Olin (OLN) 10-Q 2 May 19 2019 Q1 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - USD ($)	3 Months Ended
	Mar. 31, 2019	Jun. 30, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	Olin Corporation
Entity Central Index Key	0000074303
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding	164,859,571
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Current Reporting Status	Yes
Entity Public Float		$ 4,774,200,502

Condensed Balance Sheets

Condensed Balance Sheets - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Current assets:
Cash and cash equivalents	$ 105.7	$ 178.8	$ 109.1
Receivables, net	808.3	776.3	835.6
Income taxes receivable	6.3	5.9	17.5
Inventories, net	717.5	711.4	675.6
Other current assets	46.7	35	61.2
Total current assets	1,684.5	1,707.4	1,699
Property, plant and equipment (less accumulated depreciation of $2,892.4, $2,781.0 and $2,444.2)	3,433.5	3,482.1	3,539.4
Operating lease assets, net	275.1	0	0
Deferred income taxes	31.7	26.3	39.4
Deferred income taxes	31.7	26.3	39.4
Other assets	1,131.4	1,150.4	1,197
Intangible assets, net	494.2	511.6	565.1
Goodwill	2,119.5	2,119.6	2,120.3
Total assets	9,169.9	8,997.4	9,160.2
Current liabilities:
Current installments of long-term debt	126.1	125.9	0.7
Accounts payable	637	636.5	698.2
Income taxes payable	13	22.6	16
Current operating lease liabilities	69.4	0	0
Accrued liabilities	294.4	333.3	256.1
Total current liabilities	1,139.9	1,118.3	971
Long-term debt	3,067.2	3,104.4	3,534.7
Operating lease liabilities	206	0	0
Accrued pension liability	660.2	674.3	628.7
Deferred income taxes	525.9	518.9	498.4
Other liabilities	733.1	749.3	764.3
Total liabilities	6,332.3	6,165.2	6,397.1
Commitments and contingencies
Shareholders’ equity:
Common stock, par value $1 per share: authorized, 240.0 shares; issued and outstanding, 164.9, 165.3 and 167.2 shares	164.9	165.3	167.2
Additional paid-in capital	2,239.2	2,247.4	2,285
Accumulated other comprehensive loss	(656.9)	(651)	(552.8)
Retained earnings	1,090.4	1,070.5	863.7
Total shareholders’ equity	2,837.6	2,832.2	2,763.1
Total liabilities and shareholders’ equity	$ 9,169.9	$ 8,997.4	$ 9,160.2

Condensed Balance Sheets Parent

Condensed Balance Sheets Parenthetical - USD ($) shares in Millions, $ in Millions	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
ASSETS
Accumulated depreciation	$ 2,892.4	$ 2,781	$ 2,444.2
Shareholders' equity:
Common stock, par value	$ 1	$ 1	$ 1
Common stock, authorized (in shares)	240	240	240
Common stock, issued	164.9	165.3	167.2
Common stock, outstanding	164.9	165.3	167.2

Condensed Statements of Operati

Condensed Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Sales	$ 1,553.4	$ 1,710.3
Operating expenses:
Cost of goods sold	1,347.3	1,528.7
Selling and administration	107	100.5
Restructuring charges	4	4
Acquisition-related costs	0	0.3
Other operating income	0.1	8.1
Operating income	95.2	84.9
Earnings of non-consolidated affiliates	0	0.5
Interest expense	57.4	63.7
Interest income	0.2	0.4
Non-operating pension income	3.9	5.4
Other income	11.2	0
Income before taxes	53.1	27.5
Income tax provision	11.4	6.6
Net income	$ 41.7	$ 20.9
Net income per common share:
Basic	$ 0.25	$ 0.13
Diluted	0.25	0.12
Dividends per common share	$ 0.20	$ 0.20
Average common shares outstanding:
Basic	165	167.2
Diluted	166.1	169.2

Condensed Statements of Compreh

Condensed Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net income	$ 41.7	$ 20.9
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments, net	(8.3)	12.4
Unrealized losses on derivative contracts, net	(3.3)	(0.1)
Amortization of prior service costs and actuarial losses, net	5.7	5.4
Total other comprehensive (loss) income, net of tax	(5.9)	17.7
Comprehensive income	$ 35.8	$ 38.6

Condensed Statements of Shareho

Condensed Statements of Shareholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Retained Earnings
Balance (in shares) at Dec. 31, 2017		167.1
Balance at Dec. 31, 2017	$ 2,753.7	$ 167.1	$ 2,280.9	$ (484.6)	$ 790.3
Income tax reclassification adjustment	0	0	0	(85.9)	85.9
Net income	20.9	0	0	0	20.9
Other comprehensive income (loss)	17.7	0	0	17.7	0
Dividends paid:
Common stock ($0.20 per share)	$ (33.4)	$ 0	0	0	(33.4)
Common stock issued for:
Stock options exercised (in shares)	0.1	0.1
Stock options exercised	$ 1	$ 0.1	0.9	0	0
Other Transactions (in shares)		0
Other Transactions	0.5	$ 0	0.5	0	0
Stock-based compensation	2.7	$ 0	2.7	0	0
Balance (in shares) at Mar. 31, 2018		167.2
Balance at Mar. 31, 2018	2,763.1	$ 167.2	2,285	(552.8)	863.7
Balance (in shares) at Dec. 31, 2018		165.3
Balance at Dec. 31, 2018	2,832.2	$ 165.3	2,247.4	(651)	1,070.5
Lease accounting adoption adjustment	11.2	0	0	0	11.2
Net income	41.7	0	0	0	41.7
Other comprehensive income (loss)	(5.9)	0	0	(5.9)	0
Dividends paid:
Common stock ($0.20 per share)	(33)	$ 0	0	0	(33)
Common stock repurchased and retired (in shares)		(0.6)
Common stock repurchased and retired	$ (13.2)	$ (0.6)	(12.6)	0	0
Common stock issued for:
Stock options exercised (in shares)	0.1	0.1
Stock options exercised	$ 1.4	$ 0.1	1.3	0	0
Other Transactions (in shares)		0.1
Other Transactions	0.4	$ 0.1	0.3	0	0
Stock-based compensation	2.8	$ 0	2.8	0	0
Balance (in shares) at Mar. 31, 2019		164.9
Balance at Mar. 31, 2019	$ 2,837.6	$ 164.9	$ 2,239.2	$ (656.9)	$ 1,090.4

Condensed Statements of Share_2

Condensed Statements of Shareholders' Equity Parenthetical - $ / shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Stockholders' Equity [Abstract]
Dividends Paid, Common Stock, per share	$ 0.20	$ 0.20

Condensed Statements of Cash Fl

Condensed Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating Activities
Net income	$ 41.7	$ 20.9
Adjustments to reconcile net income to net cash and cash equivalents provided by (used for) operating activities:
Gain on disposition of non-consolidated affiliate	(11.2)	0
Earnings of non-consolidated affiliates	0	(0.5)
Losses on disposition of property, plant and equipment	0	0.1
Stock-based compensation	3.3	3.1
Depreciation and amortization	152.9	146.7
Deferred income taxes	(3)	(18.9)
Qualified pension plan contributions	(0.1)	(0.5)
Qualified pension plan income	(2)	(3.8)
Change in:
Receivables	(36.2)	(102.5)
Income taxes receivable/payable	(9.9)	6
Inventories	(11.2)	14.9
Other current assets	(12.4)	(16.7)
Accounts payable and accrued liabilities	(17.9)	25.1
Other assets	2.9	3.1
Other noncurrent liabilities	6.4	0.3
Other operating activities	1	3.6
Net operating activities	104.3	80.9
Investing Activities
Capital expenditures	(102.2)	(89.5)
Proceeds from disposition of property, plant and equipment	0	0.1
Proceeds from disposition of non-consolidated affiliate	20	0
Net investing activities	(82.2)	(89.4)
Long-term debt:
Borrowings	0	550.3
Repayments	(50.2)	(609.9)
Common stock repurchased and retired	(13.2)	0
Stock options exercised	1.4	1
Dividends paid	(33)	(33.4)
Debt issuance costs	0	(8.5)
Net financing activities	(95)	(100.5)
Effect of exchange rate changes on cash and cash equivalents	(0.2)	(0.3)
Net decrease in cash and cash equivalents	(73.1)	(109.3)
Cash and cash equivalents, beginning of period	178.8	218.4
Cash and cash equivalents, end of period	105.7	109.1
Cash paid for interest and income taxes:
Interest, net	52.3	41.4
Income taxes, net of refunds	17.8	14.5
Non-cash investing activities:
Decrease in capital expenditures included in accounts payable and accrued liabilities	$ 20.6	$ 12.1

DESCRIPTION OF BUSINESS

DESCRIPTION OF BUSINESS	3 Months Ended
	Mar. 31, 2019
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 manufacturer concentrated in three business segments: Chlor Alkali Products and Vinyls, Epoxy and Winchester. The Chlor Alkali Products and Vinyls segment manufactures and sells chlorine and caustic soda, ethylene dichloride (EDC) and vinyl chloride monomer, methyl chloride, methylene chloride, chloroform, carbon tetrachloride, perchloroethylene, trichloroethylene and vinylidene chloride, hydrochloric acid, hydrogen, bleach products and potassium hydroxide. The Epoxy segment produces and sells a full range of epoxy materials, including allyl chloride, epichlorohydrin, liquid epoxy resins, solid epoxy resins and downstream products such as differentiated epoxy resins and additives. The Winchester segment produces and sells sporting ammunition, reloading components, small caliber military ammunition and components, and industrial cartridges. We have prepared the condensed financial statements included herein, without audit, pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (SEC). The preparation of the financial statements requires estimates and assumptions that affect amounts reported and disclosed in the financial statements and related notes. In our opinion, these financial statements reflect all adjustments (consisting only of normal accruals), which are necessary to present fairly the results for interim periods. Certain information and footnote disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles have been condensed or omitted pursuant to such rules and regulations; however, we believe that the disclosures are appropriate. We recommend that you read these condensed financial statements in conjunction with the financial statements, accounting policies and the notes thereto and Management’s Discussion and Analysis of Financial Condition and Results of Operations included in our Annual Report on Form 10-K for the year ended December 31, 2018 . Certain reclassifications were made to prior year amounts to conform to the 2019 presentation.

ACCOUNTING POLICIES

ACCOUNTING POLICIES	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
ACCOUNTING POLICIES	NOTE 2 . ACCOUNTING POLICIES Leases In February 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2016-02 “Leases,” (ASU 2016-02) which supersedes Accounting Standards Codification (ASC) 840 “Leases” and creates a new topic, ASC 842 “Leases” (ASC 842). Subsequent to the issuance of ASU 2016-02, ASC 842 was amended by various updates that amend and clarify the impact and implementation of the aforementioned update. Upon initial application, the provisions of these updates are required to be applied using the modified retrospective method which requires retrospective adoption to each prior reporting period presented with the cumulative effect of adoption recorded to the earliest reporting period presented. An optional transition method can be utilized which requires application of these updates beginning on the date of adoption with the cumulative effect of initially applying these updates recognized at the date of initial adoption. We adopted these updates on January 1, 2019 using the optional transition method. Consequently, our comparative periods have not been retrospectively adjusted for the new lease requirements. In addition, we elected the following practical expedients: – We elected the package of practical expedients permitted under the transition guidance within the new standard, which among other things, allowed us to carry forward the historical lease classification. – We elected the practical expedient related to land easements, allowing us to carry forward our accounting treatment for land easements on existing agreements. – We elected the short-term practical expedient for all classes of lease assets, which allows us to not record leases with an initial term of 12 months or less on the balance sheet, and instead recognize the expense straight-line over the lease term. – We elected the practical expedient to not separate lease components from non-lease components for all asset classes. Adoption of these updates resulted in the recording of operating lease assets and lease liabilities on our condensed balance sheet of $291.9 million as of January 1, 2019. Our assets and liabilities for finance leases remained unchanged. We also recognized the cumulative effect of applying these updates as an adjustment to retained earnings of $11.2 million , net of tax, which was primarily related to the recognition of previously deferred sale/leaseback gains. Our condensed statements of operations and cash flows, along with our compliance with all covenants and restrictions under all our outstanding credit agreements, were not impacted by this adoption. 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.

ACQUISITION

ACQUISITION	3 Months Ended
	Mar. 31, 2019
Acquisition [Abstract]
ACQUISITION	NOTE 3 . ACQUISITION On October 5, 2015 (the Closing Date), we completed the acquisition (the Acquisition) from The Dow Chemical Company (Dow) (a wholly owned subsidiary of Dow Inc., which was separated from DowDupont Inc. on April 1, 2019) of its U.S. Chlor Alkali and Vinyl, Global Chlorinated Organics and Global Epoxy businesses (collectively, the Acquired Business), whose operating results are included in the accompanying financial statements since the Closing Date. We incurred costs related to the integration of the Acquired Business of $0.3 million for the three months ended March 31, 2018 .

RESTRUCTURING CHARGES

RESTRUCTURING CHARGES	3 Months Ended
	Mar. 31, 2019
Restructuring and Related Activities [Abstract]
RESTRUCTURING CHARGES	NOTE 4 . RESTRUCTURING CHARGES On December 10, 2018, we announced that we had made the decision to permanently close the ammunition assembly operations at our Winchester facility in Geelong, Australia. Subsequent to the facility’s closure, product for customers in the region will be sourced from Winchester manufacturing facilities located in the United States. For the three months ended March 31, 2019 , we recorded pretax restructuring charges of $0.1 million for lease and other contract termination costs related to this action. We expect to incur additional restructuring charges through 2019 of approximately $1 million related to this closure. For the three months ended March 31, 2019 , we recorded additional pretax restructuring charges of $1.4 million for employee severance and related benefit costs related to our Winchester operations. 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. Associated with this action, we have permanently closed our Henderson, NV chlor alkali plant with 153,000 tons of capacity and have reconfigured the site to manufacture bleach and distribute caustic soda and hydrochloric acid. Also, the capacity of our Niagara Falls, NY chlor alkali plant has been reduced from 300,000 tons to 240,000 tons and the chlor alkali capacity at our Freeport, TX facility was reduced by 220,000 tons. This 220,000 ton reduction was entirely from diaphragm cell capacity. For the three months ended March 31, 2019 and 2018 , we recorded pretax restructuring charges of $2.5 million and $3.0 million , respectively, for facility exit costs and lease and other contract termination costs related to these actions. We expect to incur additional restructuring charges through 2019 of approximately $8 million related to these capacity reductions. For the three months ended March 31, 2018 , we recorded pretax restructuring charges of $1.0 million for facility exit costs related to our permanent reduction in capacity at our Becancour, Canada chlor alkali facility in 2014. We expect to incur additional restructuring charges through 2019 of less than $1 million related to this action. The following table summarizes the 2019 and 2018 activities by major component of these restructuring actions and the remaining balances of accrued restructuring costs as of March 31, 2019 and 2018 : Employee severance and related benefit costs Lease and other contract termination costs Facility exit costs Total ($ in millions) Balance at January 1, 2018 $ 1.8 $ 3.3 $ — $ 5.1 Restructuring charges — 0.4 3.6 4.0 Amounts utilized (0.5 ) (0.8 ) (1.5 ) (2.8 ) Balance at March 31, 2018 $ 1.3 $ 2.9 $ 2.1 $ 6.3 Balance at January 1, 2019 $ 1.5 $ 6.0 $ 0.7 $ 8.2 Restructuring charges 1.4 0.1 2.5 4.0 Amounts utilized (0.7 ) (0.6 ) (2.4 ) (3.7 ) Balance at March 31, 2019 $ 2.2 $ 5.5 $ 0.8 $ 8.5 The following table summarizes the cumulative restructuring charges of these 2018, 2016 and 2014 restructuring actions by major component through March 31, 2019 : Chlor Alkali Products and Vinyls Winchester Total Becancour Capacity Reductions ($ in millions) Write-off of equipment and facility $ 3.5 $ 78.1 $ 2.6 $ 84.2 Employee severance and related benefit costs 2.7 5.9 2.7 11.3 Facility exit costs 5.9 36.3 — 42.2 Employee relocation costs — 1.7 — 1.7 Lease and other contract termination costs 6.1 40.2 0.3 46.6 Total cumulative restructuring charges $ 18.2 $ 162.2 $ 5.6 $ 186.0 As of March 31, 2019 , we have incurred cash expenditures of $92.9 million and non-cash charges of $84.6 million related to these restructuring actions. The remaining balance of $8.5 million is expected to be paid out through 2020 .

ACCOUNTS RECEIVABLE

ACCOUNTS RECEIVABLE	3 Months Ended
	Mar. 31, 2019
Receivables [Abstract]
ACCOUNTS RECEIVABLE	NOTE 5 . ACCOUNTS RECEIVABLES On December 20, 2016, we entered into a three -year, $250.0 million Receivables Financing Agreement with PNC Bank, National Association, as administrative agent (Receivables Financing Agreement). 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 leverage and coverage covenants that are contained in the senior revolving credit facility. As of March 31, 2019 , $352.8 million of our trade receivables were pledged as collateral and we had $125.0 million drawn under the agreement. As of March 31, 2019 , we had $125.0 million additional borrowing capacity under the Receivables Financing Agreement. As of December 31, 2018 , $360.4 million of our trade receivables were pledged as collateral and $125.0 million was drawn under the agreement and as of March 31, 2018 , $382.7 million of our trade receivables were pledged as collateral and we had $230.3 million drawn under the agreement. Olin also has trade accounts receivable factoring arrangements (AR Facilities) and pursuant to the terms of the AR Facilities, certain of our subsidiaries may sell their accounts receivable up to a maximum of $315.0 million . We will continue to service the outstanding accounts sold. These receivables qualify for sales treatment under ASC 860 “Transfers and Servicing” and, accordingly, the proceeds are included in net cash provided by operating activities in the condensed statements of cash flows. The following table summarizes the AR Facilities activity: March 31, 2019 2018 ($ in millions) Balance at beginning of year $ 132.4 $ 182.3 Gross receivables sold 134.9 413.1 Payments received from customers on sold accounts (170.5 ) (416.5 ) Balance at end of period $ 96.8 $ 178.9 The factoring discount paid under the AR Facilities is recorded as interest expense on the condensed statements of operations. The factoring discount was $0.5 million and $1.2 million for the three months ended March 31, 2019 and 2018 , respectively. The agreements are without recourse and therefore no recourse liability had been recorded as of March 31, 2019 , December 31, 2018 , or March 31, 2018 .

ALLOWANCE FOR DOUBTFUL ACCOUNTS

ALLOWANCE FOR DOUBTFUL ACCOUNTS RECEIVABLES	3 Months Ended
	Mar. 31, 2019
Accounts Receivable, Net [Abstract]
ALLOWANCE FOR DOUBTFUL ACCOUNTS RECEIVABLES	NOTE 6 . ALLOWANCE FOR DOUBTFUL ACCOUNTS RECEIVABLES We evaluate the collectibility of accounts receivable based on a combination of factors. We estimate an allowance for doubtful accounts as a percentage of net sales based on historical bad debt experience. 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. Allowance for doubtful accounts receivable consisted of the following: March 31, 2019 2018 ($ in millions) Balance at beginning of year $ 12.9 $ 12.3 Provisions charged 0.5 1.1 Write-offs, net of recoveries (0.1 ) — Foreign currency translation adjustment (0.1 ) — Balance at end of period $ 13.2 $ 13.4

INVENTORIES

INVENTORIES	3 Months Ended
	Mar. 31, 2019
Inventory Disclosure [Abstract]
INVENTORIES	NOTE 7 . INVENTORIES Inventories consisted of the following: March 31, 2019 December 31, March 31, 2018 ($ in millions) Supplies $ 70.3 $ 66.4 $ 65.7 Raw materials 73.5 66.7 75.3 Work in process 145.6 139.6 139.8 Finished goods 498.7 488.5 440.8 788.1 761.2 721.6 LIFO reserve (70.6 ) (49.8 ) (46.0 ) Inventories, net $ 717.5 $ 711.4 $ 675.6 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. Cost for other inventories has been determined principally by the average-cost method (primarily operating supplies, spare parts and maintenance parts). Elements of costs in inventories included raw materials, direct labor and manufacturing overhead. Inventories under the LIFO method are based on annual estimates of quantities and costs as of year-end; therefore, the condensed financial statements at March 31, 2019 reflect certain estimates relating to inventory quantities and costs at December 31, 2019 . The replacement cost of our inventories would have been approximately $70.6 million , $49.8 million and $46.0 million higher than reported at March 31, 2019 , December 31, 2018 and March 31, 2018 , respectively.

OTHER ASSETS

OTHER ASSETS	3 Months Ended
	Mar. 31, 2019
Other Assets [Abstract]
OTHER ASSETS	NOTE 8 . OTHER ASSETS Included in other assets were the following: March 31, 2019 December 31, 2018 March 31, 2018 ($ in millions) Supply contracts $ 1,090.1 $ 1,099.5 $ 1,127.7 Investments in non-consolidated affiliates — 8.8 29.0 Other 41.3 42.1 40.3 Other assets $ 1,131.4 $ 1,150.4 $ 1,197.0 On January 1, 2019, we sold our 9.1% limited partnership interest in Bay Gas Storage Company, Ltd. (Bay Gas) for $20.0 million . The sale closed on February 7, 2019 which resulted in a gain of $11.2 million for the three months ended March 31, 2019 which was recorded to other income in the condensed statements of operations. During the second quarter of 2018, we recorded a $21.5 million non-cash impairment charge related to an adjustment to the value of our interest in Bay Gas. Bay Gas owns, leases and operates underground gas storage and related pipeline facilities which are used to provide storage in the McIntosh, AL area and delivery of natural gas. The general partner, Sempra Energy (Sempra), announced in the second quarter of 2018 its plan to sell several assets including its 90.9% interest in Bay Gas. In connection with this decision, Sempra recorded an impairment charge related to Bay Gas adjusting the related assets’ carrying values to an estimated fair value. We recorded a reduction in our investment in the non-consolidated affiliate for the proportionate share of the non-cash impairment charge. Olin has no other non-consolidated affiliates. In connection with the Acquisition, Olin and Dow entered into arrangements for the long-term supply of ethylene by Dow to Olin, pursuant to which, among other things, Olin made upfront payments in order to receive ethylene at producer economics and for certain reservation fees and for the option to obtain additional ethylene at producer economics. During 2016, we exercised one of the options to reserve additional ethylene at producer economics. During 2017, a payment of $209.4 million was made in connection with this option which increased the value of the long-term asset. On February 27, 2017, we exercised the remaining option to reserve additional ethylene at producer economics from Dow. In connection with the exercise of this option, we also secured a long-term customer arrangement. As a result, an additional payment will be made to Dow of between $440 million and $465 million on or about the fourth quarter of 2020. During 2017, as a result of Dow’s Texas 9 ethylene cracker becoming operational, Olin recognized a long-term asset and other liabilities of $389.2 million , which represented the present value of the additional estimated payment. The discounted amount of $51.8 million will be recorded as interest expense through the fourth quarter of 2020. For the three months ended March 31, 2019 and 2018 , interest expense of $4.0 million and $3.9 million , respectively, was recorded for accretion on the 2020 payment discount. Amortization expense of $9.4 million for both the three months ended March 31, 2019 and 2018 was recognized within cost of goods sold related to these supply contracts and is reflected in depreciation and amortization on the condensed statements of cash flows. The long-term supply contracts are monitored for impairment each reporting period.

GOODWILL AND INTANGIBLES

GOODWILL AND INTANGIBLES	3 Months Ended
	Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND INTANGIBLES	NOTE 9 . GOODWILL AND INTANGIBLE ASSETS Changes in the carrying value of goodwill were as follows: Chlor Alkali Products and Vinyls Epoxy Total ($ in millions) Balance at January 1, 2018 $ 1,832.9 $ 287.1 $ 2,120.0 Foreign currency translation adjustment 0.2 0.1 0.3 Balance at March 31, 2018 $ 1,833.1 $ 287.2 $ 2,120.3 Balance at January 1, 2019 $ 1,832.6 $ 287.0 2,119.6 Foreign currency translation adjustment (0.1 ) — (0.1 ) Balance at March 31, 2019 $ 1,832.5 $ 287.0 $ 2,119.5 Intangible assets consisted of the following: March 31, 2019 December 31, 2018 March 31, 2018 Gross Amount Accumulated Amortization Net Gross Amount Accumulated Amortization Net Gross Amount Accumulated Amortization Net ($ in millions) Customers, customer contracts and relationships $ 673.3 $ (223.9 ) $ 449.4 $ 675.2 $ (211.9 ) $ 463.3 $ 682.0 $ (176.3 ) $ 505.7 Trade name 7.0 (4.9 ) 2.1 7.0 (4.6 ) 2.4 7.1 (3.6 ) 3.5 Acquired technology 85.1 (42.5 ) 42.6 85.4 (39.6 ) 45.8 86.5 (30.9 ) 55.6 Other 0.7 (0.6 ) 0.1 0.7 (0.6 ) 0.1 2.3 (2.0 ) 0.3 Total intangible assets $ 766.1 $ (271.9 ) $ 494.2 $ 768.3 $ (256.7 ) $ 511.6 $ 777.9 $ (212.8 ) $ 565.1

EARNINGS PER SHARE

EARNINGS PER SHARE	3 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
EARNINGS PER SHARE	NOTE 10 . EARNINGS PER SHARE Basic and diluted net income per share are computed by dividing net income by the weighted-average number of common shares outstanding. Diluted net income per share reflects the dilutive effect of stock-based compensation. Three Months Ended March 31, 2019 2018 Computation of Income per Share (In millions, except per share data) Net income $ 41.7 $ 20.9 Basic shares 165.0 167.2 Basic net income per share $ 0.25 $ 0.13 Diluted shares: Basic shares 165.0 167.2 Stock-based compensation 1.1 2.0 Diluted shares 166.1 169.2 Diluted net income per share $ 0.25 $ 0.12 The computation of dilutive shares from stock-based compensation does not include 5.6 million shares and 2.5 million shares for the three months ended March 31, 2019 and 2018 , respectively, as their effect would have been anti-dilutive.

ENVIRONMENTAL

ENVIRONMENTAL	3 Months Ended
	Mar. 31, 2019
Environmental Remediation Obligations [Abstract]
ENVIRONMENTAL	NOTE 11 . ENVIRONMENTAL We are party to various government and private environmental actions associated with past manufacturing facilities and former waste disposal sites. The condensed balance sheets included reserves for future environmental expenditures to investigate and remediate known sites amounting to $125.5 million , $125.6 million and $131.2 million at March 31, 2019 , December 31, 2018 and March 31, 2018 , respectively, of which $108.5 million , $108.6 million and $111.2 million , respectively, were classified as other noncurrent liabilities. Environmental provisions charged to income, which are included in cost of goods sold, were $1.8 million and $2.3 million for the three months ended March 31, 2019 and 2018 , respectively. Environmental exposures are difficult to assess for numerous reasons, including the identification of new sites, developments at sites resulting from investigatory studies, advances in technology, changes in environmental laws and regulations and their application, changes in regulatory authorities, the scarcity of reliable data pertaining to identified sites, the difficulty in assessing the involvement and financial capability of other Potentially Responsible Parties (PRPs), our ability to obtain contributions from other parties and the lengthy time periods over which site remediation occurs. It is possible that some of these matters (the outcomes of which are subject to various uncertainties) may be resolved unfavorably to us, which could materially adversely affect our financial position or results of operations. In connection with the October 5, 2015 acquisition of Dow’s U.S. Chlor Alkali and Vinyl, Global Chlorinated Organics and Global Epoxy businesses, the prior owner of the businesses retained liabilities relating to releases of hazardous materials and violations of environmental law to the extent arising prior to October 5, 2015.

LEASES

LEASES	3 Months Ended
	Mar. 31, 2019
Leases [Abstract]
LEASES	NOTE 12 . 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 96 years , 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 condensed balance sheet include: March 31, 2019 Assets: Balance sheet location: ($ in millions) Operating Operating lease assets, net $ 275.1 Finance Property, plant and equipment, less accumulated depreciation (1) 5.9 Total lease assets $ 281.0 Liabilities: Current Operating Current operating lease liabilities $ 69.4 Finance Current installments of long-term debt 1.1 Long-term Operating Operating lease liabilities 206.0 Finance Long-term debt 4.7 Total lease liabilities $ 281.2 (1) As of March 31, 2019 , assets recorded under finance leases were $9.4 million and accumulated depreciation associated with finance leases was $3.5 million . The components of lease expense are recorded to cost of goods sold and selling and administration expenses in the condensed statement of operations, excluding interest on finance lease liabilities which is recorded to interest expense. The components of lease expense were as follows: Three Months Ended March 31, 2019 Lease expense: ($ in millions) Operating $ 22.2 Other operating lease expense (1) 6.9 Finance: Depreciation of leased assets 0.3 Interest on lease liabilities 0.1 Total lease expense $ 29.5 (1) Includes costs associated with short-term leases and variable lease expenses. The maturities of lease liabilities were as follows: March 31, 2019 Operating leases Finance leases Total ($ in millions) 2019 $ 59.7 $ 1.0 $ 60.7 2020 62.9 2.1 65.0 2021 45.6 0.8 46.4 2022 32.3 0.8 33.1 2023 23.8 0.6 24.4 Thereafter 101.1 1.0 102.1 Total lease payments 325.4 6.3 331.7 Less: Imputed interest (1) (50.0 ) (0.5 ) (50.5 ) Present value of lease liabilities $ 275.4 $ 5.8 $ 281.2 (1) Calculated using the discount rate for each lease. As previously disclosed in our 2018 Annual Report on Form 10-K and under ASC 840, the previous lease accounting standard, future minimum lease payments for non-cancelable operating leases were expected to be as follows: December 31, 2018 ($ in millions) 2019 $ 82.2 2020 61.4 2021 44.2 2022 31.8 2023 23.2 Thereafter 102.6 Total lease payments $ 345.4 Other information related to leases was as follows: Three Months Ended March 31, 2019 Supplemental cash flows information: ($ in millions) Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 22.0 Operating cash flows from finance leases 0.1 Financing cash flows from finance leases 0.2 Non-cash increase in lease assets and lease liabilities: Operating leases $ 3.6 Finance leases 1.9 Weighted-average remaining lease term: March 31, 2019 Operating leases 9.3 years Finance leases 3.8 years Weighted-average discount rate: Operating leases 3.33 % Finance leases 3.34 % As of March 31, 2019 , we have additional operating leases for office space that have not yet commenced of approximately $20 million which are expected to commence during the second and third quarters of 2019 with lease terms of approximately 10 years . We also have additional operating leases for railcars that have not yet commenced of approximately $9 million which are expected to commence during the second quarter of 2019 with lease terms between 5 years and 12 years .

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	3 Months Ended
	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	NOTE 13 . COMMITMENTS AND CONTINGENCIES We are party to a dispute relating to a contract at our Plaquemine, LA facility. The other party to the contract filed a demand for arbitration alleging, among other things, that Olin breached the contract, and claims damages in excess of the amount Olin believes it is obligated to pay under the contract. The arbitration hearing is scheduled for the fourth quarter 2019. Any additional losses related to this contract dispute are not currently estimable because of unresolved questions of fact and law but, if resolved unfavorably to Olin, they could have a material adverse effect on our financial position, cash flows or results of operations. 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. The 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. The other defendants named in the lawsuits are Occidental Petroleum Corporation, Occidental Chemical Corporation d/b/a OxyChem, Westlake Chemical Corporation, Shin-Etsu Chemical Co., Ltd., Shintech Incorporated, Formosa Plastics Corporation, and Formosa Plastics Corporation, U.S.A. The lawsuits are filed 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. directly from one or more of the defendants, their parents, predecessors, subsidiaries or affiliates at any time between October 1, 2015 and the present. Plaintiffs seek an unspecified amount of damages and injunctive relief. We believe we have meritorious legal positions and will continue to represent our interests vigorously in this matter. Any losses related to this matter are not currently estimable because of unresolved questions of fact and law which, if resolved unfavorably to Olin, could have a material adverse effect on our financial position, cash flows or results of operations. We, and our subsidiaries, are defendants in various other legal actions (including proceedings based on alleged exposures to asbestos) incidental to our past and current business activities. As of March 31, 2019 , December 31, 2018 and March 31, 2018 , our condensed balance sheets included accrued liabilities for these legal actions of $15.8 million , $15.6 million and $13.3 million , respectively. These liabilities do not include costs associated with legal representation. Based on our analysis, and considering the inherent uncertainties associated with litigation, we do not believe that it is reasonably possible that these legal actions will materially adversely affect our financial position, cash flows or results of operations. In connection with the October 5, 2015 acquisition of Dow’s U.S. Chlor Alkali and Vinyl, Global Chlorinated Organics and Global Epoxy businesses, the prior owner of the businesses retained liabilities related to litigation to the extent arising prior to October 5, 2015. 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.

SHAREHOLDERS' EQUITY

SHAREHOLDERS' EQUITY	3 Months Ended
	Mar. 31, 2019
Stockholders' Equity Note [Abstract]
SHAREHOLDERS' EQUITY	NOTE 14 . SHAREHOLDERS’ EQUITY 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 will terminate upon the purchase of $500.0 million of our common stock. For the three months ended March 31, 2019 , 0.6 million shares were repurchased and retired at a cost of $13.2 million . As of March 31, 2019 , we had repurchased a total of $63.3 million of our common stock, representing 2.7 million shares, and $436.7 million of common stock remained authorized to be repurchased. We issued 0.1 million shares representing stock options exercised for both the three months ended March 31, 2019 and 2018 , with a total value of $1.4 million and $1.0 million , respectively. In February 2018, the FASB issued ASU 2018-02, “Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income” (ASU 2018-02) which amends ASC 220 “Income Statement—Reporting Comprehensive Income.” This update allows a reclassification from accumulated other comprehensive loss to retained earnings for the stranded tax effects resulting from the U.S. Tax Cuts and Jobs Act (the 2017 Tax Act) during each fiscal year or quarter in which the effect of the lower tax rate is recorded. We adopted this update in March 2018 and reclassified $85.9 million related to the deferred gain resulting from the 2017 Tax Act from accumulated other comprehensive loss to retained earnings. The following table represents the activity included in accumulated other comprehensive loss: Foreign Currency Translation Adjustment (net of taxes) Unrealized Gains (Losses) on Derivative Contracts (net of taxes) Pension and Other Postretirement Benefits (net of taxes) Accumulated Other Comprehensive Loss ($ in millions) Balance at January 1, 2018 $ 7.6 $ 11.1 $ (503.3 ) $ (484.6 ) Unrealized gains 12.4 2.1 — 14.5 Reclassification adjustments of (gains) losses into income — (2.3 ) 9.4 7.1 Tax benefit (provision) — 0.1 (4.0 ) (3.9 ) Net change 12.4 (0.1 ) 5.4 17.7 Income tax reclassification adjustment 15.3 2.4 (103.6 ) (85.9 ) Balance at March 31, 2018 $ 35.3 $ 13.4 $ (601.5 ) $ (552.8 ) Balance at January 1, 2019 $ 0.7 $ 1.8 $ (653.5 ) $ (651.0 ) Unrealized losses (8.3 ) (6.6 ) — (14.9 ) Reclassification adjustments of losses into income — 2.2 7.4 9.6 Tax benefit (provision) — 1.1 (1.7 ) (0.6 ) Net change (8.3 ) (3.3 ) 5.7 (5.9 ) Balance at March 31, 2019 $ (7.6 ) $ (1.5 ) $ (647.8 ) $ (656.9 ) Net income, 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 and non-operating pension income included the amortization of prior service costs and actuarial losses from accumulated other comprehensive loss.

SEGMENT INFORMATION

SEGMENT INFORMATION	3 Months Ended
	Mar. 31, 2019
Segment Reporting [Abstract]
SEGMENT INFORMATION	NOTE 15 . SEGMENT INFORMATION We define segment results as income (loss) before interest expense, interest income, other operating income (expense), non-operating pension income, other income and income taxes, and includes the operating results of non-consolidated affiliates. Consistent with the guidance in ASC 280 “Segment Reporting,” we have determined it is appropriate to include the operating results of non-consolidated affiliates in the relevant segment financial results. 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 used in our Epoxy segment is transferred at cost from the Chlor Alkali Products and Vinyls segment. Sales and profits are recognized in the Chlor Alkali Products and Vinyls segment for all caustic soda generated and sold by Olin. Sales are attributed to geographic areas based on customer location. Three Months Ended March 31, 2019 2018 Sales: ($ in millions) Chlor Alkali Products and Vinyls $ 872.2 $ 936.1 Epoxy 524.0 603.3 Winchester 157.2 170.9 Total sales $ 1,553.4 $ 1,710.3 Income (loss) before taxes: Chlor Alkali Products and Vinyls $ 120.4 $ 130.5 Epoxy 10.5 (22.1 ) Winchester 9.1 12.0 Corporate/other: Environmental expense (1.8 ) (2.3 ) Other corporate and unallocated costs (39.1 ) (36.5 ) Restructuring charges (4.0 ) (4.0 ) Acquisition-related costs — (0.3 ) Other operating income 0.1 8.1 Interest expense (57.4 ) (63.7 ) Interest income 0.2 0.4 Non-operating pension income 3.9 5.4 Other income 11.2 — Income before taxes $ 53.1 $ 27.5 For the three months ended March 31, 2019 , other income included a gain of $11.2 million on the sale of our equity interest in a non-consolidated affiliate. For the three months ended March 31, 2018 , we recognized an insurance recovery of $8.0 million in other operating income for a second quarter 2017 business interruption at our Freeport, TX vinyl chloride monomer facility. Three Months Ended March 31, 2019 Chlor Alkali Products and Vinyls Epoxy Winchester Total Sales: ($ in millions) United States $ 604.0 $ 164.1 $ 141.3 $ 909.4 Europe 38.6 235.4 2.8 276.8 Other foreign 229.6 124.5 13.1 367.2 Total Sales $ 872.2 $ 524.0 $ 157.2 $ 1,553.4 Three Months Ended March 31, 2018 Chlor Alkali Products and Vinyls Epoxy Winchester Total Sales: ($ in millions) United States $ 608.1 $ 180.4 $ 158.6 $ 947.1 Europe 45.8 278.5 1.0 325.3 Other foreign 282.2 144.4 11.3 437.9 Total Sales $ 936.1 $ 603.3 $ 170.9 $ 1,710.3 Three Months Ended March 31, 2019 2018 Sales: ($ in millions) Chlor Alkali Products and Vinyls Caustic soda $ 462.1 $ 536.9 Chlorine, chlorine-derivatives and other co-products 410.1 399.2 Total Chlor Alkali Products and Vinyls 872.2 936.1 Epoxy Aromatics and allylics 243.8 308.4 Epoxy resins 280.2 294.9 Total Epoxy 524.0 603.3 Winchester Commercial 106.4 111.2 Military and law enforcement 50.8 59.7 Total Winchester 157.2 170.9 Total Sales $ 1,553.4 $ 1,710.3

STOCK-BASED COMPENSATION

STOCK-BASED COMPENSATION	3 Months Ended
	Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
STOCK-BASED COMPENSATION	NOTE 16 . STOCK-BASED COMPENSATION Stock-based compensation granted includes stock options, performance stock awards, restricted stock awards and deferred directors’ compensation. Stock-based compensation expense was as follows: Three Months Ended March 31, 2019 2018 ($ in millions) Stock-based compensation $ 5.6 $ 6.5 Mark-to-market adjustments 1.3 (3.2 ) Total expense $ 6.9 $ 3.3 The fair value of each stock option granted, which typically vests ratably over three years, but not less than one year, was estimated on the date of grant, using the Black-Scholes option-pricing model with the following weighted-average assumptions: Grant date 2019 2018 Dividend yield 3.05 % 2.43 % Risk-free interest rate 2.51 % 2.72 % Expected volatility 34 % 32 % Expected life (years) 6.0 6.0 Weighted-average grant fair value (per option) $ 6.76 $ 8.89 Weighted-average exercise price $ 26.26 $ 32.94 Shares granted 1,575,900 927,000 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 of future exercise patterns.

DEBT

DEBT	3 Months Ended
	Mar. 31, 2019
Debt Instruments [Abstract]
DEBT	NOTE 17 . DEBT On January 19, 2018, Olin issued $550.0 million aggregate principal amount of 5.00% senior notes due February 1, 2030 (2030 Notes), which were registered under the Securities Act of 1933, as amended. Interest on the 2030 Notes began accruing from January 19, 2018 and is paid semi-annually beginning on August 1, 2018. Proceeds from the 2030 Notes were used to redeem $550.0 million of debt under the $1,375.0 million term loan facility (Term Loan Facility). For the three months ended March 31, 2018 , we recognized interest expense of $2.6 million for the write-off of unamortized deferred debt issuance costs related to the redemption of $550.0 million of debt under the Term Loan Facility. For the three months ended March 31, 2018 , we paid debt issuance costs of $8.5 million for the issuance of the 2030 Notes.

CONTRIBUTING EMPLOYEE OWNERSHIP

CONTRIBUTING EMPLOYEE OWNERSHIP PLAN	3 Months Ended
	Mar. 31, 2019
Defined Contribution Plan [Abstract]
CONTRIBUTING EMPLOYEE OWNERSHIP PLAN	NOTE 18 . CONTRIBUTING EMPLOYEE OWNERSHIP PLAN The Contributing Employee Ownership Plan (CEOP) is a defined contribution plan available to essentially all domestic employees. We provide a contribution to an individual retirement contribution account maintained with the CEOP equal to an amount of between 5.0% and 7.5% of the employee’s eligible compensation. The defined contribution plan expense for the three months ended March 31, 2019 and 2018 was $9.4 million and $8.6 million , respectively. Company matching contributions are invested in the same investment allocation as the employee’s contribution. Our matching contributions for eligible employees for the three months ended March 31, 2019 and 2018 were $3.9 million and $3.7 million , respectively.

PENSION PLANS AND RETIREMENT BE

PENSION PLANS AND RETIREMENT BENEFITS	3 Months Ended
	Mar. 31, 2019
Retirement Benefits [Abstract]
PENSION PLANS AND RETIREMENT BENEFITS	NOTE 19 . PENSION PLANS AND RETIREMENT BENEFITS We sponsor domestic and foreign defined benefit pension plans for eligible employees and retirees. Most of our domestic employees participate in defined contribution plans. However, a portion of our bargaining hourly employees continue to participate in our domestic qualified defined benefit pension plans under a flat-benefit formula. Our funding policy for the qualified defined benefit pension plans is consistent with the requirements of federal laws and regulations. Our foreign subsidiaries maintain pension and other benefit plans, which are consistent with local statutory practices. Our domestic qualified defined benefit pension plan provides that if, within three years following a change of control of Olin, any corporate action is taken or filing made in contemplation of, among other things, a plan termination or merger or other transfer of assets or liabilities of the plan, and such termination, merger, or transfer thereafter takes place, plan benefits would automatically be increased for affected participants (and retired participants) to absorb any plan surplus (subject to applicable collective bargaining requirements). We also provide certain postretirement healthcare (medical) and life insurance benefits for eligible active and retired domestic employees. The healthcare plans are contributory with participants’ contributions adjusted annually based on medical rates of inflation and plan experience. Pension Benefits Other Postretirement Three Months Ended March 31, Three Months Ended March 31, 2019 2018 2019 2018 Components of Net Periodic Benefit (Income) Cost ($ in millions) Service cost $ 3.1 $ 2.7 $ 0.3 $ 0.3 Interest cost 23.6 21.6 0.4 0.4 Expected return on plans’ assets (35.3 ) (36.8 ) — — Recognized actuarial loss 6.8 8.8 0.6 0.6 Net periodic benefit (income) cost $ (1.8 ) $ (3.7 ) $ 1.3 $ 1.3 We made cash contributions to our international qualified defined benefit pension plans of $0.1 million and $0.5 million for the three months ended March 31, 2019 and 2018 , respectively.

INCOME TAXES

INCOME TAXES	3 Months Ended
	Mar. 31, 2019
Income Tax Disclosure [Abstract]
INCOME TAXES	NOTE 20 . INCOME TAXES The effective tax rate for the three months ended March 31, 2019 included a benefit associated with stock-based compensation, a benefit associated with prior year tax positions and a benefit from a net decrease in the valuation allowance related to state deferred tax assets. These factors resulted in a net $0.8 million tax benefit. After giving consideration to these items, the effective tax rate for the three months ended March 31, 2019 of 23.0% was higher than the 21% U.S. federal statutory rate, primarily due to state and foreign income taxes, foreign income inclusions and a net increase in the valuation allowance related to losses in foreign jurisdictions, partially offset by favorable permanent salt depletion deductions. The effective tax rate for the three months ended March 31, 2018 included a benefit associated with stock-based compensation, a benefit associated with the estimated reduction of the one-time 2017 Tax Act transition tax and a benefit related to a foreign dividend payment. These factors resulted in a net $0.8 million tax benefit. After giving consideration to these items, the effective tax rate for the three months ended March 31, 2018 of 26.9% was higher than the 21% U.S. federal statutory rate, primarily due to state and foreign income taxes, partially offset by favorable permanent salt depletion deductions. As of March 31, 2019 , we had $34.4 million of gross unrecognized tax benefits, which would have a net $33.5 million impact on the effective tax rate, if recognized. As of March 31, 2018 , we had $36.8 million of gross unrecognized tax benefits, of which $35.9 million would have impacted the effective tax rate, if recognized. The amount of unrecognized tax benefits was as follows: March 31, 2019 2018 ($ in millions) Balance at beginning of year $ 33.8 $ 36.3 Increases for current year tax positions 0.6 0.5 Balance at end of period $ 34.4 $ 36.8 As of March 31, 2019 , we believe it is reasonably possible that our total amount of unrecognized tax benefits will decrease by approximately $14.7 million over the next twelve months. The anticipated reduction primarily relates to settlements with taxing authorities and the expiration of federal, state and foreign statutes of limitation. We operate globally and file income tax returns in numerous jurisdictions. Our tax returns are subject to examination by various federal, state and local tax authorities. None of our U.S. federal income tax returns are currently under examination by the Internal Revenue Service. 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 2013 - 2018 U.S. state income tax 2006 - 2018 Canadian federal income tax 2012 - 2018 Brazil 2014 - 2018 Germany 2015 - 2018 China 2014 - 2018 The Netherlands 2014 - 2018

DERIVATIVE FINANCIAL INSTRUMENT

DERIVATIVE FINANCIAL INSTRUMENTS	3 Months Ended
	Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE FINANCIAL INSTRUMENTS	NOTE 21 . DERIVATIVE FINANCIAL INSTRUMENTS We are exposed to market risk in the normal course of our business operations due to our purchases of certain commodities, our ongoing investing and financing activities and our operations that use foreign currencies. The risk of loss can be assessed from the perspective of adverse changes in fair values, cash flows and future earnings. We have established policies and procedures governing our management of market risks and the use of financial instruments to manage exposure to such risks. ASC 815 “Derivatives and Hedging” (ASC 815) requires an entity to recognize all derivatives as either assets or liabilities in the condensed balance sheets and measure those instruments at fair value. In accordance with ASC 815, we designate derivative contracts as cash flow hedges of forecasted purchases of commodities and forecasted interest payments related to variable-rate borrowings and designate certain interest rate swaps as fair value hedges of fixed-rate borrowings. We do not enter into any derivative instruments for trading or speculative purposes. Energy costs, including electricity and natural gas, and certain raw materials used in our production processes are subject to price volatility. Depending on market conditions, we may enter into futures contracts, forward contracts, commodity swaps and put and call option contracts in order to reduce the impact of commodity price fluctuations. The majority of our commodity derivatives expire within one year. We actively manage currency exposures that are associated with net monetary asset positions, currency purchases and sales commitments denominated in foreign currencies and foreign currency denominated assets and liabilities created in the normal course of business. We enter into forward sales and purchase contracts to manage currency risk to offset our net exposures, by currency, related to the foreign currency denominated monetary assets and liabilities of our operations. At March 31, 2019 , we had outstanding forward contracts to buy foreign currency with a notional value of $110.5 million and to sell foreign currency with a notional value of $89.7 million . All of the currency derivatives expire within one year and are for U.S. dollar (USD) equivalents. The counterparties to the forward contracts are large financial institutions; however, the risk of loss to us in the event of nonperformance by a counterparty could be significant to our financial position or results of operations. At December 31, 2018 , we had outstanding forward contracts to buy foreign currency with a notional value of $123.7 million and to sell foreign currency with a notional value of $82.6 million . At March 31, 2018 , we had outstanding forward contracts to buy foreign currency with a notional value of $98.0 million and to sell foreign currency with a notional value of $132.3 million . Cash Flow Hedges For derivative instruments that are designated and qualify as a cash flow hedge, the change in fair value of the derivative is recognized as a component of other comprehensive income (loss) until the hedged item is recognized in earnings. We had the following notional amounts of outstanding commodity contracts that were entered into to hedge forecasted purchases: March 31, 2019 December 31, 2018 March 31, 2018 ($ in millions) Natural gas $ 75.7 $ 58.4 $ 68.9 Other commodities 92.9 58.1 59.5 Total notional $ 168.6 $ 116.5 $ 128.4 As of March 31, 2019 , the counterparties to these commodity contracts were Wells Fargo Bank, N.A. (Wells Fargo), Citibank, JPMorgan Chase Bank, National Association and The Bank of Nova Scotia, 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 March 31, 2019 , we had open derivative contract positions through 2022. If all open futures contracts had been settled on March 31, 2019 , we would have recognized a pretax loss of $5.4 million . If commodity prices were to remain at March 31, 2019 levels, approximately $4.6 million of deferred losses, net of tax, would be reclassified into earnings during the next twelve months. The actual effect on earnings will be dependent on actual commodity prices when the forecasted transactions occur. We use interest rate swaps as a means of minimizing cash flow fluctuations that may arise from volatility in interest rates of our variable-rate borrowings. In April 2016, we entered into three tranches of forward starting interest rate swaps whereby we agreed to pay fixed rates to the counterparties who, in turn, pay us floating rates on $1,100.0 million , $900.0 million , and $400.0 million of our underlying floating-rate debt obligations. Each tranche’s term length is for twelve months beginning on December 31, 2016, December 31, 2017 and December 31, 2018, respectively. The counterparties to the agreements are SMBC Capital Markets, Inc., Wells Fargo, PNC Bank, National Association and Toronto-Dominion Bank. These counterparties are large financial institutions; however, the risk of loss to us in the event of nonperformance by a counterparty could be significant to our financial position or results of operations. We have designated the swaps as cash flow hedges of the risk of changes in interest payments associated with our variable-rate borrowings. Accordingly, the remaining swap agreement has been recorded at its fair market value of $3.6 million and is included in other current assets on the accompanying condensed balance sheet as of March 31, 2019 , with the corresponding gain deferred as a component of other comprehensive loss. For both the three months ended March 31, 2019 and 2018 , $1.3 million of income was recorded to interest expense on the accompanying condensed statements of operations related to these swap agreements. At March 31, 2019 , we had open interest rate swaps designated as cash flow hedges with maximum terms through 2019. If all open interest rate swap contracts had been settled on March 31, 2019 , we would have recognized a pretax gain of $3.6 million . If interest rates were to remain at March 31, 2019 levels, $2.8 million of deferred gains, net of tax, would be reclassified into earnings during the next twelve months. The actual effect on earnings will be dependent on actual interest rates 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. As of March 31, 2019 , December 31, 2018 and March 31, 2018 , the total notional amounts of our interest rate swaps designated as fair value hedges were $500.0 million . In April 2016, we entered into interest rate swaps on $250.0 million of our underlying fixed-rate debt obligations, whereby we agreed to pay variable rates to the counterparties who, in turn, pay us fixed rates. The counterparties to these agreements are Toronto-Dominion Bank and SMBC Capital Markets, Inc., both of which are major financial institutions. In October 2016, we entered into interest rate swaps on an additional $250.0 million of our underlying fixed-rate debt obligations, whereby we agreed to pay variable rates to the counterparties who, in turn, pay us fixed rates. The counterparties to these agreements are PNC Bank, National Association and Wells Fargo, both of which are major financial institutions. We have designated the April 2016 and October 2016 interest rate swap agreements as fair value hedges of the risk of changes in the value of fixed-rate debt due to changes in interest rates for a portion of our fixed-rate borrowings. Accordingly, the swap agreements have been recorded at their fair market value of $23.5 million and are included in other long-term liabilities on the accompanying condensed balance sheet as of March 31, 2019 , with a corresponding decrease in the carrying amount of the related debt. For the three months ended March 31, 2019 and 2018 , $0.7 million of expense and $0.2 million of income, respectively, was recorded to interest expense on the accompanying condensed statements of operations related to these swap agreements. Financial Statement Impacts We present our derivative assets and liabilities in our condensed balance sheets on a net basis whenever we have a legally enforceable master netting agreement with the counterparty to our derivative contracts. We use these agreements to manage and substantially reduce our potential counterparty credit risk. The following table summarizes the location and fair value of the derivative instruments on our condensed balance sheets. The table disaggregates our net derivative assets and liabilities into gross components on a contract-by-contract basis before giving effect to master netting arrangements: March 31, 2019 December 31, 2018 March 31, 2018 ($ in millions) Asset Derivatives: Other current assets Derivatives designated as hedging instruments: Interest rate contracts - gains $ 3.6 $ 5.3 $ 8.5 Commodity contracts - gains 3.2 — 7.2 Commodity contracts - losses (0.6 ) — (1.2 ) Derivatives not designated as hedging instruments: Foreign exchange contracts - gains 0.6 0.9 1.1 Foreign exchange contracts - losses (0.3 ) (0.5 ) (0.6 ) Total other current assets 6.5 5.7 15.0 Other assets Derivatives designated as hedging instruments: Interest rate contracts - gains — — 3.7 Commodity contracts - gains 2.2 0.9 0.4 Commodity contracts - losses (0.1 ) (0.2 ) (0.1 ) Total other assets 2.1 0.7 4.0 Total Asset Derivatives (1) $ 8.6 $ 6.4 $ 19.0 Liability Derivatives: Accrued liabilities Derivatives designated as hedging instruments: Commodity contracts - losses $ 9.8 $ 4.9 $ 1.0 Commodity contracts - gains (0.6 ) (1.9 ) (0.2 ) Derivatives not designated as hedging instruments: Foreign exchange contracts - losses 0.2 0.6 — Foreign exchange contracts - gains — (0.1 ) — Total accrued liabilities 9.4 3.5 0.8 Other liabilities Derivatives designated as hedging instruments: Interest rate contracts - losses 23.5 33.7 40.3 Commodity contracts - losses 0.9 0.5 — Commodity contracts - gains — (0.1 ) — Total other liabilities 24.4 34.1 40.3 Total Liability Derivatives (1) $ 33.8 $ 37.6 $ 41.1 (1) Does not include the impact of cash collateral received from or provided to counterparties. The following table summarizes the effects of derivative instruments on our condensed statements of operations: Amount of (Loss) Gain Three Months Ended March 31, Location of (Loss) Gain 2019 2018 Derivatives – Cash Flow Hedges ($ in millions) Recognized in other comprehensive income: Commodity contracts ——— $ (6.2 ) $ (1.0 ) Interest rate contracts ——— (0.4 ) 3.1 $ (6.6 ) $ 2.1 Reclassified from accumulated other comprehensive loss into income: Interest rate contracts Interest expense $ 1.3 $ 1.3 Commodity contracts Cost of goods sold (3.5 ) 1.0 $ (2.2 ) $ 2.3 Derivatives – Fair Value Hedges Interest rate contracts Interest expense $ (0.7 ) $ 0.2 Derivatives Not Designated as Hedging Instruments Foreign exchange contracts Selling and administration $ (2.4 ) $ 0.5 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 March 31, 2019 , December 31, 2018 and March 31, 2018 , this threshold was not exceeded. In all instances where we are party to a master netting agreement, we offset the receivable or payable recognized upon payment of cash collateral against the fair value amounts recognized for derivative instruments that have also been offset under such master netting agreements.

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS	3 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	NOTE 22 . FAIR VALUE MEASUREMENTS Fair value is defined as the price at which an asset could be exchanged in a current transaction between knowledgeable, willing parties or the amount that would be paid to transfer a liability to a new obligor, not the amount that would be paid to settle the liability with the creditor. Where available, fair value is based on observable market prices or parameters or derived from such prices or parameters. Where observable prices or inputs are not available, valuation models are applied. These valuation techniques involve some level of management estimation and judgment, the degree of which is dependent on the price transparency for the instruments or market and the instruments’ complexity. Assets and liabilities recorded at fair value in the condensed balance sheets are categorized based upon the level of judgment associated with the inputs used to measure their fair value. Hierarchical levels, defined by ASC 820 “Fair Value Measurements and Disclosures” (ASC 820) are directly related to the amount of subjectivity associated with the inputs to fair valuation of these assets and liabilities, and are as follows: Level 1 — Inputs were unadjusted, quoted prices in active markets for identical assets or liabilities at the measurement date. Level 2 — Inputs (other than quoted prices included in Level 1) were either directly or indirectly observable for the asset or liability through correlation with market data at the measurement date and for the duration of the instrument’s anticipated life. Level 3 — Inputs reflected management’s best estimate of what market participants would use in pricing the asset or liability at the measurement date. Consideration was given to the risk inherent in the valuation technique and the risk inherent in the inputs to the model. We are required to separately disclose assets and liabilities measured at fair value on a recurring basis, from those measured at fair value on a nonrecurring basis. Nonfinancial assets measured at fair value on a nonrecurring basis are intangible assets and goodwill, which are reviewed for impairment annually in the fourth quarter and/or when circumstances or other events indicate that impairment may have occurred. Determining which hierarchical level an asset or liability falls within requires significant judgment. We evaluate our hierarchy disclosures each quarter. The following table summarizes the assets and liabilities measured at fair value in the condensed balance sheets: Fair Value Measurements Balance at March 31, 2019 Level 1 Level 2 Level 3 Total Assets ($ in millions) Interest rate swaps $ — $ 3.6 $ — $ 3.6 Commodity contracts — 4.7 — 4.7 Foreign exchange contracts — 0.3 — 0.3 Total Assets $ — $ 8.6 $ — $ 8.6 Liabilities Interest rate swaps $ — $ 23.5 $ — $ 23.5 Commodity contracts — 10.1 — 10.1 Foreign exchange contracts — 0.2 — 0.2 Total Liabilities $ — $ 33.8 $ — $ 33.8 Balance at December 31, 2018 Assets Interest rate swaps $ — $ 5.3 $ — $ 5.3 Commodity contracts — 0.7 — 0.7 Foreign exchange contracts — 0.4 — 0.4 Total Assets $ — $ 6.4 $ — $ 6.4 Liabilities Interest rate swaps $ — $ 33.7 $ — $ 33.7 Commodity contracts — 3.4 — 3.4 Foreign exchange contracts — 0.5 — 0.5 Total Liabilities $ — $ 37.6 $ — $ 37.6 Balance at March 31, 2018 Assets Interest rate swaps $ — $ 12.2 $ — $ 12.2 Commodity contracts — 6.3 — 6.3 Foreign exchange contracts — 0.5 — 0.5 Total Assets $ — $ 19.0 $ — $ 19.0 Liabilities Interest rate swaps $ — $ 40.3 $ — $ 40.3 Commodity contracts — 0.8 — 0.8 Total Liabilities $ — $ 41.1 $ — $ 41.1 Interest Rate Swaps Interest rate swap financial instruments were valued using the “income approach” valuation technique. This method used valuation techniques to convert future amounts to a single present amount. The measurement was based on the value indicated by current market expectations about those future amounts. We use interest rate swaps as a means of managing interest expense and floating interest rate exposure to optimal levels. Commodity Forward Contracts Commodity contract financial instruments were valued primarily based on prices and other relevant information observable in market transactions involving identical or comparable assets or liabilities including both forward and spot prices for commodities. We use commodity derivative contracts for certain raw materials and energy costs such as copper, zinc, lead, electricity and natural gas to provide a measure of stability in managing our exposure to price fluctuations. Foreign Currency Contracts Foreign currency contract financial instruments were valued primarily based on relevant information observable in market transactions involving identical or comparable assets or liabilities including both forward and spot prices for currencies. We enter into forward sales and purchase contracts to manage currency risk resulting from purchase and sale commitments denominated in foreign currencies. Financial Instruments The carrying values of cash and cash equivalents, accounts receivable and accounts payable approximated fair values due to the short-term maturities of these instruments. The fair value of our long-term debt was determined based on current market rates for debt of similar risk and maturities. The following table summarizes the fair value measurements of debt and the actual debt recorded on our condensed balance sheets: Fair Value Measurements Amount recorded Level 1 Level 2 Level 3 Total ($ in millions) Balance at March 31, 2019 $ — $ 3,221.9 $ 153.0 $ 3,374.9 $ 3,193.3 Balance at December 31, 2018 — 3,137.2 153.0 3,290.2 3,230.3 Balance at March 31, 2018 — 3,583.9 153.0 3,736.9 3,535.4 Nonrecurring Fair Value Measurements In addition to assets and liabilities that are recorded at fair value on a recurring basis, we record assets and liabilities at fair value on a nonrecurring basis as required by ASC 820. There were no assets measured at fair value on a nonrecurring basis as of March 31, 2019 , December 31, 2018 and March 31, 2018 .

SUPPLEMENTAL GUARANTOR FINANCIA

SUPPLEMENTAL GUARANTOR FINANCIAL INFORMATION	3 Months Ended
	Mar. 31, 2019
Supplemental Guarantor Financial Information [Abstract]
SUPPLEMENTAL GUARANTOR FINANCIAL INFORMATION	NOTE 23 . SUPPLEMENTAL GUARANTOR FINANCIAL INFORMATION In October 2015, Blue Cube Spinco LLC (the Issuer) issued $720.0 million aggregate principal amount of 9.75% senior notes due October 15, 2023 (2023 Notes) and $500.0 million aggregate principal amount of 10.00% senior notes due October 15, 2025 (2025 Notes and, together with the 2023 Notes, the Notes). During 2016, the Notes were registered under the Securities Act of 1933, as amended. The Issuer was formed on March 13, 2015 as a wholly owned subsidiary of Dow and upon closing of the Acquisition became a 100% owned subsidiary of Olin (the Parent Guarantor). The Notes are fully and unconditionally guaranteed by the Parent Guarantor. The following condensed consolidating financial information presents the condensed consolidating balance sheets as of March 31, 2019 , December 31, 2018 and March 31, 2018 , the related condensed consolidating statements of operations, comprehensive income (loss) and cash flows for each of the three months ended March 31, 2019 and 2018 , of (a) the Parent Guarantor, (b) the Issuer, (c) the non-guarantor subsidiaries, (d) elimination entries necessary to consolidate the Parent Guarantor with the Issuer and the non-guarantor subsidiaries and (e) Olin on a consolidated basis. Investments in consolidated subsidiaries are presented under the equity method of accounting. CONDENSED CONSOLIDATING BALANCE SHEETS March 31, 2019 (In millions) (Unaudited) Parent Guarantor Issuer Subsidiary Eliminations Total Assets Current assets: Cash and cash equivalents $ 6.0 $ — $ 99.7 $ — $ 105.7 Receivables, net 99.0 — 709.3 — 808.3 Intercompany receivables — — 2,664.7 (2,664.7 ) — Income taxes receivable 0.3 — 6.0 — 6.3 Inventories, net 172.3 — 545.2 — 717.5 Other current assets 235.7 — 3.5 (192.5 ) 46.7 Total current assets 513.3 — 4,028.4 (2,857.2 ) 1,684.5 Property, plant and equipment, net 674.0 — 2,759.5 — 3,433.5 Operating lease assets, net 48.9 — 226.2 — 275.1 Investment in subsidiaries 7,024.5 4,339.5 — (11,364.0 ) — Deferred income taxes 3.2 — 31.9 (3.4 ) 31.7 Other assets 17.0 — 1,114.4 — 1,131.4 Long-term receivables—affiliates — 1,169.9 — (1,169.9 ) — Intangible assets, net 0.3 — 493.9 — 494.2 Goodwill — 966.3 1,153.2 — 2,119.5 Total assets $ 8,281.2 $ 6,475.7 $ 9,807.5 $ (15,394.5 ) $ 9,169.9 Liabilities and Shareholders’ Equity Current liabilities: Current installments of long-term debt $ 1.1 $ — $ 125.0 $ — $ 126.1 Accounts payable 75.8 — 566.8 (5.6 ) 637.0 Intercompany payables 2,664.7 — — (2,664.7 ) — Income taxes payable 3.7 — 9.3 — 13.0 Current operating lease liabilities 8.0 — 61.4 — 69.4 Accrued liabilities 138.3 — 345.9 (189.8 ) 294.4 Total current liabilities 2,891.6 — 1,108.4 (2,860.1 ) 1,139.9 Long-term debt 1,370.3 1,696.9 — — 3,067.2 Operating lease liabilities 42.0 — 164.0 — 206.0 Accrued pension liability 427.0 — 233.2 — 660.2 Deferred income taxes — 6.1 523.2 (3.4 ) 525.9 Long-term payables—affiliates 419.6 — 750.3 (1,169.9 ) — Other liabilities 293.1 5.5 434.5 — 733.1 Total liabilities 5,443.6 1,708.5 3,213.6 (4,033.4 ) 6,332.3 Commitments and contingencies Shareholders’ equity: Common stock 164.9 — 14.6 (14.6 ) 164.9 Additional paid-in capital 2,239.2 4,125.7 4,808.2 (8,933.9 ) 2,239.2 Accumulated other comprehensive loss (656.9 ) — (8.1 ) 8.1 (656.9 ) Retained earnings 1,090.4 641.5 1,779.2 (2,420.7 ) 1,090.4 Total shareholders’ equity 2,837.6 4,767.2 6,593.9 (11,361.1 ) 2,837.6 Total liabilities and shareholders’ equity $ 8,281.2 $ 6,475.7 $ 9,807.5 $ (15,394.5 ) $ 9,169.9 CONDENSED CONSOLIDATING BALANCE SHEETS December 31, 2018 (In millions) (Unaudited) Parent Guarantor Issuer Subsidiary Eliminations Total Assets Current assets: Cash and cash equivalents $ 92.0 $ — $ 86.8 $ — $ 178.8 Receivables, net 99.7 — 676.6 — 776.3 Intercompany receivables — — 2,558.2 (2,558.2 ) — Income taxes receivable 2.6 — 3.3 — 5.9 Inventories, net 161.4 — 550.0 — 711.4 Other current assets 220.2 — 1.8 (187.0 ) 35.0 Total current assets 575.9 — 3,876.7 (2,745.2 ) 1,707.4 Property, plant and equipment, net 651.4 — 2,830.7 — 3,482.1 Investment in subsidiaries 6,943.3 4,286.9 — (11,230.2 ) — Deferred income taxes 7.3 — 27.4 (8.4 ) 26.3 Other assets 24.3 — 1,126.1 — 1,150.4 Long-term receivables—affiliates — 1,247.2 — (1,247.2 ) — Intangible assets, net 0.3 — 511.3 — 511.6 Goodwill — 966.3 1,153.3 — 2,119.6 Total assets $ 8,202.5 $ 6,500.4 $ 9,525.5 $ (15,231.0 ) $ 8,997.4 Liabilities and Shareholders’ Equity Current liabilities: Current installments of long-term debt $ 0.9 $ — $ 125.0 $ — $ 125.9 Accounts payable 90.1 — 549.4 (3.0 ) 636.5 Intercompany payables 2,558.2 — — (2,558.2 ) — Income taxes payable 3.9 — 18.7 — 22.6 Accrued liabilities 150.3 — 367.5 (184.5 ) 333.3 Total current liabilities 2,803.4 — 1,060.6 (2,745.7 ) 1,118.3 Long-term debt 1,357.5 1,746.9 — — 3,104.4 Accrued pension liability 439.1 — 235.2 — 674.3 Deferred income taxes — 6.0 521.3 (8.4 ) 518.9 Long-term payables—affiliates 469.6 — 777.6 (1,247.2 ) — Other liabilities 300.7 5.5 443.1 — 749.3 Total liabilities 5,370.3 1,758.4 3,037.8 (4,001.3 ) 6,165.2 Commitments and contingencies Shareholders’ equity: Common stock 165.3 — 14.6 (14.6 ) 165.3 Additional paid-in capital 2,247.4 4,125.7 4,808.2 (8,933.9 ) 2,247.4 Accumulated other comprehensive loss (651.0 ) — (6.9 ) 6.9 (651.0 ) Retained earnings 1,070.5 616.3 1,671.8 (2,288.1 ) 1,070.5 Total shareholders’ equity 2,832.2 4,742.0 6,487.7 (11,229.7 ) 2,832.2 Total liabilities and shareholders’ equity $ 8,202.5 $ 6,500.4 $ 9,525.5 $ (15,231.0 ) $ 8,997.4 CONDENSED CONSOLIDATING BALANCE SHEETS March 31, 2018 (In millions) (Unaudited) Parent Guarantor Issuer Subsidiary Eliminations Total Assets Current assets: Cash and cash equivalents $ 3.6 $ — $ 105.5 $ — $ 109.1 Receivables, net 119.6 — 716.0 — 835.6 Intercompany receivables — — 2,191.7 (2,191.7 ) — Income taxes receivable 11.4 — 6.1 — 17.5 Inventories, net 160.2 — 515.4 — 675.6 Other current assets 223.7 — 7.3 (169.8 ) 61.2 Total current assets 518.5 — 3,542.0 (2,361.5 ) 1,699.0 Property, plant and equipment, net 551.8 — 2,987.6 — 3,539.4 Investment in subsidiaries 6,720.1 4,114.5 — (10,834.6 ) — Deferred income taxes 43.7 — 42.5 (46.8 ) 39.4 Other assets 47.3 — 1,149.7 — 1,197.0 Long-term receivables—affiliates — 1,537.5 — (1,537.5 ) — Intangible assets, net 0.3 — 564.8 — 565.1 Goodwill — 966.3 1,154.0 — 2,120.3 Total assets $ 7,881.7 $ 6,618.3 $ 9,440.6 $ (14,780.4 ) $ 9,160.2 Liabilities and Shareholders’ Equity Current liabilities: Current installments of long-term debt $ 0.7 $ — $ — $ — $ 0.7 Accounts payable 62.0 — 639.7 (3.5 ) 698.2 Intercompany payables 2,191.7 — — (2,191.7 ) — Income taxes payable 2.3 — 13.7 — 16.0 Accrued liabilities 115.0 — 308.7 (167.6 ) 256.1 Total current liabilities 2,371.7 — 962.1 (2,362.8 ) 971.0 Long-term debt 1,352.2 1,952.2 230.3 — 3,534.7 Accrued pension liability 391.4 — 237.3 — 628.7 Deferred income taxes — 4.1 541.1 (46.8 ) 498.4 Long-term payables—affiliates 680.0 — 857.5 (1,537.5 ) — Other liabilities 323.3 5.6 435.4 — 764.3 Total liabilities 5,118.6 1,961.9 3,263.7 (3,947.1 ) 6,397.1 Commitments and contingencies Shareholders’ equity: Common stock 167.2 — 14.6 (14.6 ) 167.2 Additional paid-in capital 2,285.0 4,125.7 4,808.2 (8,933.9 ) 2,285.0 Accumulated other comprehensive loss (552.8 ) — (4.8 ) 4.8 (552.8 ) Retained earnings 863.7 530.7 1,358.9 (1,889.6 ) 863.7 Total shareholders’ equity 2,763.1 4,656.4 6,176.9 (10,833.3 ) 2,763.1 Total liabilities and shareholders’ equity $ 7,881.7 $ 6,618.3 $ 9,440.6 $ (14,780.4 ) $ 9,160.2 CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS Three Months Ended March 31, 2019 (In millions) (Unaudited) Parent Guarantor Issuer Subsidiary Eliminations Total Sales $ 332.8 $ — $ 1,327.7 $ (107.1 ) $ 1,553.4 Operating expenses: Cost of goods sold 304.1 — 1,150.3 (107.1 ) 1,347.3 Selling and administration 51.8 — 55.2 — 107.0 Restructuring charges 1.4 — 2.6 — 4.0 Acquisition-related costs — — — — — Other operating (loss) income (2.1 ) — 2.2 — 0.1 Operating (loss) income (26.6 ) — 121.8 — 95.2 Equity income in subsidiaries 62.6 52.6 — (115.2 ) — Interest expense 17.4 36.1 5.2 (1.3 ) 57.4 Interest income 0.6 — 0.9 (1.3 ) 0.2 Non-operating pension income (expense) 5.4 — (1.5 ) — 3.9 Other income 11.2 — — — 11.2 Income before taxes 35.8 16.5 116.0 (115.2 ) 53.1 Income tax (benefit) provision (5.9 ) (8.7 ) 26.0 — 11.4 Net income $ 41.7 $ 25.2 $ 90.0 $ (115.2 ) $ 41.7 CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS Three Months Ended March 31, 2018 (In millions) (Unaudited) Parent Guarantor Issuer Subsidiary Eliminations Total Sales $ 352.7 $ — $ 1,467.0 $ (109.4 ) $ 1,710.3 Operating expenses: Cost of goods sold 312.0 — 1,326.1 (109.4 ) 1,528.7 Selling and administration 47.1 — 53.4 — 100.5 Restructuring charges — — 4.0 — 4.0 Acquisition-related costs 0.3 — — — 0.3 Other operating income 5.8 — 2.3 — 8.1 Operating (loss) income (0.9 ) — 85.8 — 84.9 Earnings of non-consolidated affiliates 0.5 — — — 0.5 Equity income in subsidiaries 28.4 22.2 — (50.6 ) — Interest expense 17.0 41.3 6.9 (1.5 ) 63.7 Interest income 1.0 — 0.9 (1.5 ) 0.4 Non-operating pension income (expense) 6.7 — (1.3 ) — 5.4 Income (loss) before taxes 18.7 (19.1 ) 78.5 (50.6 ) 27.5 Income tax (benefit) provision (2.2 ) (9.9 ) 18.7 — 6.6 Net income (loss) $ 20.9 $ (9.2 ) $ 59.8 $ (50.6 ) $ 20.9 CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME (LOSS) Three Months Ended March 31, 2019 (In millions) (Unaudited) Parent Guarantor Issuer Subsidiary Eliminations Total Net income $ 41.7 $ 25.2 $ 90.0 $ (115.2 ) $ 41.7 Other comprehensive income (loss), net of tax: Foreign currency translation adjustments, net — — (8.3 ) — (8.3 ) Unrealized losses on derivative contracts, net (3.3 ) — — — (3.3 ) Amortization of prior service costs and actuarial losses, net 5.1 — 0.6 — 5.7 Total other comprehensive income (loss), net of tax 1.8 — (7.7 ) — (5.9 ) Comprehensive income $ 43.5 $ 25.2 $ 82.3 $ (115.2 ) $ 35.8 CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME (LOSS) Three Months Ended March 31, 2018 (In millions) (Unaudited) Parent Guarantor Issuer Subsidiary Eliminations Total Net income (loss) $ 20.9 $ (9.2 ) $ 59.8 $ (50.6 ) $ 20.9 Other comprehensive income, net of tax: Foreign currency translation adjustments, net — — 12.4 — 12.4 Unrealized losses on derivative contracts, net (0.1 ) — — — (0.1 ) Amortization of prior service costs and actuarial losses, net 5.4 — — — 5.4 Total other comprehensive income, net of tax 5.3 — 12.4 — 17.7 Comprehensive income (loss) $ 26.2 $ (9.2 ) $ 72.2 $ (50.6 ) $ 38.6 CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS Three Months Ended March 31, 2019 (In millions) (Unaudited) Parent Guarantor Issuer Subsidiary Eliminations Total Net operating activities $ 39.7 $ — $ 64.6 $ — $ 104.3 Investing Activities Capital expenditures (50.7 ) — (51.5 ) — (102.2 ) Proceeds from disposition of non-consolidated affiliate 20.0 — — — 20.0 Net investing activities (30.7 ) — (51.5 ) — (82.2 ) Financing Activities Long-term debt repayments (0.2 ) (50.0 ) — — (50.2 ) Common stock repurchased and retired (13.2 ) — — — (13.2 ) Stock options exercised 1.4 — — — 1.4 Dividends paid (33.0 ) — — — (33.0 ) Intercompany financing activities (50.0 ) 50.0 — — — Net financing activities (95.0 ) — — — (95.0 ) Effect of exchange rate changes on cash and cash equivalents — — (0.2 ) — (0.2 ) Net (decrease) increase in cash and cash equivalents (86.0 ) — 12.9 — (73.1 ) Cash and cash equivalents, beginning of period 92.0 — 86.8 — 178.8 Cash and cash equivalents, end of period $ 6.0 $ — $ 99.7 $ — $ 105.7 CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS Three Months Ended March 31, 2018 (In millions) (Unaudited) Parent Guarantor Issuer Subsidiary Eliminations Total Net operating activities $ 69.3 $ — $ 11.6 $ — $ 80.9 Investing Activities Capital expenditures (41.7 ) — (47.8 ) — (89.5 ) Proceeds from disposition of property, plant and equipment — — 0.1 — 0.1 Net investing activities (41.7 ) — (47.7 ) — (89.4 ) Financing Activities Long-term debt: Borrowings 550.0 — 0.3 — 550.3 Repayments (20.2 ) (570.0 ) (19.7 ) — (609.9 ) Stock options exercised 1.0 — — — 1.0 Dividends paid (33.4 ) — — — (33.4 ) Debt issuance costs (8.5 ) — — — (8.5 ) Intercompany financing activities (570.0 ) 570.0 — — — Net financing activities (81.1 ) — (19.4 ) — (100.5 ) Effect of exchange rate changes on cash and cash equivalents — — (0.3 ) — (0.3 ) Net decrease in cash and cash equivalents (53.5 ) — (55.8 ) — (109.3 ) Cash and cash equivalents, beginning of period 57.1 — 161.3 — 218.4 Cash and cash equivalents, end of period $ 3.6 $ — $ 105.5 $ — $ 109.1

ACCOUNTING POLICIES (Policies)

ACCOUNTING POLICIES (Policies)	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Leases	Leases In February 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2016-02 “Leases,” (ASU 2016-02) which supersedes Accounting Standards Codification (ASC) 840 “Leases” and creates a new topic, ASC 842 “Leases” (ASC 842). Subsequent to the issuance of ASU 2016-02, ASC 842 was amended by various updates that amend and clarify the impact and implementation of the aforementioned update. Upon initial application, the provisions of these updates are required to be applied using the modified retrospective method which requires retrospective adoption to each prior reporting period presented with the cumulative effect of adoption recorded to the earliest reporting period presented. An optional transition method can be utilized which requires application of these updates beginning on the date of adoption with the cumulative effect of initially applying these updates recognized at the date of initial adoption. We adopted these updates on January 1, 2019 using the optional transition method. Consequently, our comparative periods have not been retrospectively adjusted for the new lease requirements. In addition, we elected the following practical expedients: – We elected the package of practical expedients permitted under the transition guidance within the new standard, which among other things, allowed us to carry forward the historical lease classification. – We elected the practical expedient related to land easements, allowing us to carry forward our accounting treatment for land easements on existing agreements. – We elected the short-term practical expedient for all classes of lease assets, which allows us to not record leases with an initial term of 12 months or less on the balance sheet, and instead recognize the expense straight-line over the lease term. – We elected the practical expedient to not separate lease components from non-lease components for all asset classes. Adoption of these updates resulted in the recording of operating lease assets and lease liabilities on our condensed balance sheet of $291.9 million as of January 1, 2019. Our assets and liabilities for finance leases remained unchanged. We also recognized the cumulative effect of applying these updates as an adjustment to retained earnings of $11.2 million , net of tax, which was primarily related to the recognition of previously deferred sale/leaseback gains. Our condensed statements of operations and cash flows, along with our compliance with all covenants and restrictions under all our outstanding credit agreements, were not impacted by this adoption. 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.

RESTRUCTURING CHARGES (Tables)

RESTRUCTURING CHARGES (Tables)	3 Months Ended
	Mar. 31, 2019
Restructuring and Related Activities [Abstract]
Schedule of Restructuring Reserve by Type of Cost	The following table summarizes the 2019 and 2018 activities by major component of these restructuring actions and the remaining balances of accrued restructuring costs as of March 31, 2019 and 2018 : Employee severance and related benefit costs Lease and other contract termination costs Facility exit costs Total ($ in millions) Balance at January 1, 2018 $ 1.8 $ 3.3 $ — $ 5.1 Restructuring charges — 0.4 3.6 4.0 Amounts utilized (0.5 ) (0.8 ) (1.5 ) (2.8 ) Balance at March 31, 2018 $ 1.3 $ 2.9 $ 2.1 $ 6.3 Balance at January 1, 2019 $ 1.5 $ 6.0 $ 0.7 $ 8.2 Restructuring charges 1.4 0.1 2.5 4.0 Amounts utilized (0.7 ) (0.6 ) (2.4 ) (3.7 ) Balance at March 31, 2019 $ 2.2 $ 5.5 $ 0.8 $ 8.5
Cumulative Restructuring Charges by Type and Plan	The following table summarizes the cumulative restructuring charges of these 2018, 2016 and 2014 restructuring actions by major component through March 31, 2019 : Chlor Alkali Products and Vinyls Winchester Total Becancour Capacity Reductions ($ in millions) Write-off of equipment and facility $ 3.5 $ 78.1 $ 2.6 $ 84.2 Employee severance and related benefit costs 2.7 5.9 2.7 11.3 Facility exit costs 5.9 36.3 — 42.2 Employee relocation costs — 1.7 — 1.7 Lease and other contract termination costs 6.1 40.2 0.3 46.6 Total cumulative restructuring charges $ 18.2 $ 162.2 $ 5.6 $ 186.0

ACCOUNTS RECEIVABLE (Tables)

ACCOUNTS RECEIVABLE (Tables)	3 Months Ended
	Mar. 31, 2019
Receivables [Abstract]
AR Facilities [Table Text Block]	The following table summarizes the AR Facilities activity: March 31, 2019 2018 ($ in millions) Balance at beginning of year $ 132.4 $ 182.3 Gross receivables sold 134.9 413.1 Payments received from customers on sold accounts (170.5 ) (416.5 ) Balance at end of period $ 96.8 $ 178.9

ALLOWANCE FOR DOUBTFUL ACCOUN_2

ALLOWANCE FOR DOUBTFUL ACCOUNTS RECEIVABLES (Tables)	3 Months Ended
	Mar. 31, 2019
Accounts Receivable, Net [Abstract]
Allowance for Doubtful Accounts Receivable	Allowance for doubtful accounts receivable consisted of the following: March 31, 2019 2018 ($ in millions) Balance at beginning of year $ 12.9 $ 12.3 Provisions charged 0.5 1.1 Write-offs, net of recoveries (0.1 ) — Foreign currency translation adjustment (0.1 ) — Balance at end of period $ 13.2 $ 13.4

INVENTORIES (Tables)

INVENTORIES (Tables)	3 Months Ended
	Mar. 31, 2019
Inventory Disclosure [Abstract]
Inventories Table	Inventories consisted of the following: March 31, 2019 December 31, March 31, 2018 ($ in millions) Supplies $ 70.3 $ 66.4 $ 65.7 Raw materials 73.5 66.7 75.3 Work in process 145.6 139.6 139.8 Finished goods 498.7 488.5 440.8 788.1 761.2 721.6 LIFO reserve (70.6 ) (49.8 ) (46.0 ) Inventories, net $ 717.5 $ 711.4 $ 675.6

OTHER ASSETS (Tables)

OTHER ASSETS (Tables)	3 Months Ended
	Mar. 31, 2019
Other Assets [Abstract]
Schedule of Other Assets	Included in other assets were the following: March 31, 2019 December 31, 2018 March 31, 2018 ($ in millions) Supply contracts $ 1,090.1 $ 1,099.5 $ 1,127.7 Investments in non-consolidated affiliates — 8.8 29.0 Other 41.3 42.1 40.3 Other assets $ 1,131.4 $ 1,150.4 $ 1,197.0

GOODWILL AND INTANGIBLES (Table

GOODWILL AND INTANGIBLES (Tables)	3 Months Ended
	Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	Changes in the carrying value of goodwill were as follows: Chlor Alkali Products and Vinyls Epoxy Total ($ in millions) Balance at January 1, 2018 $ 1,832.9 $ 287.1 $ 2,120.0 Foreign currency translation adjustment 0.2 0.1 0.3 Balance at March 31, 2018 $ 1,833.1 $ 287.2 $ 2,120.3 Balance at January 1, 2019 $ 1,832.6 $ 287.0 2,119.6 Foreign currency translation adjustment (0.1 ) — (0.1 ) Balance at March 31, 2019 $ 1,832.5 $ 287.0 $ 2,119.5
Schedule of Finite-Lived Intangible Assets	Intangible assets consisted of the following: March 31, 2019 December 31, 2018 March 31, 2018 Gross Amount Accumulated Amortization Net Gross Amount Accumulated Amortization Net Gross Amount Accumulated Amortization Net ($ in millions) Customers, customer contracts and relationships $ 673.3 $ (223.9 ) $ 449.4 $ 675.2 $ (211.9 ) $ 463.3 $ 682.0 $ (176.3 ) $ 505.7 Trade name 7.0 (4.9 ) 2.1 7.0 (4.6 ) 2.4 7.1 (3.6 ) 3.5 Acquired technology 85.1 (42.5 ) 42.6 85.4 (39.6 ) 45.8 86.5 (30.9 ) 55.6 Other 0.7 (0.6 ) 0.1 0.7 (0.6 ) 0.1 2.3 (2.0 ) 0.3 Total intangible assets $ 766.1 $ (271.9 ) $ 494.2 $ 768.3 $ (256.7 ) $ 511.6 $ 777.9 $ (212.8 ) $ 565.1

EARNINGS PER SHARE (Tables)

EARNINGS PER SHARE (Tables)	3 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Basic and Diluted Earnings Per Share Table	Three Months Ended March 31, 2019 2018 Computation of Income per Share (In millions, except per share data) Net income $ 41.7 $ 20.9 Basic shares 165.0 167.2 Basic net income per share $ 0.25 $ 0.13 Diluted shares: Basic shares 165.0 167.2 Stock-based compensation 1.1 2.0 Diluted shares 166.1 169.2 Diluted net income per share $ 0.25 $ 0.12

LEASES (Tables)

LEASES (Tables)	3 Months Ended
	Mar. 31, 2019
Leases [Abstract]
Balance Sheet Lease Location	The amounts for leases included in our condensed balance sheet include: March 31, 2019 Assets: Balance sheet location: ($ in millions) Operating Operating lease assets, net $ 275.1 Finance Property, plant and equipment, less accumulated depreciation (1) 5.9 Total lease assets $ 281.0 Liabilities: Current Operating Current operating lease liabilities $ 69.4 Finance Current installments of long-term debt 1.1 Long-term Operating Operating lease liabilities 206.0 Finance Long-term debt 4.7 Total lease liabilities $ 281.2 (1) As of March 31, 2019 , assets recorded under finance leases were $9.4 million and accumulated depreciation associated with finance leases was $3.5 million .
Lease Expense	The components of lease expense are recorded to cost of goods sold and selling and administration expenses in the condensed statement of operations, excluding interest on finance lease liabilities which is recorded to interest expense. The components of lease expense were as follows: Three Months Ended March 31, 2019 Lease expense: ($ in millions) Operating $ 22.2 Other operating lease expense (1) 6.9 Finance: Depreciation of leased assets 0.3 Interest on lease liabilities 0.1 Total lease expense $ 29.5 (1) Includes costs associated with short-term leases and variable lease expenses.
Operating Lease Liability Maturity Schedule	The maturities of lease liabilities were as follows: March 31, 2019 Operating leases Finance leases Total ($ in millions) 2019 $ 59.7 $ 1.0 $ 60.7 2020 62.9 2.1 65.0 2021 45.6 0.8 46.4 2022 32.3 0.8 33.1 2023 23.8 0.6 24.4 Thereafter 101.1 1.0 102.1 Total lease payments 325.4 6.3 331.7 Less: Imputed interest (1) (50.0 ) (0.5 ) (50.5 ) Present value of lease liabilities $ 275.4 $ 5.8 $ 281.2 (1) Calculated using the discount rate for each lease.
Finance Lease Liability Maturity Schedule	The maturities of lease liabilities were as follows: March 31, 2019 Operating leases Finance leases Total ($ in millions) 2019 $ 59.7 $ 1.0 $ 60.7 2020 62.9 2.1 65.0 2021 45.6 0.8 46.4 2022 32.3 0.8 33.1 2023 23.8 0.6 24.4 Thereafter 101.1 1.0 102.1 Total lease payments 325.4 6.3 331.7 Less: Imputed interest (1) (50.0 ) (0.5 ) (50.5 ) Present value of lease liabilities $ 275.4 $ 5.8 $ 281.2 (1) Calculated using the discount rate for each lease.
Contractual commitments under non-cancelable operating leases	December 31, 2018 ($ in millions) 2019 $ 82.2 2020 61.4 2021 44.2 2022 31.8 2023 23.2 Thereafter 102.6 Total lease payments $ 345.4
Supplemental Lease Information	Other information related to leases was as follows: Three Months Ended March 31, 2019 Supplemental cash flows information: ($ in millions) Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 22.0 Operating cash flows from finance leases 0.1 Financing cash flows from finance leases 0.2 Non-cash increase in lease assets and lease liabilities: Operating leases $ 3.6 Finance leases 1.9 Weighted-average remaining lease term: March 31, 2019 Operating leases 9.3 years Finance leases 3.8 years Weighted-average discount rate: Operating leases 3.33 % Finance leases 3.34 %

SHAREHOLDERS' EQUITY (Tables)

SHAREHOLDERS' EQUITY (Tables)	3 Months Ended
	Mar. 31, 2019
Stockholders' Equity Note [Abstract]
Activity included in accumulated other comprehensive loss table	The following table represents the activity included in accumulated other comprehensive loss: Foreign Currency Translation Adjustment (net of taxes) Unrealized Gains (Losses) on Derivative Contracts (net of taxes) Pension and Other Postretirement Benefits (net of taxes) Accumulated Other Comprehensive Loss ($ in millions) Balance at January 1, 2018 $ 7.6 $ 11.1 $ (503.3 ) $ (484.6 ) Unrealized gains 12.4 2.1 — 14.5 Reclassification adjustments of (gains) losses into income — (2.3 ) 9.4 7.1 Tax benefit (provision) — 0.1 (4.0 ) (3.9 ) Net change 12.4 (0.1 ) 5.4 17.7 Income tax reclassification adjustment 15.3 2.4 (103.6 ) (85.9 ) Balance at March 31, 2018 $ 35.3 $ 13.4 $ (601.5 ) $ (552.8 ) Balance at January 1, 2019 $ 0.7 $ 1.8 $ (653.5 ) $ (651.0 ) Unrealized losses (8.3 ) (6.6 ) — (14.9 ) Reclassification adjustments of losses into income — 2.2 7.4 9.6 Tax benefit (provision) — 1.1 (1.7 ) (0.6 ) Net change (8.3 ) (3.3 ) 5.7 (5.9 ) Balance at March 31, 2019 $ (7.6 ) $ (1.5 ) $ (647.8 ) $ (656.9 )

SEGMENT INFORMATION (Tables)

SEGMENT INFORMATION (Tables)	3 Months Ended
	Mar. 31, 2019
Segment Reporting [Abstract]
Segment Information	Three Months Ended March 31, 2019 2018 Sales: ($ in millions) Chlor Alkali Products and Vinyls $ 872.2 $ 936.1 Epoxy 524.0 603.3 Winchester 157.2 170.9 Total sales $ 1,553.4 $ 1,710.3 Income (loss) before taxes: Chlor Alkali Products and Vinyls $ 120.4 $ 130.5 Epoxy 10.5 (22.1 ) Winchester 9.1 12.0 Corporate/other: Environmental expense (1.8 ) (2.3 ) Other corporate and unallocated costs (39.1 ) (36.5 ) Restructuring charges (4.0 ) (4.0 ) Acquisition-related costs — (0.3 ) Other operating income 0.1 8.1 Interest expense (57.4 ) (63.7 ) Interest income 0.2 0.4 Non-operating pension income 3.9 5.4 Other income 11.2 — Income before taxes $ 53.1 $ 27.5
Disaggregation of Revenue	Three Months Ended March 31, 2019 Chlor Alkali Products and Vinyls Epoxy Winchester Total Sales: ($ in millions) United States $ 604.0 $ 164.1 $ 141.3 $ 909.4 Europe 38.6 235.4 2.8 276.8 Other foreign 229.6 124.5 13.1 367.2 Total Sales $ 872.2 $ 524.0 $ 157.2 $ 1,553.4 Three Months Ended March 31, 2018 Chlor Alkali Products and Vinyls Epoxy Winchester Total Sales: ($ in millions) United States $ 608.1 $ 180.4 $ 158.6 $ 947.1 Europe 45.8 278.5 1.0 325.3 Other foreign 282.2 144.4 11.3 437.9 Total Sales $ 936.1 $ 603.3 $ 170.9 $ 1,710.3 Three Months Ended March 31, 2019 2018 Sales: ($ in millions) Chlor Alkali Products and Vinyls Caustic soda $ 462.1 $ 536.9 Chlorine, chlorine-derivatives and other co-products 410.1 399.2 Total Chlor Alkali Products and Vinyls 872.2 936.1 Epoxy Aromatics and allylics 243.8 308.4 Epoxy resins 280.2 294.9 Total Epoxy 524.0 603.3 Winchester Commercial 106.4 111.2 Military and law enforcement 50.8 59.7 Total Winchester 157.2 170.9 Total Sales $ 1,553.4 $ 1,710.3

STOCK-BASED COMPENSATION (Table

STOCK-BASED COMPENSATION (Tables)	3 Months Ended
	Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-based compensation expense	Stock-based compensation expense was as follows: Three Months Ended March 31, 2019 2018 ($ in millions) Stock-based compensation $ 5.6 $ 6.5 Mark-to-market adjustments 1.3 (3.2 ) Total expense $ 6.9 $ 3.3
Schedule of fair value of stock options granted	The fair value of each stock option granted, which typically vests ratably over three years, but not less than one year, was estimated on the date of grant, using the Black-Scholes option-pricing model with the following weighted-average assumptions: Grant date 2019 2018 Dividend yield 3.05 % 2.43 % Risk-free interest rate 2.51 % 2.72 % Expected volatility 34 % 32 % Expected life (years) 6.0 6.0 Weighted-average grant fair value (per option) $ 6.76 $ 8.89 Weighted-average exercise price $ 26.26 $ 32.94 Shares granted 1,575,900 927,000

PENSION PLANS AND RETIREMENT _2

PENSION PLANS AND RETIREMENT BENEFITS (Tables)	3 Months Ended
	Mar. 31, 2019
Retirement Benefits [Abstract]
Components of Net Periodic Benefit (Income) Cost	Pension Benefits Other Postretirement Three Months Ended March 31, Three Months Ended March 31, 2019 2018 2019 2018 Components of Net Periodic Benefit (Income) Cost ($ in millions) Service cost $ 3.1 $ 2.7 $ 0.3 $ 0.3 Interest cost 23.6 21.6 0.4 0.4 Expected return on plans’ assets (35.3 ) (36.8 ) — — Recognized actuarial loss 6.8 8.8 0.6 0.6 Net periodic benefit (income) cost $ (1.8 ) $ (3.7 ) $ 1.3 $ 1.3

INCOME TAXES (Tables)

INCOME TAXES (Tables)	3 Months Ended
	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits	The amount of unrecognized tax benefits was as follows: March 31, 2019 2018 ($ in millions) Balance at beginning of year $ 33.8 $ 36.3 Increases for current year tax positions 0.6 0.5 Balance at end of period $ 34.4 $ 36.8
Tax Returns Subject to Examination	For our primary tax jurisdictions, the tax years that remain subject to examination are as follows: Tax Years U.S. federal income tax 2013 - 2018 U.S. state income tax 2006 - 2018 Canadian federal income tax 2012 - 2018 Brazil 2014 - 2018 Germany 2015 - 2018 China 2014 - 2018 The Netherlands 2014 - 2018

DERIVATIVE FINANCIAL INSTRUME_2

DERIVATIVE FINANCIAL INSTRUMENTS (Tables)	3 Months Ended
	Mar. 31, 2019
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: March 31, 2019 December 31, 2018 March 31, 2018 ($ in millions) Natural gas $ 75.7 $ 58.4 $ 68.9 Other commodities 92.9 58.1 59.5 Total notional $ 168.6 $ 116.5 $ 128.4
Summary of location and fair value of derivative instruments on condensed balance sheets	The following table summarizes the location and fair value of the derivative instruments on our condensed balance sheets. The table disaggregates our net derivative assets and liabilities into gross components on a contract-by-contract basis before giving effect to master netting arrangements: March 31, 2019 December 31, 2018 March 31, 2018 ($ in millions) Asset Derivatives: Other current assets Derivatives designated as hedging instruments: Interest rate contracts - gains $ 3.6 $ 5.3 $ 8.5 Commodity contracts - gains 3.2 — 7.2 Commodity contracts - losses (0.6 ) — (1.2 ) Derivatives not designated as hedging instruments: Foreign exchange contracts - gains 0.6 0.9 1.1 Foreign exchange contracts - losses (0.3 ) (0.5 ) (0.6 ) Total other current assets 6.5 5.7 15.0 Other assets Derivatives designated as hedging instruments: Interest rate contracts - gains — — 3.7 Commodity contracts - gains 2.2 0.9 0.4 Commodity contracts - losses (0.1 ) (0.2 ) (0.1 ) Total other assets 2.1 0.7 4.0 Total Asset Derivatives (1) $ 8.6 $ 6.4 $ 19.0 Liability Derivatives: Accrued liabilities Derivatives designated as hedging instruments: Commodity contracts - losses $ 9.8 $ 4.9 $ 1.0 Commodity contracts - gains (0.6 ) (1.9 ) (0.2 ) Derivatives not designated as hedging instruments: Foreign exchange contracts - losses 0.2 0.6 — Foreign exchange contracts - gains — (0.1 ) — Total accrued liabilities 9.4 3.5 0.8 Other liabilities Derivatives designated as hedging instruments: Interest rate contracts - losses 23.5 33.7 40.3 Commodity contracts - losses 0.9 0.5 — Commodity contracts - gains — (0.1 ) — Total other liabilities 24.4 34.1 40.3 Total Liability Derivatives (1) $ 33.8 $ 37.6 $ 41.1 (1) Does not include the impact of cash collateral received from or provided to counterparties.
Summary of effects of derivative instruments on condensed statements of income	The following table summarizes the effects of derivative instruments on our condensed statements of operations: Amount of (Loss) Gain Three Months Ended March 31, Location of (Loss) Gain 2019 2018 Derivatives – Cash Flow Hedges ($ in millions) Recognized in other comprehensive income: Commodity contracts ——— $ (6.2 ) $ (1.0 ) Interest rate contracts ——— (0.4 ) 3.1 $ (6.6 ) $ 2.1 Reclassified from accumulated other comprehensive loss into income: Interest rate contracts Interest expense $ 1.3 $ 1.3 Commodity contracts Cost of goods sold (3.5 ) 1.0 $ (2.2 ) $ 2.3 Derivatives – Fair Value Hedges Interest rate contracts Interest expense $ (0.7 ) $ 0.2 Derivatives Not Designated as Hedging Instruments Foreign exchange contracts Selling and administration $ (2.4 ) $ 0.5

FAIR VALUE MEASUREMENTS (Tables

FAIR VALUE MEASUREMENTS (Tables)	3 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Table of financial instruments measured at fair value	The following table summarizes the assets and liabilities measured at fair value in the condensed balance sheets: Fair Value Measurements Balance at March 31, 2019 Level 1 Level 2 Level 3 Total Assets ($ in millions) Interest rate swaps $ — $ 3.6 $ — $ 3.6 Commodity contracts — 4.7 — 4.7 Foreign exchange contracts — 0.3 — 0.3 Total Assets $ — $ 8.6 $ — $ 8.6 Liabilities Interest rate swaps $ — $ 23.5 $ — $ 23.5 Commodity contracts — 10.1 — 10.1 Foreign exchange contracts — 0.2 — 0.2 Total Liabilities $ — $ 33.8 $ — $ 33.8 Balance at December 31, 2018 Assets Interest rate swaps $ — $ 5.3 $ — $ 5.3 Commodity contracts — 0.7 — 0.7 Foreign exchange contracts — 0.4 — 0.4 Total Assets $ — $ 6.4 $ — $ 6.4 Liabilities Interest rate swaps $ — $ 33.7 $ — $ 33.7 Commodity contracts — 3.4 — 3.4 Foreign exchange contracts — 0.5 — 0.5 Total Liabilities $ — $ 37.6 $ — $ 37.6 Balance at March 31, 2018 Assets Interest rate swaps $ — $ 12.2 $ — $ 12.2 Commodity contracts — 6.3 — 6.3 Foreign exchange contracts — 0.5 — 0.5 Total Assets $ — $ 19.0 $ — $ 19.0 Liabilities Interest rate swaps $ — $ 40.3 $ — $ 40.3 Commodity contracts — 0.8 — 0.8 Total Liabilities $ — $ 41.1 $ — $ 41.1
Fair value of debt table	The following table summarizes the fair value measurements of debt and the actual debt recorded on our condensed balance sheets: Fair Value Measurements Amount recorded Level 1 Level 2 Level 3 Total ($ in millions) Balance at March 31, 2019 $ — $ 3,221.9 $ 153.0 $ 3,374.9 $ 3,193.3 Balance at December 31, 2018 — 3,137.2 153.0 3,290.2 3,230.3 Balance at March 31, 2018 — 3,583.9 153.0 3,736.9 3,535.4

SUPPLEMENTAL GUARANTOR FINANC_2

SUPPLEMENTAL GUARANTOR FINANCIAL INFORMATION (Tables)	3 Months Ended
	Mar. 31, 2019
Supplemental Guarantor Financial Information [Abstract]
Supplemental Guarantor Financial Information Balance Sheets	CONDENSED CONSOLIDATING BALANCE SHEETS March 31, 2019 (In millions) (Unaudited) Parent Guarantor Issuer Subsidiary Eliminations Total Assets Current assets: Cash and cash equivalents $ 6.0 $ — $ 99.7 $ — $ 105.7 Receivables, net 99.0 — 709.3 — 808.3 Intercompany receivables — — 2,664.7 (2,664.7 ) — Income taxes receivable 0.3 — 6.0 — 6.3 Inventories, net 172.3 — 545.2 — 717.5 Other current assets 235.7 — 3.5 (192.5 ) 46.7 Total current assets 513.3 — 4,028.4 (2,857.2 ) 1,684.5 Property, plant and equipment, net 674.0 — 2,759.5 — 3,433.5 Operating lease assets, net 48.9 — 226.2 — 275.1 Investment in subsidiaries 7,024.5 4,339.5 — (11,364.0 ) — Deferred income taxes 3.2 — 31.9 (3.4 ) 31.7 Other assets 17.0 — 1,114.4 — 1,131.4 Long-term receivables—affiliates — 1,169.9 — (1,169.9 ) — Intangible assets, net 0.3 — 493.9 — 494.2 Goodwill — 966.3 1,153.2 — 2,119.5 Total assets $ 8,281.2 $ 6,475.7 $ 9,807.5 $ (15,394.5 ) $ 9,169.9 Liabilities and Shareholders’ Equity Current liabilities: Current installments of long-term debt $ 1.1 $ — $ 125.0 $ — $ 126.1 Accounts payable 75.8 — 566.8 (5.6 ) 637.0 Intercompany payables 2,664.7 — — (2,664.7 ) — Income taxes payable 3.7 — 9.3 — 13.0 Current operating lease liabilities 8.0 — 61.4 — 69.4 Accrued liabilities 138.3 — 345.9 (189.8 ) 294.4 Total current liabilities 2,891.6 — 1,108.4 (2,860.1 ) 1,139.9 Long-term debt 1,370.3 1,696.9 — — 3,067.2 Operating lease liabilities 42.0 — 164.0 — 206.0 Accrued pension liability 427.0 — 233.2 — 660.2 Deferred income taxes — 6.1 523.2 (3.4 ) 525.9 Long-term payables—affiliates 419.6 — 750.3 (1,169.9 ) — Other liabilities 293.1 5.5 434.5 — 733.1 Total liabilities 5,443.6 1,708.5 3,213.6 (4,033.4 ) 6,332.3 Commitments and contingencies Shareholders’ equity: Common stock 164.9 — 14.6 (14.6 ) 164.9 Additional paid-in capital 2,239.2 4,125.7 4,808.2 (8,933.9 ) 2,239.2 Accumulated other comprehensive loss (656.9 ) — (8.1 ) 8.1 (656.9 ) Retained earnings 1,090.4 641.5 1,779.2 (2,420.7 ) 1,090.4 Total shareholders’ equity 2,837.6 4,767.2 6,593.9 (11,361.1 ) 2,837.6 Total liabilities and shareholders’ equity $ 8,281.2 $ 6,475.7 $ 9,807.5 $ (15,394.5 ) $ 9,169.9 CONDENSED CONSOLIDATING BALANCE SHEETS December 31, 2018 (In millions) (Unaudited) Parent Guarantor Issuer Subsidiary Eliminations Total Assets Current assets: Cash and cash equivalents $ 92.0 $ — $ 86.8 $ — $ 178.8 Receivables, net 99.7 — 676.6 — 776.3 Intercompany receivables — — 2,558.2 (2,558.2 ) — Income taxes receivable 2.6 — 3.3 — 5.9 Inventories, net 161.4 — 550.0 — 711.4 Other current assets 220.2 — 1.8 (187.0 ) 35.0 Total current assets 575.9 — 3,876.7 (2,745.2 ) 1,707.4 Property, plant and equipment, net 651.4 — 2,830.7 — 3,482.1 Investment in subsidiaries 6,943.3 4,286.9 — (11,230.2 ) — Deferred income taxes 7.3 — 27.4 (8.4 ) 26.3 Other assets 24.3 — 1,126.1 — 1,150.4 Long-term receivables—affiliates — 1,247.2 — (1,247.2 ) — Intangible assets, net 0.3 — 511.3 — 511.6 Goodwill — 966.3 1,153.3 — 2,119.6 Total assets $ 8,202.5 $ 6,500.4 $ 9,525.5 $ (15,231.0 ) $ 8,997.4 Liabilities and Shareholders’ Equity Current liabilities: Current installments of long-term debt $ 0.9 $ — $ 125.0 $ — $ 125.9 Accounts payable 90.1 — 549.4 (3.0 ) 636.5 Intercompany payables 2,558.2 — — (2,558.2 ) — Income taxes payable 3.9 — 18.7 — 22.6 Accrued liabilities 150.3 — 367.5 (184.5 ) 333.3 Total current liabilities 2,803.4 — 1,060.6 (2,745.7 ) 1,118.3 Long-term debt 1,357.5 1,746.9 — — 3,104.4 Accrued pension liability 439.1 — 235.2 — 674.3 Deferred income taxes — 6.0 521.3 (8.4 ) 518.9 Long-term payables—affiliates 469.6 — 777.6 (1,247.2 ) — Other liabilities 300.7 5.5 443.1 — 749.3 Total liabilities 5,370.3 1,758.4 3,037.8 (4,001.3 ) 6,165.2 Commitments and contingencies Shareholders’ equity: Common stock 165.3 — 14.6 (14.6 ) 165.3 Additional paid-in capital 2,247.4 4,125.7 4,808.2 (8,933.9 ) 2,247.4 Accumulated other comprehensive loss (651.0 ) — (6.9 ) 6.9 (651.0 ) Retained earnings 1,070.5 616.3 1,671.8 (2,288.1 ) 1,070.5 Total shareholders’ equity 2,832.2 4,742.0 6,487.7 (11,229.7 ) 2,832.2 Total liabilities and shareholders’ equity $ 8,202.5 $ 6,500.4 $ 9,525.5 $ (15,231.0 ) $ 8,997.4 CONDENSED CONSOLIDATING BALANCE SHEETS March 31, 2018 (In millions) (Unaudited) Parent Guarantor Issuer Subsidiary Eliminations Total Assets Current assets: Cash and cash equivalents $ 3.6 $ — $ 105.5 $ — $ 109.1 Receivables, net 119.6 — 716.0 — 835.6 Intercompany receivables — — 2,191.7 (2,191.7 ) — Income taxes receivable 11.4 — 6.1 — 17.5 Inventories, net 160.2 — 515.4 — 675.6 Other current assets 223.7 — 7.3 (169.8 ) 61.2 Total current assets 518.5 — 3,542.0 (2,361.5 ) 1,699.0 Property, plant and equipment, net 551.8 — 2,987.6 — 3,539.4 Investment in subsidiaries 6,720.1 4,114.5 — (10,834.6 ) — Deferred income taxes 43.7 — 42.5 (46.8 ) 39.4 Other assets 47.3 — 1,149.7 — 1,197.0 Long-term receivables—affiliates — 1,537.5 — (1,537.5 ) — Intangible assets, net 0.3 — 564.8 — 565.1 Goodwill — 966.3 1,154.0 — 2,120.3 Total assets $ 7,881.7 $ 6,618.3 $ 9,440.6 $ (14,780.4 ) $ 9,160.2 Liabilities and Shareholders’ Equity Current liabilities: Current installments of long-term debt $ 0.7 $ — $ — $ — $ 0.7 Accounts payable 62.0 — 639.7 (3.5 ) 698.2 Intercompany payables 2,191.7 — — (2,191.7 ) — Income taxes payable 2.3 — 13.7 — 16.0 Accrued liabilities 115.0 — 308.7 (167.6 ) 256.1 Total current liabilities 2,371.7 — 962.1 (2,362.8 ) 971.0 Long-term debt 1,352.2 1,952.2 230.3 — 3,534.7 Accrued pension liability 391.4 — 237.3 — 628.7 Deferred income taxes — 4.1 541.1 (46.8 ) 498.4 Long-term payables—affiliates 680.0 — 857.5 (1,537.5 ) — Other liabilities 323.3 5.6 435.4 — 764.3 Total liabilities 5,118.6 1,961.9 3,263.7 (3,947.1 ) 6,397.1 Commitments and contingencies Shareholders’ equity: Common stock 167.2 — 14.6 (14.6 ) 167.2 Additional paid-in capital 2,285.0 4,125.7 4,808.2 (8,933.9 ) 2,285.0 Accumulated other comprehensive loss (552.8 ) — (4.8 ) 4.8 (552.8 ) Retained earnings 863.7 530.7 1,358.9 (1,889.6 ) 863.7 Total shareholders’ equity 2,763.1 4,656.4 6,176.9 (10,833.3 ) 2,763.1 Total liabilities and shareholders’ equity $ 7,881.7 $ 6,618.3 $ 9,440.6 $ (14,780.4 ) $ 9,160.2
Supplemental Guarantor Financial Information Statement of Operations	CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS Three Months Ended March 31, 2019 (In millions) (Unaudited) Parent Guarantor Issuer Subsidiary Eliminations Total Sales $ 332.8 $ — $ 1,327.7 $ (107.1 ) $ 1,553.4 Operating expenses: Cost of goods sold 304.1 — 1,150.3 (107.1 ) 1,347.3 Selling and administration 51.8 — 55.2 — 107.0 Restructuring charges 1.4 — 2.6 — 4.0 Acquisition-related costs — — — — — Other operating (loss) income (2.1 ) — 2.2 — 0.1 Operating (loss) income (26.6 ) — 121.8 — 95.2 Equity income in subsidiaries 62.6 52.6 — (115.2 ) — Interest expense 17.4 36.1 5.2 (1.3 ) 57.4 Interest income 0.6 — 0.9 (1.3 ) 0.2 Non-operating pension income (expense) 5.4 — (1.5 ) — 3.9 Other income 11.2 — — — 11.2 Income before taxes 35.8 16.5 116.0 (115.2 ) 53.1 Income tax (benefit) provision (5.9 ) (8.7 ) 26.0 — 11.4 Net income $ 41.7 $ 25.2 $ 90.0 $ (115.2 ) $ 41.7 CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS Three Months Ended March 31, 2018 (In millions) (Unaudited) Parent Guarantor Issuer Subsidiary Eliminations Total Sales $ 352.7 $ — $ 1,467.0 $ (109.4 ) $ 1,710.3 Operating expenses: Cost of goods sold 312.0 — 1,326.1 (109.4 ) 1,528.7 Selling and administration 47.1 — 53.4 — 100.5 Restructuring charges — — 4.0 — 4.0 Acquisition-related costs 0.3 — — — 0.3 Other operating income 5.8 — 2.3 — 8.1 Operating (loss) income (0.9 ) — 85.8 — 84.9 Earnings of non-consolidated affiliates 0.5 — — — 0.5 Equity income in subsidiaries 28.4 22.2 — (50.6 ) — Interest expense 17.0 41.3 6.9 (1.5 ) 63.7 Interest income 1.0 — 0.9 (1.5 ) 0.4 Non-operating pension income (expense) 6.7 — (1.3 ) — 5.4 Income (loss) before taxes 18.7 (19.1 ) 78.5 (50.6 ) 27.5 Income tax (benefit) provision (2.2 ) (9.9 ) 18.7 — 6.6 Net income (loss) $ 20.9 $ (9.2 ) $ 59.8 $ (50.6 ) $ 20.9 CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME (LOSS) Three Months Ended March 31, 2019 (In millions) (Unaudited) Parent Guarantor Issuer Subsidiary Eliminations Total Net income $ 41.7 $ 25.2 $ 90.0 $ (115.2 ) $ 41.7 Other comprehensive income (loss), net of tax: Foreign currency translation adjustments, net — — (8.3 ) — (8.3 ) Unrealized losses on derivative contracts, net (3.3 ) — — — (3.3 ) Amortization of prior service costs and actuarial losses, net 5.1 — 0.6 — 5.7 Total other comprehensive income (loss), net of tax 1.8 — (7.7 ) — (5.9 ) Comprehensive income $ 43.5 $ 25.2 $ 82.3 $ (115.2 ) $ 35.8
Supplemental Guarantor Financial Information Statements Of Comprehensive Income	CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME (LOSS) Three Months Ended March 31, 2019 (In millions) (Unaudited) Parent Guarantor Issuer Subsidiary Eliminations Total Net income $ 41.7 $ 25.2 $ 90.0 $ (115.2 ) $ 41.7 Other comprehensive income (loss), net of tax: Foreign currency translation adjustments, net — — (8.3 ) — (8.3 ) Unrealized losses on derivative contracts, net (3.3 ) — — — (3.3 ) Amortization of prior service costs and actuarial losses, net 5.1 — 0.6 — 5.7 Total other comprehensive income (loss), net of tax 1.8 — (7.7 ) — (5.9 ) Comprehensive income $ 43.5 $ 25.2 $ 82.3 $ (115.2 ) $ 35.8 CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME (LOSS) Three Months Ended March 31, 2018 (In millions) (Unaudited) Parent Guarantor Issuer Subsidiary Eliminations Total Net income (loss) $ 20.9 $ (9.2 ) $ 59.8 $ (50.6 ) $ 20.9 Other comprehensive income, net of tax: Foreign currency translation adjustments, net — — 12.4 — 12.4 Unrealized losses on derivative contracts, net (0.1 ) — — — (0.1 ) Amortization of prior service costs and actuarial losses, net 5.4 — — — 5.4 Total other comprehensive income, net of tax 5.3 — 12.4 — 17.7 Comprehensive income (loss) $ 26.2 $ (9.2 ) $ 72.2 $ (50.6 ) $ 38.6 CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS Three Months Ended March 31, 2019 (In millions) (Unaudited) Parent Guarantor Issuer Subsidiary Eliminations Total Net operating activities $ 39.7 $ — $ 64.6 $ — $ 104.3 Investing Activities Capital expenditures (50.7 ) — (51.5 ) — (102.2 ) Proceeds from disposition of non-consolidated affiliate 20.0 — — — 20.0 Net investing activities (30.7 ) — (51.5 ) — (82.2 ) Financing Activities Long-term debt repayments (0.2 ) (50.0 ) — — (50.2 ) Common stock repurchased and retired (13.2 ) — — — (13.2 ) Stock options exercised 1.4 — — — 1.4 Dividends paid (33.0 ) — — — (33.0 ) Intercompany financing activities (50.0 ) 50.0 — — — Net financing activities (95.0 ) — — — (95.0 ) Effect of exchange rate changes on cash and cash equivalents — — (0.2 ) — (0.2 ) Net (decrease) increase in cash and cash equivalents (86.0 ) — 12.9 — (73.1 ) Cash and cash equivalents, beginning of period 92.0 — 86.8 — 178.8 Cash and cash equivalents, end of period $ 6.0 $ — $ 99.7 $ — $ 105.7
Supplemental Guarantor Financial Information Statements Of Cash Flows	CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS Three Months Ended March 31, 2019 (In millions) (Unaudited) Parent Guarantor Issuer Subsidiary Eliminations Total Net operating activities $ 39.7 $ — $ 64.6 $ — $ 104.3 Investing Activities Capital expenditures (50.7 ) — (51.5 ) — (102.2 ) Proceeds from disposition of non-consolidated affiliate 20.0 — — — 20.0 Net investing activities (30.7 ) — (51.5 ) — (82.2 ) Financing Activities Long-term debt repayments (0.2 ) (50.0 ) — — (50.2 ) Common stock repurchased and retired (13.2 ) — — — (13.2 ) Stock options exercised 1.4 — — — 1.4 Dividends paid (33.0 ) — — — (33.0 ) Intercompany financing activities (50.0 ) 50.0 — — — Net financing activities (95.0 ) — — — (95.0 ) Effect of exchange rate changes on cash and cash equivalents — — (0.2 ) — (0.2 ) Net (decrease) increase in cash and cash equivalents (86.0 ) — 12.9 — (73.1 ) Cash and cash equivalents, beginning of period 92.0 — 86.8 — 178.8 Cash and cash equivalents, end of period $ 6.0 $ — $ 99.7 $ — $ 105.7 CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS Three Months Ended March 31, 2018 (In millions) (Unaudited) Parent Guarantor Issuer Subsidiary Eliminations Total Net operating activities $ 69.3 $ — $ 11.6 $ — $ 80.9 Investing Activities Capital expenditures (41.7 ) — (47.8 ) — (89.5 ) Proceeds from disposition of property, plant and equipment — — 0.1 — 0.1 Net investing activities (41.7 ) — (47.7 ) — (89.4 ) Financing Activities Long-term debt: Borrowings 550.0 — 0.3 — 550.3 Repayments (20.2 ) (570.0 ) (19.7 ) — (609.9 ) Stock options exercised 1.0 — — — 1.0 Dividends paid (33.4 ) — — — (33.4 ) Debt issuance costs (8.5 ) — — — (8.5 ) Intercompany financing activities (570.0 ) 570.0 — — — Net financing activities (81.1 ) — (19.4 ) — (100.5 ) Effect of exchange rate changes on cash and cash equivalents — — (0.3 ) — (0.3 ) Net decrease in cash and cash equivalents (53.5 ) — (55.8 ) — (109.3 ) Cash and cash equivalents, beginning of period 57.1 — 161.3 — 218.4 Cash and cash equivalents, end of period $ 3.6 $ — $ 105.5 $ — $ 109.1

ACCOUNTING POLICIES (Details)

ACCOUNTING POLICIES (Details) - USD ($) $ in Millions	Jan. 01, 2019	Mar. 31, 2019
Accounting Policies [Abstract]
Lease accounting adoption asset and liability	$ 291.9
Lease accounting adoption adjustment	$ 11.2	$ 11.2

ACQUISITION (Details Textuals)

ACQUISITION (Details Textuals) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Business Combinations [Abstract]
Acquisition-related costs	$ 0	$ 0.3

RESTRUCTURING CHARGES (Details

RESTRUCTURING CHARGES (Details 1) $ in Millions	3 Months Ended		36 Months Ended	52 Months Ended
	Mar. 31, 2019USD ($)	Mar. 31, 2018USD ($)	Mar. 31, 2019USD ($)	Mar. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Mar. 21, 2016T
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 4	$ 4		$ 186
Inception to date Amounts Utilized (cash)				92.9
Inception to date Amounts Utilized (non-cash)				84.6
Accrued restructuring costs	8.5	6.3	$ 8.5	8.5	$ 8.2	$ 5.1
Geelong | Winchester
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.1
Additional restructuring and related expected cost	1		1	1
Other Winchester | Winchester
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1.4
Capacity Reductions | Chlor Alkali Products and Vinyls
Restructuring Cost and Reserve [Line Items]
Total Product Segment Production Capacity Decrease | T							433,000
Henderson Product Segment Production Capacity Decrease | T							153,000
Niagara Product Segment Production Capacity | T							300,000
Reduced Niagara Segment Production Capacity | T							240,000
Freeport Product Segment Production Capacity Decrease | T							220,000
Restructuring charges	2.5	3	162.2
Additional restructuring and related expected cost	8		8	8
Becancour | Chlor Alkali Products and Vinyls
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 1		18.2
Additional restructuring and related expected cost	$ 1		$ 1	$ 1

RESTRUCTURING CHARGES (Detail_2

RESTRUCTURING CHARGES (Details 2) - USD ($) $ in Millions	3 Months Ended		52 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Accrued restructuring costs	$ 8.5	$ 6.3	$ 8.5	$ 8.2	$ 5.1
Restructuring charges	4	4	186
Amounts utilized	(3.7)	(2.8)
Employee severance and related benefit costs
Restructuring Cost and Reserve [Line Items]
Accrued restructuring costs	2.2	1.3	2.2	1.5	1.8
Restructuring charges	1.4	0	11.3
Amounts utilized	(0.7)	(0.5)
Lease and other contract termination costs
Restructuring Cost and Reserve [Line Items]
Accrued restructuring costs	5.5	2.9	5.5	6	3.3
Restructuring charges	0.1	0.4	46.6
Amounts utilized	(0.6)	(0.8)
Employee relocation costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges			1.7
Facility exit costs
Restructuring Cost and Reserve [Line Items]
Accrued restructuring costs	0.8	2.1	0.8	$ 0.7	$ 0
Restructuring charges	2.5	3.6	42.2
Amounts utilized	$ (2.4)	$ (1.5)
Write-off of equipment and facility
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 84.2

RESTRUCTURING CHARGES (Detail_3

RESTRUCTURING CHARGES (Details 3) - USD ($) $ in Millions	3 Months Ended		4 Months Ended	36 Months Ended	52 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2019	Mar. 31, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 4	$ 4			$ 186
Write-off of equipment and facility
Restructuring Cost and Reserve [Line Items]
Restructuring charges					84.2
Employee severance and related benefit costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1.4	0			11.3
Facility exit costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2.5	3.6			42.2
Employee relocation costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges					1.7
Lease and other contract termination costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.1	0.4			46.6
Becancour | Chlor Alkali Products and Vinyls
Restructuring Cost and Reserve [Line Items]
Restructuring charges		1			18.2
Becancour | Chlor Alkali Products and Vinyls | Write-off of equipment and facility
Restructuring Cost and Reserve [Line Items]
Restructuring charges					3.5
Becancour | Chlor Alkali Products and Vinyls | Employee severance and related benefit costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges					2.7
Becancour | Chlor Alkali Products and Vinyls | Facility exit costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges					5.9
Becancour | Chlor Alkali Products and Vinyls | Employee relocation costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges					0
Becancour | Chlor Alkali Products and Vinyls | Lease and other contract termination costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges					$ 6.1
Capacity Reductions | Chlor Alkali Products and Vinyls
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 2.5	$ 3		$ 162.2
Capacity Reductions | Chlor Alkali Products and Vinyls | Write-off of equipment and facility
Restructuring Cost and Reserve [Line Items]
Restructuring charges				78.1
Capacity Reductions | Chlor Alkali Products and Vinyls | Employee severance and related benefit costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges				5.9
Capacity Reductions | Chlor Alkali Products and Vinyls | Facility exit costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges				36.3
Capacity Reductions | Chlor Alkali Products and Vinyls | Employee relocation costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges				1.7
Capacity Reductions | Chlor Alkali Products and Vinyls | Lease and other contract termination costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges				$ 40.2
Total Winchester | Winchester
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 5.6
Total Winchester | Winchester | Write-off of equipment and facility
Restructuring Cost and Reserve [Line Items]
Restructuring charges			2.6
Total Winchester | Winchester | Employee severance and related benefit costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges			2.7
Total Winchester | Winchester | Facility exit costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges			0
Total Winchester | Winchester | Employee relocation costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges			0
Total Winchester | Winchester | Lease and other contract termination costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 0.3

ACCOUNTS RECEIVABLE (Details Te

ACCOUNTS RECEIVABLE (Details Textuals) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
ACCOUNTS RECEIVABLE [Abstract]
Receivables Financing Agreement Term	3 years
Receivables Financing Agreement Maximum Borrowing Capacity					$ 250
Receivables Financing Agreement Collateral	$ 352.8	$ 382.7	$ 360.4
Receivables Financing Agreement Outstanding Balance	125	230.3	125
Receivables Financing Agreement Available Borrowing Capacity	125
AR Facilities, Maximum Outstanding Sales	315
AR Facilities, Amount Outstanding to be Serviced	96.8	178.9	132.4	$ 182.3
AR Facilities, Gross receivables sold	134.9	413.1
AR Facilities, Payments received from customers on sold accounts	(170.5)	(416.5)
AR Facilities, Interest Expense	0.5	1.2
AR Facilities, Recourse Liability	$ 0	$ 0	$ 0

ALLOWANCE FOR DOUBTFUL ACCOUN_3

ALLOWANCE FOR DOUBTFUL ACCOUNTS RECEIVABLES (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accounts Receivable, Net [Abstract]
Balance at beginning of year	$ 12.9	$ 12.3
Provisions charged	0.5	1.1
Write-offs, net of recoveries	(0.1)	0
Foreign currency translation adjustment	(0.1)	0
Balance at end of period	$ 13.2	$ 13.4

INVENTORIES (Details)

INVENTORIES (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Inventory Disclosure [Abstract]
Supplies	$ 70.3	$ 66.4	$ 65.7
Raw materials	73.5	66.7	75.3
Work in process	145.6	139.6	139.8
Finished goods	498.7	488.5	440.8
Inventories excluding LIFO reserve	788.1	761.2	721.6
LIFO reserve	(70.6)	(49.8)	(46)
Inventories, net	$ 717.5	$ 711.4	$ 675.6

OTHER ASSETS (Details)

OTHER ASSETS (Details) - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2018
Other Assets [Abstract]
Supply contracts	$ 1,090.1		$ 1,127.7			$ 1,099.5
Investments in non-consolidated affiliates	0		29			8.8
Other	41.3		40.3			42.1
Other assets	1,131.4		1,197			$ 1,150.4
Schedule of Equity Method Investments [Line Items]
Bay Gas sale proceeds	20
Bay Gas realized gain on sale	11.2		0
2017 Supply Contract Payment				$ 209.4
Long-term Purchase Commitment [Line Items]
2020 Supply Contract Payment					$ 389.2
2020 Supply Contract Payment Total Accretion					$ 51.8
2020 Supply Contract Payment Accretion Expense	4		3.9
Amortization of Supply Contracts	9.4		$ 9.4
Minimum
Long-term Purchase Commitment [Line Items]
2020 Supply Contract Payment	440
Maximum
Long-term Purchase Commitment [Line Items]
2020 Supply Contract Payment	$ 465
Bay Gas
Schedule of Equity Method Investments [Line Items]
Bay Gas Olin ownership percentage	9.10%
Bay Gas sale proceeds	$ 20
Bay Gas realized gain on sale	$ 11.2
Bay Gas non-cash impairment charge		$ 21.5
Bay Gas Sempra ownership percentage	90.90%

GOODWILL AND INTANGIBLES (Detai

GOODWILL AND INTANGIBLES (Details 1) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Goodwill	$ 2,119.5	$ 2,120.3	$ 2,119.6	$ 2,120
Foreign currency translation adjustment	(0.1)	0.3
Chlor Alkali Products and Vinyls
Goodwill [Line Items]
Goodwill	1,832.5	1,833.1	1,832.6	1,832.9
Foreign currency translation adjustment	(0.1)	0.2
Epoxy
Goodwill [Line Items]
Goodwill	287	287.2	$ 287	$ 287.1
Foreign currency translation adjustment	$ 0	$ 0.1

GOODWILL AND INTANGIBLES (Det_2

GOODWILL AND INTANGIBLES (Details 2) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Assets, Gross	$ 766.1	$ 768.3	$ 777.9
Finite-Lived Intangible Assets, Accumulated Amortization	(271.9)	(256.7)	(212.8)
Finite-Lived Intangible Assets, Net	494.2	511.6	565.1
Customers, customer contracts and relationships
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Assets, Gross	673.3	675.2	682
Finite-Lived Intangible Assets, Accumulated Amortization	(223.9)	(211.9)	(176.3)
Finite-Lived Intangible Assets, Net	449.4	463.3	505.7
Trade name
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Assets, Gross	7	7	7.1
Finite-Lived Intangible Assets, Accumulated Amortization	(4.9)	(4.6)	(3.6)
Finite-Lived Intangible Assets, Net	2.1	2.4	3.5
Acquired technology
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Assets, Gross	85.1	85.4	86.5
Finite-Lived Intangible Assets, Accumulated Amortization	(42.5)	(39.6)	(30.9)
Finite-Lived Intangible Assets, Net	42.6	45.8	55.6
Other
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Assets, Gross	0.7	0.7	2.3
Finite-Lived Intangible Assets, Accumulated Amortization	(0.6)	(0.6)	(2)
Finite-Lived Intangible Assets, Net	$ 0.1	$ 0.1	$ 0.3

EARNINGS PER SHARE (Details)

EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net income	$ 41.7	$ 20.9
Basic shares	165	167.2
Basic net income per share	$ 0.25	$ 0.13
Earnings Per Share, Diluted [Abstract]
Basic shares	165	167.2
Stock-based compensation	1.1	2
Diluted shares	166.1	169.2
Diluted net income per share	$ 0.25	$ 0.12
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	5.6	2.5

ENVIRONMENTAL (Details)

ENVIRONMENTAL (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Environmental Remediation Obligations [Abstract]
Reserves for future environmental expenditures - total	$ 125.5	$ 131.2	$ 125.6
Reserves for future environmental expenditures - noncurrent	108.5	111.2	$ 108.6
Environmental expense	$ 1.8	$ 2.3

LEASES (Details 1)

LEASES (Details 1) $ in Millions	3 Months Ended
	Mar. 31, 2019USD ($)
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	$ 22
Operating cash flows from finance leases	0.1
Financing cash flows from finance leases	0.2
Operating Lease, Non-cash Increase in Lease Assets and Lease Liabilities	3.6
Finance Lease, Non-cash Increase in Lease Assets and Lease Liabilities	$ 1.9
Operating Lease, Weighted Average Remaining Lease Term	9 years 3 months
Finance Lease, Weighted Average Remaining Lease Term	3 years 10 months
Operating Lease, Weighted Average Discount Rate, Percent	3.33%
Finance Lease, Weighted Average Discount Rate, Percent	3.34%
Maximum
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	96 years
Office Space
Lessee, Operating Lease, Not yet Commenced, Description [Abstract]
Operating Lease, Lease Not yet Commenced, Expense	$ 20
Operating Lease, Lease Not yet Commenced, Term of Contract	10 years
Railcars
Lessee, Operating Lease, Not yet Commenced, Description [Abstract]
Operating Lease, Lease Not yet Commenced, Expense	$ 9
Railcars | Minimum
Lessee, Operating Lease, Not yet Commenced, Description [Abstract]
Operating Lease, Lease Not yet Commenced, Term of Contract	5 years
Railcars | Maximum
Lessee, Operating Lease, Not yet Commenced, Description [Abstract]
Operating Lease, Lease Not yet Commenced, Term of Contract	12 years

LEASES (Details 2)

LEASES (Details 2) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Balance Sheet Lease Location [Line Items]
Operating lease assets, net	$ 275.1	$ 0	$ 0
Lessee, Total Lease Assets	281
Current operating lease liabilities	69.4	0	0
Operating lease liabilities	206	$ 0	$ 0
Lessee, Total Lease Liabilities	281.2
Finance Lease, Gross Value	9.4
Finance Lease, Accumulated Depreciation	3.5
Operating lease assets, net
Balance Sheet Lease Location [Line Items]
Operating lease assets, net	275.1
Property, plant and equipment, less accumulated depreciation
Balance Sheet Lease Location [Line Items]
Finance Lease, Right-of-Use Asset	5.9
Current operating lease liabilities
Balance Sheet Lease Location [Line Items]
Current operating lease liabilities	69.4
Current installments of long-term debt
Balance Sheet Lease Location [Line Items]
Finance Lease, Liability, Current	1.1
Operating lease liabilities
Balance Sheet Lease Location [Line Items]
Operating lease liabilities	206
Long-term debt
Balance Sheet Lease Location [Line Items]
Finance Lease, Liability, Noncurrent	$ 4.7

LEASES (Details 3)

LEASES (Details 3) $ in Millions	3 Months Ended
	Mar. 31, 2019USD ($)
Leases [Abstract]
Operating lease expense	$ 22.2
Other operating lease expense	6.9
Finance Lease, Cost [Abstract]
Depreciation of lease assets	0.3
Interest on lease liabilities	0.1
Total lease expense	$ 29.5

LEASES (Details 4)

LEASES (Details 4) $ in Millions	Mar. 31, 2019USD ($)
Operating Lease Liabilities, Payments Due [Abstract]
2019	$ 59.7
2020	62.9
2021	45.6
2022	32.3
2023	23.8
Thereafter	101.1
Total lease payments	325.4
Less: Imputed interest	(50)
Present value of lease liabilities	275.4
Finance Lease Liabilities, Payments, Due [Abstract]
2019	1
2020	2.1
2021	0.8
2022	0.8
2023	0.6
Thereafter	1
Total lease payments	6.3
Less: Imputed interest	(0.5)
Present value of lease liabilities	5.8
Total Lease Liability, Payments, Due [Abstract]
2019	60.7
2020	65
2021	46.4
2022	33.1
2023	24.4
Thereafter	102.1
Total lease payments	331.7
Less: Imputed interest	(50.5)
Present value of lease liabilities	$ 281.2

LEASES (Details 5)

LEASES (Details 5) $ in Millions	Dec. 31, 2018USD ($)
Future minimum operating lease payments [Abstract]
2019	$ 82.2
2020	61.4
2021	44.2
2022	31.8
2023	23.2
Thereafter	102.6
Total lease payments	$ 345.4

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Legal action accrued liabilities	$ 15.8	$ 15.6	$ 13.3

SHAREHOLDERS' EQUITY (Details)

SHAREHOLDERS' EQUITY (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		5 Months Ended	9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Sep. 30, 2018	Sep. 30, 2018	Apr. 26, 2018
Equity, Class of Treasury Stock [Line Items]
Cost of common stock repurchased and retired (in dollars)	$ 13.2	$ 0
Stock options exercised	0.1	0.1
Total value of stock options exercised	$ 1.4	$ 1
Foreign Currency Translation Adjustment (net of taxes)
Beginning balance	0.7	7.6		$ 7.6
Unrealized gains (losses)	(8.3)	12.4
Reclassification adjustments of (gains) losses into income	0	0
Tax benefit (provision)	0	0
Net change	(8.3)	12.4
Income tax reclassification adjustment		15.3
Ending Balance	(7.6)	35.3
Unrealized Gains (Losses) on Derivative Contracts (net of taxes)
Beginning balance	1.8	11.1		11.1
Unrealized gains (losses)	(6.6)	2.1
Reclassification adjustments of (gains) losses into income	2.2	(2.3)
Tax benefit (provision)	1.1	0.1
Net change	(3.3)	(0.1)
Income tax reclassification adjustment		2.4
Ending balance	(1.5)	13.4
Pension and Other Postretirement Benefits (net of taxes)
Beginning balance	(653.5)	(503.3)		(503.3)
Unrealized gains (losses)	0	0
Reclassification adjustments of (gains) losses into income	7.4	9.4
Tax benefit (provision)	(1.7)	(4)
Net change	5.7	5.4
Income tax reclassification adjustment		(103.6)
Ending balance	(647.8)	(601.5)
Accumulated Other Comprehensive Loss
Beginning balance	(651)	(484.6)		$ (484.6)
Unrealized gains (losses)	(14.9)	14.5
Reclassification adjustments of (gains) losses into income	9.6	7.1
Tax benefit (provision)	(0.6)	(3.9)
Net change	(5.9)	17.7
Income tax reclassification adjustment		(85.9)
Ending balance	$ (656.9)	$ (552.8)
2018 Share Repurchase Program | Common Stock
Equity, Class of Treasury Stock [Line Items]
Authorized share repurchase program (in dollars)					$ 500
Total repurchased shares under this program (in shares)			2.7	0.6
Cost of common stock repurchased and retired (in dollars)			$ 63.3	$ 13.2
Remaining authorized repurchase amount (in dollars)			$ 436.7	$ 436.7

SEGMENT INFORMATION (Details 1)

SEGMENT INFORMATION (Details 1) - USD ($) $ in Millions	3 Months Ended		52 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019
Sales [Abstract]
Sales	$ 1,553.4	$ 1,710.3
Income (loss) before taxes:
Income (loss) before taxes	53.1	27.5
Corporate/Other:
Environmental expense	1.8	2.3
Restructuring charges	(4)	(4)	$ (186)
Acquisition-related costs	0	(0.3)
Other operating income	0.1	8.1
Interest expense	(57.4)	(63.7)
Interest income	0.2	0.4
Non-operating pension income	3.9	5.4
Other income	11.2	0
Gain in Other Operating (Expense) Income due to Insurance Recoveries		8
Chlor Alkali Products and Vinyls
Sales [Abstract]
Sales	872.2	936.1
Income (loss) before taxes:
Income (loss) before taxes	120.4	130.5
Epoxy
Sales [Abstract]
Sales	524	603.3
Income (loss) before taxes:
Income (loss) before taxes	10.5	(22.1)
Winchester
Sales [Abstract]
Sales	157.2	170.9
Income (loss) before taxes:
Income (loss) before taxes	9.1	12
Corporate/Other [Member]
Corporate/Other:
Environmental expense	1.8	2.3
Other corporate and unallocated costs	(39.1)	(36.5)
Restructuring charges	(4)	(4)
Acquisition-related costs	$ 0	$ (0.3)

SEGMENT INFORMATION (Details 2)

SEGMENT INFORMATION (Details 2) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Sales	$ 1,553.4	$ 1,710.3
United States
Disaggregation of Revenue [Line Items]
Sales	909.4	947.1
Europe [Member]
Disaggregation of Revenue [Line Items]
Sales	276.8	325.3
Other foreign [Member]
Disaggregation of Revenue [Line Items]
Sales	367.2	437.9
Chlor Alkali Products and Vinyls
Disaggregation of Revenue [Line Items]
Sales	872.2	936.1
Chlor Alkali Products and Vinyls | United States
Disaggregation of Revenue [Line Items]
Sales	604	608.1
Chlor Alkali Products and Vinyls | Europe [Member]
Disaggregation of Revenue [Line Items]
Sales	38.6	45.8
Chlor Alkali Products and Vinyls | Other foreign [Member]
Disaggregation of Revenue [Line Items]
Sales	229.6	282.2
Epoxy
Disaggregation of Revenue [Line Items]
Sales	524	603.3
Epoxy | United States
Disaggregation of Revenue [Line Items]
Sales	164.1	180.4
Epoxy | Europe [Member]
Disaggregation of Revenue [Line Items]
Sales	235.4	278.5
Epoxy | Other foreign [Member]
Disaggregation of Revenue [Line Items]
Sales	124.5	144.4
Winchester
Disaggregation of Revenue [Line Items]
Sales	157.2	170.9
Winchester | United States
Disaggregation of Revenue [Line Items]
Sales	141.3	158.6
Winchester | Europe [Member]
Disaggregation of Revenue [Line Items]
Sales	2.8	1
Winchester | Other foreign [Member]
Disaggregation of Revenue [Line Items]
Sales	$ 13.1	$ 11.3

SEGMENT INFORMATION (Details 3)

SEGMENT INFORMATION (Details 3) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Sales	$ 1,553.4	$ 1,710.3
Chlor Alkali Products and Vinyls
Disaggregation of Revenue [Line Items]
Sales	872.2	936.1
Chlor Alkali Products and Vinyls | Caustic soda [Member]
Disaggregation of Revenue [Line Items]
Sales	462.1	536.9
Chlor Alkali Products and Vinyls | Chlorine, chlorine-derivatives and other co-products [Member]
Disaggregation of Revenue [Line Items]
Sales	410.1	399.2
Epoxy
Disaggregation of Revenue [Line Items]
Sales	524	603.3
Epoxy | Aromatics and allylics [Member]
Disaggregation of Revenue [Line Items]
Sales	243.8	308.4
Epoxy | Epoxy resins [Member]
Disaggregation of Revenue [Line Items]
Sales	280.2	294.9
Winchester
Disaggregation of Revenue [Line Items]
Sales	157.2	170.9
Winchester | Commercial [Member]
Disaggregation of Revenue [Line Items]
Sales	106.4	111.2
Winchester | Military and law enforcement [Member]
Disaggregation of Revenue [Line Items]
Sales	$ 50.8	$ 59.7

STOCK-BASED COMPENSATION (Detai

STOCK-BASED COMPENSATION (Details 1) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-based compensation	$ 5.6	$ 6.5
Mark-to-market adjustments	1.3	(3.2)
Total expense	$ 6.9	$ 3.3

STOCK-BASED COMPENSATION (Det_2

STOCK-BASED COMPENSATION (Details 2) - $ / shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Dividend yield	3.05%	2.43%
Risk-free interest rate	2.51%	2.72%
Expected volatility	34.00%	32.00%
Expected life (years)	6 years	6 years
Weighted-average grant fair value (per option)	$ 6.76	$ 8.89
Weighted-average exercise price	$ 26.26	$ 32.94
Shares granted	1,575,900	927,000

DEBT DEBT (Details)

DEBT DEBT (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Sep. 30, 2017	Jan. 19, 2018	Mar. 09, 2017
Debt Instrument [Line Items]
Write-off of unamortized deferred debt issuance costs		$ 2.6
Payment of Financing and Stock Issuance Costs	$ 0	8.5	$ 8.5
2030 Notes
Debt Instrument [Line Items]
Proceeds from Issuance of Debt		550
Debt Instrument, Interest Rate, Stated Percentage				5.00%
$1,375.0 million Term Loan Facility
Debt Instrument [Line Items]
Repayments of Debt		$ 550
Amended Delayed-Draw Term Loan Facility, Maximum Borrowing Capacity					$ 1,375

CONTRIBUTING EMPLOYEE OWNERSH_2

CONTRIBUTING EMPLOYEE OWNERSHIP PLAN (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Defined Contribution Plan Disclosure [Line Items]
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 9.4	$ 8.6
Employer matching contributions to employee ownership plan	$ 3.9	$ 3.7
Minimum
Defined Contribution Plan Disclosure [Line Items]
Contribution To Individual Retirement Account Percentage Of Employees Eligible Compensation	5.00%
Maximum
Defined Contribution Plan Disclosure [Line Items]
Contribution To Individual Retirement Account Percentage Of Employees Eligible Compensation	7.50%

PENSION PLANS AND RETIREMENT _3

PENSION PLANS AND RETIREMENT BENEFITS (Details Textuals) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Foreign Plan | Qualified Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 0.1	$ 0.5

PENSION PLANS AND RETIREMENT _4

PENSION PLANS AND RETIREMENT BENEFITS (Details 1) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Pension Benefits
Service cost	$ 3.1	$ 2.7
Interest cost	23.6	21.6
Expected return on plans’ assets	(35.3)	(36.8)
Recognized actuarial loss	6.8	8.8
Net periodic benefit (income) cost	(1.8)	(3.7)
Other Postretirement Benefits
Service cost	0.3	0.3
Interest cost	0.4	0.4
Expected return on plans’ assets	0	0
Recognized actuarial loss	0.6	0.6
Net periodic benefit (income) cost	$ 1.3	$ 1.3

INCOME TAXES (Details 1)

INCOME TAXES (Details 1) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Effective Tax Rate, Discrete Items, net	$ 0.8	$ 0.8
Effective Tax Rate, Discrete Items, net Percent	23.00%	26.90%
Statutory federal tax rate	21.00%	21.00%
Impact on the effective tax rate, if recognized	$ 33.5	$ 35.9
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Balance at beginning of year	33.8	36.3
Increases for current year tax positions	0.6	0.5
Balance at end of period	34.4	$ 36.8
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	$ 14.7

INCOME TAXES (Details 2)

INCOME TAXES (Details 2)	3 Months Ended
	Mar. 31, 2019
United States | Internal Revenue Service (IRS) | Minimum
Income Tax Examination [Line Items]
Open Tax Year	2013
United States | Internal Revenue Service (IRS) | Maximum
Income Tax Examination [Line Items]
Open Tax Year	2018
United States | State and Local Jurisdiction | Minimum
Income Tax Examination [Line Items]
Open Tax Year	2006
United States | State and Local Jurisdiction | Maximum
Income Tax Examination [Line Items]
Open Tax Year	2018
Canada | Foreign Country | Minimum
Income Tax Examination [Line Items]
Open Tax Year	2012
Canada | Foreign Country | Maximum
Income Tax Examination [Line Items]
Open Tax Year	2018
Brazil | Foreign Country | Minimum
Income Tax Examination [Line Items]
Open Tax Year	2014
Brazil | Foreign Country | Maximum
Income Tax Examination [Line Items]
Open Tax Year	2018
Germany | Foreign Country | Minimum
Income Tax Examination [Line Items]
Open Tax Year	2015
Germany | Foreign Country | Maximum
Income Tax Examination [Line Items]
Open Tax Year	2018
China | Foreign Country | Minimum
Income Tax Examination [Line Items]
Open Tax Year	2014
China | Foreign Country | Maximum
Income Tax Examination [Line Items]
Open Tax Year	2018
The Netherlands | Foreign Country | Minimum
Income Tax Examination [Line Items]
Open Tax Year	2014
The Netherlands | Foreign Country | Maximum
Income Tax Examination [Line Items]
Open Tax Year	2018

DERIVATIVE FINANCIAL INSTRUME_3

DERIVATIVE FINANCIAL INSTRUMENTS (Details Textuals) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Oct. 31, 2016	Jun. 30, 2016
Derivative [Line Items]
Notional amount	$ 168.6	$ 128.4	$ 116.5
Derivative Liability, Fair Value, Gross Liability	33.8	41.1	37.6
Forward Contracts
Derivative [Line Items]
Notional amount	110.5	98	123.7
Forward Contracts Sell
Derivative [Line Items]
Notional amount	89.7	132.3	82.6
Commodity Contract
Derivative [Line Items]
Cash Flow Hedges Derivative Instruments at Fair Value, Net	5.4
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	4.6
Interest Rate Contract
Derivative [Line Items]
Cash Flow Hedges Derivative Instruments at Fair Value, Net	3.6
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	2.8
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	1.3	1.3
Fixed Interest Rate Swaps $1,100M (Tranche 1)
Derivative [Line Items]
Notional amount	1,100
Fixed Interest Rate Swaps $900M (Tranche 2)
Derivative [Line Items]
Notional amount	900
Fixed Interest Rate Swaps $400M (Tranche 3)
Derivative [Line Items]
Notional amount	400
Interest Rate Swaps Designated As Fair Value Hedges
Derivative [Line Items]
Notional amount	500	500	$ 500	$ 250	$ 250
Derivative Liability, Fair Value, Gross Liability	23.5
Amount of (Loss) Gain	$ 0.7	$ 0.2

DERIVATIVE FINANCIAL INSTRUME_4

DERIVATIVE FINANCIAL INSTRUMENTS (Details 1) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Derivative [Line Items]
Notional amount	$ 168.6	$ 116.5	$ 128.4
Natural Gas Commodity Forward Contracts
Derivative [Line Items]
Notional amount	75.7	58.4	68.9
Other Commodity Forward Contracts
Derivative [Line Items]
Notional amount	$ 92.9	$ 58.1	$ 59.5

DERIVATIVE FINANCIAL INSTRUME_5

DERIVATIVE FINANCIAL INSTRUMENTS (Details 2) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Derivatives, Fair Value [Line Items]
Asset derivatives	$ (8.6)	$ (6.4)	$ (19)
Liability derivatives	(33.8)	(37.6)	(41.1)
Other Current Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	(6.5)	(5.7)	(15)
Other Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	(2.1)	(0.7)	(4)
Accrued Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	(9.4)	(3.5)	(0.8)
Other Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	(24.4)	(34.1)	(40.3)
Interest Rate Contract | Designated as Hedging Instrument | Other Current Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	(3.6)	(5.3)	(8.5)
Interest Rate Contract | Designated as Hedging Instrument | Other Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	0	0	(3.7)
Commodity Contracts Losses | Designated as Hedging Instrument | Other Current Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	0.6	0	1.2
Commodity Contracts Losses | Designated as Hedging Instrument | Other Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	0.1	0.2	0.1
Commodity Contracts Losses | Designated as Hedging Instrument | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	(9.8)	(4.9)	(1)
Commodity Contracts Losses | Designated as Hedging Instrument | Other Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	(0.9)	(0.5)	0
Commodity Contracts Gains | Designated as Hedging Instrument | Other Current Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	(3.2)	0	(7.2)
Commodity Contracts Gains | Designated as Hedging Instrument | Other Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	(2.2)	(0.9)	(0.4)
Commodity Contracts Gains | Designated as Hedging Instrument | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	0.6	1.9	0.2
Commodity Contracts Gains | Designated as Hedging Instrument | Other Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	0	0.1	0
Foreign Exchange Contract | Not Designated as Hedging Instrument | Other Current Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	(0.6)	(0.9)	(1.1)
Foreign Exchange Contract | Not Designated as Hedging Instrument | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	0	0.1	0
Foreign Exchange Contract Loss | Not Designated as Hedging Instrument | Other Current Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	0.3	0.5	0.6
Foreign Exchange Contract Loss | Not Designated as Hedging Instrument | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	(0.2)	(0.6)	0
Interest Rate Contract Loss | Designated as Hedging Instrument | Other Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	$ (23.5)	$ (33.7)	$ (40.3)

DERIVATIVE FINANCIAL INSTRUME_6

DERIVATIVE FINANCIAL INSTRUMENTS (Details 3) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Recognized in other comprehensive income:	$ (6.6)	$ 2.1
Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Recognized in other comprehensive income:	(6.6)	2.1
Reclassified from accumulated other comprehensive loss into income:	(2.2)	2.3
Commodity Contract | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Recognized in other comprehensive income:	(6.2)	(1)
Commodity Contract | Cost of goods sold | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Reclassified from accumulated other comprehensive loss into income:	(3.5)	1
Interest Rate Swap | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Recognized in other comprehensive income:	(0.4)	3.1
Interest Rate Swap | Interest expense | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Reclassified from accumulated other comprehensive loss into income:	1.3	1.3
Interest Rate Swap | Interest expense | Fair Value Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) Gain	(0.7)	0.2
Foreign Exchange Contract | Selling and administration | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) Gain	$ (2.4)	$ 0.5

FAIR VALUE MEASUREMENTS (Detail

FAIR VALUE MEASUREMENTS (Details Textuals) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	$ 0	$ 0	$ 0

FAIR VALUE MEASUREMENTS (Deta_2

FAIR VALUE MEASUREMENTS (Details 1) - USD ($)	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	$ 8,600,000	$ 6,400,000	$ 19,000,000
Derivative Liability	33,800,000	37,600,000	41,100,000
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0	0	0
Derivative Liability	0	0	0
Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	8,600,000	6,400,000	19,000,000
Derivative Liability	33,800,000	37,600,000	41,100,000
Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0	0	0
Derivative Liability	0	0	0
Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	3,600,000	5,300,000	12,200,000
Derivative Liability	23,500,000	33,700,000	40,300,000
Interest Rate Swap | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0	0	0
Derivative Liability	0	0	0
Interest Rate Swap | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	3,600,000	5,300,000	12,200,000
Derivative Liability	23,500,000	33,700,000	40,300,000
Interest Rate Swap | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0	0	0
Derivative Liability	0	0	0
Commodity Contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	4,700,000	700,000	6,300,000
Derivative Liability	10,100,000	3,400,000	800,000
Commodity Contract | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0	0	0
Derivative Liability	0	0	0
Commodity Contract | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	4,700,000	700,000	6,300,000
Derivative Liability	10,100,000	3,400,000	800,000
Commodity Contract | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0	0	0
Derivative Liability	0	0	0
Foreign Exchange Contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	300,000	400,000	500,000
Derivative Liability	200,000	500,000
Foreign Exchange Contract | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0	0	0
Derivative Liability	0	0
Foreign Exchange Contract | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	300,000	400,000	500,000
Derivative Liability	200,000	500,000
Foreign Exchange Contract | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0	0	$ 0
Derivative Liability	$ 0	$ 0

FAIR VALUE MEASUREMENTS (Deta_3

FAIR VALUE MEASUREMENTS (Details 2) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Long-term Debt, Fair Value	$ 3,374.9	$ 3,290.2	$ 3,736.9
Notes Payable	3,193.3	3,230.3	3,535.4
Fair Value, Inputs, Level 1
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Long-term Debt, Fair Value	0	0	0
Fair Value, Inputs, Level 2
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Long-term Debt, Fair Value	3,221.9	3,137.2	3,583.9
Fair Value, Inputs, Level 3
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Long-term Debt, Fair Value	$ 153	$ 153	$ 153

SUPPLEMENTAL GUARANTOR FINANC_3

SUPPLEMENTAL GUARANTOR FINANCIAL INFORMATION (Balance Sheet) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Supplemental Guarantor Financial Information Balance Sheets [Line Items]
Cash and cash equivalents	$ 105.7	$ 178.8	$ 109.1	$ 218.4	$ 109.1	$ 218.4
Receivables, net	808.3	776.3	835.6
Receivables, net	0	0	0
Income taxes receivable	6.3	5.9	17.5
Inventories, net	717.5	711.4	675.6
Other current assets	46.7	35	61.2
Total current assets	1,684.5	1,707.4	1,699
Property, plant and equipment, net	3,433.5	3,482.1	3,539.4
Operating lease assets, net	275.1	0	0
Investment in subsidiaries	0	0	0
Deferred income taxes	31.7	26.3	39.4
Other assets	1,131.4	1,150.4	1,197
Long-term receivables—affiliates	0	0	0
Intangible assets, net	494.2	511.6	565.1
Goodwill	2,119.5	2,119.6	2,120.3	2,120
Total assets	9,169.9	8,997.4	9,160.2
Current installments of long-term debt	126.1	125.9	0.7
Accounts payable	637	636.5	698.2
Intercompany payables	0	0	0
Income taxes payable	13	22.6	16
Current operating lease liabilities	69.4	0	0
Accrued liabilities	294.4	333.3	256.1
Total current liabilities	1,139.9	1,118.3	971
Long-term debt	3,067.2	3,104.4	3,534.7
Operating lease liabilities	206	0	0
Accrued pension liability	660.2	674.3	628.7
Deferred income taxes	525.9	518.9	498.4
Long-term payables—affiliates	0	0	0
Other liabilities	733.1	749.3	764.3
Total liabilities	6,332.3	6,165.2	6,397.1
Commitments and contingencies
Common stock	164.9	165.3	167.2
Additional paid-in capital	2,239.2	2,247.4	2,285
Accumulated other comprehensive loss	(656.9)	(651)	(552.8)	(484.6)
Retained earnings	1,090.4	1,070.5	863.7
Total shareholders’ equity	2,837.6	2,832.2	2,763.1	$ 2,753.7
Total liabilities and shareholders’ equity	9,169.9	8,997.4	9,160.2
Parent Guarantor
Supplemental Guarantor Financial Information Balance Sheets [Line Items]
Cash and cash equivalents	6	92	3.6		3.6	57.1
Receivables, net	99	99.7	119.6
Receivables, net	0	0	0
Income taxes receivable	0.3	2.6	11.4
Inventories, net	172.3	161.4	160.2
Other current assets	235.7	220.2	223.7
Total current assets	513.3	575.9	518.5
Property, plant and equipment, net	674	651.4	551.8
Operating lease assets, net	48.9
Investment in subsidiaries	7,024.5	6,943.3	6,720.1
Deferred income taxes	3.2	7.3	43.7
Other assets	17	24.3	47.3
Long-term receivables—affiliates	0	0	0
Intangible assets, net	0.3	0.3	0.3
Goodwill	0	0	0
Total assets	8,281.2	8,202.5	7,881.7
Current installments of long-term debt	1.1	0.9	0.7
Accounts payable	75.8	90.1	62
Intercompany payables	2,664.7	2,558.2	2,191.7
Income taxes payable	3.7	3.9	2.3
Current operating lease liabilities	8
Accrued liabilities	138.3	150.3	115
Total current liabilities	2,891.6	2,803.4	2,371.7
Long-term debt	1,370.3	1,357.5	1,352.2
Operating lease liabilities	42
Accrued pension liability	427	439.1	391.4
Deferred income taxes	0	0	0
Long-term payables—affiliates	419.6	469.6	680
Other liabilities	293.1	300.7	323.3
Total liabilities	5,443.6	5,370.3	5,118.6
Common stock	164.9	165.3	167.2
Additional paid-in capital	2,239.2	2,247.4	2,285
Accumulated other comprehensive loss	(656.9)	(651)	(552.8)
Retained earnings	1,090.4	1,070.5	863.7
Total shareholders’ equity	2,837.6	2,832.2	2,763.1
Total liabilities and shareholders’ equity	8,281.2	8,202.5	7,881.7
Issuer
Supplemental Guarantor Financial Information Balance Sheets [Line Items]
Cash and cash equivalents	0	0	0		0	0
Receivables, net	0	0	0
Receivables, net	0	0	0
Income taxes receivable	0	0	0
Inventories, net	0	0	0
Other current assets	0	0	0
Total current assets	0	0	0
Property, plant and equipment, net	0	0	0
Operating lease assets, net	0
Investment in subsidiaries	4,339.5	4,286.9	4,114.5
Deferred income taxes	0	0	0
Other assets	0	0	0
Long-term receivables—affiliates	1,169.9	1,247.2	1,537.5
Intangible assets, net	0	0	0
Goodwill	966.3	966.3	966.3
Total assets	6,475.7	6,500.4	6,618.3
Current installments of long-term debt	0	0	0
Accounts payable	0	0	0
Intercompany payables	0	0	0
Income taxes payable	0	0	0
Current operating lease liabilities	0
Accrued liabilities	0	0	0
Total current liabilities	0	0	0
Long-term debt	1,696.9	1,746.9	1,952.2
Operating lease liabilities	0
Accrued pension liability	0	0	0
Deferred income taxes	6.1	6	4.1
Long-term payables—affiliates	0	0	0
Other liabilities	5.5	5.5	5.6
Total liabilities	1,708.5	1,758.4	1,961.9
Common stock	0	0	0
Additional paid-in capital	4,125.7	4,125.7	4,125.7
Accumulated other comprehensive loss	0	0	0
Retained earnings	641.5	616.3	530.7
Total shareholders’ equity	4,767.2	4,742	4,656.4
Total liabilities and shareholders’ equity	6,475.7	6,500.4	6,618.3
Subsidiary Non-Guarantor
Supplemental Guarantor Financial Information Balance Sheets [Line Items]
Cash and cash equivalents	99.7	86.8	105.5		105.5	161.3
Receivables, net	709.3	676.6	716
Receivables, net	2,664.7	2,558.2	2,191.7
Income taxes receivable	6	3.3	6.1
Inventories, net	545.2	550	515.4
Other current assets	3.5	1.8	7.3
Total current assets	4,028.4	3,876.7	3,542
Property, plant and equipment, net	2,759.5	2,830.7	2,987.6
Operating lease assets, net	226.2
Investment in subsidiaries	0	0	0
Deferred income taxes	31.9	27.4	42.5
Other assets	1,114.4	1,126.1	1,149.7
Long-term receivables—affiliates	0	0	0
Intangible assets, net	493.9	511.3	564.8
Goodwill	1,153.2	1,153.3	1,154
Total assets	9,807.5	9,525.5	9,440.6
Current installments of long-term debt	125	125	0
Accounts payable	566.8	549.4	639.7
Intercompany payables	0	0	0
Income taxes payable	9.3	18.7	13.7
Current operating lease liabilities	61.4
Accrued liabilities	345.9	367.5	308.7
Total current liabilities	1,108.4	1,060.6	962.1
Long-term debt	0	0	230.3
Operating lease liabilities	164
Accrued pension liability	233.2	235.2	237.3
Deferred income taxes	523.2	521.3	541.1
Long-term payables—affiliates	750.3	777.6	857.5
Other liabilities	434.5	443.1	435.4
Total liabilities	3,213.6	3,037.8	3,263.7
Common stock	14.6	14.6	14.6
Additional paid-in capital	4,808.2	4,808.2	4,808.2
Accumulated other comprehensive loss	(8.1)	(6.9)	(4.8)
Retained earnings	1,779.2	1,671.8	1,358.9
Total shareholders’ equity	6,593.9	6,487.7	6,176.9
Total liabilities and shareholders’ equity	9,807.5	9,525.5	9,440.6
Eliminations
Supplemental Guarantor Financial Information Balance Sheets [Line Items]
Cash and cash equivalents	0	0	0		$ 0	$ 0
Receivables, net	0	0	0
Receivables, net	(2,664.7)	(2,558.2)	(2,191.7)
Income taxes receivable	0	0	0
Inventories, net	0	0	0
Other current assets	(192.5)	(187)	(169.8)
Total current assets	(2,857.2)	(2,745.2)	(2,361.5)
Property, plant and equipment, net	0	0	0
Operating lease assets, net	0
Investment in subsidiaries	(11,364)	(11,230.2)	(10,834.6)
Deferred income taxes	(3.4)	(8.4)	(46.8)
Other assets	0	0	0
Long-term receivables—affiliates	(1,169.9)	(1,247.2)	(1,537.5)
Intangible assets, net	0	0	0
Goodwill	0	0	0
Total assets	(15,394.5)	(15,231)	(14,780.4)
Current installments of long-term debt	0	0	0
Accounts payable	(5.6)	(3)	(3.5)
Intercompany payables	(2,664.7)	(2,558.2)	(2,191.7)
Income taxes payable	0	0	0
Current operating lease liabilities	0
Accrued liabilities	(189.8)	(184.5)	(167.6)
Total current liabilities	(2,860.1)	(2,745.7)	(2,362.8)
Long-term debt	0	0	0
Operating lease liabilities	0
Accrued pension liability	0	0	0
Deferred income taxes	(3.4)	(8.4)	(46.8)
Long-term payables—affiliates	(1,169.9)	(1,247.2)	(1,537.5)
Other liabilities	0	0	0
Total liabilities	(4,033.4)	(4,001.3)	(3,947.1)
Common stock	(14.6)	(14.6)	(14.6)
Additional paid-in capital	(8,933.9)	(8,933.9)	(8,933.9)
Accumulated other comprehensive loss	8.1	6.9	4.8
Retained earnings	(2,420.7)	(2,288.1)	(1,889.6)
Total shareholders’ equity	(11,361.1)	(11,229.7)	(10,833.3)
Total liabilities and shareholders’ equity	$ (15,394.5)	$ (15,231)	$ (14,780.4)

SUPPLEMENTAL GUARANTOR FINANC_4

SUPPLEMENTAL GUARANTOR FINANCIAL INFORMATION (Statements of Operations) (Details) - USD ($) $ in Millions	3 Months Ended		52 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019
Supplemental Guarantor Financial Information Statement of Operations [Line Items]
Sales	$ 1,553.4	$ 1,710.3
Operating expenses:
Cost of goods sold	1,347.3	1,528.7
Selling and administration	107	100.5
Restructuring charges	4	4	$ 186
Acquisition-related costs	0	0.3
Other operating (loss) income	0.1	8.1
Operating (loss) income	(95.2)	(84.9)
Earnings of non-consolidated affiliates	0	0.5
Equity income in subsidiaries	0	0
Interest expense	57.4	63.7
Interest income	0.2	0.4
Non-operating pension income (expense)	3.9	5.4
Other income	11.2	0
Income before taxes	53.1	27.5
Income tax (benefit) provision	11.4	6.6
Net income	41.7	20.9
Parent Guarantor
Supplemental Guarantor Financial Information Statement of Operations [Line Items]
Sales	332.8	352.7
Operating expenses:
Cost of goods sold	304.1	312
Selling and administration	51.8	47.1
Restructuring charges	1.4	0
Acquisition-related costs	0	0.3
Other operating (loss) income	(2.1)	5.8
Operating (loss) income	26.6	0.9
Earnings of non-consolidated affiliates		0.5
Equity income in subsidiaries	62.6	28.4
Interest expense	17.4	17
Interest income	0.6	1
Non-operating pension income (expense)	5.4	6.7
Other income	11.2
Income before taxes	35.8	18.7
Income tax (benefit) provision	(5.9)	(2.2)
Net income	41.7	20.9
Issuer
Supplemental Guarantor Financial Information Statement of Operations [Line Items]
Sales	0	0
Operating expenses:
Cost of goods sold	0	0
Selling and administration	0	0
Restructuring charges	0	0
Acquisition-related costs	0	0
Other operating (loss) income	0	0
Operating (loss) income	0	0
Earnings of non-consolidated affiliates		0
Equity income in subsidiaries	52.6	22.2
Interest expense	36.1	41.3
Interest income	0	0
Non-operating pension income (expense)	0	0
Other income	0
Income before taxes	16.5	(19.1)
Income tax (benefit) provision	(8.7)	(9.9)
Net income	25.2	(9.2)
Subsidiary Non-Guarantor
Supplemental Guarantor Financial Information Statement of Operations [Line Items]
Sales	1,327.7	1,467
Operating expenses:
Cost of goods sold	1,150.3	1,326.1
Selling and administration	55.2	53.4
Restructuring charges	2.6	4
Acquisition-related costs	0	0
Other operating (loss) income	2.2	2.3
Operating (loss) income	(121.8)	(85.8)
Earnings of non-consolidated affiliates		0
Equity income in subsidiaries	0	0
Interest expense	5.2	6.9
Interest income	0.9	0.9
Non-operating pension income (expense)	(1.5)	(1.3)
Other income	0
Income before taxes	116	78.5
Income tax (benefit) provision	26	18.7
Net income	90	59.8
Eliminations
Supplemental Guarantor Financial Information Statement of Operations [Line Items]
Sales	(107.1)	(109.4)
Operating expenses:
Cost of goods sold	(107.1)	(109.4)
Selling and administration	0	0
Restructuring charges	0	0
Acquisition-related costs	0	0
Other operating (loss) income	0	0
Operating (loss) income	0	0
Earnings of non-consolidated affiliates		0
Equity income in subsidiaries	(115.2)	(50.6)
Interest expense	(1.3)	(1.5)
Interest income	(1.3)	(1.5)
Non-operating pension income (expense)	0	0
Other income	0
Income before taxes	(115.2)	(50.6)
Income tax (benefit) provision	0	0
Net income	$ (115.2)	$ (50.6)

SUPPLEMENTAL GUARANTOR FINANC_5

SUPPLEMENTAL GUARANTOR FINANCIAL INFORMATION (Statements of Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Supplemental Guarantor Financial Information Statements Of Comprehensive Income (Loss) [Line Items]
Net income (loss)	$ 41.7	$ 20.9
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments, net	(8.3)	12.4
Unrealized losses on derivative contracts, net	(3.3)	(0.1)
Amortization of prior service costs and actuarial losses, net	5.7	5.4
Total other comprehensive (loss) income, net of tax	(5.9)	17.7
Comprehensive income	35.8	38.6
Parent Guarantor
Supplemental Guarantor Financial Information Statements Of Comprehensive Income (Loss) [Line Items]
Net income (loss)	41.7	20.9
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments, net	0	0
Unrealized losses on derivative contracts, net	(3.3)	(0.1)
Amortization of prior service costs and actuarial losses, net	5.1	5.4
Total other comprehensive (loss) income, net of tax	1.8	5.3
Comprehensive income	43.5	26.2
Issuer
Supplemental Guarantor Financial Information Statements Of Comprehensive Income (Loss) [Line Items]
Net income (loss)	25.2	(9.2)
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments, net	0	0
Unrealized losses on derivative contracts, net	0	0
Amortization of prior service costs and actuarial losses, net	0	0
Total other comprehensive (loss) income, net of tax	0	0
Comprehensive income	25.2	(9.2)
Subsidiary Non-Guarantor
Supplemental Guarantor Financial Information Statements Of Comprehensive Income (Loss) [Line Items]
Net income (loss)	90	59.8
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments, net	(8.3)	12.4
Unrealized losses on derivative contracts, net	0	0
Amortization of prior service costs and actuarial losses, net	0.6	0
Total other comprehensive (loss) income, net of tax	(7.7)	12.4
Comprehensive income	82.3	72.2
Eliminations
Supplemental Guarantor Financial Information Statements Of Comprehensive Income (Loss) [Line Items]
Net income (loss)	(115.2)	(50.6)
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments, net	0	0
Unrealized losses on derivative contracts, net	0	0
Amortization of prior service costs and actuarial losses, net	0	0
Total other comprehensive (loss) income, net of tax	0	0
Comprehensive income	$ (115.2)	$ (50.6)

SUPPLEMENTAL GUARANTOR FINANC_6

SUPPLEMENTAL GUARANTOR FINANCIAL INFORMATION (Cash Flows) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Sep. 30, 2017
Supplemental Guarantor Financial Information Statements Of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities	$ 104.3	$ 80.9	$ 80.9
Capital expenditures	(102.2)	(89.5)	(89.5)
Proceeds from disposition of property, plant and equipment	0	0.1	0.1
Proceeds from disposition of non-consolidated affiliate	20
Net investing activities	(82.2)	(89.4)	(89.4)
Long-term debt:
Borrowings	0	550.3	550.3
Repayments	(50.2)	(609.9)	(609.9)
Common stock repurchased and retired	(13.2)	0
Stock options exercised	1.4	1	1
Dividends paid	(33)	(33.4)	(33.4)
Debt issuance costs	0	(8.5)	(8.5)
Intercompany financing activities	0		0
Net financing activities	(95)	(100.5)	(100.5)
Effect of exchange rate changes on cash and cash equivalents	(0.2)	(0.3)	(0.3)
Net decrease in cash and cash equivalents	(73.1)	(109.3)	(109.3)
Cash and cash equivalents, end of period	105.7	109.1	109.1
Cash and cash equivalents, beginning of period	178.8	218.4	218.4
Parent Guarantor
Supplemental Guarantor Financial Information Statements Of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities	39.7		69.3
Capital expenditures	(50.7)		(41.7)
Proceeds from disposition of property, plant and equipment			0
Proceeds from disposition of non-consolidated affiliate	20
Net investing activities	(30.7)		(41.7)
Long-term debt:
Borrowings			550
Repayments	(0.2)		(20.2)
Common stock repurchased and retired	(13.2)
Stock options exercised	1.4		1
Dividends paid	(33)		(33.4)
Debt issuance costs			(8.5)
Intercompany financing activities	(50)		(570)
Net financing activities	(95)		(81.1)
Effect of exchange rate changes on cash and cash equivalents	0		0
Net decrease in cash and cash equivalents	(86)		(53.5)
Cash and cash equivalents, end of period	6	3.6	3.6
Cash and cash equivalents, beginning of period	92		57.1
Issuer
Supplemental Guarantor Financial Information Statements Of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities	0		0
Capital expenditures	0		0
Proceeds from disposition of property, plant and equipment			0
Proceeds from disposition of non-consolidated affiliate	0
Net investing activities	0		0
Long-term debt:
Borrowings			0
Repayments	(50)		(570)
Common stock repurchased and retired	0
Stock options exercised	0		0
Dividends paid	0		0
Debt issuance costs			0
Intercompany financing activities	50		570
Net financing activities	0		0
Effect of exchange rate changes on cash and cash equivalents	0		0
Net decrease in cash and cash equivalents	0		0
Cash and cash equivalents, end of period	0	0	0
Cash and cash equivalents, beginning of period	0		0
Subsidiary Non-Guarantor
Supplemental Guarantor Financial Information Statements Of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities	64.6		11.6
Capital expenditures	(51.5)		(47.8)
Proceeds from disposition of property, plant and equipment			0.1
Proceeds from disposition of non-consolidated affiliate	0
Net investing activities	(51.5)		(47.7)
Long-term debt:
Borrowings			0.3
Repayments	0		(19.7)
Common stock repurchased and retired	0
Stock options exercised	0		0
Dividends paid	0		0
Debt issuance costs			0
Intercompany financing activities	0		0
Net financing activities	0		(19.4)
Effect of exchange rate changes on cash and cash equivalents	(0.2)		(0.3)
Net decrease in cash and cash equivalents	12.9		(55.8)
Cash and cash equivalents, end of period	99.7	105.5	105.5
Cash and cash equivalents, beginning of period	86.8		161.3
Eliminations
Supplemental Guarantor Financial Information Statements Of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities	0		0
Capital expenditures	0		0
Proceeds from disposition of property, plant and equipment			0
Proceeds from disposition of non-consolidated affiliate	0
Net investing activities	0		0
Long-term debt:
Borrowings			0
Repayments	0		0
Common stock repurchased and retired	0
Stock options exercised	0		0
Dividends paid	0		0
Debt issuance costs			0
Intercompany financing activities	0		0
Net financing activities	0		0
Effect of exchange rate changes on cash and cash equivalents	0		0
Net decrease in cash and cash equivalents	0		0
Cash and cash equivalents, end of period	0	$ 0	0
Cash and cash equivalents, beginning of period	$ 0		$ 0

SUPPLEMENTAL GUARANTOR FINANC_7

SUPPLEMENTAL GUARANTOR FINANCIAL INFORMATION (Detail Textuals) $ in Millions	Oct. 05, 2015USD ($)
2023 Notes
Business Acquisition [Line Items]
2023 Notes	$ 720
Debt Instrument, Interest Rate, Stated Percentage	9.75%
2025 Notes
Business Acquisition [Line Items]
2025 Notes	$ 500
Debt Instrument, Interest Rate, Stated Percentage	10.00%