventories Inventories are valued at the lower of cost and net realizable value. For U.S. inventories, inventory costs are determined principally by the last-in, first-out (LIFO) method of inventory accounting while for international inventories, inventory costs are determined principally by the first-in, first-out (FIFO) method of inventory accounting. Costs for other inventories have been determined principally by the average-cost method (primarily operating supplies, spare parts and maintenance parts). Elements of costs in inventories include raw materials, direct labor and manufacturing overhead. See Note 8 “Inventories” for additional information. Property, Plant and Equipment Property, plant and equipment are recorded at cost. Depreciation is computed on a straight-line basis over the estimated useful lives of the related assets. Interest costs incurred to finance expenditures for major long-term construction projects are capitalized as part of the historical cost and included in property, plant and equipment and are depreciated over the useful lives of the related assets. Leasehold improvements are amortized over the term of the lease or the estimated useful life of the improvement, whichever is shorter. Start-up costs are expensed as incurred. Expenditures for maintenance and repairs are charged to expense when incurred while the costs of significant improvements, which extend the useful life of the underlying asset, are capitalized. Property, plant and equipment are reviewed for impairment when conditions indicate that the carrying values of the asset group may not be recoverable. Such impairment conditions include an extended period of idleness or a plan of disposal. If such impairment indicators are present or other factors exist that indicate that the carrying amount of an asset group may not be recoverable, we determine whether impairment has occurred through the use of an undiscounted cash flow analysis at the lowest level for which identifiable cash flows exist. For our Chlor Alkali Products and Vinyls, Epoxy and Winchester segments, the lowest level for which identifiable cash flows exist is the operating facility level or an appropriate grouping of operating facilities level, which represents the asset group. The amount of impairment loss, if any, is measured by the difference between the net book value of the assets and the estimated fair value of the related asset group. See Note 9 “Property, Plant and Equipment” for additional information. Leases We determine if an arrangement is a lease at inception of the contract. Operating lease assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. Operating lease assets and liabilities are recognized at commencement date based on the present value of fixed lease payments over the lease term. Our lease commitments are primarily for railcars, but also include logistics, manufacturing, storage, real estate and information technology assets. Leases with an initial term of 12 months or less are not recorded on the balance sheet; instead, we recognize lease expense for these leases on a straight-line basis over the lease term. We do not account for lease components (e.g., fixed payments to use the underlying lease asset) separately from the non-lease components (e.g., fixed payments for common-area maintenance costs and other items that transfer a good or service). Some of our leases include variable lease payments, which primarily result from changes in consumer price and other market-based indices, which are generally updated annually, and maintenance and usage charges. These variable payments are excluded from the calculation of our lease assets and liabilities. Most leases include one or more options to renew, with renewal terms that can extend the lease term from one-to-many years. The exercise of lease renewal options is typically at our sole discretion. Certain leases also include options to purchase the leased asset. We do not include options to renew or purchase leased assets in the measurement of lease liabilities unless those options are highly certain of exercise. The depreciable life of assets and leasehold improvements are limited by the expected lease term, unless there is a transfer of title or purchase option reasonably certain of exercise. We have operating leases with terms that require us to guarantee a portion of the residual value of the leased assets upon termination of the lease as well as other guarantees. These residual value guarantees consist primarily of leases for railcars. Residual value guarantee payments that become probable and estimable are accrued as part of the lease liability and recognized over the remaining life of the applicable lease. Our current expectation is that the likelihood of material residual guarantee payments is remote. We utilize the interest rate implicit in the lease to determine the lease liability when the interest rate can be determined. As most of our leases do not provide an implicit rate, we use our incremental borrowing rate based on the information available at the lease commencement date in determining the present value of lease payments. We estimate the incremental borrowing rate based on the geographic region for which we would borrow, on a secured basis of the lease asset, at an amount equal to the lease payments over a similar time period as the lease term. We have no additional restrictions or covenants imposed by our lease contracts. See Note 22 “Leases” for additional information. Asset Retirement Obligations We record the fair value of an asset retirement obligation associated with the retirement of a tangible long-lived asset as a liability in the period incurred. The liability is measured at discounted fair value and is adjusted to its present value in subsequent periods as accretion expense is recorded. The corresponding asset retirement costs are capitalized as part of the carrying amount of the related long-lived asset and depreciated over the asset’s useful life. Asset retirement obligations are reviewed annually in the fourth quarter and/or when circumstances or other events indicate that changes underlying retirement assumptions may have occurred. The activities of our asset retirement obligations were as follows: December 31, 2023 2022 Asset Retirement Obligation Activity ($ in millions) Beginning balance $ 66.3 $ 70.2 Accretion 3.3 3.8 Spending (5.0) (8.7) Adjustments 8.2 1.0 Ending balance $ 72.8 $ 66.3 At December 31, 2023 and 2022, our consolidated balance sheets included an asset retirement obligation of $63.3 million and $52.6 million, respectively, which were classified as other noncurrent liabilities. In 2023 and 2022, we had net adjustments that increased the asset retirement obligation by $8.2 million and $1.0 million, respectively, which were primarily comprised of increases in estimated costs for certain assets. Comprehensive Income (Loss) Accumulated other comprehensive loss consists of foreign currency translation adjustments, pension and postretirement liability adjustments, pension and postretirement amortization of prior service costs and actuarial losses and net unrealized gains (losses) on derivative contracts. Purchase Accounting In accordance with Accounting Standards Codification (ASC) 805, “Business Combinations,” we record the fair value of purchase consideration for the tangible and intangible assets acquired and liabilities assumed based on their estimated fair values on the acquisition date. The excess of purchase price over the aggregate fair value is recorded as goodwill. Intangible assets are valued using the relief from royalty and multi-period excess earnings methodologies, considered Level 3 measurements. Key assumptions in valuing certain intangible assets include, but are not limited to, future expected cash flows from acquired customers, useful lives, royalty rates, and discount rates. Our fair value estimates are based upon assumptions believed to be reasonable, but which are inherently uncertain and unpredictable and, as a result, may differ from actual results. Changes in the estimated fair values of net assets recorded for acquisitions before the finalization of more detailed analysis, but not over one year from the acquisition date, will adjust the purchase price allocatable to goodwill. Any adjustments after the one-year measurement period are recorded in earnings. Goodwill Goodwill is not amortized, but is reviewed for impairment annually in the fourth quarter and/or when circumstances or other events indicate that impairment may have occurred. ASC 350 “Intangibles—Goodwill and Other” permits entities to make a qualitative assessment of whether it is more likely than not that a reporting unit’s fair value is less than its carrying amount before applying the goodwill impairment test. Circumstances that are considered as part of the qualitative assessment and could trigger a quantitative impairment test include, but are not limited to: a significant adverse change in the business climate; a significant adverse legal judgment; adverse cash flow trends; an adverse action or assessment by a government agency; unanticipated competition; sustained decline in our stock price; and a significant restructuring charge within a reporting unit. We define reporting units at the business segment level or one level below the business segment level. For purposes of testing goodwill for impairment, goodwill has been allocated to our reporting units to the extent it relates to each reporting unit. It is our practice, at a minimum, to perform a quantitative goodwill impairment test in the fourth quarter every three years. In the fourth quarter of 2023, we performed our triennial quantitative goodwill impairment test for our reporting units. We use a discounted cash flow approach to develop the estimated fair value of a reporting unit when a quantitative test is performed. Management judgment is required in developing the assumptions for the discounted cash flow model. We also corroborate our discounted cash flow analysis by evaluating a market-based approach that considers earnings before interest, taxes, depreciation and amortization (EBITDA) multiples from a representative sample of comparable public companies. As a further indicator that each reporting unit has been valued appropriately using a discounted cash flow model, the aggregate fair value of all reporting units is reconciled to the total market value of Olin. An impairment would be recorded if the carrying amount of a reporting unit exceeded the estimated fair value. Based on the aforementioned analysis, the estimated fair value of our reporting units substantially exceeded the carrying value of the reporting units. Fair value determinations require considerable judgment and are sensitive to changes in underlying assumptions, estimates and market factors. The discount rate, profitability assumptions and terminal growth rate of our reporting units and the cyclical nature of the chlor alkali industry were the material assumptions utilized in the discounted cash flow model used to estimate the fair value of each reporting unit. The discount rate reflects a weighted-average cost of capital, which is calculated based on observable market data. Some of this data (such as the risk free or treasury rate and the pretax cost of debt) are based on the market data at a point in time. Other data (such as the equity risk premium) are based upon market data over time for a peer group of companies in the chemical manufacturing or distribution industries with a market capitalization premium added, as applicable. The discounted cash flow analysis requires estimates, assumptions and judgments about future events. Our analysis uses our internally generated long-range plan. Our discounted cash flow analysis uses the assumptions in our long-range plan about terminal growth rates, forecasted capital expenditures and changes in future working capital requirements to determine the implied fair value of each reporting unit. The long-range plan reflects management judgment, supplemented by independent chemical industry analyses which provide multi-year industry operating and pricing forecasts. We believe the assumptions used in our goodwill impairment analysis are appropriate and result in reasonable estimates of the implied fair value of each reporting unit. However, given the economic environment and the uncertainties regarding the impact on our business, there can be no assurance that our estimates and assumptions, made for purposes of our goodwill impairment testing, will prove to be an accurate prediction of the future. In order to evaluate the sensitivity of the fair value calculation on the goodwill impairment test, we applied a hypothetical 10% decrease to the fair value of each reporting unit. We also applied a hypothetical decrease of 100-basis points in our terminal growth rate or an increase of 100-basis points in our weighted-average cost of capital to test the fair value calculation. In all cases, the estimated fair value of our reporting units derived in these sensitivity calculations exceeded the carrying value in excess of 10%. If our assumptions regarding future performance are not achieved, we may be required to record goodwill impairment charges in future periods. It is not possible at this time to determine if any such future impairment charge would result or, if it does, whether such charge would be material. See Note 11 “Goodwill and Intangible Assets” for additional information. Intangible Assets In conjunction with our acquisitions, we have obtained access to the customer contracts and relationships, trade names, acquired technology and other intellectual property of the acquired companies. These relationships are expected to provide economic benefit for future periods. Amortization expense is recognized on a straight-line basis over the estimated lives of the related assets. The amortization period of customer contracts and relationships, trade names, acquired technology and other intellectual property represents our best estimate of the expected usage or consumption of the economic benefits of the acquired assets, which is based on the company’s historical experience. Intangible assets with finite lives are reviewed for impairment when conditions indicate that the carrying values of the assets may not be recoverable. Circumstances that are considered as part of the qualitative assessment and could trigger a quantitative impairment test include, but are not limited to: a significant adverse change in the business climate; a significant adverse legal judgment including asset specific factors; adverse cash flow trends; an adverse action or assessment by a government agency; unanticipated competition; sustained decline in our stock price; and a significant restructuring charge within a reporting unit. See Note 11 “Goodwill and Intangible Assets” for additional information. Environmental Liabilities and Expenditures Accruals (charges to income) for environmental matters are recorded when it is probable that a liability has been incurred and the amount of the liability can be reasonably estimated, based upon current law and existing technologies. These amounts, which are not discounted and are exclusive of claims against third parties, are adjusted periodically as assessment and remediation efforts progress or additional technical or legal information becomes available. Environmental costs are capitalized if the costs increase the value of the property and/or mitigate or prevent contamination from future operations. See Note 21 “Environmental” for additional information. Income Taxes Deferred taxes are provided for differences between the financial statement and tax basis of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. A valuation allowance is provided to offset deferred tax assets if, based on the available evidence, it is more likely than not that some or all of the value of the deferred tax assets will not be realized. See Note 15 “Income Taxes” for additional information. 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. We use hedge accounting treatment for a significant amount of our business transactions whose risks are covered using derivative instruments. The hedge accounting treatment provides for the deferral of gains or losses on derivative instruments until such time as the related transactions occur. See Note 24 “Derivative Financial Instruments” for additional information. Concentration of Credit Risk Accounts receivable is the principal financial instrument which subjects us to a concentration of credit risk. Credit is extended based upon the evaluation of a customer’s financial condition and, generally, collateral is not required. Concentrations of credit risk with respect to receivables are somewhat limited due to our large number of customers, the diversity of these customers’ businesses and the geographic dispersion of such customers. Our accounts receivable are predominantly derived from sales denominated in USD or the Euro. We maintain an allowance for doubtful accounts based upon the expected collectibility of all trade receivables. Fair Value 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 consolidated 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. 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 December 31, 2023 and 2022, the fair value measurements of debt were $2,626.2 million and $2,517.7 million, respectively. 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 measured at fair value on a nonrecurring basis as of December 31, 2023 and 2022. Retirement-Related Benefits We account for our defined benefit pension plans and non-pension postretirement benefit plans using actuarial models required by ASC 715 “Compensation—Retirement Benefits”. These models use an attribution approach that generally spreads the financial impact of changes to the plan and actuarial assumptions over the average remaining service lives of the employees in the plan. Changes in liability due to changes in actuarial assumptions such as discount rate, rate of compensation increases an

BUSINESS COMBINATIONS AND ASSET

BUSINESS COMBINATIONS AND ASSET ACQUISITIONS	12 Months Ended
	Dec. 31, 2023
Business Combination and Asset Acquisition [Abstract]
Business Combination Disclosure [Text Block]	NOTE 4. ACQUISITIONS On October 1, 2023, Olin acquired the assets of White Flyer Targets, LLC (“White Flyer”) from Reagent Diversified Holdings, Inc. for $63.9 million, subject to normal post-closing adjustments. The acquisition was financed with cash on hand. White Flyer designs, manufactures and sells recreational trap, skeet, international and sporting clay targets and has been included in Olin’s Winchester segment. We recorded the preliminary aggregate excess purchase price over identifiable net tangible and intangible assets acquired and liabilities assumed, which included a preliminary allocation of $2.7 million of goodwill allocated to our Winchester segment and $4.5 million of intangible assets subject to amortization. The preliminary total assets acquired, excluding goodwill and intangibles, and liabilities assumed amounted to $66.9 million and $10.2 million, respectively. The acquisition is not material, and therefore, supplemental pro forma financial information is not provided.

RECENT ACCOUNTING PRONOUNCEMENT

RECENT ACCOUNTING PRONOUNCEMENTS	12 Months Ended
	Dec. 31, 2023
Accounting Standards Update and Change in Accounting Principle [Abstract]
RECENT ACCOUNTING PRONOUNCEMENTS	NOTE 3. RECENT ACCOUNTING PRONOUNCEMENTS 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 the Company’s 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 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 are currently evaluating the impact of the standard on our consolidated financial statements and disclosures. In July 2023, the SEC adopted the final rule under SEC Release No. 33-11216, Cybersecurity Risk Management, Strategy, Governance, and Incident Disclosure , requiring disclosure of material cybersecurity incidents on Form 8-K and periodic disclosure of a registrant’s cybersecurity risk management, strategy and governance in annual reports. We adopted the Regulation S-K Item 6 disclosure requirements during the fourth quarter of 2023 and the Form 8-K incident disclosure requirements went into effect for us on December 18, 2023. The adoption of this final rule did not have a material impact on our consolidated financial statements and the additional disclosure requirements were included within Item 1C. Cybersecurity

RESTRUCTURING CHARGES

RESTRUCTURING CHARGES	12 Months Ended
	Dec. 31, 2023
Restructuring and Related Activities [Abstract]
RESTRUCTURING CHARGES	NOTE 5. 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. For the year ended December 31, 2023 and 2022, we recorded pretax restructuring charges of $73.4 million and $8.0 million, respectively, for the write-off of equipment and facility costs, employee severance and related benefit costs, contract termination costs and facility exit costs related to these actions. We expect to incur additional restructuring charges through 2025 of approximately $25 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. For the years ended December 31, 2023, 2022 and 2021, we recorded pretax restructuring charges of $4.7 million, $8.3 million and $5.6 million, respectively, for write-off of equipment and facility costs, lease and other contract termination costs and for facility exit costs related to this action. We expect to incur additional restructuring charges through 2027 of approximately $20 million related to these actions. Olin committed to a productivity initiative to align the organization with our strategic operating model and improve efficiencies (collectively, Productivity Plan). These actions and related activities were completed during the second quarter of 2021. For the year ended December 31, 2021, we recorded pretax restructuring charges of $10.3 million for employee severance and related benefit costs related to these actions. We do not expect to incur additional restructuring charges related to these actions. On January 18, 2021, we announced we had made the decision to permanently close our trichloroethylene and anhydrous hydrogen chloride liquefaction facilities in Freeport, TX (collectively, Freeport 2021 Plan), which were completed in the fourth quarter of 2021. For the years ended December 31, 2023, 2022 and 2021, we recorded pretax restructuring charges of $4.0 million, $2.6 million and $6.5 million, respectively, for facility exit costs related to these actions. We expect to incur additional restructuring charges through 2025 of approximately $10 million related to these actions. On December 11, 2019, we announced that we had made the decision to permanently close a chlor alkali plant with a capacity of 230,000 tons and our vinylidene chloride (VDC) production facility, both in Freeport, TX (collectively, Freeport 2019 Plan). The VDC facility and related chlor alkali plant were closed during the fourth quarter of 2020 and second quarter of 2021, respectively. For the years ended December 31, 2023, 2022 and 2021, we recorded pretax restructuring charges of $7.5 million, $6.0 million and $3.9 million, respectively, for facility exit costs related to these actions. We expect to incur additional restructuring charges through 2026 of approximately $15 million related to these actions. On March 21, 2016, we announced that we had made the decision to close a combined total of 433,000 tons of chlor alkali capacity across three separate locations (collectively, Chlor Alkali 2016 Plan). For the years ended December 31, 2022 and 2021, we recorded pretax restructuring charges of $0.4 million and $1.6 million, respectively, for the lease and other contract termination costs and facility exit costs related to these actions. We do not expect to incur additional restructuring charges related to these capacity reductions. The following table summarizes the 2023, 2022 and 2021 activities by major component of these restructuring actions and the remaining balances of accrued restructuring costs as of December 31, 2023, 2022 and 2021: Employee Severance and Related Benefit Costs Lease and Other Contract Termination Costs Facility Exit Costs Write-off of Equipment and Facility Total ($ in millions) Balance at January 1, 2021 $ 1.8 $ 1.7 $ — $ — $ 3.5 Restructuring charges 10.3 6.0 11.6 — 27.9 Amounts utilized (5.2) (2.3) (11.6) — (19.1) Balance at December 31, 2021 6.9 5.4 — — 12.3 Restructuring charges 7.4 1.1 13.5 3.3 25.3 Amounts utilized (4.9) (2.3) (13.5) (3.3) (24.0) Balance at December 31, 2022 9.4 4.2 — — 13.6 Restructuring charges 8.4 29.1 34.4 17.7 89.6 Amounts utilized (7.0) (16.6) (34.4) (17.7) (75.7) Balance at December 31, 2023 $ 10.8 $ 16.7 $ — $ — $ 27.5 The following table summarizes the cumulative restructuring charges of these restructuring actions by major component through December 31, 2023: Chlor Alkali Products and Vinyls Epoxy Corporate/Other Total McIntosh Plan Freeport 2021 Plan Freeport 2019 Plan Chlor Alkali 2016 Plan Epoxy Optimization Plan Productivity Plan ($ in millions) Write-off of equipment and facility $ 2.7 $ — $ 58.9 $ 78.1 $ 18.3 $ — $ 158.0 Employee severance and related benefit costs — — 2.1 6.7 15.8 10.3 34.9 Facility exit costs 9.5 13.1 19.1 53.2 18.2 — 113.1 Employee relocation costs — — — 1.7 — — 1.7 Lease and other contract termination costs 6.4 — — 43.0 29.1 — 78.5 Total cumulative restructuring charges $ 18.6 $ 13.1 $ 80.1 $ 182.7 $ 81.4 $ 10.3 $ 386.2 As of December 31, 2023, we have incurred cash expenditures of $200.7 million and non-cash charges of $158.0 million related to these restructuring actions. The remaining balance of $27.5 million is expected to be paid out through 2028.

EARNINGS PER SHARE

EARNINGS PER SHARE	12 Months Ended
	Dec. 31, 2023
Earnings Per Share [Abstract]
EARNINGS PER SHARE	NOTE 6. EARNINGS PER SHARE Basic and diluted net income (loss) per share are computed by dividing net income (loss) by the weighted-average number of common shares outstanding. Diluted net income (loss) per share reflects the dilutive effect of stock-based compensation. Years ended December 31, 2023 2022 2021 Computation of Net Income per Share (In millions, except per share data) Net income $ 452.0 $ 1,326.9 $ 1,296.7 Net loss attributable to noncontrolling interests (8.2) — — Net income attributable to Olin Corporation 460.2 1,326.9 1,296.7 Basic shares 125.9 144.9 159.1 Basic net income attributable to Olin Corporation per share $ 3.66 $ 9.16 $ 8.15 Diluted shares: Basic shares 125.9 144.9 159.1 Stock-based compensation 2.9 3.6 3.9 Diluted shares 128.8 148.5 163.0 Diluted net income attributable to Olin Corporation per share $ 3.57 $ 8.94 $ 7.96 The computation of dilutive shares from stock-based compensation does not include 1.2 million, 0.8 million and 0.1 million shares in 2023, 2022 and 2021, respectively, as their effect would have been anti-dilutive.

ACCOUNTS RECEIVABLES

ACCOUNTS RECEIVABLES	12 Months Ended
	Dec. 31, 2023
Receivables [Abstract]
ACCOUNTS RECEIVABLES	NOTE 7. 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 December 31, 2023 and 2022, we had $328.5 million and $300.0 million drawn under the agreement. As of December 31, 2023, $456.6 million of our trade receivables were pledged as collateral and we had $33.3 million of additional borrowing capacity under the Receivables Financing Agreement, which was limited by our borrowing base. Olin also has trade accounts receivable factoring arrangements (AR Facilities) and pursuant to the terms of the AR Facilities, certain of our domestic subsidiaries may sell their accounts receivable up to a maximum of $175.5 million and certain of our foreign subsidiaries may sell their accounts receivable up to a maximum of €22.0 million. We will continue to service the outstanding accounts sold. These receivables qualify for sales treatment under ASC 860 “Transfers and Servicing” and, accordingly, the proceeds are included in net cash provided by operating activities in the consolidated statements of cash flows. The following table summarizes the AR Facilities activity: December 31, 2023 2022 AR Facilities ($ in millions) Beginning balance $ 111.8 $ 83.3 Gross receivables sold 899.0 1,049.7 Payments received from customers on sold accounts (947.5) (1,021.2) Ending balance $ 63.3 $ 111.8 The factoring discount paid under the AR Facilities is recorded as interest expense on the consolidated statements of operations. The factoring discount for the years ended December 31, 2023 and 2022 was $4.7 million and $3.1 million, respectively. The agreements are without recourse, and therefore, no recourse liability has been recorded as of December 31, 2023. Our consolidated balance sheets included an allowance for doubtful accounts receivables of $13.1 million and $12.6 million and other receivables of $85.3 million and $71.6 million at December 31, 2023 and 2022, respectively, which were included in receivables, net.

INVENTORIES

INVENTORIES	12 Months Ended
	Dec. 31, 2023
Inventory Disclosure [Abstract]
INVENTORIES	NOTE 8. INVENTORIES December 31, 2023 2022 Inventories ($ in millions) Supplies $ 160.3 $ 137.6 Raw materials 171.1 201.2 Work in process 153.5 199.6 Finished goods 507.6 559.3 Inventories excluding LIFO reserve 992.5 1,097.7 LIFO reserve (133.7) (155.8) Inventories, net $ 858.8 $ 941.9 Inventories valued using the LIFO method comprised 56% and 59% of the total inventories at December 31, 2023 and 2022, respectively. The replacement cost of our inventories would have been approximately $133.7 million and $155.8 million higher than that reported at December 31, 2023 and 2022, respectively.

PROPERTY, PLANT AND EQUIPMENT

PROPERTY, PLANT AND EQUIPMENT	12 Months Ended
	Dec. 31, 2023
Property, Plant and Equipment [Abstract]
PROPERTY, PLANT AND EQUIPMENT	NOTE 9. PROPERTY, PLANT AND EQUIPMENT December 31, Useful Lives 2023 2022 Property Plant and Equipment ($ in millions) Land and improvements to land 10-20 Years (1) $ 283.1 $ 283.5 Buildings and building equipment 10-30 Years 442.7 412.0 Machinery and equipment 3-20 Years 6,410.5 6,181.1 Leasehold improvements 3-11 Years 8.5 8.5 Construction in progress 201.2 202.1 Property, plant and equipment 7,346.0 7,087.2 Accumulated depreciation (4,826.4) (4,413.1) Property, plant and equipment, net $ 2,519.6 $ 2,674.1 (1) Useful life is exclusive to land improvements. The weighted-average useful life of machinery and equipment at December 31, 2023, was 11 years. Depreciation expense was $421.8 million, $469.9 million and $443.3 million for 2023, 2022 and 2021, respectively. Interest capitalized was $2.8 million, $3.1 million and $3.2 million for 2023, 2022 and 2021, respectively. The consolidated statements of cash flows for the years ended December 31, 2023, 2022 and 2021, included an increase (decrease) of $5.3 million, $(4.2) million and $6.4 million, respectively, to capital expenditures, with the corresponding change to accounts payable and accrued liabilities, related to purchases of property, plant and equipment included in accounts payable and accrued liabilities at December 31, 2023, 2022 and 2021.

OTHER ASSETS

OTHER ASSETS	12 Months Ended
	Dec. 31, 2023
Other Assets [Abstract]
OTHER ASSETS	NOTE 10. OTHER ASSETS Included in other assets were the following: December 31, 2023 2022 Other Assets ($ in millions) Supply contracts $ 1,061.8 $ 1,048.0 Other 56.7 54.5 Other assets $ 1,118.5 $ 1,102.5 For the year ended December 31, 2023 and 2022, payments of $64.5 million and $37.7 million, respectively, were made under other long-term supply contracts for energy modernization projects on the U.S. Gulf Coast. The weighted-average useful life of long-term supply contracts at December 31, 2023, was 20 years. For the years ended December 31, 2023, 2022 and 2021, amortization expense of $71.2 million, $70.4 million and $69.4 million, respectively, was recognized within cost of goods sold related to our supply contracts and is reflected in depreciation and amortization on the consolidated statements of cash flows.

GOODWILL AND INTANGIBLE ASSETS

GOODWILL AND INTANGIBLE ASSETS	12 Months Ended
	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND INTANGIBLE ASSETS	NOTE 11. 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, 2022 (1) $ 1,275.6 $ 145.0 $ — $ 1,420.6 Foreign currency translation adjustment 0.2 0.1 — 0.3 Balance at December 31, 2022 (1) 1,275.8 145.1 — 1,420.9 Goodwill acquired during the year — — 2.7 2.7 Foreign currency translation adjustment 0.3 0.1 — 0.4 Balance at December 31, 2023 (1) $ 1,276.1 $ 145.2 $ 2.7 $ 1,424.0 (1) Includes cumulative goodwill impairment of $557.6 million and $142.2 million in Chlor Alkali Products and Vinyls and Epoxy, respectively. Intangible assets consisted of the following: December 31, 2023 2022 Useful Lives Gross Amount Accumulated Amortization Net Gross Amount Accumulated Amortization Net Intangible Assets ($ in millions) Customers, customer contracts and relationships 10-15 Years $ 671.7 $ (437.5) $ 234.2 $ 669.1 $ (401.2) $ 267.9 Trade names 7 Years 3.6 (0.2) 3.4 — — — Acquired technology 4-7 Years 94.4 (90.4) 4.0 93.1 (88.3) 4.8 Other 10 Years 4.9 (0.7) 4.2 1.8 (0.7) 1.1 Total intangible assets $ 774.6 $ (528.8) $ 245.8 $ 764.0 $ (490.2) $ 273.8 Amortization expense relating to intangible assets was $37.0 million, $55.3 million and $63.1 million in 2023, 2022 and 2021, respectively. Estimated amortization expense relating to intangible assets for the subsequent five-year periods are as follows: Estimated Amortization Expense ($ in millions) 2024 $ 37.6 2025 37.2 2026 35.5 2027 35.4 2028 35.2 During the fourth quarter of 2023, we performed our qualitative assessment of our intangible assets. Based on our qualitative impairment assessment, it is more likely than not that the fair value of our intangible assets is greater than the carrying amount as of December 31, 2023. No impairment on our intangible assets was recorded in 2023, 2022 or 2021.

DEBT

DEBT	12 Months Ended
	Dec. 31, 2023
Debt Instruments [Abstract]
DEBT	NOTE 12. DEBT December 31, 2023 2022 Financing Obligations ($ in millions) Variable-rate Term Loan Facility, due 2027 (6.955% and 5.923% at December 31, 2023 and 2022, respectively) $ 341.3 $ 350.0 Variable-rate Senior Revolving Credit Facility, due 2027 (6.955% at December 31, 2023) 68.0 — Variable-rate Recovery Zone bonds, due 2024-2035 (6.420% and 5.198% at December 31, 2023 and 2022, respectively) 103.0 103.0 Variable-rate Go Zone bonds, due 2024 (6.420% and 5.198% at December 31, 2023 and 2022, respectively) 50.0 50.0 Variable-rate industrial development and environmental improvement obligations, due 2025 (6.45% and 4.55% at December 31, 2023 and 2022, respectively) 2.9 2.9 9.50% senior notes, due 2025 108.6 108.6 5.625% senior notes, due 2029 669.3 669.3 5.125% senior notes, due 2027 500.0 500.0 5.00% senior notes, due 2030 515.3 515.3 Receivables Financing Agreement (See Note 7) 328.5 300.0 Finance lease obligations — 1.9 Other: Deferred debt issuance costs (16.6) (20.1) Unamortized bond original issue discount (0.2) (0.2) Total debt 2,670.1 2,580.7 Amounts due within one year 78.8 9.7 Total long-term debt $ 2,591.3 $ 2,571.0 Senior Credit Facility On October 11, 2022, we entered into a $1,550.0 million senior credit facility (Senior Credit Facility) that replaced our 2021 Senior Credit Facility. The Senior Credit Facility includes a senior term loan facility with aggregate commitments of $350.0 million (Term Loan Facility) and a senior revolving credit facility with aggregate commitments of $1,200.0 million (Senior Revolving Credit Facility). The Term Loan Facility was fully drawn on the closing date with the proceeds of the Term Loan Facility used to refinance the loans and commitments outstanding under the 2021 Senior Credit Facility. The Term Loan Facility requires principal amortization 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 December 31, 2023, we had $1,131.6 million available under our $1,200.0 million Senior Revolving Credit Facility because we had $68.0 million borrowed under the facility and issued $0.4 million of letters of credit. We were in compliance with all covenants and restrictions under all our outstanding credit agreements as of December 31, 2023, and no event of default had occurred that would permit the lenders under our outstanding credit agreements to accelerate the debt if not cured. In the future, our ability to generate sufficient operating cash flows, among other factors, will determine the amounts available to be borrowed under these facilities. As a result of our restrictive covenant related to the net leverage ratio, the maximum additional borrowings available to us could be limited in the future. The limitation, if an amendment or waiver from our lenders is not obtained, could restrict our ability to borrow the maximum amounts available under the Senior Revolving Credit Facility and the Receivables Financing Agreement. As of December 31, 2023, there were no covenants or other restrictions that limited our ability to borrow. Senior Notes and Other Financing During 2023 and 2022, activity of our outstanding debt included: Long-term Debt Borrowings (Repayments) for the Year Ended December 31, 2023 2022 Debt Instruments ($ in millions) Borrowings Senior Revolving Credit Facility $ 375.0 $ 320.0 Receivables Financing Agreement 332.7 95.0 Total borrowings 707.7 415.0 Repayments 5.50% senior notes, due 2022 (2022 Notes) — (200.0) Senior Revolving Credit Facility (307.0) (320.0) Term Loan Facility (8.7) — Receivables Financing Agreement (304.2) (95.0) Finance leases (1.9) (1.1) Total repayments (621.8) (616.1) Long-term debt borrowings (repayments), net $ 85.9 $ (201.1) We incurred a loss on debt extinguishment of $152.2 million during the year ended December 31, 2021, which is included as interest expense in the consolidated statements of operations. The loss includes the payment of bond redemption premiums of $137.7 million for the year ended December 31, 2021, as well as the write-off of deferred debt issuance costs, write-off of bond original issue discount and recognition of deferred fair value interest rate swap losses of $14.5 million for the year ended December 31, 2021, associated with the optional prepayment of existing debt. The cash payments related to the early redemption premiums for the debt extinguishments are classified as cash outflows from financing activities on the consolidated statements of cash flows for year ended December 31, 2021. During the year ended December 31, 2022, Olin redeemed the full aggregate principal amount $200.0 million of the outstanding 2022 Notes which became due utilizing cash on hand. For the years ended December 31, 2022 and 2021, we paid debt issuance costs of $4.4 million and $3.9 million, respectively, related to financing transactions. At December 31, 2023, we had $120.7 million in letters of credit outstanding, of which $0.4 million were issued under our Senior Revolving Credit Facility. The letters of credit are used to support certain long-term debt, workers compensation insurance policies, plant closure and post-closure obligations, international payment obligations and international pension funding requirements. Annual maturities of long-term debt are as follows: Expected Annual Maturities ($ in millions) 2024 $ 78.8 2025 457.5 2026 17.5 2027 865.5 2028 — Thereafter 1,267.6 Total $ 2,686.9

PENSION PLANS

PENSION PLANS	12 Months Ended
	Dec. 31, 2023
Retirement Benefits [Abstract]
PENSION PLANS	NOTE 13. PENSION PLANS 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). Based on our plan assumptions and estimates, we will not be required to make any cash contributions to the domestic qualified defined benefit pension plan at least through 2024. We have international qualified defined benefit pension plans to which we made cash contributions of $1.0 million, $1.3 million and $1.1 million in 2023, 2022 and 2021, respectively, and we anticipate less than $5 million of cash contributions to international qualified defined benefit pension plans in 2024. Pension Obligations and Funded Status Changes in the benefit obligation and plan assets were as follows: December 31, 2023 December 31, 2022 U.S. Foreign Total U.S. Foreign Total Change in Benefit Obligation ($ in millions) Benefit obligation - beginning of year $ 1,868.4 $ 251.1 $ 2,119.5 $ 2,506.0 $ 382.3 $ 2,888.3 Service cost 0.3 5.4 5.7 0.5 7.9 8.4 Interest cost 96.3 9.1 105.4 57.3 4.1 61.4 Actuarial loss (gain) 47.1 14.9 62.0 (556.1) (113.7) (669.8) Benefits paid (141.0) (5.9) (146.9) (139.3) (6.1) (145.4) Plan participant’s contributions — 0.2 0.2 — 0.3 0.3 Settlements — (7.5) (7.5) — — — Foreign currency translation adjustments — 9.8 9.8 — (23.7) (23.7) Benefit obligation - end of year $ 1,871.1 $ 277.1 $ 2,148.2 $ 1,868.4 $ 251.1 $ 2,119.5 December 31, 2023 December 31, 2022 U.S. Foreign Total U.S. Foreign Total Change in Plan Assets ($ in millions) Fair value of plan assets - beginning of year $ 1,824.9 $ 63.3 $ 1,888.2 $ 2,429.6 $ 76.1 $ 2,505.7 Actual return on plans’ assets 173.1 4.0 177.1 (465.6) (7.6) (473.2) Employer contributions 0.2 1.0 1.2 0.2 1.4 1.6 Benefits paid (141.0) (2.8) (143.8) (139.3) (3.1) (142.4) Settlements — (7.1) (7.1) — — — Foreign currency translation adjustments — 2.4 2.4 — (3.5) (3.5) Fair value of plan assets - end of year $ 1,857.2 $ 60.8 $ 1,918.0 $ 1,824.9 $ 63.3 $ 1,888.2 December 31, 2023 December 31, 2022 U.S. Foreign Total U.S. Foreign Total Funded Status ($ in millions) Qualified plans $ (11.9) $ (214.6) $ (226.5) $ (41.4) $ (185.7) $ (227.1) Non-qualified plans (2.0) (1.7) (3.7) (2.1) (2.1) (4.2) Total funded status $ (13.9) $ (216.3) $ (230.2) $ (43.5) $ (187.8) $ (231.3) We recorded a $11.9 million after-tax charge ($16.4 million pretax) to shareholders’ equity as of December 31, 2023, for our pension plans. This charge primarily reflected a 30-basis point decrease in the domestic pension plans’ discount rate and a 50-basis point decrease in the international defined benefit pension plans’ discount rate, partially offset by a favorable performance on plan assets during 2023. In 2022, we recorded a $37.2 million after-tax benefit ($59.9 million pretax) to shareholders’ equity as of December 31, 2022, for our pension plans. This benefit primarily reflected a 260-basis point increase in the domestic pension plans’ discount rate and a 230-basis point increase in the international defined benefit pension plans’ discount rate, partially offset by unfavorable performance on plan assets during 2022. The $62.0 million actuarial loss for 2023 was primarily due to a 30-basis point decrease in the domestic pension plans’ discount rate and a 50-basis point decrease in the international defined benefit pension plans’ discount rate. The $669.8 million actuarial gain for 2022 was primarily due to a 260-basis point increase in the domestic pension plans’ discount rate and a 230-basis point increase in the international defined benefit pension plans’ discount rate. Amounts recognized in the consolidated balance sheets consisted of: December 31, 2023 December 31, 2022 U.S. Foreign Total U.S. Foreign Total ($ in millions) Prepaid benefit cost in noncurrent assets $ — $ 1.8 $ 1.8 $ — $ 3.9 $ 3.9 Accrued benefit in current liabilities (0.6) (5.6) (6.2) (0.5) (0.2) (0.7) Accrued benefit in noncurrent liabilities (13.3) (212.5) (225.8) (43.0) (191.5) (234.5) Accumulated other comprehensive loss 558.3 (5.4) 552.9 558.1 (21.4) 536.7 Net balance sheet impact $ 544.4 $ (221.7) $ 322.7 $ 514.6 $ (209.2) $ 305.4 At December 31, 2023 and 2022, the benefit obligation of non-qualified pension plans was $3.7 million and $4.2 million, respectively, and was included in the above pension benefit obligation. There were no plan assets for these non-qualified pension plans. At December 31, 2023, future benefit payments for qualified and non-qualified plans were as follows: Non-qualified Plans Qualified Plans Expected Benefit Payments ($ in millions) 2024 $ 0.6 $ 152.2 2025 0.4 143.6 2026 0.4 137.8 2027 0.3 132.3 2028 0.2 126.0 December 31, 2023 2022 ($ in millions) Projected benefit obligation $ 2,148.2 $ 2,119.5 Accumulated benefit obligation 2,131.7 2,107.5 Fair value of plans’ assets 1,918.0 1,888.2 Years Ended December 31, 2023 2022 2021 Components of Net Periodic Benefit Income ($ in millions) Service cost $ 5.7 $ 8.4 $ 11.4 Interest cost 105.4 61.4 51.3 Expected return on plans’ assets (131.4) (136.7) (142.3) Amortization of prior service cost (0.4) (0.7) (0.6) Recognized actuarial loss — 34.6 52.7 Net periodic benefit income $ (20.7) $ (33.0) $ (27.5) Years Ended December 31, 2023 2022 2021 Included in Pretax Other Comprehensive Income (Loss) ($ in millions) Liability adjustment $ 16.4 $ (59.9) $ (245.9) Amortization of prior service costs and actuarial losses 0.4 (33.9) (52.1) The service cost component of net periodic benefit (income) cost related to the employees of the operating segments are allocated to the operating segments based on their respective estimated census data. Pension Plan Assumptions Certain actuarial assumptions, such as discount rate and long-term rate of return on plan assets, have a significant effect on the amounts reported for net periodic benefit cost and accrued benefit obligation amounts. We use a measurement date of December 31 for our pension plans. U.S. Pension Benefits Foreign Pension Benefits Weighted-average Assumptions 2023 2022 2021 2023 2022 2021 Discount rate—periodic benefit cost 5.50 % (1) 2.90 % 2.40 % 3.70 % 1.40 % 0.80 % Expected return on plans’ assets 6.75 % 6.75 % 7.25 % 4.40 % 3.80 % 4.20 % Rate of compensation increase 3.00 % 3.00 % 3.00 % 3.40 % 3.00 % 3.00 % Discount rate—benefit obligation 5.20 % 5.50 % 2.90 % 3.20 % 3.70 % 1.40 % (1) The discount rate—periodic benefit cost for our domestic qualified pension plan is comprised of the discount rate used to determine interest costs of 5.3% and the discount rate used to determine service costs of 5.5%. The discount rate is based on a hypothetical yield curve represented by a series of annualized individual zero-coupon bond spot rates for maturities ranging from one-half to thirty years. The bonds used in the yield curve must have a rating of AA or better per Standard & Poor’s, be non-callable, and have at least $250 million par outstanding. The yield curve is then applied to the projected benefit payments from the plan. Based on these bonds and the projected benefit payment streams, the single rate that produces the same yield as the matching bond portfolio is used as the discount rate. The long-term expected rate of return on plan assets represents an estimate of the long-term rate of returns on the investment portfolio consisting of equities, fixed income and alternative investments. We use long-term historical actual return information, the allocation mix of investments that comprise plan assets and forecast estimates of long-term investment returns, including inflation rates, by reference to external sources. The historical rates of return on plan assets have been 6.7% for the last 5 years, 6.7% for the last 10 years and 7.8% for the last 15 years. The following rates of return by asset class were considered in setting the long-term rate of return assumption: Asset Class Rate of Return U.S. equities 7% to 11% Non-U.S. equities 8% to 12% Fixed income/cash 3% to 7% Alternative investments 5% to 15% Plan Assets Our pension plan asset allocations at December 31, 2023 and 2022 by asset class were as follows: Percentage of Plan Assets Asset Class 2023 2022 U.S. equities 3 % 4 % Non-U.S. equities 4 % 11 % Fixed income/cash 50 % 38 % Alternative investments 43 % 47 % The Alternative Investments asset class includes hedge funds, real estate and private equity investments. The Alternative Investments class is intended to help diversify risk and increase returns by utilizing a broader group of assets. A master trust was established by our pension plan to accumulate funds required to meet benefit payments of our plan and is administered solely in the interest of our plan’s participants and their beneficiaries. The master trust’s investment horizon is long term. Its assets are managed by professional investment managers or invested in professionally managed investment vehicles. Our pension plan maintains a portfolio of assets designed to achieve an appropriate risk adjusted return. The portfolio of assets is also structured to manage risk by diversifying assets across asset classes whose return patterns are not highly correlated, investing in passively and actively managed strategies and in value and growth styles, and by periodic rebalancing of asset classes, strategies and investment styles to objectively set targets. As of December 31, 2023, the following target allocation and ranges have been set for each asset class: Asset Class Target Allocation Target Range U.S. equities (1) 15 % 5-25 Non-U.S. equities (1) 10 % 0-30 Fixed income/cash (1) 75 % 30-95 Alternative investments — % 0-30 (1) The target allocation for these asset classes includes alternative investments, primarily hedge funds, based on the underlying investments in each hedge fund. Determining which hierarchical level an asset or liability falls within requires significant judgment. The following table summarizes our domestic and foreign defined benefit pension plans assets measured at fair value as of December 31, 2023: Asset Class Investments Measured at Net Asset Value Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Total Equity Securities ($ in millions) U.S. equities $ 12.2 $ 36.6 $ — $ — $ 48.8 Non-U.S. equities 85.4 0.1 0.5 — 86.0 Fixed Income/Cash Cash — 227.7 — — 227.7 Government treasuries — — 244.9 — 244.9 Corporate debt instruments 286.3 — 0.5 — 286.8 Asset-backed securities 192.7 — 14.8 — 207.5 Alternative Investments Hedge fund of funds 599.5 — — — 599.5 Real estate funds 20.1 — — — 20.1 Private equity funds 196.7 — — — 196.7 Total assets $ 1,392.9 $ 264.4 $ 260.7 $ — $ 1,918.0 The following table summarizes our domestic and foreign defined benefit pension plans assets measured at fair value as of December 31, 2022: Asset Class Investments Measured at Net Asset Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs Significant Unobservable Inputs Total Equity Securities ($ in millions) U.S. equities $ 19.2 $ 54.4 $ — $ — $ 73.6 Non-U.S. equities 206.4 0.2 0.1 — 206.7 Fixed Income/Cash Cash — 102.2 — — 102.2 Government treasuries — — 171.2 — 171.2 Corporate debt instruments 345.2 — 0.5 — 345.7 Asset-backed securities 90.1 — 19.0 — 109.1 Alternative Investments Hedge fund of funds 685.1 — — — 685.1 Real estate funds 25.2 — — — 25.2 Private equity funds 169.4 — — — 169.4 Total assets $ 1,540.6 $ 156.8 $ 190.8 $ — $ 1,888.2 U.S. equities —This class included actively and passively managed equity investments in common stock and commingled funds comprised primarily of large-capitalization stocks with value, core and growth strategies. Non-U.S. equities —This class included actively managed equity investments in commingled funds comprised primarily of international large-capitalization stocks from both developed and emerging markets. Fixed income and cash— This class included commingled funds comprised of debt instruments issued by the U.S. and Canadian Treasuries, U.S. Agencies, corporate debt instruments, asset- and mortgage-backed securities and cash. Hedge fund of funds— This class included a hedge fund which invests in the following types of hedge funds: Event driven hedge funds— This class included hedge funds that invest in securities to capture excess returns that are driven by market or specific company events including activist investment philosophies and the arbitrage of equity and private and public debt securities. Market neutral hedge funds —This class included investments in U.S. and international equities and fixed income securities while maintaining a market neutral position in those markets. Other hedge funds —This class primarily included long-short equity strategies and a global macro fund which invested in fixed income, equity, currency, commodity and related derivative markets. Real estate funds —This class included several funds that invest primarily in U.S. commercial real estate. Private equity funds —This class included several private equity funds that invest primarily in infrastructure and U.S. power generation and transmission assets.

POSTRETIREMENT BENEFITS

POSTRETIREMENT BENEFITS	12 Months Ended
	Dec. 31, 2023
POSTRETIREMENT BENEFITS Disclosure [Abstract]
POSTRETIREMENT BENEFITS	NOTE 14. POSTRETIREMENT BENEFITS We 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. We use a measurement date of December 31 for our postretirement plans. Other Postretirement Benefits Obligations and Funded Status Changes in the benefit obligation were as follows: December 31, 2023 December 31, 2022 U.S. Foreign Total U.S. Foreign Total Change in Benefit Obligation ($ in millions) Benefit obligation - beginning of year $ 28.5 $ 6.4 $ 34.9 $ 39.3 $ 11.2 $ 50.5 Service cost 0.6 0.1 0.7 0.8 0.3 1.1 Interest cost 1.4 0.4 1.8 0.8 0.3 1.1 Actuarial loss (gain) 1.5 0.2 1.7 (8.0) (4.2) (12.2) Benefits paid (3.8) (0.3) (4.1) (4.4) (0.4) (4.8) Foreign currency translation adjustments — 0.2 0.2 — (0.8) (0.8) Benefit obligation - end of year $ 28.2 $ 7.0 $ 35.2 $ 28.5 $ 6.4 $ 34.9 December 31, 2023 December 31, 2022 U.S. Foreign Total U.S. Foreign Total ($ in millions) Funded status $ (28.2) $ (7.0) $ (35.2) $ (28.5) $ (6.4) $ (34.9) We recorded a $1.3 million after-tax charge ($1.7 million pretax) to shareholders’ equity as of December 31, 2023, for our other postretirement plans. In 2022, we recorded an after-tax benefit of $9.6 million ($12.2 million pretax) to shareholders’ equity as of December 31, 2022, for our other postretirement plans. Amounts recognized in the consolidated balance sheets consisted of: December 31, 2023 December 31, 2022 U.S. Foreign Total U.S. Foreign Total ($ in millions) Accrued benefit in current liabilities $ (2.4) $ (0.3) $ (2.7) $ (2.6) $ (0.3) $ (2.9) Accrued benefit in noncurrent liabilities (25.8) (6.7) (32.5) (25.9) (6.1) (32.0) Accumulated other comprehensive loss 11.0 (2.7) 8.3 10.3 (3.1) 7.2 Net balance sheet impact $ (17.2) $ (9.7) $ (26.9) $ (18.2) $ (9.5) $ (27.7) Years Ended December 31, 2023 2022 2021 Components of Net Periodic Benefit Cost ($ in millions) Service cost $ 0.7 $ 1.1 $ 1.3 Interest cost 1.8 1.1 1.0 Amortization of prior service cost 0.1 0.1 0.1 Recognized actuarial loss 0.5 1.5 2.1 Net periodic benefit cost $ 3.1 $ 3.8 $ 4.5 Years Ended December 31, 2023 2022 2021 Included in Pretax Other Comprehensive Income (Loss) ($ in millions) Liability adjustment $ 1.7 $ (12.2) $ (3.8) Amortization of prior service costs and actuarial losses (0.6) (1.6) (2.2) The service cost component of net periodic postretirement benefit cost related to the employees of the operating segments are allocated to the operating segments based on their respective estimated census data. Other Postretirement Benefits Plan Assumptions Certain actuarial assumptions, such as discount rate, have a significant effect on the amounts reported for net periodic benefit cost and accrued benefit obligation amounts. December 31, Weighted-Average Assumptions 2023 2022 2021 Discount rate—periodic benefit cost 5.5 % 2.8 % 2.3 % Discount rate—benefit obligation 5.2 % 5.5 % 2.8 % The discount rate is based on a hypothetical yield curve represented by a series of annualized individual zero-coupon bond spot rates for maturities ranging from one-half to thirty years. The bonds used in the yield curve must have a rating of AA or better per Standard & Poor’s, be non-callable, and have at least $250 million par outstanding. The yield curve is then applied to the projected benefit payments from the plan. Based on these bonds and the projected benefit payment streams, the single rate that produces the same yield as the matching bond portfolio is used as the discount rate. We review external data and our own internal trends for healthcare costs to determine the healthcare cost for the postretirement benefit obligation. The assumed healthcare cost trend rates for pre-65 retirees were as follows: December 31, 2023 2022 Healthcare cost trend rate assumed for next year 7.0 % 7.0 % Rate that the cost trend rate gradually declines to 4.5 % 4.5 % Year that the rate reaches the ultimate rate 2033 2032 For post-65 retirees, we provide a fixed dollar benefit, which is not subject to escalation. We expect to make payments of approximately $3 million for each of the next five years under the provisions of our other postretirement benefit plans.

INCOME TAXES

INCOME TAXES	12 Months Ended
	Dec. 31, 2023
Income Tax Disclosure [Abstract]
INCOME TAXES	NOTE 15. INCOME TAXES Years ended December 31, 2023 2022 2021 Components of Income (Loss) Before Taxes ($ in millions) U.S. $ 456.7 $ 1,231.2 $ 977.3 Foreign 102.6 444.8 561.4 Income before taxes $ 559.3 $ 1,676.0 $ 1,538.7 Components of Income Tax Provision (Benefit) Current: Federal $ 96.2 $ 225.0 $ 139.6 State 19.4 31.1 24.5 Foreign 48.0 121.7 131.3 Total current 163.6 377.8 295.4 Deferred: Federal (25.3) (32.1) 39.1 State (7.9) (4.3) 6.2 Foreign (23.1) 7.7 (98.7) Total deferred (56.3) (28.7) (53.4) Income tax provision $ 107.3 $ 349.1 $ 242.0 The following table accounts for the difference between the actual tax provision and the amounts obtained by applying the statutory U.S. federal income tax rate to the income (loss) before taxes. Years ended December 31, Effective Tax Rate Reconciliation (Percent) 2023 2022 2021 Statutory federal tax rate 21.0 % 21.0 % 21.0 % State income taxes, net 2.7 2.3 1.9 Foreign rate differential (1.8) 1.5 2.9 U.S. tax on foreign earnings 1.7 (0.8) 0.3 Salt depletion (1.7) (0.5) (0.6) Change in valuation allowance 2.0 0.4 (10.4) Remeasurement of U.S. state deferred taxes (0.2) (0.8) 0.1 Change in tax contingencies (0.5) 0.5 1.5 Share-based payments (1.0) (0.3) (0.7) Return to provision (3.1) (0.6) (0.5) U.S. federal tax credits — (0.1) — Legal entity liquidation (0.5) (2.0) — Other, net 0.6 0.2 0.2 Effective tax rate 19.2 % 20.8 % 15.7 % The effective tax rate for 2023 included benefits associated with a legal entity liquidation, prior year tax positions, stock-based compensation, remeasurement of deferred taxes due to a decrease in our state effective tax rates and foreign rate changes, and from a change in tax contingencies, and an expense from a net increase in the valuation allowance related to deferred tax assets in foreign jurisdictions. These factors resulted in a net $29.4 million tax benefit. Excluding these items, the effective tax rate for 2023 of 24.4% was higher than the 21.0% U.S. federal statutory rate primarily due to state taxes, an increase in the valuation allowance related to losses in foreign jurisdictions and foreign income inclusions, partially offset by foreign rate differential and favorable permanent salt depletion deductions. The effective tax rate for 2022 included benefits associated with a legal entity liquidation, prior year tax positions, stock-based compensation, and remeasurement of deferred taxes due to a decrease in our state effective tax rates, and expenses associated with a net increase in the valuation allowance related to state tax credits and a change in tax contingencies. These factors resulted in a net $60.2 million tax benefit. Excluding these items, the effective tax rate for 2022 of 24.4% was higher than the 21.0% U.S. federal statutory rate primarily due to state taxes, an increase in the valuation allowance related to losses in foreign jurisdictions and foreign income taxes, partially offset by foreign income exclusions and favorable permanent salt depletion deductions. The effective tax rate for 2021 included benefits from a net decrease in the valuation allowance related to deferred tax assets in foreign jurisdictions, domestic tax credits, prior year tax positions, stock-based compensation, and expenses from remeasurement of deferred taxes due to an increase in our state effective tax rates and a change in tax contingencies. These factors resulted in a net $103.6 million tax benefit. Excluding these items, the effective tax rate for 2021 of 22.5% was higher than the 21.0% U.S. federal statutory rate primarily due to state taxes, foreign income inclusions and foreign rate differential, partially offset by a net decrease in the valuation allowance related to utilization of losses in foreign jurisdictions and favorable permanent salt depletion deductions. December 31, 2023 2022 Components of Deferred Tax Assets and Liabilities ($ in millions) Deferred Tax Assets Pension and postretirement benefits $ 42.4 $ 42.9 Environmental reserves 38.3 37.4 Asset retirement obligations 16.6 13.9 Accrued liabilities 46.1 47.4 Lease liabilities 88.1 91.4 Tax credits 47.3 37.4 Net operating losses (NOL) 54.1 23.2 Other miscellaneous items 3.0 2.7 Total deferred tax assets 335.9 296.3 Valuation allowance (99.5) (76.4) Net deferred tax assets 236.4 219.9 Deferred Tax Liabilities Property, plant and equipment 439.5 481.7 Right-of-use lease assets 86.5 89.8 Intangible amortization 76.9 68.7 Inventory and prepaids 5.5 12.1 Taxes on unremitted earnings 16.8 12.0 Other miscellaneous items — 2.4 Total deferred tax liabilities 625.2 666.7 Net deferred income tax liability $ (388.8) $ (446.8) Realization of the net deferred tax assets, irrespective of indefinite-lived deferred tax liabilities, is dependent on future reversals of existing taxable temporary differences and adequate future taxable income, exclusive of reversing temporary differences and carryforwards. Although realization is not assured, we believe that it is more likely than not that the net deferred tax assets will be realized. At December 31, 2023, we had deferred state tax assets of $14.9 million relating to state NOLs, which will expire in years 2024 through 2042, if not utilized. At December 31, 2023, we had deferred state tax assets of $19.3 million relating to state tax credits, which will expire in years 2024 through 2038, if not utilized. At December 31, 2023, we had foreign tax credits of $23.1 million, that will expire in years 2027 through 2032, if not utilized. At December 31, 2023, we had NOLs of approximately $141.4 million (representing $39.1 million of deferred tax assets) in various foreign jurisdictions. Of these, $67.9 million (representing $16.9 million of deferred tax assets) expire in various years from 2024 to 2033. The remaining $73.5 million (representing $22.2 million of deferred tax assets) do not expire. As of December 31, 2023, we had recorded a valuation allowance of $99.5 million, compared to $76.4 million as of December 31, 2022, and $70.1 million as of December 31, 2021. The increase of $23.1 million in 2023 is primarily due to increases in valuation allowances on foreign tax credits and foreign NOLs. We continue to have net deferred tax assets in several jurisdictions which we expect to realize, assuming sufficient taxable income can be generated to utilize these deferred tax benefits, which is based on certain estimates and assumptions. If these estimates and related assumptions change in the future, we may be required to reduce the value of the deferred tax assets resulting in additional tax expense. The activity of our deferred income tax valuation allowance was as follows: December 31, 2023 2022 Deferred Income Tax Valuation Allowance ($ in millions) Beginning balance $ 76.4 $ 70.1 Increases to valuation allowances 23.6 14.6 Decreases to valuation allowances (0.1) (6.6) Foreign currency translation adjustments (0.4) (1.7) Ending balance $ 99.5 $ 76.4 As of December 31, 2023, we had $50.3 million of gross unrecognized tax benefits, which would have a net $49.9 million impact on the effective tax rate, if recognized. As of December 31, 2022, we had $51.6 million of gross unrecognized tax benefits, which would have a net $50.6 million impact on the effective tax rate, if recognized. The change for both 2023 and 2022 primarily relates to additional gross unrecognized benefits for current and prior year tax positions, as well as decreases for prior year tax positions. The amounts of unrecognized tax benefits were as follows: December 31, 2023 2022 Unrecognized Tax Benefits ($ in millions) Beginning balance $ 51.6 $ 43.4 Increase for current year tax positions 1.7 10.3 Increase for prior year tax positions 1.3 0.3 Decrease for prior year tax positions (0.5) (0.8) Reduction due to lapse in statute of limitations (5.1) — Foreign currency translation adjustments 1.3 (1.6) Ending balance $ 50.3 $ 51.6 We recognize interest and penalty expense related to unrecognized tax positions as a component of the income tax provision. As of December 31, 2023 and 2022, interest and penalties accrued were $1.9 million and $1.2 million, respectively. For 2023, 2022 and 2021, we recorded expense related to interest and penalties of $0.7 million, $0.7 million and $0.5 million, respectively. As of December 31, 2023, we believe it is reasonably possible that our total amount of unrecognized tax benefits will decrease by approximately $36.9 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 - 2022 U.S. state income tax 2012 - 2022 Canadian federal income tax 2015 - 2022 Brazil 2015 - 2022 Germany 2015 - 2022 China 2014 - 2022 The Netherlands 2015 - 2022

ACCRUED LIABILITIES

ACCRUED LIABILITIES	12 Months Ended
	Dec. 31, 2023
Accrued Liabilities, Current [Abstract]
ACCRUED LIABILITIES	NOTE 16. ACCRUED LIABILITIES Included in accrued liabilities were the following: December 31, 2023 2022 Accrued Liabilities ($ in millions) Accrued compensation and payroll taxes $ 72.0 $ 111.9 Non-income tax-related accruals 52.5 51.4 Accrued interest 35.8 35.6 Legal and professional costs 27.0 41.6 Accrued employee benefits 63.5 64.6 Contract liabilities (current portion only) 34.5 41.1 Environmental (current portion only) 32.0 25.0 Asset retirement obligation (current portion only) 9.5 13.7 Restructuring reserves (current portion only) 22.6 13.6 Derivative contracts 31.9 42.5 Other 68.7 67.8 Accrued liabilities $ 450.0 $ 508.8

CONTRIBUTING EMPLOYEE OWNERSHIP

CONTRIBUTING EMPLOYEE OWNERSHIP PLAN	12 Months Ended
	Dec. 31, 2023
Retirement Benefits [Abstract]
CONTRIBUTING EMPLOYEE OWNERSHIP PLAN	NOTE 17. CONTRIBUTING EMPLOYEE OWNERSHIP PLAN The Contributing Employee Ownership Plan (CEOP) is a defined contribution plan available to essentially all domestic employees. We provide a contribution to an individual retirement contribution account (Company Contribution) maintained with the CEOP equal to an amount between 5.0% and 7.5% of the employee’s eligible compensation. Employees generally vest in the value of the Company Contribution according to a schedule based on service. Prior to February 2023, participants vested 25% after 2 years of service, and 25% each year thereafter, through year 5 of service. After February 2023, participants vest 50% after 2 years of service and 100% after 3 years of service. We also match a percentage of our employee’s CEOP contributions (Company Match), which are invested in the same investment allocation as the employee’s contribution. Prior to February 2023, participants vested 25% after 2 years of service, and 25% each year thereafter, through year 5 of service. After February 2023, employees immediately vest in matching contributions. Our contributions to the CEOP for 2023, 2022 and 2021, were as follows: Years ended December 31, 2023 2022 2021 ($ in millions) Company contribution $ 36.8 $ 37.4 $ 35.4 Company match 14.5 14.4 14.2

STOCK-BASED COMPENSATION

STOCK-BASED COMPENSATION	12 Months Ended
	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
STOCK-BASED COMPENSATION	NOTE 18. STOCK-BASED COMPENSATION Stock-based compensation expense was allocated to the operating segments for the portion related to employees whose compensation would be included in cost of goods sold with the remainder recognized in corporate/other. There were no significant capitalized stock-based compensation costs. Stock-based compensation granted includes stock options, performance share awards, restricted stock awards and deferred directors’ compensation. Stock-based compensation expense was as follows: Years ended December 31, 2023 2022 2021 Stock Compensation Expense ($ in millions) Stock-based compensation $ 26.7 $ 25.6 $ 28.4 Mark-to-market adjustments 1.1 (2.5) 24.7 Total expense $ 27.8 $ 23.1 $ 53.1 Stock Plans Under the stock option and long-term incentive plans, options may be granted to purchase shares of our common stock at an exercise price not less than fair market value at the date of grant, and are exercisable for a period not exceeding ten years from that date. Stock options, restricted stock and performance shares typically vest over three years. We issue shares to settle stock options, restricted stock and share-based performance awards. In 2023, 2022 and 2021, long-term incentive awards included stock options, performance share awards and restricted stock. The stock option exercise price was set at the fair market value of common stock on the date of the grant, and the options have a ten-year term. 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 assumptions: Grant Date Assumptions 2023 2022 2021 Dividend yield 1.32% 1.60% 2.76% Risk-free interest rate 4.07% 1.93% 0.94% Expected volatility 47% 48% 44% Expected life (years) 7.0 7.0 6.0 Weighted-average grant fair value (per option) $ 28.74 $ 21.18 $ 9.91 Weighted-average exercise price $ 60.43 $ 49.71 $ 28.99 Stock options granted 564,124 752,100 1,154,700 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. Stock option transactions were as follows: Exercisable Stock Option Transactions Shares Option Price Weighted-Average Option Price Options Weighted-Average Exercise Price Outstanding at January 1, 2023 5,438,720 13.14-65.77 $ 29.36 3,740,936 $ 26.50 Granted 564,124 49.42-60.55 60.43 Exercised (972,080) 13.14-50.08 26.06 Canceled (107,191) 23.28-60.55 44.79 Outstanding at December 31, 2023 4,923,573 13.14-65.77 $ 33.23 3,654,274 $ 27.33 At December 31, 2023, the average exercise period for all outstanding and exercisable options was 70 months and 59 months, respectively. At December 31, 2023, the aggregate intrinsic value (the difference between the exercise price and market value) for outstanding options was $105.9 million, which includes exercisable options of $97.5 million. The total intrinsic value of options exercised during the years ended December 31, 2023, 2022 and 2021, was $29.7 million, $36.9 million and $73.1 million, respectively. The total unrecognized compensation cost related to unvested stock options at December 31, 2023, was $15.5 million and was expected to be recognized over a weighted-average period of 1.3 years. The following table provides certain information with respect to stock options exercisable at December 31, 2023: Range of Options Exercisable Weighted-Average Exercise Price Options Outstanding Weighted-Average Exercise Price Under $27.00 1,586,954 $ 20.52 1,586,954 $ 20.52 $27.00 - $45.00 1,843,786 30.26 2,107,064 30.12 Over $45.00 223,534 51.53 1,229,555 54.98 3,654,274 4,923,573 At December 31, 2023, common shares reserved for issuance and available for grant or purchase under the following plans consisted of: Number of Shares Incentive Plans Reserved for Issuance Available for Grant or Purchase (1) 2003 Long Term Incentive Plan 29,834 — 2006 Long Term Incentive Plan 18,698 — 2009 Long Term Incentive Plan 94,984 — 2014 Long Term Incentive Plan 355,082 — 2016 Long Term Incentive Plan 1,066,818 — 2018 Long Term Incentive Plan 8,054,619 3,765,408 2021 Long Term Incentive Plan 2,750,000 2,582,262 Total under stock option plans 12,370,035 6,347,670 (1) All available to be issued as stock options, but includes a sub-limit for all types of stock awards of 2,595,246 shares. Number of Shares Director Plans Reserved for Issuance Available for Grant or Purchase 1997 Stock Plan for Non-employee Directors 368,778 106,697 Under the stock purchase plans, our non-employee directors may defer certain elements of their compensation into shares of our common stock based on fair market value of the shares at the time of deferral. Non-employee directors annually receive stock grants as a portion of their director compensation. Of the shares reserved under the stock purchase plans at December 31, 2023, 262,081 shares were committed. 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. Granted shares reflects changes in assumptions associated with the expected achievement of the aforementioned criteria. 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 2023 2022 2021 Risk-free interest rate 4.46% 1.74% 0.23% Expected volatility of Olin common stock 52% 59% 55% Expected average volatility of peer companies 42% 47% 50% Average correlation coefficient of peer companies 0.51 0.51 0.50 Expected life (years) 3.0 3.0 3.0 Grant date fair value (TSR-based award) $ 86.98 $ 64.13 $ 39.96 Grant date fair value (net income-based award) 60.55 49.71 28.99 Performance share awards granted 161,474 184,000 248,700 Risk-free interest rate was based on zero coupon U.S. Treasury securities rates for the expected life of the performance share awards. 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. Performance share transactions were as follows: To Settle in Cash To Settle in Shares Performance Share Transactions Shares Weighted-Average Fair Value per Share Shares Weighted-Average Fair Value per Share Outstanding at January 1, 2023 675,016 $ 52.90 388,808 $ 29.94 Granted 76,455 63.08 91,950 63.56 Paid/issued (357,601) 52.90 (131,633) 17.33 Converted from shares to cash 5,397 37.49 (5,397) 37.49 Canceled (3,605) 54.17 (3,876) 42.61 Outstanding at December 31, 2023 395,662 $ 54.18 339,852 $ 43.65 Total vested at December 31, 2023 309,835 $ 54.18 249,753 $ 40.37 The summary of the status of our unvested performance shares to be settled in cash were as follows: Unvested Performance Shares Shares Weighted-Average Fair Value per Share Unvested at January 1, 2023 125,750 $ 52.90 Granted 76,455 63.08 Vested (112,773) 54.18 Canceled (3,605) 54.17 Unvested at December 31, 2023 85,827 $ 54.18 At December 31, 2023, the liability recorded for performance shares to be settled in cash totaled $17.0 million. The total unrecognized compensation cost related to unvested performance shares at December 31, 2023, was $9.8 million and was expected to be recognized over a weighted-average period of 1.7 years.

SHAREHOLDERS' EQUITY

SHAREHOLDERS' EQUITY	12 Months Ended
	Dec. 31, 2023
Stockholders' Equity Note [Abstract]
SHAREHOLDERS' EQUITY	NOTE 19. 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. On November 1, 2021, our Board of Directors authorized a share repurchase program for the purchase of shares of common stock at an aggregate price of up to $1.0 billion. This program terminated upon the purchase of $1.0 billion of our common stock during the third quarter of 2022. On April 26, 2018, our Board of Directors authorized a share repurchase program for the purchase of shares of common stock at an aggregate price of up to $500.0 million. This program terminated upon the purchase of $500.0 million of our common stock during the first quarter of 2022. For the years ended December 31, 2023, 2022 and 2021, 13.3 million, 25.7 million and 4.7 million shares, respectively, of common stock have been repurchased and retired at a total value of $711.3 million, $1,350.7 million and $251.9 million, respectively. As of December 31, 2023, a cumulative total of 19.2 million shares were repurchased and retired at a total value of $1,003.0 million and $997.0 million of common stock remained authorized to be repurchased under the 2022 Repurchase Authorization program. During 2023, 2022 and 2021, we issued 1.0 million, 1.1 million and 3.4 million shares, respectively, with a total value of $25.4 million, $25.7 million and $72.4 million, respectively, representing stock options exercised. We have registered an undetermined amount of securities with the SEC, so that, from time-to-time, we may issue debt securities, preferred stock and/or common stock and associated warrants in the public market under that registration statement. The following table represents the activity included in accumulated other comprehensive loss: Foreign Currency Translation Cash Flow Hedges Pension and Postretirement Benefits Total Accumulated Other Comprehensive Loss ($ in millions) Balance at January 1, 2021 $ 19.4 $ 21.4 $ (730.7) $ (689.9) Unrealized (losses) gains (30.3) 182.0 249.7 401.4 Reclassification adjustments of (gains) losses into income — (180.1) 54.3 (125.8) Tax provision — (0.5) (73.2) (73.7) Net change (30.3) 1.4 230.8 201.9 Balance at December 31, 2021 (10.9) 22.8 (499.9) (488.0) Unrealized (losses) gains (27.7) (15.6) 72.1 28.8 Reclassification adjustments of (gains) losses into income — (58.2) 35.5 (22.7) Tax benefit (provision) — 18.5 (32.5) (14.0) Net change (27.7) (55.3) 75.1 (7.9) Balance at December 31, 2022 (38.6) (32.5) (424.8) (495.9) Unrealized losses (1.1) (53.6) (18.1) (72.8) Reclassification adjustments of losses into income — 72.5 0.2 72.7 Tax (provision) benefit — (4.8) 4.5 (0.3) Net change (1.1) 14.1 (13.4) (0.4) Balance at December 31, 2023 $ (39.7) $ (18.4) $ (438.2) $ (496.3) Net income (loss), interest expense and cost of goods sold included reclassification adjustments for realized gains and losses on derivative contracts from accumulated other comprehensive loss. Net income (loss) and non-operating pension income included the amortization of prior service costs and actuarial losses from accumulated other comprehensive loss.

SEGMENT INFORMATION

SEGMENT INFORMATION	12 Months Ended
	Dec. 31, 2023
Segment Reporting [Abstract]
SEGMENT INFORMATION	NOTE 20. 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. Years ended December 31, 2023 2022 2021 Segment Detail ($ in millions) Sales Chlor Alkali Products and Vinyls $ 3,995.1 $ 5,085.0 $ 4,140.8 Epoxy 1,329.2 2,690.5 3,186.0 Winchester 1,508.7 1,600.7 1,583.8 Total sales $ 6,833.0 $ 9,376.2 $ 8,910.6 Income before Taxes Chlor Alkali Products and Vinyls $ 664.2 $ 1,181.3 $ 997.8 Epoxy (31.0) 388.5 616.5 Winchester 255.6 372.9 412.1 Corporate/Other: Environmental expense (23.7) (23.2) (14.0) Other corporate and unallocated costs (106.3) (131.5) (135.1) Restructuring charges (89.6) (25.3) (27.9) Other operating income 42.9 16.3 1.4 Interest expense (181.1) (143.9) (348.0) Interest income 4.3 2.2 0.2 Non-operating pension income 24.0 38.7 35.7 Income before taxes $ 559.3 $ 1,676.0 $ 1,538.7 Depreciation and Amortization Expense Chlor Alkali Products and Vinyls $ 440.7 $ 482.2 $ 466.4 Epoxy 57.4 83.3 86.1 Winchester 27.2 24.6 23.3 Corporate/Other 8.1 8.7 6.7 Total depreciation and amortization expense $ 533.4 $ 598.8 $ 582.5 Capital Spending Chlor Alkali Products and Vinyls $ 161.1 $ 151.4 $ 130.2 Epoxy 15.2 27.2 31.0 Winchester 33.3 31.0 28.5 Corporate/Other 26.4 27.3 10.9 Total capital spending $ 236.0 $ 236.9 $ 200.6 Segment assets include only those assets which are directly identifiable to an operating segment. Assets of the corporate/other segment include primarily such items as cash and cash equivalents, deferred taxes and other assets. December 31, 2023 2022 Assets by Segment ($ in millions) Chlor Alkali Products and Vinyls $ 5,650.2 $ 5,782.2 Epoxy 979.3 1,201.9 Winchester 683.6 595.0 Corporate/Other 400.1 465.1 Total assets $ 7,713.2 $ 8,044.2 Property, plant and equipment is attributed to geographic areas based on the asset location, and sales are attributed to geographic areas based on the customer location. December 31, 2023 2022 Property, Plant and Equipment by Geography ($ in millions) United States $ 2,302.7 $ 2,434.4 Foreign 216.9 239.7 Total property, plant and equipment $ 2,519.6 $ 2,674.1 Years ended December 31, 2023 2022 2021 Sales by Geography ($ in millions) Chlor Alkali Products and Vinyls United States $ 2,700.0 $ 3,400.0 $ 2,839.1 Europe 207.9 331.9 203.5 Other foreign 1,087.2 1,353.1 1,098.2 Total Chlor Alkali Products and Vinyls 3,995.1 5,085.0 4,140.8 Epoxy United States 562.8 855.1 926.7 Europe 338.5 1,181.8 1,457.9 Other foreign 427.9 653.6 801.4 Total Epoxy 1,329.2 2,690.5 3,186.0 Winchester United States 1,336.6 1,467.0 1,502.2 Europe 57.3 34.1 19.4 Other foreign 114.8 99.6 62.2 Total Winchester 1,508.7 1,600.7 1,583.8 Total United States 4,599.4 5,722.1 5,268.0 Europe 603.7 1,547.8 1,680.8 Other foreign 1,629.9 2,106.3 1,961.8 Total sales $ 6,833.0 $ 9,376.2 $ 8,910.6 Years ended December 31, 2023 2022 2021 Sales by Product Line ($ in millions) Chlor Alkali Products and Vinyls Caustic soda $ 1,790.0 $ 2,389.1 $ 1,869.3 Chlorine, chlorine derivatives and other products 2,205.1 2,695.9 2,271.5 Total Chlor Alkali Products and Vinyls 3,995.1 5,085.0 4,140.8 Epoxy Aromatics and allylics 525.1 1,338.6 1,450.5 Epoxy resins 804.1 1,351.9 1,735.5 Total Epoxy 1,329.2 2,690.5 3,186.0 Winchester Commercial 806.5 1,079.1 1,104.1 Military and law enforcement 702.2 521.6 479.7 Total Winchester 1,508.7 1,600.7 1,583.8 Total sales $ 6,833.0 $ 9,376.2 $ 8,910.6

ENVIRONMENTAL

ENVIRONMENTAL	12 Months Ended
	Dec. 31, 2023
Environmental Remediation Obligations [Abstract]
ENVIRONMENTAL	NOTE 21. ENVIRONMENTAL As is common in our industry, we are subject to environmental laws and regulations related to the use, storage, handling, generation, transportation, emission, discharge, disposal and remediation of, and exposure to, hazardous and non-hazardous substances and wastes in all of the countries in which we do business. The establishment and implementation of national, state or provincial and local standards to regulate air, water and land quality affect substantially all of our manufacturing locations around the world. Laws providing for regulation of the manufacture, transportation, use and disposal of hazardous and toxic substances, and remediation of contaminated sites, have imposed additional regulatory requirements on industry, particularly the chemicals industry. In addition, implementation of environmental laws has required and will continue to require new capital expenditures and will increase plant operating costs. We employ waste minimization and pollution prevention programs at our manufacturing sites. We are party to various government and private environmental actions associated with past manufacturing facilities and former waste disposal sites. Associated costs of investigatory and remedial activities are provided for in accordance with generally accepted accounting principles governing probability and the ability to reasonably estimate future costs. Our ability to estimate future costs depends on whether our investigatory and remedial activities are in preliminary or advanced stages. With respect to unasserted claims, we accrue liabilities for costs that, in our experience, we expect to incur to protect our interests against those unasserted claims. Our accrued liabilities for unasserted claims amounted to $11.6 million at December 31, 2023. With respect to asserted claims, we accrue liabilities based on remedial investigation, feasibility study, remedial action and operation, maintenance and monitoring (OM&M) expenses that, in our experience, we expect to incur in connection with the asserted claims. Required site OM&M expenses are estimated and accrued in their entirety for required periods not exceeding 30 years, which reasonably approximates the typical duration of long-term site OM&M. Our liabilities for future environmental expenditures were as follows: December 31, 2023 2022 Environmental Liabilities ($ in millions) Beginning balance $ 146.6 $ 147.3 Charges to income 30.1 24.2 Remedial and investigatory spending (25.9) (24.6) Other 2.8 (0.3) Ending balance $ 153.6 $ 146.6 At both December 31, 2023 and 2022, our consolidated balance sheets included environmental liabilities of $121.6 million, which were classified as other noncurrent liabilities. Our environmental liability amounts do not take into account any discounting of future expenditures or any consideration of insurance recoveries or advances in technology. These liabilities are reassessed periodically to determine if environmental circumstances have changed and/or remediation efforts and our estimate of related costs have changed. As a result of these reassessments, future charges to income may be made for additional liabilities. Of the $153.6 million included on our consolidated balance sheet at December 31, 2023, for future environmental expenditures, we currently expect to utilize $59.8 million of the reserve for future environmental expenditures over the next 5 years, $51.2 million for expenditures 6 to 10 years in the future, and $42.6 million for expenditures beyond 10 years in the future. Our total estimated environmental liability at December 31, 2023, was attributable to 58 sites, 14 of which were United States Environmental Protection Agency National Priority List sites. Nine sites accounted for 83% of our environmental liability and, of the remaining 49 sites, no one site accounted for more than 2% of our environmental liability. At seven of the nine sites, part of the site is in the long-term OM&M stage. At seven of the nine sites, a remedial action plan is being developed for part of the site. At six of the nine sites, a remedial design is being developed at part of the site and at four of the nine sites, part of the site is subject to a remedial investigation. All nine sites are either associated with past manufacturing operations or former waste disposal sites. None of the nine largest sites represents more than 25% of the liabilities reserved on our consolidated balance sheet at December 31, 2023, for future environmental expenditures. Environmental provisions charged to income, which are included in cost of goods sold, were as follows: Years ended December 31, 2023 2022 2021 Environmental Expense ($ in millions) Provisions charged to income $ 30.1 $ 24.2 $ 16.2 Insurance recoveries (1) (6.4) (1.0) (2.2) Environmental expense $ 23.7 $ 23.2 $ 14.0 (1) Insurance recoveries for costs incurred and expensed in prior periods. These charges relate primarily to remedial and investigatory activities associated with past manufacturing operations and former waste disposal sites and may be material to operating results in future years. Annual environmental-related cash outlays for site investigation and remediation are expected to range between approximately $25 million to $35 million over the next several years, which are expected to be charged against reserves recorded on our consolidated balance sheet. While we do not anticipate a material increase in the projected annual level of our environmental-related cash outlays for site investigation and remediation, there is always the possibility that such an increase may occur in the future in view of the uncertainties associated with environmental exposures. 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. At December 31, 2023, we estimate that it is reasonably possible that we may have additional contingent environmental liabilities of $80 million in addition to the amounts for which we have already recorded as a reserve.

LEASES

LEASES	12 Months Ended
	Dec. 31, 2023
Leases [Abstract]
LEASES	NOTE 22. LEASES Our lease commitments are primarily for railcars, but also include logistics, manufacturing, storage, real estate and information technology assets. Our leases have remaining lease terms of up to 91 years (14 years excluding land leases), some of which may include options to extend the leases for up to five years, and some of which may include options to terminate the leases within one year. The amounts for leases included in our consolidated balance sheets include: December 31, 2023 2022 Balance Sheet Location: ($ in millions) Lease Assets Operating Operating lease assets, net $ 344.7 $ 356.0 Finance Property, plant and equipment, net (1) — 2.4 Total lease assets $ 344.7 $ 358.4 Lease Liabilities Current Operating Current operating lease liabilities $ 69.3 $ 71.8 Finance Current installments of long-term debt — 1.0 Long-term Operating Operating lease liabilities 283.1 292.5 Finance Long-term debt — 0.9 Total lease liabilities $ 352.4 $ 366.2 (1) As of December 31, 2022, assets recorded under finance leases were $7.6 million and accumulated depreciation associated with finance leases was $5.2 million. The components of lease expense are recorded to cost of goods sold and selling and administrative expenses in the consolidated statement of operations, excluding interest on finance lease liabilities which is recorded to interest expense. The components of lease expense were as follows: Years Ended December 31, 2023 2022 2021 Lease Expense ($ in millions) Operating lease expense $ 88.4 $ 93.4 $ 97.1 Variable and short-term lease expense 24.6 32.5 28.7 Finance lease expense: Depreciation of leased assets 0.5 1.0 1.1 Interest on lease liabilities — 0.1 0.1 Total lease expense $ 113.5 $ 127.0 $ 127.0 Future maturities of operating lease liabilities as of December 31, 2023, are summarized below: Operating Leases Future Lease Maturities ($ in millions) 2024 $ 80.9 2025 70.8 2026 55.0 2027 44.0 2028 37.1 Thereafter 132.6 Total lease payments 420.4 Less: Imputed interest (1) (68.0) Present value of lease liabilities $ 352.4 (1) Calculated using the discount rate for each lease. Other information related to leases was as follows: Years Ended December 31, 2023 2022 2021 Supplemental Cash Flows Information ($ in millions) Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 88.8 $ 93.1 $ 97.4 Operating cash flows from finance leases — 0.1 0.1 Financing cash flows from finance leases 1.9 1.1 1.1 Non-cash increase in lease assets and lease liabilities: Operating leases $ 71.1 $ 71.8 $ 56.7 Finance leases — — 0.1 December 31, 2023 2022 Weighted-Average Remaining Lease Term Operating leases 8.9 years 9.1 years Finance leases — 1.6 years Weighted-Average Discount Rate Operating leases 4.0 % 3.4 % Finance leases — % 3.6 % As of December 31, 2023, we have additional operating leases that have not yet commenced of approximately $1.5 million which are expected to commence during 2024 with lease terms between 2 years and 3 years.

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	12 Months Ended
	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	NOTE 23. COMMITMENTS AND CONTINGENCIES The following table summarizes our contractual commitments under purchase contracts as of December 31, 2023: Purchase Commitments Future Contractual Purchase Commitments ($ in millions) 2024 $ 564.4 2025 564.8 2026 381.1 2027 370.8 2028 367.6 Thereafter 2,842.5 Total purchase commitments $ 5,091.2 The above purchase commitments include raw material, capital expenditure, long-term energy supply contracts and utility purchasing commitments utilized in our normal course of business for our projected needs. Legal Matters Olin, K.A. Steel Chemicals (a wholly owned subsidiary of Olin) and other caustic soda producers were named as defendants in six purported class action civil lawsuits filed March 22, 25 and 26, 2019 and April 12, 2019, in the U.S. District Court for the Western District of New York. Those cases were consolidated on May 22, 2019; the claims in the consolidated “Direct Purchaser” lawsuit, as modified, are on behalf of the respective named plaintiffs and a putative class comprised of all persons and entities who purchased certain types of caustic soda in the U.S. directly from one or more of the defendants, their parents, predecessors, subsidiaries or affiliates at any time on or after October 1, 2015 through December 31, 2018. Olin, K.A. Steel Chemicals and other caustic soda producers were also named as defendants in two purported class action civil lawsuits filed July 25 and 29, 2019 in the U.S. District Court for the Western District of New York on behalf of the respective named plaintiffs and a putative class comprised of all persons and entities who purchased caustic soda in the U.S. indirectly from distributors at any time on or after October 1, 2015. Those cases were consolidated and a consolidated, amended complaint in the “Indirect Purchaser” lawsuit was filed on August 23, 2021. The other current defendants in the Direct Purchaser and Indirect Purchaser lawsuits are Occidental Chemical Corporation d/b/a OxyChem, Westlake Chemical Corporation, Shin-Etsu Chemical Co., Ltd., and Formosa Plastics Corporation, U.S.A. The Direct Purchaser and Indirect Purchaser lawsuits allege the defendants conspired to fix, raise, maintain and stabilize the price of caustic soda, restrict domestic (U.S.) supply of caustic soda and allocate caustic soda customers. Plaintiffs seek damages and injunctive relief. Westlake Chemical Corporation, Shin-Etsu Chemical Co., Ltd., and Formosa Plastics Corporation, U.S.A. all entered settlement agreements in the Direct Purchaser lawsuit, and Shin-Etsu Chemical Co., Ltd also entered a settlement agreement in the Indirect Purchaser lawsuit. All of the settlements are pending court approval. On December 28, 2023, the court denied the plaintiffs’ motion for class certification in the Direct Purchaser lawsuit, and the plaintiffs are seeking an interlocutory appeal of the court’s ruling. Olin, K.A. Steel Chemical, Olin Canada ULC, 3229897 Nova Scotia Co. (wholly owned subsidiaries of Olin) and other alleged caustic soda producers were named as defendants in a proposed class action civil lawsuit filed on October 7, 2020 in the Quebec Superior Court (Province of Quebec) on behalf of the respective named plaintiff and a putative class comprised of all Canadian persons and entities who, between October 1, 2015 and the date of the eventual class action certification, directly or indirectly purchased caustic soda or products containing caustic soda, produced by one or more of the defendants. Olin, K.A. Steel Chemical, Olin Canada ULC, 3229897 Nova Scotia Co. and other alleged caustic soda producers were also named as defendants in a proposed class action civil lawsuit filed November 13, 2020 in the Federal Court of Canada on behalf of the respective named plaintiff and a putative class comprised of all legal persons in Canada who, at any time on or after October 1, 2015 to the present, directly or indirectly purchased caustic soda. The other defendants named in the two Canadian lawsuits are Occidental Petroleum Corporation, Occidental Chemical Corporation, Oxy Canada Sales, Inc., Westlake Chemical Corporation, Axiall Canada, Inc., Shin-Etsu Chemical Co., Ltd., Shintech Incorporated, Formosa Plastics Corporation, and Formosa Plastics Corporation, U.S.A. The lawsuits allege the defendants conspired to fix, raise, maintain control, and stabilize the price of caustic soda, divide and allocate markets, sales, customers and territories, fix, maintain, control, prevent, restrict, lessen or eliminate production and supply of caustic soda, and agree to idle capacity of production and/or refrain from increasing their production capacity. Plaintiffs seek damages, including punitive damages. We believe we have meritorious legal positions and will continue to represent our interests vigorously in the above matters. Any losses related to these matters are not currently estimable because of unresolved questions of fact and law, but if resolved unfavorably to Olin, could have a material adverse effect on our financial position, cash flows or results of operations. We, and our subsidiaries, are defendants in various other legal actions (including proceedings based on alleged exposures to asbestos) incidental to our past and current business activities. At December 31, 2023 and 2022, our consolidated balance sheets included accrued liabilities for these other legal actions of $14.2 million and $14.4 million, respectively. These liabilities do not include costs associated with legal representation. Based on our analysis, and considering the inherent uncertainties associated with litigation, we do not believe that it is reasonably possible that these other legal actions will materially adversely affect our financial position, cash flows or results of operations. During the ordinary course of our business, contingencies arise resulting from an existing condition, situation or set of circumstances involving an uncertainty as to the realization of a possible gain contingency. In certain instances, such as environmental projects, we are responsible for managing the cleanup and remediation of an environmental site. There exists the possibility of recovering a portion of these costs from other parties. We account for gain contingencies in accordance with the provisions of ASC 450 “Contingencies” and, therefore, do not record gain contingencies and recognize income until it is earned and realizable.

DERIVATIVE FINANCIAL INSTRUMENT

DERIVATIVE FINANCIAL INSTRUMENTS	12 Months Ended
	Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE FINANCIAL INSTRUMENTS	NOTE 24. 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 consolidated 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 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 impact our financial position or results of operations. We had the following notional amounts of outstanding forward contracts to buy and sell foreign currency: December 31, 2023 2022 Notional Value - Foreign Currency ($ in millions) Buy $ 21.0 $ 275.8 Sell 140.2 110.7 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: December 31, 2023 2022 Notional Value - Commodity ($ in millions) Natural gas $ 63.2 $ 107.6 Ethane 26.4 46.0 Metals 101.4 107.6 Total notional $ 191.0 $ 261.2 As of December 31, 2023, 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 December 31, 2023, we had open derivative contract positions through 2028. If all open futures contracts had been settled on December 31, 2023, we would have recognized a pretax loss of $24.6 million. If commodity prices were to remain at December 31, 2023 levels, approximately $20.8 million of deferred losses, net of tax, would be reclassified into earnings during the next twelve months. The actual effect on earnings will be dependent on actual commodity prices when the forecasted transactions occur. Fair Value Hedges We use interest rate swaps as a means of managing interest expense and floating interest rate exposure to optimal levels. For derivative instruments that are designated and qualify as a fair value hedge, the gain or loss on the derivative as well as the offsetting loss or gain on the hedged item attributable to the hedged risk are recognized in current earnings. We include the gain or loss on the hedged items (fixed-rate borrowings) in the same line item, interest expense, as the offsetting loss or gain on the related interest rate swaps. There were no outstanding interest rate swaps at December 31, 2023 and 2022. In 2021, we redeemed the 2025 Notes which resulted in recognition of the outstanding deferred swap loss. For the year ended December 31, 2021, $1.8 million was recorded to interest expense on the accompanying consolidated statements of operations related to these swap agreements. Financial Statement Impacts We present our derivative assets and liabilities in our consolidated balance sheets on a net basis whenever we have a legally enforceable master netting agreement with the counterparty to our derivative contracts. We use these agreements to manage and substantially reduce our potential counterparty credit risk. The following table summarizes the location and fair value of the derivative instruments on our consolidated balance sheets: December 31, 2023 2022 Balance Sheet Location ($ in millions) Current Assets Commodity contracts Other current assets $ 2.1 $ 1.5 Foreign currency contracts Other current assets — 0.3 Noncurrent Assets Commodity contracts Other assets 3.2 4.0 Total derivative assets (1) $ 5.3 $ 5.8 Current Liabilities Commodity contracts Accrued liabilities $ 29.4 $ 41.6 Foreign currency contracts Accrued liabilities 2.5 0.9 Noncurrent Liabilities Commodity contracts Other liabilities 0.5 7.4 Total derivative liabilities (1) $ 32.4 $ 49.9 (1) Does not include the impact of cash collateral received from or provided to counterparties. The following table summarizes the effects of derivative instruments on our consolidated statements of operations: Amount of Gain (Loss) for the Years Ended December 31, 2023 2022 2021 Location of Gain (Loss) ($ in millions) Cash Flow Hedges Commodity contracts Other comprehensive (loss) income $ (53.6) $ (15.6) $ 182.0 Commodity contracts Cost of goods sold (72.5) 58.2 180.1 Fair Value Hedges Interest rate contracts Interest expense — — (1.8) Not Designated as Hedging Instruments Commodity contracts Cost of goods sold (0.6) 0.5 — Foreign exchange contracts Selling and administrative (15.1) (27.8) (22.0) Fair Value Measurements 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 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. 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 December 31, 2023 and 2022, this threshold was not exceeded. In all instances where we are party to a master netting agreement, we offset the receivable or payable recognized upon payment of cash collateral against the fair value amounts recognized for derivative instruments that have also been offset under such master netting agreements.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pay vs Performance Disclosure
Net income (loss)	$ 452	$ 1,326.9	$ 1,296.7

Insider Trading Arrangements

Insider Trading Arrangements	12 Months Ended
	Dec. 31, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false

ACCOUNTING POLICIES (Policies)

ACCOUNTING POLICIES (Policies)	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation
Revenue from Contract with Customer	Revenue Recognition We derive our revenues primarily from the manufacturing and delivery of goods to customers. Revenues are recognized on sales of goods at the time when control of those goods is transferred to our customers at an amount that reflects the consideration to which we expect to be entitled in exchange for those goods. We primarily sell our goods directly to customers, and to a lesser extent, through distributors. Payment terms are typically 30 to 90 days from date of invoice. Our contracts do not typically have a significant financing component. Right to payment is determined at the point in time in which control has transferred to the customer. A performance obligation is a promise in a contract to transfer a distinct good to the customer. At contract inception, we assess the goods promised in our contracts with customers and identify a performance obligation for each promise to transfer to the customer a good (or bundle of goods) that is distinct. A contract’s transaction price is based on the price stated in the contract and allocated to each distinct performance obligation and revenue is recognized when the performance obligation is satisfied. Substantially all of our contracts have a single distinct performance obligation or multiple performance obligations which are distinct and represent individual promises within the contract. Substantially all of our performance obligations are satisfied at a single point in time, when control is transferred, which is generally upon shipment or delivery as stated in the contract terms. In some instances, primarily related to governmental contracts within our Winchester business, we recognize revenue over-time as control of the promised goods or services is being transferred to the customer using the cost-to-cost method of accounting. We believe this is an appropriate measure of progress toward satisfaction of performance obligations as this measure most accurately depicts the progress of our work and transfer of control to our customers. For the years ended December 31, 2023, 2022 and 2021, revenue recognized over time represented $104.8 million, $57.8 million and $22.8 million, respectively. All taxes assessed by governmental authorities that are both imposed on and concurrent with our revenue-producing transactions and collected from our customers are excluded from the measurement of the transaction price. Shipping and handling fees billed to customers are included in revenue and are considered activities to fulfill the promise to transfer the good. Allowances for estimated returns, discounts and rebates are considered variable consideration, which may be constrained, and are estimated and recognized when sales are recorded. The estimates are based on various market data, historical trends and information from customers. Actual returns, discounts and rebates have not been materially different from estimates. For all contracts that have a duration of one year or less at contract inception, we do not adjust the promised amount of consideration for the effects of a significant financing component. Substantially all of our revenue is derived from contracts with an original expected length of time of one year or less and for which we recognize revenue for the amount in which we have the right to invoice at the point in time in which control has transferred to the customer. However, a portion of our revenue is derived from long-term contracts which have contract periods that vary between one to multi-year. Certain of these contracts represent contracts with minimum purchase obligations, which can be substantially different than the actual revenue recognized. Such contracts consist of varying types of products across our chemical businesses. Certain contracts include variable volumes and/or variable pricing with pricing provisions tied to commodity, consumer price or other indices. The transaction price allocated to the remaining performance obligations related to our contracts was excluded from the disclosure of our remaining performance obligations based on the following practical expedients that we elected to apply: (i) contracts with index-based pricing or variable volume attributes in which such variable consideration is allocated entirely to a wholly unsatisfied performance obligation; and (ii) contracts with an original expected duration of one year or less.
Cost of Goods Sold and Selling and Administration Expenses	Cost of Goods Sold and Selling and Administrative Expenses Cost of goods sold includes the costs of inventory sold, related purchasing, distribution and warehousing costs, costs incurred for shipping and handling, depreciation and amortization expense related to these activities and environmental remediation costs and recoveries. Selling and administrative expenses include personnel costs associated with sales, marketing and administrative, research and development, legal and legal-related costs, consulting and professional services fees, advertising expenses, depreciation expense related to these activities, foreign currency translation and other similar costs.
Acquisition-related Costs	Acquisition-related Costs
Other Operating Income (Expense)	Other Operating Income (Expense) Other operating income (expense) consists of miscellaneous operating income items, which are related to our business activities, and gains (losses) on disposition of property, plant and equipment. Other operating income for the year ended December 31, 2023, included a gain of $27.0 million from the sale of our domestic private trucking fleet and operations and a gain of $15.6 million for insurance recoveries associated with a second quarter 2022 business interruption at our Plaquemine, LA, Chlor Alkali Products and Vinyls facility. Other operating income for the year ended December 31, 2022, included $13.0 million of gains from the sale of two former manufacturing facilities. Other operating income for the year ended December 31, 2021, included a $1.4 million gain from the sale of a terminal facility.
Other Income (Expense)	Other Income (Expense)
Foreign Currency Translation	Foreign Currency Translation Our worldwide operations utilize the U.S. dollar (USD) or local currency as the functional currency, where applicable. For foreign entities where the USD is the functional currency, gains and losses resulting from balance sheet remeasurement are included in selling and administrative. For foreign entities where the local currency is the functional currency, assets and liabilities denominated in local currencies are translated into USD at end-of-period exchange rates and the resultant translation adjustments are included in accumulated other comprehensive loss. Assets and liabilities denominated in other than the local currency are remeasured into the local currency prior to translation into USD and the resultant exchange gains or losses are included in income in the period in which they occur. Income and expenses are translated into USD using an approximation of the average rate prevailing during the period. We change the functional currency of our separate and distinct foreign entities only when significant changes in economic facts and circumstances indicate clearly that the functional currency has changed.
Cash and Cash Equivalents	Cash and Cash Equivalents All highly liquid investments, with a maturity of three months or less at the date of purchase, are considered cash equivalents.
Short-Term Investments	Short-Term Investments
Allowance for Doubtful Accounts Receivable	Allowance for Doubtful Accounts Receivable We evaluate the collectibility of financial instruments based on our current estimate of credit losses expected to be incurred over the life of the financial instrument. The only significant financial instrument which creates exposure to credit losses are customer accounts receivables. We measure credit losses on uncollected accounts receivable through an allowance for doubtful accounts receivable which is based on a combination of factors including both historical collection experience and reasonable estimates that affect the expected collectibility of the receivable. These factors include historical bad debt experience, industry conditions of the customer or group of customers, geographical region, credit ratings and general market conditions. We group receivables together for purposes of estimating credit losses when customers have similar risk characteristics; otherwise, the estimation is performed on the individual receivable. This estimate is periodically adjusted when we become aware of a specific customer’s inability to meet its financial obligations (e.g., bankruptcy filing) or as a result of changes in the overall aging of accounts receivable. While we have a large number of customers that operate in diverse businesses and are geographically dispersed, a general economic downturn in any of the industry segments in which we operate could result in higher-than-expected defaults, and, therefore, the need to revise estimates for the provision for doubtful accounts could occur.
Inventories	Inventories Inventories are valued at the lower of cost and net realizable value. For U.S. inventories, inventory costs are determined principally by the last-in, first-out (LIFO) method of inventory accounting while for international inventories, inventory costs are determined principally by the first-in, first-out (FIFO) method of inventory accounting. Costs for other inventories have been determined principally by the average-cost method (primarily operating supplies, spare parts and maintenance parts). Elements of costs in inventories include raw materials, direct labor and manufacturing overhead. See Note 8 “Inventories” for additional information.
Property, Plant and Equipment	Property, Plant and Equipment Property, plant and equipment are recorded at cost. Depreciation is computed on a straight-line basis over the estimated useful lives of the related assets. Interest costs incurred to finance expenditures for major long-term construction projects are capitalized as part of the historical cost and included in property, plant and equipment and are depreciated over the useful lives of the related assets. Leasehold improvements are amortized over the term of the lease or the estimated useful life of the improvement, whichever is shorter. Start-up costs are expensed as incurred. Expenditures for maintenance and repairs are charged to expense when incurred while the costs of significant improvements, which extend the useful life of the underlying asset, are capitalized. Property, plant and equipment are reviewed for impairment when conditions indicate that the carrying values of the asset group may not be recoverable. Such impairment conditions include an extended period of idleness or a plan of disposal. If such impairment indicators are present or other factors exist that indicate that the carrying amount of an asset group may not be recoverable, we determine whether impairment has occurred through the use of an undiscounted cash flow analysis at the lowest level for which identifiable cash flows exist. For our Chlor Alkali Products and Vinyls, Epoxy and Winchester segments, the lowest level for which identifiable cash flows exist is the operating facility level or an appropriate grouping of operating facilities level, which represents the asset group. The amount of impairment loss, if any, is measured by the difference between the net book value of the assets and the estimated fair value of the related asset group. See Note 9 “Property, Plant and Equipment” for additional information.
Leases	Leases We determine if an arrangement is a lease at inception of the contract. Operating lease assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. Operating lease assets and liabilities are recognized at commencement date based on the present value of fixed lease payments over the lease term. Our lease commitments are primarily for railcars, but also include logistics, manufacturing, storage, real estate and information technology assets. Leases with an initial term of 12 months or less are not recorded on the balance sheet; instead, we recognize lease expense for these leases on a straight-line basis over the lease term. We do not account for lease components (e.g., fixed payments to use the underlying lease asset) separately from the non-lease components (e.g., fixed payments for common-area maintenance costs and other items that transfer a good or service). Some of our leases include variable lease payments, which primarily result from changes in consumer price and other market-based indices, which are generally updated annually, and maintenance and usage charges. These variable payments are excluded from the calculation of our lease assets and liabilities. Most leases include one or more options to renew, with renewal terms that can extend the lease term from one-to-many years. The exercise of lease renewal options is typically at our sole discretion. Certain leases also include options to purchase the leased asset. We do not include options to renew or purchase leased assets in the measurement of lease liabilities unless those options are highly certain of exercise. The depreciable life of assets and leasehold improvements are limited by the expected lease term, unless there is a transfer of title or purchase option reasonably certain of exercise. We have operating leases with terms that require us to guarantee a portion of the residual value of the leased assets upon termination of the lease as well as other guarantees. These residual value guarantees consist primarily of leases for railcars. Residual value guarantee payments that become probable and estimable are accrued as part of the lease liability and recognized over the remaining life of the applicable lease. Our current expectation is that the likelihood of material residual guarantee payments is remote. We utilize the interest rate implicit in the lease to determine the lease liability when the interest rate can be determined. As most of our leases do not provide an implicit rate, we use our incremental borrowing rate based on the information available at the lease commencement date in determining the present value of lease payments. We estimate the incremental borrowing rate based on the geographic region for which we would borrow, on a secured basis of the lease asset, at an amount equal to the lease payments over a similar time period as the lease term. We have no additional restrictions or covenants imposed by our lease contracts. See Note 22 “Leases” for additional information.
Asset Retirement Obligations	Asset Retirement Obligations We record the fair value of an asset retirement obligation associated with the retirement of a tangible long-lived asset as a liability in the period incurred. The liability is measured at discounted fair value and is adjusted to its present value in subsequent periods as accretion expense is recorded. The corresponding asset retirement costs are capitalized as part of the carrying amount of the related long-lived asset and depreciated over the asset’s useful life. Asset retirement obligations are reviewed annually in the fourth quarter and/or when circumstances or other events indicate that changes underlying retirement assumptions may have occurred. The activities of our asset retirement obligations were as follows: December 31, 2023 2022 Asset Retirement Obligation Activity ($ in millions) Beginning balance $ 66.3 $ 70.2 Accretion 3.3 3.8 Spending (5.0) (8.7) Adjustments 8.2 1.0 Ending balance $ 72.8 $ 66.3 At December 31, 2023 and 2022, our consolidated balance sheets included an asset retirement obligation of $63.3 million and $52.6 million, respectively, which were classified as other noncurrent liabilities. In 2023 and 2022, we had net adjustments that increased the asset retirement obligation by $8.2 million and $1.0 million, respectively, which were primarily comprised of increases in estimated costs for certain assets.
Comprehensive Income (Loss)	Comprehensive Income (Loss)
Acquisition-related Costs	Purchase Accounting
Goodwill	Goodwill Goodwill is not amortized, but is reviewed for impairment annually in the fourth quarter and/or when circumstances or other events indicate that impairment may have occurred. ASC 350 “Intangibles—Goodwill and Other” permits entities to make a qualitative assessment of whether it is more likely than not that a reporting unit’s fair value is less than its carrying amount before applying the goodwill impairment test. Circumstances that are considered as part of the qualitative assessment and could trigger a quantitative impairment test include, but are not limited to: a significant adverse change in the business climate; a significant adverse legal judgment; adverse cash flow trends; an adverse action or assessment by a government agency; unanticipated competition; sustained decline in our stock price; and a significant restructuring charge within a reporting unit. We define reporting units at the business segment level or one level below the business segment level. For purposes of testing goodwill for impairment, goodwill has been allocated to our reporting units to the extent it relates to each reporting unit. It is our practice, at a minimum, to perform a quantitative goodwill impairment test in the fourth quarter every three years. In the fourth quarter of 2023, we performed our triennial quantitative goodwill impairment test for our reporting units. We use a discounted cash flow approach to develop the estimated fair value of a reporting unit when a quantitative test is performed. Management judgment is required in developing the assumptions for the discounted cash flow model. We also corroborate our discounted cash flow analysis by evaluating a market-based approach that considers earnings before interest, taxes, depreciation and amortization (EBITDA) multiples from a representative sample of comparable public companies. As a further indicator that each reporting unit has been valued appropriately using a discounted cash flow model, the aggregate fair value of all reporting units is reconciled to the total market value of Olin. An impairment would be recorded if the carrying amount of a reporting unit exceeded the estimated fair value. Based on the aforementioned analysis, the estimated fair value of our reporting units substantially exceeded the carrying value of the reporting units. Fair value determinations require considerable judgment and are sensitive to changes in underlying assumptions, estimates and market factors. The discount rate, profitability assumptions and terminal growth rate of our reporting units and the cyclical nature of the chlor alkali industry were the material assumptions utilized in the discounted cash flow model used to estimate the fair value of each reporting unit. The discount rate reflects a weighted-average cost of capital, which is calculated based on observable market data. Some of this data (such as the risk free or treasury rate and the pretax cost of debt) are based on the market data at a point in time. Other data (such as the equity risk premium) are based upon market data over time for a peer group of companies in the chemical manufacturing or distribution industries with a market capitalization premium added, as applicable. The discounted cash flow analysis requires estimates, assumptions and judgments about future events. Our analysis uses our internally generated long-range plan. Our discounted cash flow analysis uses the assumptions in our long-range plan about terminal growth rates, forecasted capital expenditures and changes in future working capital requirements to determine the implied fair value of each reporting unit. The long-range plan reflects management judgment, supplemented by independent chemical industry analyses which provide multi-year industry operating and pricing forecasts. We believe the assumptions used in our goodwill impairment analysis are appropriate and result in reasonable estimates of the implied fair value of each reporting unit. However, given the economic environment and the uncertainties regarding the impact on our business, there can be no assurance that our estimates and assumptions, made for purposes of our goodwill impairment testing, will prove to be an accurate prediction of the future. In order to evaluate the sensitivity of the fair value calculation on the goodwill impairment test, we applied a hypothetical 10% decrease to the fair value of each reporting unit. We also applied a hypothetical decrease of 100-basis points in our terminal growth rate or an increase of 100-basis points in our weighted-average cost of capital to test the fair value calculation. In all cases, the estimated fair value of our reporting units derived in these sensitivity calculations exceeded the carrying value in excess of 10%. If our assumptions regarding future performance are not achieved, we may be required to record goodwill impairment charges in future periods. It is not possible at this time to determine if any such future impairment charge would result or, if it does, whether such charge would be material. See Note 11 “Goodwill and Intangible Assets” for additional information.
Intangible Assets	Intangible Assets In conjunction with our acquisitions, we have obtained access to the customer contracts and relationships, trade names, acquired technology and other intellectual property of the acquired companies. These relationships are expected to provide economic benefit for future periods. Amortization expense is recognized on a straight-line basis over the estimated lives of the related assets. The amortization period of customer contracts and relationships, trade names, acquired technology and other intellectual property represents our best estimate of the expected usage or consumption of the economic benefits of the acquired assets, which is based on the company’s historical experience. Intangible assets with finite lives are reviewed for impairment when conditions indicate that the carrying values of the assets may not be recoverable. Circumstances that are considered as part of the qualitative assessment and could trigger a quantitative impairment test include, but are not limited to: a significant adverse change in the business climate; a significant adverse legal judgment including asset specific factors; adverse cash flow trends; an adverse action or assessment by a government agency; unanticipated competition; sustained decline in our stock price; and a significant restructuring charge within a reporting unit. See Note 11 “Goodwill and Intangible Assets” for additional information.
Environmental Liabilities and Expenditures	Environmental Liabilities and Expenditures Accruals (charges to income) for environmental matters are recorded when it is probable that a liability has been incurred and the amount of the liability can be reasonably estimated, based upon current law and existing technologies. These amounts, which are not discounted and are exclusive of claims against third parties, are adjusted periodically as assessment and remediation efforts progress or additional technical or legal information becomes available. Environmental costs are capitalized if the costs increase the value of the property and/or mitigate or prevent contamination from future operations. See Note 21 “Environmental” for additional information.
Income Taxes	Income Taxes Deferred taxes are provided for differences between the financial statement and tax basis of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. A valuation allowance is provided to offset deferred tax assets if, based on the available evidence, it is more likely than not that some or all of the value of the deferred tax assets will not be realized. See Note 15 “Income Taxes” for additional information.
Derivative Financial Instruments	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. We use hedge accounting treatment for a significant amount of our business transactions whose risks are covered using derivative instruments. The hedge accounting treatment provides for the deferral of gains or losses on derivative instruments until such time as the related transactions occur. See Note 24 “Derivative Financial Instruments” for additional information.
Concentration Risk, Credit Risk, Policy	Concentration of Credit Risk Accounts receivable is the principal financial instrument which subjects us to a concentration of credit risk. Credit is extended based upon the evaluation of a customer’s financial condition and, generally, collateral is not required. Concentrations of credit risk with respect to receivables are somewhat limited due to our large number of customers, the diversity of these customers’ businesses and the geographic dispersion of such customers. Our accounts receivable are predominantly derived from sales denominated in USD or the Euro. We maintain an allowance for doubtful accounts based upon the expected collectibility of all trade receivables.
Fair Value	Fair Value 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 consolidated 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. 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 December 31, 2023 and 2022, the fair value measurements of debt were $2,626.2 million and $2,517.7 million, respectively.
Retirement-Related Benefits	Retirement-Related Benefits We account for our defined benefit pension plans and non-pension postretirement benefit plans using actuarial models required by ASC 715 “Compensation—Retirement Benefits”. These models use an attribution approach that generally spreads the financial impact of changes to the plan and actuarial assumptions over the average remaining service lives of the employees in the plan. Changes in liability due to changes in actuarial assumptions such as discount rate, rate of compensation increases and mortality, as well as annual deviations between what was assumed and what was experienced by the plan are treated as actuarial gains or losses. The principle underlying the required attribution approach is that employees render service over their average remaining service lives on a relatively smooth basis and, therefore, the accounting for benefits earned under the pension or non-pension postretirement benefits plans should follow the same relatively smooth pattern. Substantially all domestic defined benefit pension plan participants are no longer accruing benefits; therefore, actuarial gains and losses are amortized based upon the remaining life expectancy of the inactive plan participants. For both the years ended December 31, 2023 and 2022, the average remaining life expectancy of the inactive participants in the domestic defined benefit pension plan were 17 years. One of the key assumptions for the net periodic pension calculation is the expected long-term rate of return on plan assets, used to determine the “market-related value of assets.” The “market-related value of assets” recognizes differences between the plan’s actual return and expected return over a five-year period. The required use of an expected long-term rate of return on the market-related value of plan assets may result in recognized pension income that is greater or less than the actual returns of those plan assets in any given year. Over time, however, the expected long-term returns are designed to approximate the actual long-term returns and, therefore, result in a pattern of income and expense recognition that more closely matches the pattern of the services provided by the employees. As differences between actual and expected returns are recognized over five years, they subsequently generate gains and losses that are subject to amortization over the average remaining life expectancy of the inactive plan participants, as described in the preceding paragraph. We use long-term historical actual return information, the mix of investments that comprise plan assets, and future estimates of long-term investment returns and inflation by reference to external sources to develop the expected long-term rate of return on plan assets as of December 31. The discount rate assumptions used for pension and non-pension postretirement benefit plan accounting reflect the rates available on high-quality fixed-income debt instruments on December 31 of each year. The rate of compensation increase is based upon our long-term plans for such increases. For retiree medical plan accounting, we review external data and our own historical trends for healthcare costs to determine the healthcare cost trend rates.
Stock-Based Compensation	Stock-Based Compensation We measure the cost of employee services received in exchange for an award of equity instruments, such as stock options, performance shares and restricted stock, based on the grant-date fair value of the award. This cost is recognized over the period during which an employee is required to provide service in exchange for the award, the requisite service period (usually the vesting period). An initial measurement is made of the cost of employee services received in exchange for an award of liability instruments based on its current fair value and the value of that award is subsequently remeasured at each reporting date through the settlement date. Changes in fair value of liability awards during the requisite service period are recognized as compensation cost over that period. See Note 18 “Stock-based Compensation” for additional information.
Share Repurchases	Share Repurchases Under our share repurchase programs, we may pursue various share repurchase strategies, which include open market transactions or through privately negotiated transactions, including under an accelerated share repurchase (ASR) agreement, or by other means, including through the use of trading plans intended to qualify under Rule 10b5-1 under the Securities Exchange Act of 1934, as amended. Under an ASR agreement, which is typically with a third-party financial institution to repurchase shares of Olin’s common stock, Olin pays a specified amount to the financial institution and receives an initial delivery of shares. This initial delivery of shares represents the minimum number of shares that Olin may receive under the agreement. Upon settlement of the ASR agreement, the financial institution delivers additional shares, with the final number of shares delivered determined with reference to the volume weighted-average price of Olin’s common stock over the term of the agreement, less an agreed-upon discount. The transactions are accounted for as liability or equity transactions and also as share retirements, similar to our other share repurchase activity, when the shares are received, at which time there is an immediate reduction in the weighted-average common shares calculation for basic and diluted earnings per share. The Inflation Reduction Act (IRA) was enacted in the United States on August 16, 2022. The IRA imposes a 1% excise tax on the fair market value of stock repurchases made by covered corporations after December 31, 2022. The total taxable value of shares repurchased is reduced by the fair market value of any newly issued shares during the taxable year. As a result, we record a tax liability as a cost associated with our share repurchases.

ACCOUNTING POLICIES (Tables)

ACCOUNTING POLICIES (Tables)	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Asset retirement obligation activity	The activities of our asset retirement obligations were as follows: December 31, 2023 2022 Asset Retirement Obligation Activity ($ in millions) Beginning balance $ 66.3 $ 70.2 Accretion 3.3 3.8 Spending (5.0) (8.7) Adjustments 8.2 1.0 Ending balance $ 72.8 $ 66.3

RESTRUCTURING CHARGES (Tables)

RESTRUCTURING CHARGES (Tables)	12 Months Ended
	Dec. 31, 2023
Restructuring and Related Activities [Abstract]
Schedule of Restructuring Reserve by Type of Cost	The following table summarizes the 2023, 2022 and 2021 activities by major component of these restructuring actions and the remaining balances of accrued restructuring costs as of December 31, 2023, 2022 and 2021: Employee Severance and Related Benefit Costs Lease and Other Contract Termination Costs Facility Exit Costs Write-off of Equipment and Facility Total ($ in millions) Balance at January 1, 2021 $ 1.8 $ 1.7 $ — $ — $ 3.5 Restructuring charges 10.3 6.0 11.6 — 27.9 Amounts utilized (5.2) (2.3) (11.6) — (19.1) Balance at December 31, 2021 6.9 5.4 — — 12.3 Restructuring charges 7.4 1.1 13.5 3.3 25.3 Amounts utilized (4.9) (2.3) (13.5) (3.3) (24.0) Balance at December 31, 2022 9.4 4.2 — — 13.6 Restructuring charges 8.4 29.1 34.4 17.7 89.6 Amounts utilized (7.0) (16.6) (34.4) (17.7) (75.7) Balance at December 31, 2023 $ 10.8 $ 16.7 $ — $ — $ 27.5
Restructuring and Related Costs	The following table summarizes the cumulative restructuring charges of these restructuring actions by major component through December 31, 2023: Chlor Alkali Products and Vinyls Epoxy Corporate/Other Total McIntosh Plan Freeport 2021 Plan Freeport 2019 Plan Chlor Alkali 2016 Plan Epoxy Optimization Plan Productivity Plan ($ in millions) Write-off of equipment and facility $ 2.7 $ — $ 58.9 $ 78.1 $ 18.3 $ — $ 158.0 Employee severance and related benefit costs — — 2.1 6.7 15.8 10.3 34.9 Facility exit costs 9.5 13.1 19.1 53.2 18.2 — 113.1 Employee relocation costs — — — 1.7 — — 1.7 Lease and other contract termination costs 6.4 — — 43.0 29.1 — 78.5 Total cumulative restructuring charges $ 18.6 $ 13.1 $ 80.1 $ 182.7 $ 81.4 $ 10.3 $ 386.2

EARNINGS PER SHARE (Tables)

EARNINGS PER SHARE (Tables)	12 Months Ended
	Dec. 31, 2023
Earnings Per Share [Abstract]
Basic and Diluted Earnings Per Share Table	Years ended December 31, 2023 2022 2021 Computation of Net Income per Share (In millions, except per share data) Net income $ 452.0 $ 1,326.9 $ 1,296.7 Net loss attributable to noncontrolling interests (8.2) — — Net income attributable to Olin Corporation 460.2 1,326.9 1,296.7 Basic shares 125.9 144.9 159.1 Basic net income attributable to Olin Corporation per share $ 3.66 $ 9.16 $ 8.15 Diluted shares: Basic shares 125.9 144.9 159.1 Stock-based compensation 2.9 3.6 3.9 Diluted shares 128.8 148.5 163.0 Diluted net income attributable to Olin Corporation per share $ 3.57 $ 8.94 $ 7.96

ACCOUNTS RECEIVABLES (Tables)

ACCOUNTS RECEIVABLES (Tables)	12 Months Ended
	Dec. 31, 2023
Receivables [Abstract]
AR Facilities	The following table summarizes the AR Facilities activity: December 31, 2023 2022 AR Facilities ($ in millions) Beginning balance $ 111.8 $ 83.3 Gross receivables sold 899.0 1,049.7 Payments received from customers on sold accounts (947.5) (1,021.2) Ending balance $ 63.3 $ 111.8

INVENTORIES (Tables)

INVENTORIES (Tables)	12 Months Ended
	Dec. 31, 2023
Inventory Disclosure [Abstract]
Inventories	December 31, 2023 2022 Inventories ($ in millions) Supplies $ 160.3 $ 137.6 Raw materials 171.1 201.2 Work in process 153.5 199.6 Finished goods 507.6 559.3 Inventories excluding LIFO reserve 992.5 1,097.7 LIFO reserve (133.7) (155.8) Inventories, net $ 858.8 $ 941.9

PROPERTY, PLANT AND EQUIPMENT (

PROPERTY, PLANT AND EQUIPMENT (Tables)	12 Months Ended
	Dec. 31, 2023
Property, Plant and Equipment [Abstract]
Schedule of property, plant and equipment along with respective useful lives	December 31, Useful Lives 2023 2022 Property Plant and Equipment ($ in millions) Land and improvements to land 10-20 Years (1) $ 283.1 $ 283.5 Buildings and building equipment 10-30 Years 442.7 412.0 Machinery and equipment 3-20 Years 6,410.5 6,181.1 Leasehold improvements 3-11 Years 8.5 8.5 Construction in progress 201.2 202.1 Property, plant and equipment 7,346.0 7,087.2 Accumulated depreciation (4,826.4) (4,413.1) Property, plant and equipment, net $ 2,519.6 $ 2,674.1 (1) Useful life is exclusive to land improvements.

OTHER ASSETS (Tables)

OTHER ASSETS (Tables)	12 Months Ended
	Dec. 31, 2023
Other Assets [Abstract]
Schedule of Other Assets	Included in other assets were the following: December 31, 2023 2022 Other Assets ($ in millions) Supply contracts $ 1,061.8 $ 1,048.0 Other 56.7 54.5 Other assets $ 1,118.5 $ 1,102.5

GOODWILL AND INTANGIBLE ASSETS

GOODWILL AND INTANGIBLE ASSETS (Tables)	12 Months Ended
	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	Changes in the carrying value of goodwill were as follows: Chlor Alkali Products and Vinyls Epoxy Winchester Total Goodwill ($ in millions) Balance at January 1, 2022 (1) $ 1,275.6 $ 145.0 $ — $ 1,420.6 Foreign currency translation adjustment 0.2 0.1 — 0.3 Balance at December 31, 2022 (1) 1,275.8 145.1 — 1,420.9 Goodwill acquired during the year — — 2.7 2.7 Foreign currency translation adjustment 0.3 0.1 — 0.4 Balance at December 31, 2023 (1) $ 1,276.1 $ 145.2 $ 2.7 $ 1,424.0 (1)
Schedule of Finite-Lived Intangible Assets	Intangible assets consisted of the following: December 31, 2023 2022 Useful Lives Gross Amount Accumulated Amortization Net Gross Amount Accumulated Amortization Net Intangible Assets ($ in millions) Customers, customer contracts and relationships 10-15 Years $ 671.7 $ (437.5) $ 234.2 $ 669.1 $ (401.2) $ 267.9 Trade names 7 Years 3.6 (0.2) 3.4 — — — Acquired technology 4-7 Years 94.4 (90.4) 4.0 93.1 (88.3) 4.8 Other 10 Years 4.9 (0.7) 4.2 1.8 (0.7) 1.1 Total intangible assets $ 774.6 $ (528.8) $ 245.8 $ 764.0 $ (490.2) $ 273.8

DEBT (Tables)

DEBT (Tables)	12 Months Ended
	Dec. 31, 2023
Debt Instruments [Abstract]
Schedule of long-term debt	December 31, 2023 2022 Financing Obligations ($ in millions) Variable-rate Term Loan Facility, due 2027 (6.955% and 5.923% at December 31, 2023 and 2022, respectively) $ 341.3 $ 350.0 Variable-rate Senior Revolving Credit Facility, due 2027 (6.955% at December 31, 2023) 68.0 — Variable-rate Recovery Zone bonds, due 2024-2035 (6.420% and 5.198% at December 31, 2023 and 2022, respectively) 103.0 103.0 Variable-rate Go Zone bonds, due 2024 (6.420% and 5.198% at December 31, 2023 and 2022, respectively) 50.0 50.0 Variable-rate industrial development and environmental improvement obligations, due 2025 (6.45% and 4.55% at December 31, 2023 and 2022, respectively) 2.9 2.9 9.50% senior notes, due 2025 108.6 108.6 5.625% senior notes, due 2029 669.3 669.3 5.125% senior notes, due 2027 500.0 500.0 5.00% senior notes, due 2030 515.3 515.3 Receivables Financing Agreement (See Note 7) 328.5 300.0 Finance lease obligations — 1.9 Other: Deferred debt issuance costs (16.6) (20.1) Unamortized bond original issue discount (0.2) (0.2) Total debt 2,670.1 2,580.7 Amounts due within one year 78.8 9.7 Total long-term debt $ 2,591.3 $ 2,571.0
Schedule of Debt	During 2023 and 2022, activity of our outstanding debt included: Long-term Debt Borrowings (Repayments) for the Year Ended December 31, 2023 2022 Debt Instruments ($ in millions) Borrowings Senior Revolving Credit Facility $ 375.0 $ 320.0 Receivables Financing Agreement 332.7 95.0 Total borrowings 707.7 415.0 Repayments 5.50% senior notes, due 2022 (2022 Notes) — (200.0) Senior Revolving Credit Facility (307.0) (320.0) Term Loan Facility (8.7) — Receivables Financing Agreement (304.2) (95.0) Finance leases (1.9) (1.1) Total repayments (621.8) (616.1) Long-term debt borrowings (repayments), net $ 85.9 $ (201.1) We incurred a loss on debt extinguishment of $152.2 million during the year ended December 31, 2021, which is included as interest expense in the consolidated statements of operations. The loss includes the payment of bond redemption premiums of $137.7 million for the year ended December 31, 2021, as well as the write-off of deferred debt issuance costs, write-off of bond original issue discount and recognition of deferred fair value interest rate swap losses of $14.5 million for the year ended December 31, 2021, associated with the optional prepayment of existing debt. The cash payments related to the early redemption premiums for the debt extinguishments are classified as cash outflows from financing activities on the consolidated statements of cash flows for year ended December 31, 2021.

PENSION PLANS (Tables)

PENSION PLANS (Tables)	12 Months Ended
	Dec. 31, 2023
Retirement Benefits [Abstract]
Changes in benefit obligation and plan assets	Changes in the benefit obligation and plan assets were as follows: December 31, 2023 December 31, 2022 U.S. Foreign Total U.S. Foreign Total Change in Benefit Obligation ($ in millions) Benefit obligation - beginning of year $ 1,868.4 $ 251.1 $ 2,119.5 $ 2,506.0 $ 382.3 $ 2,888.3 Service cost 0.3 5.4 5.7 0.5 7.9 8.4 Interest cost 96.3 9.1 105.4 57.3 4.1 61.4 Actuarial loss (gain) 47.1 14.9 62.0 (556.1) (113.7) (669.8) Benefits paid (141.0) (5.9) (146.9) (139.3) (6.1) (145.4) Plan participant’s contributions — 0.2 0.2 — 0.3 0.3 Settlements — (7.5) (7.5) — — — Foreign currency translation adjustments — 9.8 9.8 — (23.7) (23.7) Benefit obligation - end of year $ 1,871.1 $ 277.1 $ 2,148.2 $ 1,868.4 $ 251.1 $ 2,119.5 December 31, 2023 December 31, 2022 U.S. Foreign Total U.S. Foreign Total Change in Plan Assets ($ in millions) Fair value of plan assets - beginning of year $ 1,824.9 $ 63.3 $ 1,888.2 $ 2,429.6 $ 76.1 $ 2,505.7 Actual return on plans’ assets 173.1 4.0 177.1 (465.6) (7.6) (473.2) Employer contributions 0.2 1.0 1.2 0.2 1.4 1.6 Benefits paid (141.0) (2.8) (143.8) (139.3) (3.1) (142.4) Settlements — (7.1) (7.1) — — — Foreign currency translation adjustments — 2.4 2.4 — (3.5) (3.5) Fair value of plan assets - end of year $ 1,857.2 $ 60.8 $ 1,918.0 $ 1,824.9 $ 63.3 $ 1,888.2 December 31, 2023 December 31, 2022 U.S. Foreign Total U.S. Foreign Total Funded Status ($ in millions) Qualified plans $ (11.9) $ (214.6) $ (226.5) $ (41.4) $ (185.7) $ (227.1) Non-qualified plans (2.0) (1.7) (3.7) (2.1) (2.1) (4.2) Total funded status $ (13.9) $ (216.3) $ (230.2) $ (43.5) $ (187.8) $ (231.3)
Amounts recognized in consolidated balance sheets	Amounts recognized in the consolidated balance sheets consisted of: December 31, 2023 December 31, 2022 U.S. Foreign Total U.S. Foreign Total ($ in millions) Prepaid benefit cost in noncurrent assets $ — $ 1.8 $ 1.8 $ — $ 3.9 $ 3.9 Accrued benefit in current liabilities (0.6) (5.6) (6.2) (0.5) (0.2) (0.7) Accrued benefit in noncurrent liabilities (13.3) (212.5) (225.8) (43.0) (191.5) (234.5) Accumulated other comprehensive loss 558.3 (5.4) 552.9 558.1 (21.4) 536.7 Net balance sheet impact $ 544.4 $ (221.7) $ 322.7 $ 514.6 $ (209.2) $ 305.4
Schedule of Expected Benefit Payments	At December 31, 2023, future benefit payments for qualified and non-qualified plans were as follows: Non-qualified Plans Qualified Plans Expected Benefit Payments ($ in millions) 2024 $ 0.6 $ 152.2 2025 0.4 143.6 2026 0.4 137.8 2027 0.3 132.3 2028 0.2 126.0
Schedule of projected and accumulated benefit obligation, and fair value of plan assets	December 31, 2023 2022 ($ in millions) Projected benefit obligation $ 2,148.2 $ 2,119.5 Accumulated benefit obligation 2,131.7 2,107.5 Fair value of plans’ assets 1,918.0 1,888.2
Components of net periodic benefit income (loss)	Years Ended December 31, 2023 2022 2021 Components of Net Periodic Benefit Income ($ in millions) Service cost $ 5.7 $ 8.4 $ 11.4 Interest cost 105.4 61.4 51.3 Expected return on plans’ assets (131.4) (136.7) (142.3) Amortization of prior service cost (0.4) (0.7) (0.6) Recognized actuarial loss — 34.6 52.7 Net periodic benefit income $ (20.7) $ (33.0) $ (27.5) Years Ended December 31, 2023 2022 2021 Included in Pretax Other Comprehensive Income (Loss) ($ in millions) Liability adjustment $ 16.4 $ (59.9) $ (245.9) Amortization of prior service costs and actuarial losses 0.4 (33.9) (52.1)
Assumptions used in calculations	U.S. Pension Benefits Foreign Pension Benefits Weighted-average Assumptions 2023 2022 2021 2023 2022 2021 Discount rate—periodic benefit cost 5.50 % (1) 2.90 % 2.40 % 3.70 % 1.40 % 0.80 % Expected return on plans’ assets 6.75 % 6.75 % 7.25 % 4.40 % 3.80 % 4.20 % Rate of compensation increase 3.00 % 3.00 % 3.00 % 3.40 % 3.00 % 3.00 % Discount rate—benefit obligation 5.20 % 5.50 % 2.90 % 3.20 % 3.70 % 1.40 % (1) The discount rate—periodic benefit cost for our domestic qualified pension plan is comprised of the discount rate used to determine interest costs of 5.3% and the discount rate used to determine service costs of 5.5%.
Schedule of rate of returns by asset class considered in setting the long-term rate of return assumption	The following rates of return by asset class were considered in setting the long-term rate of return assumption: Asset Class Rate of Return U.S. equities 7% to 11% Non-U.S. equities 8% to 12% Fixed income/cash 3% to 7% Alternative investments 5% to 15%
Plan Asset Allocation by Type	Our pension plan asset allocations at December 31, 2023 and 2022 by asset class were as follows: Percentage of Plan Assets Asset Class 2023 2022 U.S. equities 3 % 4 % Non-U.S. equities 4 % 11 % Fixed income/cash 50 % 38 % Alternative investments 43 % 47 %
Target allocation and ranges	As of December 31, 2023, the following target allocation and ranges have been set for each asset class: Asset Class Target Allocation Target Range U.S. equities (1) 15 % 5-25 Non-U.S. equities (1) 10 % 0-30 Fixed income/cash (1) 75 % 30-95 Alternative investments — % 0-30 (1) The target allocation for these asset classes includes alternative investments, primarily hedge funds, based on the underlying investments in each hedge fund.
Pension plan asset allocation by asset class	The following table summarizes our domestic and foreign defined benefit pension plans assets measured at fair value as of December 31, 2023: Asset Class Investments Measured at Net Asset Value Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Total Equity Securities ($ in millions) U.S. equities $ 12.2 $ 36.6 $ — $ — $ 48.8 Non-U.S. equities 85.4 0.1 0.5 — 86.0 Fixed Income/Cash Cash — 227.7 — — 227.7 Government treasuries — — 244.9 — 244.9 Corporate debt instruments 286.3 — 0.5 — 286.8 Asset-backed securities 192.7 — 14.8 — 207.5 Alternative Investments Hedge fund of funds 599.5 — — — 599.5 Real estate funds 20.1 — — — 20.1 Private equity funds 196.7 — — — 196.7 Total assets $ 1,392.9 $ 264.4 $ 260.7 $ — $ 1,918.0 The following table summarizes our domestic and foreign defined benefit pension plans assets measured at fair value as of December 31, 2022: Asset Class Investments Measured at Net Asset Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs Significant Unobservable Inputs Total Equity Securities ($ in millions) U.S. equities $ 19.2 $ 54.4 $ — $ — $ 73.6 Non-U.S. equities 206.4 0.2 0.1 — 206.7 Fixed Income/Cash Cash — 102.2 — — 102.2 Government treasuries — — 171.2 — 171.2 Corporate debt instruments 345.2 — 0.5 — 345.7 Asset-backed securities 90.1 — 19.0 — 109.1 Alternative Investments Hedge fund of funds 685.1 — — — 685.1 Real estate funds 25.2 — — — 25.2 Private equity funds 169.4 — — — 169.4 Total assets $ 1,540.6 $ 156.8 $ 190.8 $ — $ 1,888.2

POSTRETIREMENT BENEFITS (Tables

POSTRETIREMENT BENEFITS (Tables)	12 Months Ended
	Dec. 31, 2023
POSTRETIREMENT BENEFITS Disclosure [Abstract]
Postretirement plan change in benefit obligation	Changes in the benefit obligation were as follows: December 31, 2023 December 31, 2022 U.S. Foreign Total U.S. Foreign Total Change in Benefit Obligation ($ in millions) Benefit obligation - beginning of year $ 28.5 $ 6.4 $ 34.9 $ 39.3 $ 11.2 $ 50.5 Service cost 0.6 0.1 0.7 0.8 0.3 1.1 Interest cost 1.4 0.4 1.8 0.8 0.3 1.1 Actuarial loss (gain) 1.5 0.2 1.7 (8.0) (4.2) (12.2) Benefits paid (3.8) (0.3) (4.1) (4.4) (0.4) (4.8) Foreign currency translation adjustments — 0.2 0.2 — (0.8) (0.8) Benefit obligation - end of year $ 28.2 $ 7.0 $ 35.2 $ 28.5 $ 6.4 $ 34.9 December 31, 2023 December 31, 2022 U.S. Foreign Total U.S. Foreign Total ($ in millions) Funded status $ (28.2) $ (7.0) $ (35.2) $ (28.5) $ (6.4) $ (34.9)
Amounts recognized in consolidated balance sheet	Amounts recognized in the consolidated balance sheets consisted of: December 31, 2023 December 31, 2022 U.S. Foreign Total U.S. Foreign Total ($ in millions) Accrued benefit in current liabilities $ (2.4) $ (0.3) $ (2.7) $ (2.6) $ (0.3) $ (2.9) Accrued benefit in noncurrent liabilities (25.8) (6.7) (32.5) (25.9) (6.1) (32.0) Accumulated other comprehensive loss 11.0 (2.7) 8.3 10.3 (3.1) 7.2 Net balance sheet impact $ (17.2) $ (9.7) $ (26.9) $ (18.2) $ (9.5) $ (27.7)
Components of net periodic benefit cost	Years Ended December 31, 2023 2022 2021 Components of Net Periodic Benefit Cost ($ in millions) Service cost $ 0.7 $ 1.1 $ 1.3 Interest cost 1.8 1.1 1.0 Amortization of prior service cost 0.1 0.1 0.1 Recognized actuarial loss 0.5 1.5 2.1 Net periodic benefit cost $ 3.1 $ 3.8 $ 4.5 Years Ended December 31, 2023 2022 2021 Included in Pretax Other Comprehensive Income (Loss) ($ in millions) Liability adjustment $ 1.7 $ (12.2) $ (3.8) Amortization of prior service costs and actuarial losses (0.6) (1.6) (2.2)
Schedule of actuarial assumption	December 31, Weighted-Average Assumptions 2023 2022 2021 Discount rate—periodic benefit cost 5.5 % 2.8 % 2.3 % Discount rate—benefit obligation 5.2 % 5.5 % 2.8 %
Assumed healthcare cost trend rates	The assumed healthcare cost trend rates for pre-65 retirees were as follows: December 31, 2023 2022 Healthcare cost trend rate assumed for next year 7.0 % 7.0 % Rate that the cost trend rate gradually declines to 4.5 % 4.5 % Year that the rate reaches the ultimate rate 2033 2032

INCOME TAXES (Tables)

INCOME TAXES (Tables)	12 Months Ended
	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Components of income tax provision	Years ended December 31, 2023 2022 2021 Components of Income (Loss) Before Taxes ($ in millions) U.S. $ 456.7 $ 1,231.2 $ 977.3 Foreign 102.6 444.8 561.4 Income before taxes $ 559.3 $ 1,676.0 $ 1,538.7 Components of Income Tax Provision (Benefit) Current: Federal $ 96.2 $ 225.0 $ 139.6 State 19.4 31.1 24.5 Foreign 48.0 121.7 131.3 Total current 163.6 377.8 295.4 Deferred: Federal (25.3) (32.1) 39.1 State (7.9) (4.3) 6.2 Foreign (23.1) 7.7 (98.7) Total deferred (56.3) (28.7) (53.4) Income tax provision $ 107.3 $ 349.1 $ 242.0
Effective tax rate reconciliation	The following table accounts for the difference between the actual tax provision and the amounts obtained by applying the statutory U.S. federal income tax rate to the income (loss) before taxes. Years ended December 31, Effective Tax Rate Reconciliation (Percent) 2023 2022 2021 Statutory federal tax rate 21.0 % 21.0 % 21.0 % State income taxes, net 2.7 2.3 1.9 Foreign rate differential (1.8) 1.5 2.9 U.S. tax on foreign earnings 1.7 (0.8) 0.3 Salt depletion (1.7) (0.5) (0.6) Change in valuation allowance 2.0 0.4 (10.4) Remeasurement of U.S. state deferred taxes (0.2) (0.8) 0.1 Change in tax contingencies (0.5) 0.5 1.5 Share-based payments (1.0) (0.3) (0.7) Return to provision (3.1) (0.6) (0.5) U.S. federal tax credits — (0.1) — Legal entity liquidation (0.5) (2.0) — Other, net 0.6 0.2 0.2 Effective tax rate 19.2 % 20.8 % 15.7 %
Components of deferred tax assets and liabilities	December 31, 2023 2022 Components of Deferred Tax Assets and Liabilities ($ in millions) Deferred Tax Assets Pension and postretirement benefits $ 42.4 $ 42.9 Environmental reserves 38.3 37.4 Asset retirement obligations 16.6 13.9 Accrued liabilities 46.1 47.4 Lease liabilities 88.1 91.4 Tax credits 47.3 37.4 Net operating losses (NOL) 54.1 23.2 Other miscellaneous items 3.0 2.7 Total deferred tax assets 335.9 296.3 Valuation allowance (99.5) (76.4) Net deferred tax assets 236.4 219.9 Deferred Tax Liabilities Property, plant and equipment 439.5 481.7 Right-of-use lease assets 86.5 89.8 Intangible amortization 76.9 68.7 Inventory and prepaids 5.5 12.1 Taxes on unremitted earnings 16.8 12.0 Other miscellaneous items — 2.4 Total deferred tax liabilities 625.2 666.7 Net deferred income tax liability $ (388.8) $ (446.8)
Summary of Valuation Allowance	The activity of our deferred income tax valuation allowance was as follows: December 31, 2023 2022 Deferred Income Tax Valuation Allowance ($ in millions) Beginning balance $ 76.4 $ 70.1 Increases to valuation allowances 23.6 14.6 Decreases to valuation allowances (0.1) (6.6) Foreign currency translation adjustments (0.4) (1.7) Ending balance $ 99.5 $ 76.4
Unrecognized tax benefits	The amounts of unrecognized tax benefits were as follows: December 31, 2023 2022 Unrecognized Tax Benefits ($ in millions) Beginning balance $ 51.6 $ 43.4 Increase for current year tax positions 1.7 10.3 Increase for prior year tax positions 1.3 0.3 Decrease for prior year tax positions (0.5) (0.8) Reduction due to lapse in statute of limitations (5.1) — Foreign currency translation adjustments 1.3 (1.6) Ending balance $ 50.3 $ 51.6
Tax years 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 - 2022 U.S. state income tax 2012 - 2022 Canadian federal income tax 2015 - 2022 Brazil 2015 - 2022 Germany 2015 - 2022 China 2014 - 2022 The Netherlands 2015 - 2022

ACCRUED LIABILITIES (Tables)

ACCRUED LIABILITIES (Tables)	12 Months Ended
	Dec. 31, 2023
Accrued Liabilities, Current [Abstract]
Accrued Liabilities	Included in accrued liabilities were the following: December 31, 2023 2022 Accrued Liabilities ($ in millions) Accrued compensation and payroll taxes $ 72.0 $ 111.9 Non-income tax-related accruals 52.5 51.4 Accrued interest 35.8 35.6 Legal and professional costs 27.0 41.6 Accrued employee benefits 63.5 64.6 Contract liabilities (current portion only) 34.5 41.1 Environmental (current portion only) 32.0 25.0 Asset retirement obligation (current portion only) 9.5 13.7 Restructuring reserves (current portion only) 22.6 13.6 Derivative contracts 31.9 42.5 Other 68.7 67.8 Accrued liabilities $ 450.0 $ 508.8

CONTRIBUTING EMPLOYEE OWNERSH_2

CONTRIBUTING EMPLOYEE OWNERSHIP PLAN (Tables)	12 Months Ended
	Dec. 31, 2023
Retirement Benefits [Abstract]
Defined Contribution Plan Disclosures	Our contributions to the CEOP for 2023, 2022 and 2021, were as follows: Years ended December 31, 2023 2022 2021 ($ in millions) Company contribution $ 36.8 $ 37.4 $ 35.4 Company match 14.5 14.4 14.2

STOCK-BASED COMPENSATION (Table

STOCK-BASED COMPENSATION (Tables)	12 Months Ended
	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Stock-based compensation expense	Stock-based compensation expense was as follows: Years ended December 31, 2023 2022 2021 Stock Compensation Expense ($ in millions) Stock-based compensation $ 26.7 $ 25.6 $ 28.4 Mark-to-market adjustments 1.1 (2.5) 24.7 Total expense $ 27.8 $ 23.1 $ 53.1
Schedule of assumptions for the Black-Scholes option pricing model	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 assumptions: Grant Date Assumptions 2023 2022 2021 Dividend yield 1.32% 1.60% 2.76% Risk-free interest rate 4.07% 1.93% 0.94% Expected volatility 47% 48% 44% Expected life (years) 7.0 7.0 6.0 Weighted-average grant fair value (per option) $ 28.74 $ 21.18 $ 9.91 Weighted-average exercise price $ 60.43 $ 49.71 $ 28.99 Stock options granted 564,124 752,100 1,154,700
Stock Options Activity	Stock option transactions were as follows: Exercisable Stock Option Transactions Shares Option Price Weighted-Average Option Price Options Weighted-Average Exercise Price Outstanding at January 1, 2023 5,438,720 13.14-65.77 $ 29.36 3,740,936 $ 26.50 Granted 564,124 49.42-60.55 60.43 Exercised (972,080) 13.14-50.08 26.06 Canceled (107,191) 23.28-60.55 44.79 Outstanding at December 31, 2023 4,923,573 13.14-65.77 $ 33.23 3,654,274 $ 27.33
Stock Options Exercisable, Exercise Price Range	The following table provides certain information with respect to stock options exercisable at December 31, 2023: Range of Options Exercisable Weighted-Average Exercise Price Options Outstanding Weighted-Average Exercise Price Under $27.00 1,586,954 $ 20.52 1,586,954 $ 20.52 $27.00 - $45.00 1,843,786 30.26 2,107,064 30.12 Over $45.00 223,534 51.53 1,229,555 54.98 3,654,274 4,923,573
Common shares reserved and available for grant or purchase	At December 31, 2023, common shares reserved for issuance and available for grant or purchase under the following plans consisted of: Number of Shares Incentive Plans Reserved for Issuance Available for Grant or Purchase (1) 2003 Long Term Incentive Plan 29,834 — 2006 Long Term Incentive Plan 18,698 — 2009 Long Term Incentive Plan 94,984 — 2014 Long Term Incentive Plan 355,082 — 2016 Long Term Incentive Plan 1,066,818 — 2018 Long Term Incentive Plan 8,054,619 3,765,408 2021 Long Term Incentive Plan 2,750,000 2,582,262 Total under stock option plans 12,370,035 6,347,670 (1) All available to be issued as stock options, but includes a sub-limit for all types of stock awards of 2,595,246 shares. Number of Shares Director Plans Reserved for Issuance Available for Grant or Purchase 1997 Stock Plan for Non-employee Directors 368,778 106,697
Schedule of Share Based Payment Award, Performance Share Awards, Valuation Assumptions	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 2023 2022 2021 Risk-free interest rate 4.46% 1.74% 0.23% Expected volatility of Olin common stock 52% 59% 55% Expected average volatility of peer companies 42% 47% 50% Average correlation coefficient of peer companies 0.51 0.51 0.50 Expected life (years) 3.0 3.0 3.0 Grant date fair value (TSR-based award) $ 86.98 $ 64.13 $ 39.96 Grant date fair value (net income-based award) 60.55 49.71 28.99 Performance share awards granted 161,474 184,000 248,700
Performance Shares Transactions	Performance share transactions were as follows: To Settle in Cash To Settle in Shares Performance Share Transactions Shares Weighted-Average Fair Value per Share Shares Weighted-Average Fair Value per Share Outstanding at January 1, 2023 675,016 $ 52.90 388,808 $ 29.94 Granted 76,455 63.08 91,950 63.56 Paid/issued (357,601) 52.90 (131,633) 17.33 Converted from shares to cash 5,397 37.49 (5,397) 37.49 Canceled (3,605) 54.17 (3,876) 42.61 Outstanding at December 31, 2023 395,662 $ 54.18 339,852 $ 43.65 Total vested at December 31, 2023 309,835 $ 54.18 249,753 $ 40.37
Summary of Unvested Performance Shares	The summary of the status of our unvested performance shares to be settled in cash were as follows: Unvested Performance Shares Shares Weighted-Average Fair Value per Share Unvested at January 1, 2023 125,750 $ 52.90 Granted 76,455 63.08 Vested (112,773) 54.18 Canceled (3,605) 54.17 Unvested at December 31, 2023 85,827 $ 54.18

SHAREHOLDERS' EQUITY (Tables)

SHAREHOLDERS' EQUITY (Tables)	12 Months Ended
	Dec. 31, 2023
Stockholders' Equity Note [Abstract]
Activity included in accumulated other comprehensive loss table	The following table represents the activity included in accumulated other comprehensive loss: Foreign Currency Translation Cash Flow Hedges Pension and Postretirement Benefits Total Accumulated Other Comprehensive Loss ($ in millions) Balance at January 1, 2021 $ 19.4 $ 21.4 $ (730.7) $ (689.9) Unrealized (losses) gains (30.3) 182.0 249.7 401.4 Reclassification adjustments of (gains) losses into income — (180.1) 54.3 (125.8) Tax provision — (0.5) (73.2) (73.7) Net change (30.3) 1.4 230.8 201.9 Balance at December 31, 2021 (10.9) 22.8 (499.9) (488.0) Unrealized (losses) gains (27.7) (15.6) 72.1 28.8 Reclassification adjustments of (gains) losses into income — (58.2) 35.5 (22.7) Tax benefit (provision) — 18.5 (32.5) (14.0) Net change (27.7) (55.3) 75.1 (7.9) Balance at December 31, 2022 (38.6) (32.5) (424.8) (495.9) Unrealized losses (1.1) (53.6) (18.1) (72.8) Reclassification adjustments of losses into income — 72.5 0.2 72.7 Tax (provision) benefit — (4.8) 4.5 (0.3) Net change (1.1) 14.1 (13.4) (0.4) Balance at December 31, 2023 $ (39.7) $ (18.4) $ (438.2) $ (496.3)

SEGMENT INFORMATION (Tables)

SEGMENT INFORMATION (Tables)	12 Months Ended
	Dec. 31, 2023
Segment Reporting [Abstract]
Segment Information	Years ended December 31, 2023 2022 2021 Segment Detail ($ in millions) Sales Chlor Alkali Products and Vinyls $ 3,995.1 $ 5,085.0 $ 4,140.8 Epoxy 1,329.2 2,690.5 3,186.0 Winchester 1,508.7 1,600.7 1,583.8 Total sales $ 6,833.0 $ 9,376.2 $ 8,910.6 Income before Taxes Chlor Alkali Products and Vinyls $ 664.2 $ 1,181.3 $ 997.8 Epoxy (31.0) 388.5 616.5 Winchester 255.6 372.9 412.1 Corporate/Other: Environmental expense (23.7) (23.2) (14.0) Other corporate and unallocated costs (106.3) (131.5) (135.1) Restructuring charges (89.6) (25.3) (27.9) Other operating income 42.9 16.3 1.4 Interest expense (181.1) (143.9) (348.0) Interest income 4.3 2.2 0.2 Non-operating pension income 24.0 38.7 35.7 Income before taxes $ 559.3 $ 1,676.0 $ 1,538.7 Depreciation and Amortization Expense Chlor Alkali Products and Vinyls $ 440.7 $ 482.2 $ 466.4 Epoxy 57.4 83.3 86.1 Winchester 27.2 24.6 23.3 Corporate/Other 8.1 8.7 6.7 Total depreciation and amortization expense $ 533.4 $ 598.8 $ 582.5 Capital Spending Chlor Alkali Products and Vinyls $ 161.1 $ 151.4 $ 130.2 Epoxy 15.2 27.2 31.0 Winchester 33.3 31.0 28.5 Corporate/Other 26.4 27.3 10.9 Total capital spending $ 236.0 $ 236.9 $ 200.6 Segment assets include only those assets which are directly identifiable to an operating segment. Assets of the corporate/other segment include primarily such items as cash and cash equivalents, deferred taxes and other assets. December 31, 2023 2022 Assets by Segment ($ in millions) Chlor Alkali Products and Vinyls $ 5,650.2 $ 5,782.2 Epoxy 979.3 1,201.9 Winchester 683.6 595.0 Corporate/Other 400.1 465.1 Total assets $ 7,713.2 $ 8,044.2
Segment geographic data	Property, plant and equipment is attributed to geographic areas based on the asset location, and sales are attributed to geographic areas based on the customer location. December 31, 2023 2022 Property, Plant and Equipment by Geography ($ in millions) United States $ 2,302.7 $ 2,434.4 Foreign 216.9 239.7 Total property, plant and equipment $ 2,519.6 $ 2,674.1
Disaggregation of Revenue	Years ended December 31, 2023 2022 2021 Sales by Geography ($ in millions) Chlor Alkali Products and Vinyls United States $ 2,700.0 $ 3,400.0 $ 2,839.1 Europe 207.9 331.9 203.5 Other foreign 1,087.2 1,353.1 1,098.2 Total Chlor Alkali Products and Vinyls 3,995.1 5,085.0 4,140.8 Epoxy United States 562.8 855.1 926.7 Europe 338.5 1,181.8 1,457.9 Other foreign 427.9 653.6 801.4 Total Epoxy 1,329.2 2,690.5 3,186.0 Winchester United States 1,336.6 1,467.0 1,502.2 Europe 57.3 34.1 19.4 Other foreign 114.8 99.6 62.2 Total Winchester 1,508.7 1,600.7 1,583.8 Total United States 4,599.4 5,722.1 5,268.0 Europe 603.7 1,547.8 1,680.8 Other foreign 1,629.9 2,106.3 1,961.8 Total sales $ 6,833.0 $ 9,376.2 $ 8,910.6 Years ended December 31, 2023 2022 2021 Sales by Product Line ($ in millions) Chlor Alkali Products and Vinyls Caustic soda $ 1,790.0 $ 2,389.1 $ 1,869.3 Chlorine, chlorine derivatives and other products 2,205.1 2,695.9 2,271.5 Total Chlor Alkali Products and Vinyls 3,995.1 5,085.0 4,140.8 Epoxy Aromatics and allylics 525.1 1,338.6 1,450.5 Epoxy resins 804.1 1,351.9 1,735.5 Total Epoxy 1,329.2 2,690.5 3,186.0 Winchester Commercial 806.5 1,079.1 1,104.1 Military and law enforcement 702.2 521.6 479.7 Total Winchester 1,508.7 1,600.7 1,583.8 Total sales $ 6,833.0 $ 9,376.2 $ 8,910.6

ENVIRONMENTAL (Tables)

ENVIRONMENTAL (Tables)	12 Months Ended
	Dec. 31, 2023
Environmental Remediation Obligations [Abstract]
Rollforward of environmental liabilities	Our liabilities for future environmental expenditures were as follows: December 31, 2023 2022 Environmental Liabilities ($ in millions) Beginning balance $ 146.6 $ 147.3 Charges to income 30.1 24.2 Remedial and investigatory spending (25.9) (24.6) Other 2.8 (0.3) Ending balance $ 153.6 $ 146.6
Environmental Provisions Charged to Income Table	Environmental provisions charged to income, which are included in cost of goods sold, were as follows: Years ended December 31, 2023 2022 2021 Environmental Expense ($ in millions) Provisions charged to income $ 30.1 $ 24.2 $ 16.2 Insurance recoveries (1) (6.4) (1.0) (2.2) Environmental expense $ 23.7 $ 23.2 $ 14.0

LEASES (Tables)

LEASES (Tables)	12 Months Ended
	Dec. 31, 2023
Leases [Abstract]
Balance Sheet Lease Location	The amounts for leases included in our consolidated balance sheets include: December 31, 2023 2022 Balance Sheet Location: ($ in millions) Lease Assets Operating Operating lease assets, net $ 344.7 $ 356.0 Finance Property, plant and equipment, net (1) — 2.4 Total lease assets $ 344.7 $ 358.4 Lease Liabilities Current Operating Current operating lease liabilities $ 69.3 $ 71.8 Finance Current installments of long-term debt — 1.0 Long-term Operating Operating lease liabilities 283.1 292.5 Finance Long-term debt — 0.9 Total lease liabilities $ 352.4 $ 366.2 (1) As of December 31, 2022, assets recorded under finance leases were $7.6 million and accumulated depreciation associated with finance leases was $5.2 million.
Lease Expense	The components of lease expense are recorded to cost of goods sold and selling and administrative expenses in the consolidated statement of operations, excluding interest on finance lease liabilities which is recorded to interest expense. The components of lease expense were as follows: Years Ended December 31, 2023 2022 2021 Lease Expense ($ in millions) Operating lease expense $ 88.4 $ 93.4 $ 97.1 Variable and short-term lease expense 24.6 32.5 28.7 Finance lease expense: Depreciation of leased assets 0.5 1.0 1.1 Interest on lease liabilities — 0.1 0.1 Total lease expense $ 113.5 $ 127.0 $ 127.0
Operating Lease Liability Maturity Schedule	Future maturities of operating lease liabilities as of December 31, 2023, are summarized below: Operating Leases Future Lease Maturities ($ in millions) 2024 $ 80.9 2025 70.8 2026 55.0 2027 44.0 2028 37.1 Thereafter 132.6 Total lease payments 420.4 Less: Imputed interest (1) (68.0) Present value of lease liabilities $ 352.4 (1) Calculated using the discount rate for each lease.
Finance Lease Liability Maturity Schedule	Future maturities of operating lease liabilities as of December 31, 2023, are summarized below: Operating Leases Future Lease Maturities ($ in millions) 2024 $ 80.9 2025 70.8 2026 55.0 2027 44.0 2028 37.1 Thereafter 132.6 Total lease payments 420.4 Less: Imputed interest (1) (68.0) Present value of lease liabilities $ 352.4 (1) Calculated using the discount rate for each lease.
Supplemental Lease Information	Other information related to leases was as follows: Years Ended December 31, 2023 2022 2021 Supplemental Cash Flows Information ($ in millions) Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 88.8 $ 93.1 $ 97.4 Operating cash flows from finance leases — 0.1 0.1 Financing cash flows from finance leases 1.9 1.1 1.1 Non-cash increase in lease assets and lease liabilities: Operating leases $ 71.1 $ 71.8 $ 56.7 Finance leases — — 0.1

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Tables)	12 Months Ended
	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Contractual commitments under non-cancelable purchase contracts	The following table summarizes our contractual commitments under purchase contracts as of December 31, 2023: Purchase Commitments Future Contractual Purchase Commitments ($ in millions) 2024 $ 564.4 2025 564.8 2026 381.1 2027 370.8 2028 367.6 Thereafter 2,842.5 Total purchase commitments $ 5,091.2

DERIVATIVE FINANCIAL INSTRUME_2

DERIVATIVE FINANCIAL INSTRUMENTS (Tables)	12 Months Ended
	Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of derivative instruments	We had the following notional amounts of outstanding commodity contracts that were entered into to hedge forecasted purchases: December 31, 2023 2022 Notional Value - Commodity ($ in millions) Natural gas $ 63.2 $ 107.6 Ethane 26.4 46.0 Metals 101.4 107.6 Total notional $ 191.0 $ 261.2
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 consolidated balance sheets: December 31, 2023 2022 Balance Sheet Location ($ in millions) Current Assets Commodity contracts Other current assets $ 2.1 $ 1.5 Foreign currency contracts Other current assets — 0.3 Noncurrent Assets Commodity contracts Other assets 3.2 4.0 Total derivative assets (1) $ 5.3 $ 5.8 Current Liabilities Commodity contracts Accrued liabilities $ 29.4 $ 41.6 Foreign currency contracts Accrued liabilities 2.5 0.9 Noncurrent Liabilities Commodity contracts Other liabilities 0.5 7.4 Total derivative liabilities (1) $ 32.4 $ 49.9 (1) Does not include the impact of cash collateral received from or provided to counterparties.
Summary of effects of derivative instruments on consolidated statements of operations	The following table summarizes the effects of derivative instruments on our consolidated statements of operations: Amount of Gain (Loss) for the Years Ended December 31, 2023 2022 2021 Location of Gain (Loss) ($ in millions) Cash Flow Hedges Commodity contracts Other comprehensive (loss) income $ (53.6) $ (15.6) $ 182.0 Commodity contracts Cost of goods sold (72.5) 58.2 180.1 Fair Value Hedges Interest rate contracts Interest expense — — (1.8) Not Designated as Hedging Instruments Commodity contracts Cost of goods sold (0.6) 0.5 — Foreign exchange contracts Selling and administrative (15.1) (27.8) (22.0)

DESCRIPTION OF BUSINESS (Detail

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

ACCOUNTING POLICIES (Details 1)

ACCOUNTING POLICIES (Details 1) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Revenue Recognition, Cost-to-Cost Method	$ 104.8	$ 57.8	$ 22.8
Contract with Customer, Liability	34.8	43.4
Contract with Customer, Asset, after Allowance for Credit Loss	20.1	16.2
Property, Plant and Equipment [Line Items]
Gain on disposition of property, plant and equipment		(13)	(1.4)
Gain on disposition of property, plant and equipment		(13)	$ (1.4)
Asset retirement obligation non-current portion	63.3	52.6
Asset retirement obligation revision of estimate	8.2	1
Long-term Debt, Fair Value	2,626.2	$ 2,517.7
Non-recurring Fair Value, Assets	$ 0
Average remaining life expectancy of the inactive participants in the defined benefit pension plan (in years)	17 years	17 years	17 years
Short-term investments	$ 0	$ 0
Sale of domestic private trucking fleet and operations [Member]
Property, Plant and Equipment [Line Items]
Gain on disposition of property, plant and equipment	(27)
Gain on disposition of property, plant and equipment	(27)
Insurance recoveries associated with business interruption [Member]
Property, Plant and Equipment [Line Items]
Gain on disposition of property, plant and equipment	(15.6)
Gain on disposition of property, plant and equipment	$ (15.6)

ACCOUNTING POLICIES (Details 2)

ACCOUNTING POLICIES (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Asset retirement obligation [Roll Forward]
Beginning balance	$ 66.3	$ 70.2
Accretion	3.3	3.8
Spending	(5)	(8.7)
Adjustments	8.2	1
Ending balance	$ 72.8	$ 66.3

BUSINESS COMBINATIONS AND ASS_2

BUSINESS COMBINATIONS AND ASSET ACQUISITIONS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Asset Acquisition [Line Items]
Business acquired in purchase transaction, net of cash acquired	$ 63.9	$ 0	$ 0
Goodwill	1,424	$ 1,420.9	$ 1,420.6
White Flyer
Asset Acquisition [Line Items]
Business acquired in purchase transaction, net of cash acquired	63.9
Goodwill	2.7
Intangible Assets, Gross (Excluding Goodwill)	4.5
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	66.9
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	$ 10.2

RESTRUCTURING CHARGES (Details)

RESTRUCTURING CHARGES (Details) $ in Millions	6 Months Ended	12 Months Ended			33 Months Ended	34 Months Ended	35 Months Ended	49 Months Ended	93 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)	Mar. 15, 2021 T	Dec. 31, 2020 USD ($)	Dec. 11, 2019 T	Mar. 21, 2016 T
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 89.6	$ 25.3	$ 27.9					$ 386.2
Restructuring and Related Cost, Incurred Cost									200.7
Restructuring Reserve, Settled without Cash									158
Accrued Restructuring Costs	$ 27.5	27.5	13.6	12.3	$ 27.5	$ 27.5	$ 27.5	$ 27.5	27.5		$ 3.5
Stade Plan | Epoxy
Restructuring Cost and Reserve [Line Items]
Restructuring charges	81.4	73.4	8
Additional restructuring and related expected cost	25	25			25	25	25	25	25
McIntosh Plan | Chlor Alkali Products and Vinyls
Restructuring Cost and Reserve [Line Items]
Restructuring charges		4.7	8.3	5.6		18.6
Additional restructuring and related expected cost	20	20			20	20	20	20	20
Total Product Segment Production Capacity Decrease | T										400,000
Productivity Plan | Corporate and Other
Restructuring Cost and Reserve [Line Items]
Restructuring charges				10.3	10.3
Additional restructuring and related expected cost	0	0			0	0	0	0	0
Freeport 2021 Plan | Chlor Alkali Products and Vinyls
Restructuring Cost and Reserve [Line Items]
Restructuring charges		4	2.6	6.5			13.1
Additional restructuring and related expected cost	10	10			10	10	10	10	10
Freeport 2019 Plan | Chlor Alkali Products and Vinyls
Restructuring Cost and Reserve [Line Items]
Restructuring charges		7.5	6	3.9				80.1
Additional restructuring and related expected cost	15	15			15	15	15	15	15
Total Product Segment Production Capacity Decrease | T												230,000
Chlor Alkali 2016 Plan | Chlor Alkali Products and Vinyls
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 0.4	$ 1.6					182.7
Additional restructuring and related expected cost	$ 0	$ 0			$ 0	$ 0	$ 0	$ 0	$ 0
Total Product Segment Production Capacity Decrease | T													433,000

RESTRUCTURING CHARGES (Details

RESTRUCTURING CHARGES (Details 1) - USD ($) $ in Millions	12 Months Ended			93 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2023	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Accrued Restructuring Costs	$ 27.5	$ 13.6	$ 12.3	$ 27.5	$ 3.5
Restructuring charges	89.6	25.3	27.9	386.2
Amounts utilized	(75.7)	(24)	(19.1)
Employee Severance and Related Benefit Costs
Restructuring Cost and Reserve [Line Items]
Accrued Restructuring Costs	10.8	9.4	6.9	10.8	1.8
Restructuring charges	8.4	7.4	10.3	34.9
Amounts utilized	(7)	(4.9)	(5.2)
Lease and Other Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Accrued Restructuring Costs	16.7	4.2	5.4	16.7	1.7
Restructuring charges	29.1	1.1	6	78.5
Amounts utilized	(16.6)	(2.3)	(2.3)
Facility Exit Costs
Restructuring Cost and Reserve [Line Items]
Accrued Restructuring Costs	0	0	0	0	0
Restructuring charges	34.4	13.5	11.6	113.1
Amounts utilized	(34.4)	(13.5)	(11.6)
Write-off of Equipment and Facility
Restructuring Cost and Reserve [Line Items]
Accrued Restructuring Costs	0	0	0	0	$ 0
Restructuring charges	17.7	3.3	0	$ 158
Amounts utilized	$ (17.7)	$ (3.3)	$ 0

RESTRUCTURING CHARGES (Detail_2

RESTRUCTURING CHARGES (Details 2) - USD ($) $ in Millions	6 Months Ended	12 Months Ended			33 Months Ended	34 Months Ended	35 Months Ended	49 Months Ended	93 Months Ended
	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2023
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 89.6	$ 25.3	$ 27.9					$ 386.2
Write-off of Equipment and Facility
Restructuring Cost and Reserve [Line Items]
Restructuring charges		17.7	3.3	0					158
Employee Severance and Related Benefit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges		8.4	7.4	10.3					34.9
Facility Exit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges		34.4	13.5	11.6					113.1
Employee Relocation Cost
Restructuring Cost and Reserve [Line Items]
Restructuring charges									1.7
Lease and Other Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges		29.1	1.1	6					78.5
McIntosh Plan | Chlor Alkali Products and Vinyls
Restructuring Cost and Reserve [Line Items]
Restructuring charges		4.7	8.3	5.6		$ 18.6
McIntosh Plan | Chlor Alkali Products and Vinyls | Write-off of Equipment and Facility
Restructuring Cost and Reserve [Line Items]
Restructuring charges						2.7
McIntosh Plan | Chlor Alkali Products and Vinyls | Employee Severance and Related Benefit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges						0
McIntosh Plan | Chlor Alkali Products and Vinyls | Facility Exit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges						9.5
McIntosh Plan | Chlor Alkali Products and Vinyls | Employee Relocation Cost
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
Freeport 2021 Plan | Chlor Alkali Products and Vinyls
Restructuring Cost and Reserve [Line Items]
Restructuring charges		4	2.6	6.5			$ 13.1
Freeport 2021 Plan | Chlor Alkali Products and Vinyls | Write-off of Equipment and Facility
Restructuring Cost and Reserve [Line Items]
Restructuring charges							0
Freeport 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 | Facility Exit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges							13.1
Freeport 2021 Plan | Chlor Alkali Products and Vinyls | Employee Relocation Cost
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 2019 Plan | Chlor Alkali Products and Vinyls
Restructuring Cost and Reserve [Line Items]
Restructuring charges		7.5	6	3.9				$ 80.1
Freeport 2019 Plan | Chlor Alkali Products and Vinyls | Write-off of Equipment and Facility
Restructuring Cost and Reserve [Line Items]
Restructuring charges								58.9
Freeport 2019 Plan | Chlor Alkali Products and Vinyls | Employee Severance and Related Benefit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges								2.1
Freeport 2019 Plan | Chlor Alkali Products and Vinyls | Facility Exit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges								19.1
Freeport 2019 Plan | Chlor Alkali Products and Vinyls | Employee Relocation Cost
Restructuring Cost and Reserve [Line Items]
Restructuring charges								0
Freeport 2019 Plan | Chlor Alkali Products and Vinyls | Lease and Other Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges								$ 0
Chlor Alkali 2016 Plan | Chlor Alkali Products and Vinyls
Restructuring Cost and Reserve [Line Items]
Restructuring charges			0.4	1.6					182.7
Chlor Alkali 2016 Plan | Chlor Alkali Products and Vinyls | Write-off of Equipment and Facility
Restructuring Cost and Reserve [Line Items]
Restructuring charges									78.1
Chlor Alkali 2016 Plan | Chlor Alkali Products and Vinyls | Employee Severance and Related Benefit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges									6.7
Chlor Alkali 2016 Plan | Chlor Alkali Products and Vinyls | Facility Exit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges									53.2
Chlor Alkali 2016 Plan | Chlor Alkali Products and Vinyls | Employee Relocation Cost
Restructuring Cost and Reserve [Line Items]
Restructuring charges									1.7
Chlor Alkali 2016 Plan | Chlor Alkali Products and Vinyls | Lease and Other Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges									$ 43
Stade Plan | Epoxy
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 81.4	73.4	$ 8
Stade Plan | Epoxy | Write-off of Equipment and Facility
Restructuring Cost and Reserve [Line Items]
Restructuring charges		18.3
Stade Plan | Epoxy | Employee Severance and Related Benefit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges		15.8
Stade Plan | Epoxy | Facility Exit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges		18.2
Stade Plan | Epoxy | Employee Relocation Cost
Restructuring Cost and Reserve [Line Items]
Restructuring charges		0
Stade Plan | Epoxy | Lease and Other Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 29.1
Productivity Plan | Corporate and Other
Restructuring Cost and Reserve [Line Items]
Restructuring charges				$ 10.3	$ 10.3
Productivity Plan | Corporate and Other | Write-off of Equipment and Facility
Restructuring Cost and Reserve [Line Items]
Restructuring charges					0
Productivity Plan | Corporate and Other | Employee Severance and Related Benefit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges					10.3
Productivity Plan | Corporate and Other | Facility Exit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges					0
Productivity Plan | Corporate and Other | Employee Relocation Cost
Restructuring Cost and Reserve [Line Items]
Restructuring charges					0
Productivity Plan | Corporate and Other | Lease and Other Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges					$ 0

EARNINGS PER SHARE (Details)

EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Earnings Per Share [Abstract]
Net income	$ 452	$ 1,326.9	$ 1,296.7
Net loss attributable to noncontrolling interests	(8.2)	0	0
Net income attributable to Olin Corporation	$ 460.2	$ 1,326.9	$ 1,296.7
Basic shares	125.9	144.9	159.1
Earnings per Share, Basic [Abstract]
Basic net income attributable to Olin Corporation per share	$ 3.66	$ 9.16	$ 8.15
Earnings per Share, Diluted [Abstract]
Basic shares	125.9	144.9	159.1
Stock-based compensation (in shares)	2.9	3.6	3.9
Diluted shares	128.8	148.5	163
Diluted net income attributable to Olin Corporation per share	$ 3.57	$ 8.94	$ 7.96
Antidilutive shares excluded from the computation of earnings per share (in shares)	1.2	0.8	0.1

ACCOUNTS RECEIVABLES (Details)

ACCOUNTS RECEIVABLES (Details) € in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2023 EUR (€)	Oct. 11, 2022 USD ($)	Dec. 31, 2021 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables Financing Agreement Outstanding Balance	$ 328.5	$ 300
AR Facilities, Amount Outstanding to be Serviced	63.3	111.8			$ 83.3
AR Facilities, Gross receivables sold	899	1,049.7
AR Facilities, Payments received from customers on sold accounts	(947.5)	(1,021.2)
AR Facilities, Interest Expense	4.7	3.1
AR Facilities, Recourse Liability	0
Financing Receivable, Allowance for Credit Loss	13.1	12.6
Other Receivables	85.3	71.6
U.S.
Accounts, Notes, Loans and Financing Receivable [Line Items]
AR Facilities, Maximum Outstanding Sales	175.5
Foreign
Accounts, Notes, Loans and Financing Receivable [Line Items]
AR Facilities, Maximum Outstanding Sales | €			€ 22
Receivables Financing Agreement
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables Financing Agreement Maximum Borrowing Capacity				$ 425
Receivables Financing Agreement Outstanding Balance	328.5	$ 300
Collateral for Secured Borrowings	456.6
Receivables Financing Available Borrowing Capacity	$ 33.3
$1,550.0 million Senior Credit Facility
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022 Senior Credit Facility				$ 1,550

INVENTORIES (Details)

INVENTORIES (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Inventory Disclosure [Abstract]
Supplies	$ 160.3	$ 137.6
Raw materials	171.1	201.2
Work in process	153.5	199.6
Finished goods	507.6	559.3
Inventories excluding LIFO reserve	992.5	1,097.7
LIFO reserve	(133.7)	(155.8)
Inventories, net	$ 858.8	$ 941.9
Percentage of inventory using the last-in, first-out (LIFO) method of inventory accounting	56%	59%

PROPERTY, PLANT AND EQUIPMENT_2

PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 7,346	$ 7,087.2
Accumulated depreciation	(4,826.4)	(4,413.1)
Property, plant and equipment, net	$ 2,519.6	2,674.1
Weighted Average Useful Life of Machinery and Equipment	11 years
Depreciation expense	$ 421.8	469.9	$ 443.3
Interest capitalized	2.8	3.1	3.2
Increase (Decrease) to Capital Expenditures For Amounts Included In Accounts Payable and Accrued Liabilities	5.3	(4.2)	$ 6.4
Land and improvements to land
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 283.1	283.5
Land and improvements to land | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (in years)	10 years
Land and improvements to land | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (in years)	20 years
Buildings and building equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 442.7	412
Buildings and building equipment | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (in years)	10 years
Buildings and building equipment | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (in years)	30 years
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 6,410.5	6,181.1
Machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (in years)	3 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (in years)	20 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 8.5	8.5
Leasehold improvements | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (in years)	3 years
Leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (in years)	11 years
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 201.2	$ 202.1

OTHER ASSETS (Details)

OTHER ASSETS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Other Assets [Abstract]
Supply contracts	$ 1,061.8	$ 1,048
Other	56.7	54.5
Other assets	1,118.5	1,102.5
Long-term Other Supply Contract Payments	$ 64.5	37.7	$ 0
Supply Contract Weighted-average Useful Life	20 years
Supply Contract Amortization	$ 71.2	$ 70.4	$ 69.4
Supply Contract Amortization Expense Next Twelve Months	71.4
Supply Contract Amortization Expense, Year 2	71.4
Supply Contract Amortization Expense, Year 3	71.4
Supply Contract Amortization Expense, Year 4	69.8
Supply Contract Amortization Expense, Year 5	$ 66.5

GOODWILL AND INTANGIBLE ASSET_2

GOODWILL AND INTANGIBLE ASSETS (Details 1) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Line Items]
Goodwill	$ 1,424	$ 1,420.9	$ 1,420.6
Foreign currency translation adjustment	0.4	0.3
Goodwill, Acquired During Period	2.7
Goodwill, Impairment Loss	0	0
Amortization	37	55.3	63.1
Chlor Alkali Products and Vinyls
Goodwill [Line Items]
Goodwill	1,276.1	1,275.8	1,275.6
Foreign currency translation adjustment	0.3	0.2
Goodwill, Acquired During Period	0
Goodwill, Impairment Loss				$ 557.6
Epoxy
Goodwill [Line Items]
Goodwill	145.2	145.1	145
Foreign currency translation adjustment	0.1	0.1
Goodwill, Acquired During Period	0
Goodwill, Impairment Loss				$ 142.2
Winchester
Goodwill [Line Items]
Goodwill	2.7	0	$ 0
Foreign currency translation adjustment	0	$ 0
Goodwill, Acquired During Period	$ 2.7

GOODWILL AND INTANGIBLE ASSET_3

GOODWILL AND INTANGIBLE ASSETS (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Assets, Gross	$ 774.6	$ 764
Finite-Lived Intangible Assets, Accumulated Amortization	(528.8)	(490.2)
Finite-Lived Intangible Assets, Net	245.8	273.8
Amortization	37	55.3	$ 63.1
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	37.6
Finite-Lived Intangible Assets, Amortization Expense, Year Two	37.2
Finite-Lived Intangible Assets, Amortization Expense, Year Three	35.5
Finite-Lived Intangible Assets, Amortization Expense, Year Four	35.4
Finite-Lived Intangible Assets, Amortization Expense, Year Five	35.2
Finite-lived intangible asset impairment charge	0	0	$ 0
Customers, customer contracts and relationships
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Assets, Gross	671.7	669.1
Finite-Lived Intangible Assets, Accumulated Amortization	(437.5)	(401.2)
Finite-Lived Intangible Assets, Net	$ 234.2	267.9
Customers, customer contracts and relationships | Minimum
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Asset, Useful Life	10 years
Customers, customer contracts and relationships | Maximum
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Asset, Useful Life	15 years
Trade names
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Assets, Gross	$ 3.6	0
Finite-Lived Intangible Assets, Accumulated Amortization	(0.2)	0
Finite-Lived Intangible Assets, Net	$ 3.4	0
Trade names | Minimum
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Asset, Useful Life	7 years
Trade names | Maximum
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Asset, Useful Life	7 years
Acquired technology
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Assets, Gross	$ 94.4	93.1
Finite-Lived Intangible Assets, Accumulated Amortization	(90.4)	(88.3)
Finite-Lived Intangible Assets, Net	$ 4	4.8
Acquired technology | Minimum
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Asset, Useful Life	4 years
Acquired technology | Maximum
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Asset, Useful Life	7 years
Other
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Assets, Gross	$ 4.9	1.8
Finite-Lived Intangible Assets, Accumulated Amortization	(0.7)	(0.7)
Finite-Lived Intangible Assets, Net	$ 4.2	$ 1.1
Other | Minimum
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Asset, Useful Life	10 years
Other | Maximum
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Asset, Useful Life	10 years

DEBT (Details 1)

DEBT (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Receivables Financing Agreement (See Note 7)	$ 328,500	$ 300,000
Finance lease obligations	0	1,900
Deferred debt issuance costs	(16,600)	(20,100)
Unamortized bond original issue discount	200	200
Total debt	2,670,100	2,580,700
Amounts due within one year	78,800	9,700
Total long-term debt	2,591,300	2,571,000
Proceeds from Issuance of Long-term Debt	707,700	415,000
Repayments	(621,800)	(616,100)	$ (1,643,100)
Long-term debt (repayments) borrowings, net	85,900	(201,100)
Loss on debt extinguishment	0	0	152,200
Debt early redemption premiums	0	0	137,700
Write-off of Deferred Debt Issuance Costs and Fair Value Swap Losses			$ 14,500
Long-Term Debt	2,686,900
$350.0 million Senior Term Loan
Debt Instrument [Line Items]
Notes payable	$ 341,300	$ 350,000
Interest rate	6.955%	5.923%
$1,550.0 million Senior Credit Facility
Debt Instrument [Line Items]
Notes payable	$ 68,000	$ 0
Interest rate	6.955%	0%
Variable-Rate Recovery Zone Bonds
Debt Instrument [Line Items]
Notes payable	$ 103,000	$ 103,000
Interest rate	6.42%	5.198%
Variable-Rate Go Zone Bonds
Debt Instrument [Line Items]
Notes payable	$ 50,000	$ 50,000
Interest rate	6.42%	5.198%
Industrial Development and Environmental Improvement Obligations
Debt Instrument [Line Items]
Notes payable	$ 2,900	$ 2,900
Interest rate	6.45%	4.55%
2025 Notes 9.50%
Debt Instrument [Line Items]
Notes payable	$ 108,600	$ 108,600
Interest rate	9.50%	9.50%
2029 Notes
Debt Instrument [Line Items]
Notes payable	$ 669,300	$ 669,300
Interest rate	5.625%	5.625%
2027 Notes
Debt Instrument [Line Items]
Notes payable	$ 500,000	$ 500,000
Interest rate	5.125%	5.125%
2030 Notes
Debt Instrument [Line Items]
Notes payable	$ 515,300	$ 515,300
Interest rate	5%	5%
$1,200 million Senior Revolving Credit Facility
Debt Instrument [Line Items]
Proceeds from Issuance of Long-term Debt	$ 375,000	$ 320,000
Repayments	(307,000)	(320,000)
Senior Term Loans
Debt Instrument [Line Items]
Proceeds from Issuance of Long-term Debt	332,700	95,000
Repayments	(8,700)	0
2022 Notes
Debt Instrument [Line Items]
Repayments	0	(200,000)
Receivables Financing Agreement
Debt Instrument [Line Items]
Receivables Financing Agreement (See Note 7)	328,500	300,000
Repayments	(304,200)	(95,000)
Finance Leases
Debt Instrument [Line Items]
Repayments	$ (1,900)	$ (1,100)

DEBT (Details 2)

DEBT (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Oct. 11, 2022	Feb. 24, 2021
Debt Instrument [Line Items]
Quarterly Required Principal Payment Percent Through 2024				0.625%
Quarterly Required Principal Payment Percent After 2024				1.25%
Senior Revolving Credit Facility, Available Borrowing Amount	$ 1,131,600
Repayments	(621,800)	$ (616,100)	$ (1,643,100)
Debt early redemption premiums	0	0	137,700
Write-off of Deferred Debt Issuance Costs and Fair Value Swap Losses			14,500
Debt issuance costs	0	$ 4,400	$ 3,900
Total Letters of Credit Outstanding	120,700
Expected maturities of long-term debt [Abstract]
2024	78,800
2025	457,500
2026	17,500
2027	865,500
2028	0
Thereafter	$ 1,267,600
$1,550.0 million Senior Credit Facility
Debt Instrument [Line Items]
2022 Senior Credit Facility				$ 1,550,000
Interest rate	6.955%	0%
$350.0 million Term Loan Facility
Debt Instrument [Line Items]
Term Loan Facility, Maximum Borrowing Capacity				350,000
$1,200 million Senior Revolving Credit Facility
Debt Instrument [Line Items]
Revolving Credit Facility, Maximum Borrowing Capacity				$ 1,200,000
Letter of Credit Subfacility, Maximum					$ 100,000
Senior Revolving Credit Facility, Letters of Credit Outstanding Amount	$ 400
Repayments	(307,000)	$ (320,000)
Senior Term Loans
Debt Instrument [Line Items]
Repayments	$ (8,700)	$ 0
2025 Notes 9.50%
Debt Instrument [Line Items]
Interest rate	9.50%	9.50%

PENSION PLANS (Details)

PENSION PLANS (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 1.2	$ 1.6
After-tax benefit (charge) to shareholders' equity	11.9	(37.2)
Pretax benefit (charge) to shareholders' equity	16.4	$ (59.9)	$ (245.9)
Basis point increase (decrease) in the plans' discount rate reflected in benefit (charge) to shareholders' equity - domestic		260
Actuarial loss (gain)	62	$ (669.8)
Benefit obligation	2,148.2	2,119.5	2,888.3
Projected benefit payments [Abstract]
Par outstanding value of bonds used to determine the discount rate yield curve	$ 250
Historic rate of return on plan assets in the last 5 year period	6.70%
Historic rate of return on plan assets in the last 10 year period	6.70%
Historic rate of return on plan assets in the last 15 year period	7.80%
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	$ (7.5)	0
Qualified plans
Projected benefit payments [Abstract]
2023	152.2
2024	143.6
2025	137.8
2026	132.3
2027	126
Non-qualified plans
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation	3.7	4.2
Projected benefit payments [Abstract]
2023	0.6
2024	0.4
2025	0.4
2026	0.3
2027	$ 0.2
U.S.
Defined Benefit Plan Disclosure [Line Items]
Basis point increase (decrease) in the plans' discount rate reflected in benefit (charge) to shareholders' equity - domestic	30
U.S. | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 0.2	0.2
Actuarial loss (gain)	47.1	(556.1)
Benefit obligation	$ 1,871.1	$ 1,868.4	$ 2,506
Projected benefit payments [Abstract]
Discount rate—periodic benefit cost	5.50%	2.90%	2.40%
Expected return on plans’ assets	6.75%	6.75%	7.25%
Rate of compensation increase	3%	3%	3%
Discount rate—benefit obligation	5.20%	5.50%	2.90%
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	$ 0	$ 0
Foreign
Defined Benefit Plan Disclosure [Line Items]
Basis point increase/decrease in the plans' discount rate reflected in charge to shareholders' equity - international	(50)	230
Foreign | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 1	$ 1.4
Actuarial loss (gain)	14.9	(113.7)
Benefit obligation	$ 277.1	$ 251.1	$ 382.3
Projected benefit payments [Abstract]
Discount rate—periodic benefit cost	3.70%	1.40%	0.80%
Expected return on plans’ assets	4.40%	3.80%	4.20%
Rate of compensation increase	3.40%	3%	3%
Discount rate—benefit obligation	3.20%	3.70%	1.40%
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	$ (7.5)	$ 0
Foreign | Qualified plans
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	1	$ 1.3	$ 1.1
Foreign | Qualified plans | Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	$ 5

PENSION PLANS (Details 1)

PENSION PLANS (Details 1) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	$ 2,119.5	$ 2,888.3
Service cost	5.7	8.4
Interest cost	105.4	61.4	$ 51.3
Actuarial loss (gain)	62	(669.8)
Benefits paid	146.9	145.4
Plan participant’s contributions	0.2	0.3
Settlements	7.5	0
Foreign currency translation adjustments	9.8	(23.7)
Benefit obligation - end of year	2,148.2	2,119.5	2,888.3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plans' assets at beginning of year	1,888.2	2,505.7
Actual return on plans’ assets	177.1	(473.2)
Employer contributions	1.2	1.6
Benefits paid	143.8	142.4
Foreign currency translation adjustments	2.4	(3.5)
Fair value of plans' assets at end of year	1,918	1,888.2	2,505.7
Qualified plans
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Defined Benefit Plan, Funded (Unfunded) Status of Plan	226.5	227.1
Non-qualified plans
Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	4.2
Benefit obligation - end of year	3.7	4.2
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Defined Benefit Plan, Funded (Unfunded) Status of Plan	3.7	4.2
Foreign | Qualified plans
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Employer contributions	1	1.3	1.1
Pension Plan
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(230.2)	(231.3)
Pension Plan | Foreign
Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	251.1	382.3
Service cost	5.4	7.9
Interest cost	9.1	4.1
Actuarial loss (gain)	14.9	(113.7)
Benefits paid	5.9	6.1
Plan participant’s contributions	0.2	0.3
Settlements	7.5	0
Foreign currency translation adjustments	9.8	(23.7)
Benefit obligation - end of year	277.1	251.1	382.3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plans' assets at beginning of year	63.3	76.1
Actual return on plans’ assets	4	(7.6)
Employer contributions	1	1.4
Benefits paid	2.8	3.1
Foreign currency translation adjustments	2.4	(3.5)
Fair value of plans' assets at end of year	60.8	63.3	76.1
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(216.3)	(187.8)
Pension Plan | Foreign | Qualified plans
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Defined Benefit Plan, Funded (Unfunded) Status of Plan	214.6	185.7
Pension Plan | Foreign | Non-qualified plans
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Defined Benefit Plan, Funded (Unfunded) Status of Plan	1.7	2.1
Pension Plan | U.S.
Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	1,868.4	2,506
Service cost	0.3	0.5
Interest cost	96.3	57.3
Actuarial loss (gain)	47.1	(556.1)
Benefits paid	141	139.3
Plan participant’s contributions	0	0
Settlements	0	0
Foreign currency translation adjustments	0	0
Benefit obligation - end of year	1,871.1	1,868.4	2,506
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plans' assets at beginning of year	1,824.9	2,429.6
Actual return on plans’ assets	173.1	(465.6)
Employer contributions	0.2	0.2
Benefits paid	141	139.3
Foreign currency translation adjustments	0	0
Fair value of plans' assets at end of year	1,857.2	1,824.9	$ 2,429.6
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(13.9)	(43.5)
Pension Plan | U.S. | Qualified plans
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Defined Benefit Plan, Funded (Unfunded) Status of Plan	11.9	41.4
Pension Plan | U.S. | Non-qualified plans
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Defined Benefit Plan, Funded (Unfunded) Status of Plan	$ 2	$ 2.1

PENSION PLANS (Details 2)

PENSION PLANS (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Amounts Recognized in Balance Sheet [Abstract]
Prepaid benefit cost in noncurrent assets	$ 1.8	$ 3.9
Accrued benefit in current liabilities	6.2	0.7
Accrued benefit in noncurrent liabilities	225.8	234.5
Accumulated other comprehensive loss	552.9	536.7
Net balance sheet impact	322.7	305.4
Defined Benefit Plan, Plan Assets, Benefits Paid	(143.8)	(142.4)
Defined Benefit Plan, Plan Assets, Payment for Settlement	7.1	0
Pension Plan | U.S.
Amounts Recognized in Balance Sheet [Abstract]
Prepaid benefit cost in noncurrent assets	0	0
Accrued benefit in current liabilities	0.6	0.5
Accrued benefit in noncurrent liabilities	13.3	43
Accumulated other comprehensive loss	558.3	558.1
Net balance sheet impact	544.4	514.6
Defined Benefit Plan, Plan Assets, Benefits Paid	(141)	(139.3)
Defined Benefit Plan, Plan Assets, Payment for Settlement	0	0
Pension Plan | Foreign
Amounts Recognized in Balance Sheet [Abstract]
Prepaid benefit cost in noncurrent assets	1.8	3.9
Accrued benefit in current liabilities	5.6	0.2
Accrued benefit in noncurrent liabilities	212.5	191.5
Accumulated other comprehensive loss	(5.4)	(21.4)
Net balance sheet impact	(221.7)	(209.2)
Defined Benefit Plan, Plan Assets, Benefits Paid	(2.8)	(3.1)
Defined Benefit Plan, Plan Assets, Payment for Settlement	$ 7.1	$ 0

PENSION PLANS (Details 3)

PENSION PLANS (Details 3) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Retirement Benefits [Abstract]
Projected benefit obligation	$ 2,148.2	$ 2,119.5
Accumulated benefit obligation	2,131.7	2,107.5
Fair value of plans’ assets	$ 1,918	$ 1,888.2

PENSION PLANS (Details 4)

PENSION PLANS (Details 4) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Components of Net Periodic Benefit (Income) Cost [Abstract]
Service cost	$ 5.7	$ 8.4	$ 11.4
Interest cost	105.4	61.4	51.3
Expected return on plans’ assets	(131.4)	(136.7)	(142.3)
Amortization of prior service cost	(0.4)	(0.7)	(0.6)
Recognized actuarial loss	0	34.6	52.7
Net periodic benefit income	(20.7)	(33)	(27.5)
Included in Pretax Other Comprehensive Income (Loss)
Liability adjustment	16.4	(59.9)	(245.9)
Amortization of prior service costs and actuarial losses	$ 0.4	$ (33.9)	$ (52.1)

PENSION PLANS (Details 5)

PENSION PLANS (Details 5)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Weighted Average Assumptions [Abstract]
Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate for Interest Cost	5.30%
Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate for Service Cost	5.50%
Pension Plan | U.S.
Weighted Average Assumptions [Abstract]
Discount rate—periodic benefit cost	5.50%	2.90%	2.40%
Expected return on plans’ assets	6.75%	6.75%	7.25%
Rate of compensation increase	3%	3%	3%
Discount rate—benefit obligation	5.20%	5.50%	2.90%
Pension Plan | Foreign
Weighted Average Assumptions [Abstract]
Discount rate—periodic benefit cost	3.70%	1.40%	0.80%
Expected return on plans’ assets	4.40%	3.80%	4.20%
Rate of compensation increase	3.40%	3%	3%
Discount rate—benefit obligation	3.20%	3.70%	1.40%

PENSION PLANS (Details 6)

PENSION PLANS (Details 6)	12 Months Ended
	Dec. 31, 2023
Long-term rate of return assumption by asset class [Abstract]
U.S. equities, minimum	7%
U.S. equities, maximum	11%
Non-U.S. equities, minimum	8%
Non-U.S. equities, maximum	12%
Fixed income/cash, minimum	3%
Fixed income/cash, maximum	7%
Alternative investments, minimum	5%
Alternative investments, maximum	15%

PENSION PLANS (Details 7)

PENSION PLANS (Details 7)	Dec. 31, 2023	Dec. 31, 2022
U.S. equities(1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	3%	4%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	15%
Non-U.S. equities(1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	4%	11%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	10%
Fixed income/cash(1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	50%	38%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	75%
Alternative investments
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	43%	47%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	0%
Minimum | U.S. equities(1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	7%
Minimum | Non-U.S. equities(1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	8%
Minimum | Fixed income/cash(1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	3%
Minimum | Alternative investments
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	5%
Maximum | U.S. equities(1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	11%
Maximum | Non-U.S. equities(1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	12%
Maximum | Fixed income/cash(1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	7%
Maximum | Alternative investments
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	15%

PENSION PLANS (Details 8)

PENSION PLANS (Details 8) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 1,918	$ 1,888.2	$ 2,505.7
Investments Measured at Net Asset Value
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	1,392.9	1,540.6
Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	264.4	156.8
Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	260.7	190.8
Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. equities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	48.8	73.6
U.S. equities | Investments Measured at Net Asset Value
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	12.2	19.2
U.S. equities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	36.6	54.4
U.S. equities | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.S. equities | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Non-U.S. equities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	86	206.7
Non-U.S. equities | Investments Measured at Net Asset Value
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	85.4	206.4
Non-U.S. equities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0.1	0.2
Non-U.S. equities | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0.5	0.1
Non-U.S. equities | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Cash
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	227.7	102.2
Cash | Investments Measured at Net Asset Value
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Cash | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	227.7	102.2
Cash | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Cash | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Government treasuries
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	244.9	171.2
Government treasuries | Investments Measured at Net Asset Value
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Government treasuries | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Government treasuries | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	244.9	171.2
Government treasuries | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Corporate debt instruments
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	286.8	345.7
Corporate debt instruments | Investments Measured at Net Asset Value
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	286.3	345.2
Corporate debt instruments | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Corporate debt instruments | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0.5	0.5
Corporate debt instruments | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Asset-backed securities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	207.5	109.1
Asset-backed securities | Investments Measured at Net Asset Value
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	192.7	90.1
Asset-backed securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Asset-backed securities | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	14.8	19
Asset-backed securities | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Hedge fund of funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	599.5	685.1
Hedge fund of funds | Investments Measured at Net Asset Value
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	599.5	685.1
Hedge fund of funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Hedge fund of funds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Hedge fund of funds | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Real estate funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	20.1	25.2
Real estate funds | Investments Measured at Net Asset Value
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	20.1	25.2
Real estate funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Real estate funds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Real estate funds | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Private equity funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	196.7	169.4
Private equity funds | Investments Measured at Net Asset Value
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	196.7	169.4
Private equity funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Private equity funds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Private equity funds | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 0	$ 0

POSTRETIREMENT BENEFITS (Detail

POSTRETIREMENT BENEFITS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Shareholders' Equity Charges
Pretax benefit (charge) to shareholders' equity	$ 16.4	$ (59.9)	$ (245.9)
Other Postretirement Benefit Plans, Defined Benefit
Shareholders' Equity Charges
After-tax benefit (charge) to shareholders' equity for other postretirement plans	1.3	(9.6)
Pretax benefit (charge) to shareholders' equity	1.7	$ (12.2)	$ (3.8)
Par outstanding value of non-callable zero coupon bond used to determine the hypothetical yield curve	250
Defined Benefit Plan, Expected Future Benefit Payments in Year One	3
Defined Benefit Plan, Expected Future Benefit Payments in Year Two	3
Defined Benefit Plan, Expected Future Benefit Payments in Year Three	3
Defined Benefit Plan, Expected Future Benefit Payments in Year Four	2
Defined Benefit Plan, Expected Future Benefit Payments in Year Five	$ 2

POSTRETIREMENT BENEFITS (Deta_2

POSTRETIREMENT BENEFITS (Details 1) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	$ 2,119.5	$ 2,888.3
Service cost	5.7	8.4
Interest cost	105.4	61.4	$ 51.3
Actuarial loss (gain)	62	(669.8)
Benefits paid	(146.9)	(145.4)
Foreign currency translation adjustments	9.8	(23.7)
Benefit obligation - end of year	2,148.2	2,119.5	2,888.3
Other Postretirement Benefit Plans, Defined Benefit
Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	34.9	50.5
Service cost	0.7	1.1	1.3
Interest cost	1.8	1.1	1
Actuarial loss (gain)	1.7	(12.2)
Benefits paid	(4.1)	(4.8)
Foreign currency translation adjustments	0.2	(0.8)
Benefit obligation - end of year	35.2	34.9	50.5
Funded status	(35.2)	(34.9)
U.S. | Other Postretirement Benefit Plans, Defined Benefit
Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	28.5	39.3
Service cost	0.6	0.8
Interest cost	1.4	0.8
Actuarial loss (gain)	1.5	(8)
Benefits paid	(3.8)	(4.4)
Foreign currency translation adjustments	0	0
Benefit obligation - end of year	28.2	28.5	39.3
Funded status	(28.2)	(28.5)
Foreign | Other Postretirement Benefit Plans, Defined Benefit
Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	6.4	11.2
Service cost	0.1	0.3
Interest cost	0.4	0.3
Actuarial loss (gain)	0.2	(4.2)
Benefits paid	(0.3)	(0.4)
Foreign currency translation adjustments	0.2	(0.8)
Benefit obligation - end of year	7	6.4	$ 11.2
Funded status	$ (7)	$ (6.4)

POSTRETIREMENT BENEFITS (Deta_3

POSTRETIREMENT BENEFITS (Details 2) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Amounts recognized in consolidated balance sheet [Abstract]
Accrued benefit in current liabilities	$ (6.2)	$ (0.7)
Accrued benefit in noncurrent liabilities	(225.8)	(234.5)
Accumulated other comprehensive loss	552.9	536.7
Net balance sheet impact	322.7	305.4
Other Postretirement Benefit Plans, Defined Benefit
Amounts recognized in consolidated balance sheet [Abstract]
Accrued benefit in current liabilities	(2.7)	(2.9)
Accrued benefit in noncurrent liabilities	(32.5)	(32)
Accumulated other comprehensive loss	8.3	7.2
Net balance sheet impact	(26.9)	(27.7)
U.S. | Other Postretirement Benefit Plans, Defined Benefit
Amounts recognized in consolidated balance sheet [Abstract]
Accrued benefit in current liabilities	(2.4)	(2.6)
Accrued benefit in noncurrent liabilities	(25.8)	(25.9)
Accumulated other comprehensive loss	11	10.3
Net balance sheet impact	(17.2)	(18.2)
Foreign | Other Postretirement Benefit Plans, Defined Benefit
Amounts recognized in consolidated balance sheet [Abstract]
Accrued benefit in current liabilities	(0.3)	(0.3)
Accrued benefit in noncurrent liabilities	(6.7)	(6.1)
Accumulated other comprehensive loss	(2.7)	(3.1)
Net balance sheet impact	$ (9.7)	$ (9.5)

POSTRETIREMENT BENEFITS (Deta_4

POSTRETIREMENT BENEFITS (Details 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Components of Net Periodic Benefit Cost [Abstract]
Service cost	$ 5.7	$ 8.4
Interest cost	105.4	61.4	$ 51.3
Amortization of prior service cost	(0.4)	(0.7)	(0.6)
Net periodic benefit cost	20.7	33	27.5
Included in Pretax Other Comprehensive Income (Loss)
Liability adjustment	16.4	(59.9)	(245.9)
Amortization of prior service costs and actuarial losses	0.2	35.5	54.3
Other Postretirement Benefit Plans, Defined Benefit
Components of Net Periodic Benefit Cost [Abstract]
Service cost	0.7	1.1	1.3
Interest cost	1.8	1.1	1
Amortization of prior service cost	0.1	0.1	0.1
Recognized actuarial loss	0.5	1.5	2.1
Net periodic benefit cost	(3.1)	(3.8)	(4.5)
Included in Pretax Other Comprehensive Income (Loss)
Liability adjustment	1.7	(12.2)	(3.8)
Amortization of prior service costs and actuarial losses	$ (0.6)	$ (1.6)	$ (2.2)

POSTRETIREMENT BENEFITS (Deta_5

POSTRETIREMENT BENEFITS (Details 4) - Other Postretirement Benefit Plans, Defined Benefit	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Weighted Average Assumptions [Abstract]
Discount rate—periodic benefit cost	5.50%	2.80%	2.30%
Discount rate—benefit obligation	5.20%	5.50%	2.80%

POSTRETIREMENT BENEFITS (Deta_6

POSTRETIREMENT BENEFITS (Details 5) - Other Postretirement Benefit Plans, Defined Benefit	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Assumed healthcare cost trend rates [Abstract]
Healthcare cost trend rate assumed for next year	7%	7%
Rate that the cost trend rate gradually declines to	4.50%	4.50%
Year that the rate reaches the ultimate rate	2033	2032

INCOME TAXES (Details)

INCOME TAXES (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Effective Tax Rate Reconciliation, Net Benefit (Expense) from Discrete Items	$ 29.4	$ 60.2	$ 103.6
Effective Tax Rate Adjusted for Discrete Items	24.40%	24.40%	22.50%
Statutory federal tax rate	21%	21%	21%
Operating Loss Carryforwards [Line Items]
Deferred state tax assets relating to net operating losses	$ 14.9
Deferred Tax Assets, Operating Loss Carryforwards	54.1	$ 23.2
State tax credit carryforward	19.3
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	23.1
Valuation allowance	99.5	76.4	$ 70.1
Increases in Valuation Allowances in Foreign Jurisdictions	23.1
Unrecognized tax benefits [Abstract]
Unrecognized Tax Benefits	50.3	51.6	43.4
Impact on the effective tax rate, if recognized	49.9	50.6
Decrease for prior year tax positions	0.5	0.8
Interest and penalties accrued	1.9	1.2
Interest and penalties (benefit) expense	0.7	$ 0.7	$ 0.5
Reasonable possibility that unrecognized tax benefits will decrease over next twelve months	36.9
Foreign
Operating Loss Carryforwards [Line Items]
Net operating loss (NOL) carry-forward	141.4
Deferred Tax Assets, Operating Loss Carryforwards	39.1
Operating Loss Carryforwards Subject to Expiration	67.9
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	16.9
Operating Loss Carryforwards Not Subject to Expiration	73.5
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration	$ 22.2

INCOME TAXES (Details 1)

INCOME TAXES (Details 1) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Components of Income (Loss) Before Taxes
U.S.	$ 456.7	$ 1,231.2	$ 977.3
Foreign	102.6	444.8	561.4
Income before taxes	559.3	1,676	1,538.7
Current:
Federal	96.2	225	139.6
State	19.4	31.1	24.5
Foreign	48	121.7	131.3
Total current income tax (benefit) expense	163.6	377.8	295.4
Deferred:
Federal	(25.3)	(32.1)	39.1
State	(7.9)	(4.3)	6.2
Foreign	(23.1)	7.7	(98.7)
Total deferred income tax (benefit) expense	(56.3)	(28.7)	(53.4)
Income tax provision	$ 107.3	$ 349.1	$ 242

INCOME TAXES (Details 2)

INCOME TAXES (Details 2)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Effective Tax Rate Reconciliation (Percent)
Statutory federal tax rate	21%	21%	21%
State income taxes, net	2.70%	2.30%	1.90%
Foreign rate differential	(1.80%)	1.50%	2.90%
U.S. tax on foreign earnings	1.70%	(0.80%)	0.30%
Salt depletion	(1.70%)	(0.50%)	(0.60%)
Change in valuation allowance	2%	0.40%	(10.40%)
Remeasurement of U.S. state deferred taxes	(0.20%)	(0.80%)	0.10%
Change in tax contingencies	(0.50%)	0.50%	1.50%
Share-based payments	(1.00%)	0.30%	(0.70%)
Return to provision	(3.10%)	(0.60%)	(0.50%)
U.S. federal tax credits	0%	0.10%	0%
Legal entity liquidation	(0.50%)	(2.00%)	0%
Other, net	0.60%	0.20%	0.20%
Effective tax rate	19.20%	20.80%	15.70%

INCOME TAXES (Details 3)

INCOME TAXES (Details 3) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Deferred Tax Assets
Pension and postretirement benefits	$ 42.4	$ 42.9
Environmental reserves	38.3	37.4
Asset retirement obligations	16.6	13.9
Accrued liabilities	46.1	47.4
Lease liabilities	88.1	91.4
Tax credits	47.3	37.4
Net operating losses (NOL)	54.1	23.2
Deferred Tax Assets, Other	3	2.7
Total deferred tax assets	335.9	296.3
Valuation allowance	99.5	76.4	$ 70.1
Net deferred tax assets	236.4	219.9
Deferred Tax Liabilities
Property, plant and equipment	439.5	481.7
Right-of-use lease assets	86.5	89.8
Intangible amortization	76.9	68.7
Inventory and prepaids	5.5	12.1
Taxes on unremitted earnings	16.8	12
Other miscellaneous items	0	2.4
Total deferred tax liabilities	625.2	666.7
Net deferred income tax liability	$ (388.8)	$ (446.8)

INCOME TAXES (Details 4)

INCOME TAXES (Details 4) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Valuation Allowance [Abstract]
Beginning balance	$ 76.4	$ 70.1
Increases to valuation allowances	23.6	14.6
Decreases to valuation allowances	(0.1)	(6.6)
Foreign currency translation adjustments	(0.4)	(1.7)
Ending balance	$ 99.5	$ 76.4

INCOME TAXES (Details 5)

INCOME TAXES (Details 5) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Beginning balance	$ 51,600,000	$ 43,400,000
Increase for current year tax positions	1,700,000	10,300,000
Increase for prior year tax positions	1,300,000	300,000
Decrease for prior year tax positions	500,000	800,000
Reduction due to lapse in statute of limitations	(5,100,000)	0
1300000	1,300,000	(1,600,000)
Ending balance	$ 50,300,000	$ 51,600,000

INCOME TAXES (Details 6)

INCOME TAXES (Details 6)	12 Months Ended
	Dec. 31, 2023
U.S. | U.S Federal Income Tax | Minimum
Income Tax Examination [Line Items]
Tax years	2020
U.S. | U.S Federal Income Tax | Maximum
Income Tax Examination [Line Items]
Tax years	2022
U.S. | U.S State Income Tax | Minimum
Income Tax Examination [Line Items]
Tax years	2012
U.S. | U.S State Income Tax | Maximum
Income Tax Examination [Line Items]
Tax years	2022
Canada | Foreign Income Tax | Minimum
Income Tax Examination [Line Items]
Tax years	2015
Canada | Foreign Income Tax | Maximum
Income Tax Examination [Line Items]
Tax years	2022
Brazil | Foreign Income Tax | Minimum
Income Tax Examination [Line Items]
Tax years	2015
Brazil | Foreign Income Tax | Maximum
Income Tax Examination [Line Items]
Tax years	2022
Germany | Foreign Income Tax | Minimum
Income Tax Examination [Line Items]
Tax years	2015
Germany | Foreign Income Tax | Maximum
Income Tax Examination [Line Items]
Tax years	2022
China | Foreign Income Tax | Minimum
Income Tax Examination [Line Items]
Tax years	2014
China | Foreign Income Tax | Maximum
Income Tax Examination [Line Items]
Tax years	2022
The Netherlands | Foreign Income Tax | Minimum
Income Tax Examination [Line Items]
Tax years	2015
The Netherlands | Foreign Income Tax | Maximum
Income Tax Examination [Line Items]
Tax years	2022

ACCRUED LIABILITIES (Details)

ACCRUED LIABILITIES (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Accrued Liabilities, Current [Abstract]
Accrued compensation and payroll taxes	$ 72	$ 111.9
Non-income tax-related accruals	52.5	51.4
Accrued interest	35.8	35.6
Legal and professional costs	27	41.6
Accrued employee benefits	63.5	64.6
Contract liabilities (current portion only)	34.5	41.1
Environmental (current portion only)	32	25
Asset retirement obligation (current portion only)	9.5	13.7
Restructuring reserves (current portion only)	22.6	13.6
Derivative contracts	31.9	42.5
Other	68.7	67.8
Accrued liabilities	$ 450	$ 508.8

CONTRIBUTING EMPLOYEE OWNERSH_3

CONTRIBUTING EMPLOYEE OWNERSHIP PLAN (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Contribution Plan Disclosure [Line Items]
Contributing Employee Ownership Plan Initial Vesting Period Vested Percentage	25%
Contributing Employee Ownership Plan Vesting Period	2 years
Contributing Employee Ownership Plan Additional Vesting Percentage For Each Additional Year Of Service	25%
Contributing Employee Ownership Plan Vesting Period - Total	5 years
Contributing Employee Ownership Plan Initial Vesting Period Vested Percentage - New	50%
Contributing Employee Ownership Plan Vesting Percentage After Five Years	100%
Contributing Employee Ownership Plan Vesting Period - New	3 years
Defined Contribution Plan Employer Contribution of Eligible Compensation	$ 36.8	$ 37.4	$ 35.4
Defined Contribution Plan Matching Expense	$ 14.5	$ 14.4	$ 14.2
Minimum
Defined Contribution Plan Disclosure [Line Items]
Contribution To Individual Retirement Account Percentage Of Employees Eligible Compensation	5%
Maximum
Defined Contribution Plan Disclosure [Line Items]
Contribution To Individual Retirement Account Percentage Of Employees Eligible Compensation	7.50%

STOCK-BASED COMPENSATION (Detai

STOCK-BASED COMPENSATION (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Share-Based Arrangements, Liability, Current and Noncurrent	$ 0
Stock option and long-term incentive plans, exercisable period (in years)	10 years
Stock options, restricted stock and performance shares vesting period (in years)	3 years
Average exercise period for outstanding options (in months)	70 months
Average exercise period for exercisable options (in months)	59 months
Aggregate intrinsic value for outstanding options	$ 105.9
Aggregate intrinsic value for exercisable options	97.5
Total intrinsic value of options exercised	$ 29.7	$ 36.9	$ 73.1
Total unrecognized compensation, unvested, weighted average recognition period (in years)	1 year 3 months 18 days
Sub-limit for all types of stock awards included in available to be issued stock options	2,595,246
Performance Share Award, Total Shareholder Return Percent	50%
Performance share award cycle (in years)	3
Liability recorded for performance shares to be settled in cash	$ 17
Performance Share Award, Net Income Percent	50%
Stock Purchase Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Committed shares reserved under the stock purchase plans for non employee Directors	262,081
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option and long-term incentive plans, exercisable period (in years)	10 years
Total unrecognized compensation, unvested	$ 15.5
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation, unvested	$ 9.8
Total unrecognized compensation, unvested, weighted average recognition period (in years)	1 year 8 months 12 days

STOCK-BASED COMPENSATION (Det_2

STOCK-BASED COMPENSATION (Details 1) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-Based Payment Arrangement [Abstract]
Stock-based compensation	$ 26.7	$ 25.6	$ 28.4
Mark-to-market adjustments	1.1	(2.5)	24.7
Total expense	$ 27.8	$ 23.1	$ 53.1

STOCK-BASED COMPENSATION (Det_3

STOCK-BASED COMPENSATION (Details 2) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Stock Options Activity [Rollforward]
Outstanding at beginning of year (in shares)	5,438,720
Granted (in shares)	564,124
Exercised (in shares)	(972,080)
Canceled (in shares)	(107,191)
Outstanding at end of year (in shares)	4,923,573	5,438,720
Option Price, outstanding, beginning of period, minimum (in dollars per share)		$ 13.14
Option price, outstanding, beginning of period, maximum (in dollars per share)	$ 65.77
Option price, granted, minimum (in dollars per share)	49.42
Option price, granted, maximum (in dollars per share)	60.55
Option price, exercised, minimum (in dollars per share)	13.14
Option price exercised, maximum (in dollars per share)	50.08
Option price, canceled, minimum (in dollars per share)	23.28
Option price, canceled, maximum (in dollars per share)	60.55
Option price, outstanding, minimum, end of period (in dollars per share)	13.14
Option price, outstanding, maximum, end of period (in dollars per share)	65.77
Weighted average option price, beginning of period (in dollars per share)	29.36
Weighted-average exercise price (in dollars)	60.43
Weighted average option price, exercised (in dollars per share)	26.06
Weighted average option price, canceled (in dollars per share)	44.79
Weighted average option price, outstanding, end of period (in dollars per share)	$ 33.23	$ 29.36
Options exercisable, beginning of period (in shares)	3,740,936
Options exercisable, end of period (in shares)	3,654,274	3,740,936
Weighted average exercise price, exercisable, beginning of period (in dollars per share)	$ 26.50
Weighted average exercise price, exercisable, end of period (in dollars per share)	$ 27.33	$ 26.50

STOCK-BASED COMPENSATION (Det_4

STOCK-BASED COMPENSATION (Details 3)	12 Months Ended
	Dec. 31, 2023 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercisable (in shares) | shares	3,654,274
Options outstanding (in shares) | shares	4,923,573
Under $27.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise price, minimum, (in dollars per share)	$ 0
Range of exercise price, maximum, (in dollars per share)	$ 27
Options exercisable (in shares) | shares	1,586,954
Weighted average exercise price, exercisable (in dollars per share)	$ 20.52
Options outstanding (in shares) | shares	1,586,954
Weighted average exercise price, outstanding (in dollars per share)	$ 20.52
$27.00 - $45.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise price, minimum, (in dollars per share)	27
Range of exercise price, maximum, (in dollars per share)	$ 45
Options exercisable (in shares) | shares	1,843,786
Weighted average exercise price, exercisable (in dollars per share)	$ 30.26
Options outstanding (in shares) | shares	2,107,064
Weighted average exercise price, outstanding (in dollars per share)	$ 30.12
Over $45.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise price, minimum, (in dollars per share)	$ 45
Options exercisable (in shares) | shares	223,534
Weighted average exercise price, exercisable (in dollars per share)	$ 51.53
Options outstanding (in shares) | shares	1,229,555
Weighted average exercise price, outstanding (in dollars per share)	$ 54.98

STOCK-BASED COMPENSATION (Det_5

STOCK-BASED COMPENSATION (Details 4)	Dec. 31, 2023 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Sub-limit for all types of stock awards included in available to be issued stock options (in shares)	2,595,246
2003 Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved for Issuance (in shares)	29,834
Number of shares available for grant or purchase (in shares)	0
2006 Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved for Issuance (in shares)	18,698
Number of shares available for grant or purchase (in shares)	0
2009 Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved for Issuance (in shares)	94,984
Number of shares available for grant or purchase (in shares)	0
2014 Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved for Issuance (in shares)	355,082
Number of shares available for grant or purchase (in shares)	0
2016 Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved for Issuance (in shares)	1,066,818
Number of shares available for grant or purchase (in shares)	0
2018 Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved for Issuance (in shares)	8,054,619
Number of shares available for grant or purchase (in shares)	3,765,408
2021 long term incentive plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved for Issuance (in shares)	2,750,000
Number of shares available for grant or purchase (in shares)	2,582,262
Long Term Incentive Stock Option Plan Reserved for Issuance
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved for Issuance (in shares)	12,370,035
Long Term Incentive Stock Option Plan Available for Grant or Purchase
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant or purchase (in shares)	6,347,670
1997 Stock Plan for Non-employee Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved for Issuance (in shares)	368,778
Number of shares available for grant or purchase (in shares)	106,697

STOCK-BASED COMPENSATION (Det_6

STOCK-BASED COMPENSATION (Details 5)	12 Months Ended
	Dec. 31, 2023 $ / shares shares
To Settle in Cash
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding at beginning of period, performance shares (in shares) | shares	675,016
Granted, performance shares (in shares) | shares	76,455
Paid/Issued, performance shares (in shares) | shares	(357,601)
Performance shares converted to cash | shares	(5,397)
Canceled, performance shares (in shares) | shares	(3,605)
Shares outstanding at end of period, performance shares (in shares) | shares	395,662
Total vested at end of period, performance shares (in shares) | shares	309,835
Weighted average fair value, outstanding at beginning of period, performance shares (in dollars per share) | $ / shares	$ 52.90
Weighted average fair value, granted, performance shares (in dollars per share) | $ / shares	63.08
Weighted average fair value, paid/issued, performance shares (in dollars per share) | $ / shares	52.90
Weighted average fair value, converted from shares to cash, performance shares (in dollars per shares) | $ / shares	37.49
Weighted average fair value, canceled, performance shares (in dollars per share) | $ / shares	54.17
Weighted average fair value, outstanding at end of period, performance shares (in dollars per share) | $ / shares	54.18
Weighted average fair value, total vested at end of period, performance shares (in dollars per share) | $ / shares	$ 54.18
Unvested Performance Shares [Rollforward]
Unvested, beginning of period (in shares) | shares	125,750
Granted (in shares) | shares	76,455
Vested (in shares) | shares	(112,773)
Canceled (in shares) | shares	(3,605)
Unvested, end of period (in shares) | shares	85,827
Weighted average fair value per share, beginning of period (in dollars per share) | $ / shares	$ 52.90
Weighted average fair value per share, granted (in dollars per share) | $ / shares	63.08
Weighted average fair value per share, vested (in dollars per share) | $ / shares	54.18
Weighted average fair value per share, canceled (in dollars per share) | $ / shares	54.17
Weighted average fair value per share, end of period (in dollars per share) | $ / shares	$ 54.18
To Settle in Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding at beginning of period, performance shares (in shares) | shares	388,808
Granted, performance shares (in shares) | shares	91,950
Paid/Issued, performance shares (in shares) | shares	(131,633)
Performance shares converted to cash | shares	(5,397)
Canceled, performance shares (in shares) | shares	(3,876)
Shares outstanding at end of period, performance shares (in shares) | shares	339,852
Total vested at end of period, performance shares (in shares) | shares	249,753
Weighted average fair value, outstanding at beginning of period, performance shares (in dollars per share) | $ / shares	$ 29.94
Weighted average fair value, granted, performance shares (in dollars per share) | $ / shares	63.56
Weighted average fair value, paid/issued, performance shares (in dollars per share) | $ / shares	17.33
Weighted average fair value, converted from shares to cash, performance shares (in dollars per shares) | $ / shares	37.49
Weighted average fair value, canceled, performance shares (in dollars per share) | $ / shares	42.61
Weighted average fair value, outstanding at end of period, performance shares (in dollars per share) | $ / shares	43.65
Weighted average fair value, total vested at end of period, performance shares (in dollars per share) | $ / shares	$ 40.37

STOCK-BASED COMPENSATION (Det_7

STOCK-BASED COMPENSATION (Details 6) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 60.43
Shares granted (in shares)	564,124
Stock options, restricted stock and performance shares vesting period (in years)	3 years
Performance Share Award, Total Shareholder Return Percent	50%
Performance Share Award Cycle	3
Performance Share Award, Net Income Percent	50%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, restricted stock and performance shares vesting period (in years)	3 years
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, restricted stock and performance shares vesting period (in years)		1 year
Black-Sholes Option-Pricing Model
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	1.32%	1.60%	2.76%
Risk-free interest rate	4.07%	1.93%	0.94%
Expected volatility	47%	48%	44%
Expected life (years)	7 years	7 years	6 years
Weighted-average grant fair value (per option) (in dollars)	$ 28.74	$ 21.18	$ 9.91
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 60.43	$ 49.71	$ 28.99
Shares granted (in shares)	564,124	752,100	1,154,700
Monte Carlo Simulation Model
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	4.46%	1.74%	0.23%
Expected volatility	52%	59%	55%
Share Based Compensation Average Correlation Coefficient of Peer Companies	0.51	0.51	0.50
Share Based Compensation Arrangements Expected Volatility of Peer Companies	0.42	0.47	0.50
Performance Share Award, Total Shareholder Return FV	$ 86.98	$ 64.13	$ 39.96
Performance Share Award, Net Income FV	$ 60.55	$ 49.71	$ 28.99
Performance Share Awards, Shares Granted	161,474	184,000	248,700
Expected life (years)	3 years	3 years	3 years

SHAREHOLDERS' EQUITY (Details)

SHAREHOLDERS' EQUITY (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jul. 28, 2022	Nov. 01, 2021	Apr. 26, 2018
Equity, Class of Treasury Stock [Line Items]
Cost of common stock repurchased and retired	$ 711.3	$ 1,350.7	$ 251.9
Stock options exercised (in shares)	1	1.1	3.4
Total value of stock options exercised	$ 25.4	$ 25.7	$ 72.4
Foreign currency translation adjustment [Roll Forward]
Beginning balance	(38.6)	(10.9)	19.4
Unrealized (losses) gains	(1.1)	(27.7)	(30.3)
Reclassification adjustments of (gains) losses into income	0	0	0
Tax benefit (provision)	0	0	0
Net change	(1.1)	(27.7)	(30.3)
Ending balance	(39.7)	(38.6)	(10.9)
Unrealized gains (losses) on derivative contracts (net of taxes) [Roll Forward]
Beginning balance	(32.5)	22.8	21.4
Unrealized losses	(53.6)	(15.6)	182
Reclassification adjustments of (gains) losses into income	72.5	(58.2)	(180.1)
Tax benefit (provision)	(4.8)	18.5	(0.5)
Net change	14.1	(55.3)	1.4
Ending balance	(18.4)	(32.5)	22.8
Pension and postretirement benefits (net of taxes) [Roll Forward]
Beginning balance	(424.8)	(499.9)	(730.7)
Unrealized (losses) gains	(18.1)	72.1	249.7
Reclassification adjustments of (gains) losses into income	0.2	35.5	54.3
Tax benefit (provision)	4.5	(32.5)	(73.2)
Net change	(13.4)	75.1	230.8
Ending balance	(438.2)	(424.8)	(499.9)
Accumulated other comprehensive loss [Roll Forward]
Beginning balance	(495.9)	(488)	(689.9)
Unrealized (losses) gains	(72.8)	28.8	401.4
Reclassification adjustments of (gains) losses into income	72.7	(22.7)	(125.8)
Tax benefit (provision)	(0.3)	(14)	(73.7)
Net change	(0.4)	(7.9)	201.9
Ending balance	$ (496.3)	$ (495.9)	$ (488)
Common Stock
Equity, Class of Treasury Stock [Line Items]
Stock Repurchased and Retired During Period, Shares	13.3	25.7	4.7
Cost of common stock repurchased and retired	$ 711.3	$ 1,350.7	$ 251.9
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	19.2
Cost of common stock repurchased and retired	$ 1,003
Remaining authorized repurchase amount (in dollars)	$ 997
Common Stock | 2021 Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Authorized share repurchase program (in dollars)					$ 1,000
Common Stock | 2018 Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Authorized share repurchase program (in dollars)						$ 500

SEGMENT INFORMATION (Details 1)

SEGMENT INFORMATION (Details 1) - USD ($) $ in Millions	12 Months Ended				93 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2023
Sales [Abstract]
Sales	$ 6,833	$ 9,376.2	$ 8,910.6
Income (loss) before taxes [Abstract]
Income before taxes	(559.3)	(1,676)	(1,538.7)
Environmental expense	23.7	23.2	14
Restructuring charges	(89.6)	(25.3)	(27.9)		$ (386.2)
Goodwill, Impairment Loss	0	0
Other operating income	42.9	16.3	1.4
Interest expense	(181.1)	(143.9)	(348)
Interest income	4.3	2.2	0.2
Non-operating pension income	24	38.7	35.7
Depreciation and amortization expense [Abstract]
Total depreciation and amortization expense	533.4	598.8	582.5
Capital spending [Abstract]
Total capital spending	236	236.9	200.6
Assets
Total assets	7,713.2	8,044.2			7,713.2
Chlor Alkali Products and Vinyls
Sales [Abstract]
Sales	3,995.1	5,085	4,140.8
Income (loss) before taxes [Abstract]
Income before taxes	(664.2)	(1,181.3)	(997.8)
Goodwill, Impairment Loss				$ (557.6)
Depreciation and amortization expense [Abstract]
Total depreciation and amortization expense	440.7	482.2	466.4
Capital spending [Abstract]
Total capital spending	161.1	151.4	130.2
Assets
Total assets	5,650.2	5,782.2			5,650.2
Epoxy
Sales [Abstract]
Sales	1,329.2	2,690.5	3,186
Income (loss) before taxes [Abstract]
Income before taxes	31	(388.5)	(616.5)
Goodwill, Impairment Loss				$ (142.2)
Depreciation and amortization expense [Abstract]
Total depreciation and amortization expense	57.4	83.3	86.1
Capital spending [Abstract]
Total capital spending	15.2	27.2	31
Assets
Total assets	979.3	1,201.9			979.3
Winchester
Sales [Abstract]
Sales	1,508.7	1,600.7	1,583.8
Income (loss) before taxes [Abstract]
Income before taxes	(255.6)	(372.9)	(412.1)
Depreciation and amortization expense [Abstract]
Total depreciation and amortization expense	27.2	24.6	23.3
Capital spending [Abstract]
Total capital spending	33.3	31	28.5
Assets
Total assets	683.6	595			683.6
Corporate/Other
Income (loss) before taxes [Abstract]
Environmental expense	(23.7)	(23.2)	(14)
Other corporate and unallocated costs	(106.3)	(131.5)	(135.1)
Restructuring charges	(89.6)	(25.3)	(27.9)
Depreciation and amortization expense [Abstract]
Total depreciation and amortization expense	8.1	8.7	6.7
Capital spending [Abstract]
Total capital spending	26.4	27.3	$ 10.9
Assets
Total assets	$ 400.1	$ 465.1			$ 400.1

SEGMENT INFORMATION (Details 2)

SEGMENT INFORMATION (Details 2) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	$ 2,519.6	$ 2,674.1
U.S.
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	2,302.7	2,434.4
Foreign
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	$ 216.9	$ 239.7

SEGMENT INFORMATION (Details 3)

SEGMENT INFORMATION (Details 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Sales	$ 6,833	$ 9,376.2	$ 8,910.6
U.S.
Disaggregation of Revenue [Line Items]
Sales	4,599.4	5,722.1	5,268
Europe
Disaggregation of Revenue [Line Items]
Sales	603.7	1,547.8	1,680.8
Other foreign
Disaggregation of Revenue [Line Items]
Sales	1,629.9	2,106.3	1,961.8
Chlor Alkali Products and Vinyls
Disaggregation of Revenue [Line Items]
Sales	3,995.1	5,085	4,140.8
Chlor Alkali Products and Vinyls | Caustic soda
Disaggregation of Revenue [Line Items]
Sales	1,790	2,389.1	1,869.3
Chlor Alkali Products and Vinyls | Chlorine, chlorine derivatives and other products
Disaggregation of Revenue [Line Items]
Sales	2,205.1	2,695.9	2,271.5
Chlor Alkali Products and Vinyls | U.S.
Disaggregation of Revenue [Line Items]
Sales	2,700	3,400	2,839.1
Chlor Alkali Products and Vinyls | Europe
Disaggregation of Revenue [Line Items]
Sales	207.9	331.9	203.5
Chlor Alkali Products and Vinyls | Other foreign
Disaggregation of Revenue [Line Items]
Sales	1,087.2	1,353.1	1,098.2
Epoxy
Disaggregation of Revenue [Line Items]
Sales	1,329.2	2,690.5	3,186
Epoxy | Aromatics and allylics
Disaggregation of Revenue [Line Items]
Sales	525.1	1,338.6	1,450.5
Epoxy | Epoxy resins
Disaggregation of Revenue [Line Items]
Sales	804.1	1,351.9	1,735.5
Epoxy | U.S.
Disaggregation of Revenue [Line Items]
Sales	562.8	855.1	926.7
Epoxy | Europe
Disaggregation of Revenue [Line Items]
Sales	338.5	1,181.8	1,457.9
Epoxy | Other foreign
Disaggregation of Revenue [Line Items]
Sales	427.9	653.6	801.4
Winchester
Disaggregation of Revenue [Line Items]
Sales	1,508.7	1,600.7	1,583.8
Winchester | Commercial
Disaggregation of Revenue [Line Items]
Sales	806.5	1,079.1	1,104.1
Winchester | Military and law enforcement
Disaggregation of Revenue [Line Items]
Sales	702.2	521.6	479.7
Winchester | U.S.
Disaggregation of Revenue [Line Items]
Sales	1,336.6	1,467	1,502.2
Winchester | Europe
Disaggregation of Revenue [Line Items]
Sales	57.3	34.1	19.4
Winchester | Other foreign
Disaggregation of Revenue [Line Items]
Sales	$ 114.8	$ 99.6	$ 62.2

ENVIRONMENTAL (Details 1)

ENVIRONMENTAL (Details 1) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Environmental Remediation Obligations [Abstract]
Accrued liabilities for unasserted claims	$ 11.6
Maximum period for required site OM and M expense accrual (in years)	30 years
Environmental loss contingencies accrual
Beginning balance	$ 146.6	$ 147.3
Provisions charged to income	30.1	24.2	$ 16.2
Remedial and investigatory spending	(25.9)	(24.6)
Other	2.8	(0.3)
Ending balance	153.6	$ 146.6	$ 147.3
Reserves for environmental expenditures-noncurrent	121.6
Future environmental expenditures expected to be utilized over the next 5 years	59.8
Future environmental expenditures expected to be utilized over the next 6 to 10 years	51.2
Future environmental expenditures expected to be utilized beyond 10 years	$ 42.6
Number of sites included in the total estimated environmental liability	58
Number of United States Environmental Protection Agency National Priority List sites	14
Number of sites which constituted the largest portion of the environmental liability	9
Percentage of environmental liability that the larger sites made up	83%
Number of sites which constituted the smallest portion of the environmental liability	49
Percentage of environmental liability any one of the smallest sites made up, maximum	2%
Number of larger sites which are in long-term OM and M	7
Environmental Liability Number of Larger Sites in Remedial Action Plan	7
Environmental Liability Number of Larger Sites in Remedial Design	6
Environmental Liability Number of Larger Sites with Remedial Investigation	4
Percentage of environmental liability any one of the largest sites made up maximum	25%
Environmental Exit Cost [Line Items]
Possible additional contingent environmental liabilities	$ 80
Minimum
Environmental loss contingencies accrual
Expected annual environmental-related cash outlay for site investigation and remediation	25
Environmental Exit Cost [Line Items]
Expected annual environmental-related cash outlay for site investigation and remediation	25
Maximum
Environmental loss contingencies accrual
Expected annual environmental-related cash outlay for site investigation and remediation	35
Environmental Exit Cost [Line Items]
Expected annual environmental-related cash outlay for site investigation and remediation	$ 35

ENVIRONMENTAL (Details 2)

ENVIRONMENTAL (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Environmental Remediation Obligations [Abstract]
Provisions charged to income	$ 30.1	$ 24.2	$ 16.2
Insurance recoveries(1)	(6.4)	(1)	(2.2)
Environmental expense	$ 23.7	$ 23.2	$ 14

LEASES (Details 1)

LEASES (Details 1) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Renewal Term	5 years
Lessee, Operating Lease, Option to Terminate	one year
Operating cash flows from operating leases	$ 88.8	$ 93.1	$ 97.4
Operating cash flows from finance leases	0	0.1	0.1
Financing cash flows from finance leases	1.9	1.1	1.1
Operating Leases, Non-cash increase in lease assets and lease liabilities	71.1	71.8	56.7
Finance Leases, Non-cash increase in lease assets and lease liabilities	$ 0	$ 0	$ 0.1
Operating Lease, Weighted Average Remaining Lease Term	8 years 10 months 24 days	9 years 1 month 6 days
Finance Lease, Weighted Average Remaining Lease Term		1 year 7 months 6 days
Operating Lease, Weighted Average Discount Rate, Percent	4%	3.40%
Finance Lease, Weighted Average Discount Rate, Percent	0%	3.60%
Lessee, Operating Lease, Not yet Commenced, Description [Abstract]
Operating Lease, Lease Not yet Commenced, Expense	$ 1.5
Minimum
Lessee, Operating Lease, Not yet Commenced, Description [Abstract]
Operating Lease, Lease Not yet Commenced, Term of Contract	2 years
Maximum
Lessee, Operating Lease, Not yet Commenced, Description [Abstract]
Operating Lease, Lease Not yet Commenced, Term of Contract	3 years
All Leases | Maximum
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	91 years
All Leases Excluding Land | Maximum
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	14 years

LEASES (Details 2)

LEASES (Details 2) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Balance Sheet Lease Location [Line Items]
Operating lease assets, net	$ 344.7	$ 356
Total leased assets	344.7	358.4
Current operating lease liabilities	69.3	71.8
Operating lease liabilities, noncurrent	283.1	292.5
Total lease liabilities	352.4	366.2
Finance lease, gross value		7.6
Finance lease, accumulated depreciation		5.2
Operating lease assets, net
Balance Sheet Lease Location [Line Items]
Operating lease assets, net	344.7	356
Property, plant and equipment, less accumulated depreciation
Balance Sheet Lease Location [Line Items]
Finance lease assets, net	0	2.4
Current operating lease liabilities
Balance Sheet Lease Location [Line Items]
Current operating lease liabilities	69.3	71.8
Current installments of long-term debt
Balance Sheet Lease Location [Line Items]
Finance lease liabilities, current	0	1
Operating lease liabilities
Balance Sheet Lease Location [Line Items]
Operating lease liabilities, noncurrent	283.1	292.5
Long-term debt
Balance Sheet Lease Location [Line Items]
Finance lease liabilities, noncurrent	$ 0	$ 0.9

LEASES (Details 3)

LEASES (Details 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Operating lease expense	$ 88.4	$ 93.4	$ 97.1
Variable and short-term lease expense	24.6	32.5	28.7
Finance Lease Expense [Abstract]
Depreciation of leased assets	0.5	1	1.1
Interest on lease liabilities	0	0.1	0.1
Total lease expense	$ 113.5	$ 127	$ 127

LEASES (Details 4)

LEASES (Details 4) $ in Millions	Dec. 31, 2023 USD ($)
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
2024	$ 80.9
2025	70.8
2026	55
2027	44
2028	37.1
Thereafter	132.6
Total lease payments	420.4
Less: Imputed interest(1)	(68)
Present value of operating lease liabilities	$ 352.4

COMMITMENTS AND CONTINGENCIES_2

COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Future minimum purchase commitments [Abstract]
2024	$ 564.4
2025	564.8
2026	381.1
2027	370.8
2028	367.6
Thereafter	2,842.5
Total purchase commitments	5,091.2
Legal action liabilities	$ 14.2	$ 14.4

DERIVATIVE FINANCIAL INSTRUME_3

DERIVATIVE FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Derivative, Notional Amount	$ 191	$ 261.2
Forward Contracts
Derivative [Line Items]
Derivative, Notional Amount	21	275.8
Forward Contracts Sell
Derivative [Line Items]
Derivative, Notional Amount	140.2	110.7
Commodity Contract
Derivative [Line Items]
Cash Flow Hedges Derivative Instruments at Fair Value, Net	(24.6)
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	(20.8)
Interest Expense | Interest Rate Swaps Designated As Fair Value Hedges
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ 0	$ (1.8)

DERIVATIVE FINANCIAL INSTRUME_4

DERIVATIVE FINANCIAL INSTRUMENTS (Details 1) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Derivative, Notional Amount	$ 191	$ 261.2
Natural gas
Derivative [Line Items]
Derivative, Notional Amount	63.2	107.6
Ethane
Derivative [Line Items]
Derivative, Notional Amount	26.4	46
Metals
Derivative [Line Items]
Derivative, Notional Amount	$ 101.4	$ 107.6

DERIVATIVE FINANCIAL INSTRUME_5

DERIVATIVE FINANCIAL INSTRUMENTS (Details 2) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 5.3	$ 5.8
Derivative Liability, Fair Value, Gross Liability	32.4	49.9
Foreign Exchange Contract | Other Current Assets | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	0.3
Foreign Exchange Contract | Accrued Liabilities | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	2.5	0.9
Commodity Contract | Other Current Assets | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	2.1	1.5
Commodity Contract | Other Assets | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	3.2	4
Commodity Contract | Accrued Liabilities | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	29.4	41.6
Commodity Contract | Other Liabilities | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	$ 0.5	$ 7.4

DERIVATIVE FINANCIAL INSTRUME_6

DERIVATIVE FINANCIAL INSTRUMENTS (Details 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized losses	$ (53.6)	$ (15.6)	$ 182
Commodity Contract | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized losses	(53.6)	(15.6)	182
Commodity Contract | Cost of Goods Sold | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(72.5)	58.2	180.1
Commodity Contract | Cost of Goods Sold | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(0.6)	0.5	0
Interest Rate Contract Gains | Interest Expense | Fair Value Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	0	(1.8)
Foreign Exchange Contract | Selling and Administration Expenses | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ (15.1)	$ (27.8)	$ (22)