8-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d)

OF THE SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): July 29, 2016

OLIN CORPORATION

(Exact name of registrant as specified in its charter)

Virginia	1-1070	13-1872319
(State or Other Jurisdiction of Incorporation)	(Commission File Number)	(IRS Employer Identification No.)

190 Carondelet Plaza, Suite 1530 Clayton, MO	63105
(Address of principal executive offices)	(Zip Code)

(314) 480-1400

(Registrant’s telephone number, including area code)

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

¨ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 8.01 Other Events.

Olin Corporation (“Olin” or the “Parent Guarantor”) is filing with this Current Report on Form 8-K (this “Current Report”) (i) the audited consolidated financial statements of Olin Corporation and subsidiaries as of December 31, 2015 and 2014 and for each of the years in the three-year period ended December 31, 2015 to include additional guarantor information in the note entitled “Supplemental Guarantor Financial Information,” and (ii) the unaudited consolidated financial statements of Olin Corporation and subsidiaries as of March 31, 2016 and 2015 and for the three-month periods ended March 31, 2016 and 2015 to include additional guarantor information in the note entitled “Supplemental Guarantor Financial Information.” Olin’s audited and unaudited consolidated financial statements and the notes related thereto are filed as Exhibit 99.1 and Exhibit 99.2 hereto, respectively, and are incorporated herein by reference.

As previously disclosed, in October 2015 Blue Cube Spinco Inc. (“Blue Cube” or the “Issuer”) issued in a private placement (i) $720 million aggregate principal amount of unregistered 9.75% Senior Notes due 2023 (the “Original 2023 Notes”) and (ii) $500 million aggregate principal amount of unregistered 10.00% Senior Notes due 2025 (the “Original 2025 Notes” and, together with the Original 2023 Notes, the “Original Notes”), in connection with the acquisition by Olin of the Dow Chlorine Products Business (the “DCP Business”) from The Dow Chemical Company (“TDCC”). The Issuer is a 100% owned subsidiary of the Parent Guarantor, and the Original Notes are fully and unconditionally guaranteed by the Parent Guarantor. In connection with the private placement of the Original Notes, the Issuer and the Parent Guarantor entered into a registration rights agreement relating to the Original Notes, pursuant to which the Issuer and Parent Guarantor are filing a Registration Statement on Form S-4 with the Securities and Exchange Commission (the “SEC”) to exchange the Original Notes of each series for new notes of such series (the “Exchange Notes”), with terms (including the guarantees by the Parent Guarantor) identical in all material respects to the terms of the Original Notes (except that the Exchange Notes will not contain terms with respect to transfer restrictions or any increase in annual interest rate) (the “Exchange Offer”). In connection with the Exchange Offer, the Parent Guarantor will be required, pursuant to Rule 3-10 of Regulation S-X, to include in its financial statements certain financial information with respect to the Issuer, the Parent Guarantor and non-guarantor subsidiaries of the Parent Guarantor.

The audited and unaudited consolidated financial statements of Olin and the notes related thereto have been updated to include the notes entitled “Supplemental Guarantor Financial Information” and to adjust historical balance sheet amounts to reflect the adoption of recent accounting pronouncements requiring debt issuance costs to be presented as a direct reduction from the carrying value of the related debt. All other information, including financial information, provided in each of Olin’s Form 10-K for the year ended December 31, 2015 (the “Form 10-K”), and Olin’s Form 10-Q for the quarterly period ended March 31, 2016 (the “Form 10-Q”), remains unchanged and this Current Report does not modify or update the disclosures in the Form 10-K or the Form 10-Q in any other way. This Current Report should be read in conjunction with the Form 10-K and the Form 10-Q.

Item 9.01 Financial Statements and Exhibits.

(a) Financial Statements of the DCP Business

The unaudited combined balance sheets of the DCP Business as of September 30, 2015 and 2014 and the unaudited combined statements of income (loss) and combined statements of cash flows of the DCP Business for the nine months ended September 30, 2015 and 2014, and the notes related thereto, are filed as Exhibit 99.3 hereto and are incorporated herein by reference.

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(b) Pro Forma Financial Information

The unaudited pro forma condensed combined statements of operations of Olin for the year ended December 31, 2015, and the accompanying notes thereto, are filed as Exhibit 99.4 hereto and are incorporated herein by reference.

(d) Exhibits

Exhibit No.	Description
23.1	Consent of KPMG LLP
99.1	Audited consolidated financial statements of Olin Corporation and subsidiaries as of December 31, 2015 and 2014 and for each of the years in the three-year period ended December 31, 2015
99.2	Unaudited consolidated financial statements of Olin Corporation and subsidiaries as of March 31, 2016 and 2015, and for the three-month periods ended March 31, 2016 and 2015
99.3	Unaudited combined balance sheets of the DCP Business as of September 30, 2015 and 2014 and the unaudited combined statements of income (loss) and combined statements of cash flows of the DCP Business for the nine months ended September 30, 2015 and 2014, and the notes related thereto
99.4	Unaudited pro forma condensed combined statements of operations of Olin for the year ended December 31, 2015, and the accompanying notes thereto
101.INS	XBRL Instance Document
101.SCH	XBRL Taxonomy Extension Schema Document
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document
101.LAB	XBRL Taxonomy Extension Label Linkbase Document
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

OLIN CORPORATION
By:	/s/ George H. Pain
Name:	George H. Pain
Title:	Senior Vice President, General Counsel and Secretary

Date: July 29, 2016

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EXHIBIT INDEX

Exhibit No.	Description
23.1	Consent of KPMG LLP
99.1	Audited consolidated financial statements of Olin Corporation and subsidiaries as of December 31, 2015 and 2014 and for each of the years in the three-year period ended December 31, 2015
99.2	Unaudited consolidated financial statements of Olin Corporation and subsidiaries as of March 31, 2016 and 2015 and for the three-month periods ended March 31, 2016 and 2015
99.3	Unaudited combined balance sheets of the DCP Business as of September 30, 2015 and 2014 and the unaudited combined statements of income (loss) and combined statements of cash flows of the DCP Business for the nine months ended September 30, 2015 and 2014, and the notes related thereto
99.4	Unaudited pro forma condensed combined statements of operations of Olin for the year ended December 31, 2015, and the accompanying notes thereto
101.INS	XBRL Instance Document
101.SCH	XBRL Taxonomy Extension Schema Document
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document
101.LAB	XBRL Taxonomy Extension Label Linkbase Document
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document

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EX-23.1

Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

The Board of Directors

Olin Corporation:

We consent to the incorporation by reference in Registration Statements Nos. 333-18619, 333-39305, 333-39303, 333-35818, 333-97759, 333-110135, 333-110136, 333-124483, 333-133731, 333-148918, 333-158799, 333-166288, 333-176432, 333-195500, 333-209534, and 333-211434 on Form S-8 of Olin Corporation of our report dated February 29, 2016, except for the “Supplemental Guarantor Financial Information” note, which is as of July 29, 2016, with respect to the consolidated balance sheets of Olin Corporation as of December 31, 2015 and 2014, and the related consolidated statements of operations, comprehensive income, shareholders’ equity, and cash flows for each of the years in the three-year period ended December 31, 2015 included herein.

/s/ KPMG LLP

St. Louis, Missouri

July 29, 2016

EX-99.1

Exhibit 99.1

Item 8. CONSOLIDATED FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

MANAGEMENT REPORT ON INTERNAL CONTROL OVER FINANCIAL REPORTING

The management of Olin Corporation is responsible for establishing and maintaining adequate internal control over financial reporting. Olin’s internal control system was designed to provide reasonable assurance to the company’s management and board of directors regarding the preparation and fair presentation of published financial statements.

All internal control systems, no matter how well designed, have inherent limitations. Therefore, even those systems determined to be effective can provide only reasonable assurance with respect to financial statement preparation and presentation, and may not prevent or detect all misstatements.

During the year ended December 31, 2015, we completed a series of transactions consummated on October 5, 2015 which resulted in the acquisition from The Dow Chemical Company (TDCC) of its U.S. Chlor Alkali and Vinyl, Global Chlorinated Organics and Global Epoxy businesses (collectively, the Acquired Business). In accordance with the SEC’s published guidance, management’s assessment of the effectiveness of internal control over financial reporting did not include consideration of the internal controls of the Acquired Business. The Acquired Business’s financial results are included in Olin’s consolidated financial statements and constituted total assets of $6,360.3 million as of December 31, 2015 and $802.6 million of sales for the year then ended.

The management of Olin Corporation has assessed the effectiveness of the company’s internal control over financial reporting as of December 31, 2015. In making this assessment, we used the criteria set forth by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) in Internal Control—Integrated Framework (2013) to guide our analysis and assessment. Based on our assessment as of December 31, 2015, the company’s internal control over financial reporting was effective based on those criteria.

Our independent registered public accountants, KPMG LLP, have audited and issued a report on our internal control over financial reporting, which appears in Olin’s Annual Report on Form 10-K as of and for the year ended December 31, 2015.

/s/ John E. Fischer

President and Chief Executive Officer

/s/ Todd A. Slater

Vice President and Chief Financial Officer

Report of Independent Registered Public Accounting Firm

The Board of Directors and Shareholders of Olin Corporation:

We have audited the accompanying consolidated balance sheets of Olin Corporation and subsidiaries as of December 31, 2015 and 2014, and the related consolidated statements of operations, comprehensive income, shareholders’ equity, and cash flows for each of the years in the three-year period ended December 31, 2015. These consolidated financial statements are the responsibility of Olin Corporation’s management. Our responsibility is to express an opinion on these consolidated financial statements based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of Olin Corporation and subsidiaries as of December 31, 2015 and 2014, and the results of its operations and its cash flows for each of the years in the three-year period ended December 31, 2015, in conformity with U.S. generally accepted accounting principles.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), Olin Corporation’s internal control over financial reporting as of December 31, 2015, based on criteria established in Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO), and our report dated February 29, 2016 expressed an unqualified opinion on the effectiveness of the Olin Corporation’s internal control over financial reporting.

Our report dated February 29, 2016, on the effectiveness of internal control over financial reporting as of December 31, 2015, contains an explanatory paragraph that states the U.S. Chlor Alkali and Vinyl, Global Chlorinated Organics, and Global Epoxy businesses acquired from The Dow Chemical Company (collectively, the Acquired Business) have been excluded from management’s assessment of the effectiveness of Olin Corporation’s internal control over financial reporting as of December 31, 2015; the Acquired Business’ internal control over financial reporting associated with total assets of $6,360.3 million and total sales of $802.6 million included in the consolidated financial statements of Olin Corporation as of and for the year ended December 31, 2015. Our audit of internal control over financial reporting of Olin Corporation also excluded an evaluation of the internal control over financial reporting of the Acquired Business.

/s/ KPMG LLP

February 29, 2016, except as it relates to the “Supplemental Guarantor Financial Information” note, as to which the date is July 29, 2016.

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CONSOLIDATED BALANCE SHEETS

December 31

(In millions, except per share data)

	2015			2014
Assets
Current assets:
Cash and cash equivalents	$	392.0		$	256.8
Receivables, net		783.4			263.1
Income taxes receivable		32.9			21.6
Inventories		685.2			210.1
Current deferred income taxes		—			54.2
Other current assets		39.9			10.3
Total current assets		1,933.4			816.1
Property, plant and equipment, net		3,953.4			931.0
Deferred income taxes		95.9			12.5
Other assets		454.6			59.0
Intangible assets, net		677.5			123.5
Goodwill		2,174.1			747.1
Total assets	$	9,288.9		$	2,689.2
Liabilities and Shareholders’ Equity
Current liabilities:
Current installments of long-term debt	$	205.0		$	16.4
Accounts payable		608.2			146.8
Income taxes payable		4.9			0.2
Accrued liabilities		328.1			214.3
Total current liabilities		1,146.2			377.7
Long-term debt		3,643.8			649.8
Accrued pension liability		648.9			182.0
Deferred income taxes		1,095.2			107.1
Other liabilities		336.0			359.3
Total liabilities		6,870.1			1,675.9
Commitments and contingencies
Shareholders’ equity:
Common stock, par value $1 per share:
Authorized, 240.0 shares (120.0 in 2014);
Issued and outstanding, 165.1 shares (77.4 in 2014)		165.1			77.4
Additional paid-in capital		2,236.4			788.3
Accumulated other comprehensive loss		(492.5	)		(443.1	)
Retained earnings		509.8			590.7
Total shareholders’ equity		2,418.8			1,013.3
Total liabilities and shareholders’ equity	$	9,288.9		$	2,689.2

The accompanying notes to consolidated financial statements are an integral part of the consolidated financial statements.

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CONSOLIDATED STATEMENTS OF OPERATIONS

Years ended December 31

(In millions, except per share data)

	2015			2014		2013
Sales	$	2,854.4		$	2,241.2	$	2,515.0
Operating expenses:
Cost of goods sold		2,486.8			1,853.2		2,033.7
Selling and administration		186.5			166.2		190.0
Restructuring charges		2.7			15.7		5.5
Acquisition-related costs		123.4			4.2		—
Other operating income		45.7			1.5		0.7
Operating income		100.7			203.4		286.5
Earnings of non-consolidated affiliates		1.7			1.7		2.8
Interest expense		97.0			43.8		38.6
Interest income		1.1			1.3		0.6
Other income (expense)		0.2			0.1		(1.3	)
Income from continuing operations before taxes		6.7			162.7		250.0
Income tax provision		8.1			57.7		71.4
Income (loss) from continuing operations		(1.4	)		105.0		178.6
Income from discontinued operations, net		—			0.7		—
Net (loss) income	$	(1.4	)	$	105.7	$	178.6
Net (loss) income per common share:
Basic (loss) income per common share:
Income (loss) from continuing operations	$	(0.01	)	$	1.33	$	2.24
Income from discontinued operations, net		—			0.01		—
Net (loss) income	$	(0.01	)	$	1.34	$	2.24
Diluted (loss) income per common share:
Income (loss) from continuing operations	$	(0.01	)	$	1.32	$	2.21
Income from discontinued operations, net		—			0.01		—
Net (loss) income	$	(0.01	)	$	1.33	$	2.21
Average common shares outstanding:
Basic		103.4			78.6		79.9
Diluted		103.4			79.7		80.9

The accompanying notes to consolidated financial statements are an integral part of the consolidated financial statements.

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

Years ended December 31

(In millions)

	2015			2014			2013
Net (loss) income	$	(1.4	)	$	105.7		$	178.6
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments, net		(9.8	)		(1.8	)		(2.6	)
Unrealized losses on derivative contracts, net		(2.7	)		(5.1	)		(3.8	)
Pension and postretirement liability adjustments, net		(78.8	)		(86.6	)		(7.7	)
Amortization of prior service costs and actuarial losses, net		41.9			15.5			20.3
Total other comprehensive (loss) income, net of tax		(49.4	)		(78.0	)		6.2
Comprehensive (loss) income	$	(50.8	)	$	27.7		$	184.8

The accompanying notes to consolidated financial statements are an integral part of the consolidated financial statements.

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CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY

(In millions, except per share data)

	Common Stock						Additional			Accumulated Other						Total
	Shares Issued			Par Value			Paid-In Capital			Comprehensive Loss			Retained Earnings			Shareholders’ Equity
Balance at January 1, 2013		80.2		$	80.2		$	856.1		$	(371.3	)	$	433.4		$	998.4
Net income		—			—			—			—			178.6			178.6
Other comprehensive income		—			—			—			6.2			—			6.2
Dividends paid:
Common stock ($0.80 per share)		—			—			—			—			(64.0	)		(64.0	)
Common stock repurchased and retired		(1.5	)		(1.5	)		(34.7	)		—			—			(36.2	)
Common stock issued for:
Stock options exercised		0.5			0.5			9.2			—			—			9.7
Other transactions		0.2			0.2			3.0			—			—			3.2
Stock-based compensation		—			—			5.2			—			—			5.2
Balance at December 31, 2013		79.4			79.4			838.8			(365.1	)		548.0			1,101.1
Net income		—			—			—			—			105.7			105.7
Other comprehensive loss		—			—			—			(78.0	)		—			(78.0	)
Dividends paid:
Common stock ($0.80 per share)		—			—			—			—			(63.0	)		(63.0	)
Common stock repurchased and retired		(2.5	)		(2.5	)		(62.3	)		—			—			(64.8	)
Common stock issued for:
Stock options exercised		0.5			0.5			11.6			—			—			12.1
Other transactions		—			—			(1.4	)		—			—			(1.4	)
Stock-based compensation		—			—			1.6			—			—			1.6
Balance at December 31, 2014		77.4			77.4			788.3			(443.1	)		590.7			1,013.3
Net loss		—			—			—			—			(1.4	)		(1.4	)
Other comprehensive loss		—			—			—			(49.4	)		—			(49.4	)
Dividends paid:
Common stock ($0.80 per share)		—			—			—			—			(79.5	)		(79.5	)
Common stock issued for:
Stock options exercised		0.1			0.1			3.0			—			—			3.1
Other transactions		0.1			0.1			2.2			—			—			2.3
Business acquired in purchase transaction, net of issuance costs		87.5			87.5			1,438.0			—			—			1,525.5
Stock-based compensation		—			—			4.9			—			—			4.9
Balance at December 31, 2015		165.1		$	165.1		$	2,236.4		$	(492.5	)	$	509.8		$	2,418.8

The accompanying notes to consolidated financial statements are an integral part of the consolidated financial statements.

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CONSOLIDATED STATEMENTS OF CASH FLOWS

Years ended December 31

(In millions)

	2015			2014			2013
Operating Activities
Net (loss) income	$	(1.4	)	$	105.7		$	178.6
Adjustments to reconcile net (loss) income to net cash and cash equivalents provided by (used for) operating activities:
Earnings of non-consolidated affiliates		(1.7	)		(1.7	)		(2.8	)
Gain on disposition of non-consolidated affiliate		—			—			(6.5	)
Gains on disposition of property, plant and equipment		(25.2	)		(1.1	)		(0.4	)
Stock-based compensation		7.6			5.1			8.8
Depreciation and amortization		228.9			139.1			135.3
Deferred income taxes		5.6			31.0			12.4
Write-off of equipment and facility included in restructuring charges		0.5			3.3			—
Qualified pension plan contributions		(0.9	)		(0.8	)		(1.0	)
Qualified pension plan income		(32.0	)		(28.5	)		(24.1	)
Change in assets and liabilities:
Receivables		(115.1	)		25.8			18.9
Income taxes receivable/payable		(12.6	)		(27.8	)		0.4
Inventories		(1.7	)		(23.6	)		8.6
Other current assets		(30.6	)		1.7			0.7
Accounts payable and accrued liabilities		185.1			(38.5	)		1.0
Other assets		37.6			5.2			1.3
Other noncurrent liabilities		(32.5	)		(33.2	)		(14.5	)
Other operating activities		5.5			(2.5	)		0.3
Net operating activities		217.1			159.2			317.0
Investing Activities
Capital expenditures		(130.9	)		(71.8	)		(90.8	)
Business acquired and related transactions, net of cash acquired		(408.1	)		—			—
Proceeds from sale/leaseback of equipment		—			—			35.8
Proceeds from disposition of property, plant and equipment		26.2			5.6			4.6
Distributions from affiliated companies, net		8.8			—			1.5
Restricted cash activity, net		—			4.2			7.7
Other investing activities		—			0.3			(2.6	)
Net investing activities		(504.0	)		(61.7	)		(43.8	)
Financing Activities
Long-term debt:
Borrowings		1,275.0			150.0			—
Repayments		(730.7	)		(162.4	)		(23.7	)
Earn out payment - SunBelt		—			(14.8	)		(17.1	)
Common stock repurchased and retired		—			(64.8	)		(36.2	)
Stock options exercised		2.2			6.6			8.8
Excess tax benefits from stock-based compensation		0.4			1.1			1.6
Dividends paid		(79.5	)		(63.0	)		(64.0	)
Debt and equity issuance costs		(45.2	)		(1.2	)		—
Net financing activities		422.2			(148.5	)		(130.6	)
Effect of exchange rate changes on cash and cash equivalents		(0.1	)		—			—
Net increase (decrease) in cash and cash equivalents		135.2			(51.0	)		142.6
Cash and cash equivalents, beginning of year		256.8			307.8			165.2
Cash and cash equivalents, end of year	$	392.0		$	256.8		$	307.8
Cash paid for interest and income taxes:
Interest	$	32.3		$	36.8		$	37.2
Income taxes, net of refunds	$	5.3		$	49.0		$	61.3

The accompanying notes to consolidated financial statements are an integral part of the consolidated financial statements.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

DESCRIPTION OF BUSINESS

Olin Corporation is a Virginia corporation, incorporated in 1892, having its principal executive offices in Clayton, MO. On October 5, 2015 (the Closing Date), we acquired from The Dow Chemical Company (TDCC) 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. For segment reporting purposes, a portion of the Acquired Business’s operating results comprise the newly created Epoxy segment with the remaining operating results combined with Olin’s Chlor Alkali Products and Chemical Distribution segments to comprise the newly created Chlor Alkali Products and Vinyls segment.

We are a manufacturer concentrated in three business segments: Chlor Alkali Products and Vinyls, Epoxy and Winchester. Chlor Alkali Products and Vinyls manufactures and sells chlorine and caustic soda, ethylene dichloride 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 and downstream products such as converted epoxy resins and additives. The Winchester segment products include sporting ammunition, reloading components, small caliber military ammunition and components, and industrial cartridges. See our discussion of our segment disclosures contained in Item 7—“Management’s Discussion and Analysis of Financial Condition and Results of Operations to Olin’s Annual Report on Form 10-K for the year ended December 31, 2015.”

ACCOUNTING POLICIES

The preparation of the consolidated financial statements requires estimates and assumptions that affect amounts reported and disclosed in the financial statements and related notes. Actual results could differ from those estimates.

Basis of Presentation

The consolidated financial statements include the accounts of Olin Corporation and all majority-owned subsidiaries. Investment in our affiliates are accounted for on the equity method. Accordingly, we include only our share of earnings or losses of these affiliates in consolidated net (loss) income. Certain reclassifications were made to prior year amounts to conform to the 2015 presentation.

Revenue Recognition

Revenues are recognized on sales of product at the time the goods are shipped and the risks of ownership have passed to the customer. Shipping and handling fees billed to customers are included in sales. Allowances for estimated returns, discounts and rebates are recognized when sales are recorded and are based on various market data, historical trends and information from customers. Actual returns, discounts and rebates have not been materially different from estimates.

Cost of Goods Sold and Selling and Administration Expenses

Cost of goods sold includes the costs of inventory sold, related purchasing, distribution and warehousing costs, costs incurred for shipping and handling, depreciation and amortization expense related to these activities and environmental remediation costs and recoveries.

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Selling and administration expenses include personnel costs associated with sales, marketing and administration, research and development, legal and legal-related costs, consulting and professional services fees, advertising expenses, depreciation expense related to these activities, foreign currency translation and other similar costs.

Other Operating Income

Other operating income consists of miscellaneous operating income items, which are related to our business activities, and (losses) gains on disposition of property, plant and equipment.

Included in other operating income were the following:

	Years Ended December 31,
	2015			2014		2013
	($ in millions)
(Losses) gains on disposition of property, plant and equipment, net	$	(0.6	)	$	0.2	$	(1.1	)
Gains on dispositions of former manufacturing facilities		—			—		1.5
Gains on insurance recoveries		46.0			—		—
Gain on resolution of a contract matter		—			1.0		—
Other		0.3			0.3		0.3
Other operating income	$	45.7		$	1.5	$	0.7

The gains on insurance recoveries in 2015 included insurance recoveries for property damage and business interruption of $42.3 million related to the portion of the Becancour, Canada chlor alkali facility that has been shut down since late June 2014 and $3.7 million related to the McIntosh, AL chlor alkali facility.

Other Income (Expense)

Other income (expense) consists of non-operating income items which are not related to our primary business activities. Other income (expense) in 2013 included $7.9 million of expense for our earn out liability from the acquisition of the remaining 50% of the SunBelt Chlor Alkali Partnership, which we refer to as SunBelt. Other income (expense) in 2013 also included a gain of $6.5 million on the sale of our equity interest in a bleach joint venture.

Foreign Currency Translation

Our worldwide operations utilize the U.S. dollar (USD) or local currency as the functional currency, where applicable. For foreign entities where the USD is the functional currency, gains and losses resulting from balance sheet translations are included in selling and administration. For foreign entities where the local currency is the functional currency, assets and liabilities denominated in local currencies are translated into USD at end-of-period exchange rates and the resultant translation adjustments are included in accumulated other comprehensive loss. Assets and liabilities denominated in other than the local currency are remeasured into the local currency prior to translation into USD and the resultant exchange gains or losses are included in income in the period in which they occur. Income and expenses are translated into USD using an approximation of the average rate prevailing during the period. We change the functional currency of our separate and distinct foreign entities only when significant changes in economic facts and circumstances indicate clearly that the functional currency has changed.

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Cash and Cash Equivalents

All highly liquid investments, with a maturity of three months or less at the date of purchase, are considered to be cash equivalents.

Short-Term Investments

We classify our marketable securities as available-for-sale, which are reported at fair market value with unrealized gains and losses included in accumulated other comprehensive loss, net of applicable taxes. The fair value of marketable securities is determined by quoted market prices. Realized gains and losses on sales of investments, as determined on the specific identification method, and declines in value of securities judged to be other-than-temporary are included in other income (expense) in the consolidated statements of operations. Interest and dividends on all securities are included in interest income and other income (expense), respectively.

Allowance for Doubtful Accounts Receivable

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.

Inventories

Inventories are valued at the lower of cost or market. For U.S. inventories, inventory costs are determined principally by the dollar value 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 include raw materials, direct labor and manufacturing overhead.

Property, Plant and Equipment

Property, plant and equipment are recorded at cost. Depreciation is computed on a straight-line basis over the estimated useful lives of the related assets. Interest costs incurred to finance expenditures for major long-term construction projects are capitalized as part of the historical cost and included in property, plant and equipment and are depreciated over the useful lives of the related assets. Leasehold improvements are amortized over the term of the lease or the estimated useful life of the improvement, whichever is shorter. Start-up costs are expensed as incurred. Expenditures for maintenance and repairs are charged to expense when incurred while the costs of significant improvements, which extend the useful life of the underlying asset, are capitalized.

Property, plant and equipment are reviewed for impairment when conditions indicate that the carrying values of the assets may not be recoverable. Such impairment conditions include an extended period of idleness or a plan of disposal. If such impairment indicators are present or other factors exist that indicate that the carrying amount of an asset may not be recoverable, we determine whether impairment has occurred through the use of an undiscounted cash flow analysis at the lowest level for which identifiable cash flows exist.

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For our Chlor Alkali Products and Vinyls, Epoxy and Winchester segments, the lowest level for which identifiable cash flows exist is the operating facility level or an appropriate grouping of operating facilities level. The amount of impairment loss, if any, is measured by the difference between the net book value of the assets and the estimated fair value of the related assets.

Restricted Cash

Restricted cash, which is restricted as to withdrawal or usage, is classified on our consolidated balance sheet as a noncurrent asset separately from cash and cash equivalents.

Asset Retirement Obligations

We record the fair value of an asset retirement obligation associated with the retirement of a tangible long-lived asset as a liability in the period incurred. The liability is measured at discounted fair value and is adjusted to its present value in subsequent periods as accretion expense is recorded. The corresponding asset retirement costs are capitalized as part of the carrying amount of the related long-lived asset and depreciated over the asset’s useful life. Asset retirement obligations are reviewed annually in the fourth quarter and/or when circumstances or other events indicate that changes underlying retirement assumptions may have occurred.

The activity of our asset retirement obligation was as follows:

	December 31,
	2015			2014
	($ in millions)
Beginning balance	$	54.4		$	60.8
Accretion		3.6			3.5
Spending		(8.2	)		(11.2	)
Currency translation adjustments		(1.1	)		(0.7	)
Acquisition activity		1.7			—
Adjustments		3.1			2.0
Ending balance	$	53.5		$	54.4

At December 31, 2015 and 2014, our consolidated balance sheets included an asset retirement obligation of $46.2 million and $44.2 million, respectively, which were classified as other noncurrent liabilities.

In 2015, we had net adjustments that increased the asset retirement obligation by $3.1 million, which were primarily comprised of increases in estimated costs for certain assets. In 2014, we had net adjustments that increased the asset retirement obligation by $2.0 million, which were primarily due to changes in the estimated timing of payments for certain assets.

Comprehensive Income (Loss)

Accumulated other comprehensive loss consists of foreign currency translation adjustments, pension and postretirement liability adjustments, pension and postretirement amortization of prior service costs and actuarial losses and net unrealized (losses) gains on derivative contracts.

Goodwill and Intangible Assets

Goodwill is not amortized, but is reviewed for impairment annually in the fourth quarter and/or when circumstances or other events indicate that impairment may have occurred. On January 1, 2012, we adopted Accounting Standards Update (ASU) 2011-08 “Testing Goodwill for Impairment” (ASU 2011-08) which permits entities to make a qualitative assessment of whether it is more likely than not that a reporting unit’s fair value is less than its carrying amount before applying the two-step goodwill impairment test.

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Circumstances that are considered as part of the qualitative assessment and could trigger the two-step impairment test include, but are not limited to: a significant adverse change in the business climate; a significant adverse legal judgment; adverse cash flow trends; an adverse action or assessment by a government agency; unanticipated competition; decline in our stock price; and a significant restructuring charge within a reporting unit. We define reporting units at the business segment level or one level below the business segment level. For purposes of testing goodwill for impairment, goodwill has been allocated to our reporting units to the extent it relates to each reporting unit. Based upon our qualitative assessment, it is more likely than not that the fair value of our reporting units are greater than their carrying value at December 31, 2015. No impairment charges were recorded for 2015, 2014 or 2013.

It is our practice, at a minimum, to perform a quantitative goodwill impairment test in the fourth quarter every three years. In the fourth quarter of 2014, we performed our triennial quantitative goodwill impairment test for our reporting units. We use a discounted cash flow approach to develop the estimated fair value of a reporting unit when a quantitative test is performed. Management judgment is required in developing the assumptions for the discounted cash flow model. We also corroborate our discounted cash flow analysis by evaluating a market-based approach that considers earnings before interest, taxes, depreciation and amortization (EBITDA) multiples from a representative sample of comparable public companies. As a further indicator that each reporting unit has been valued appropriately using a discounted cash flow model, the aggregate fair value of all reporting units is reconciled to the total market value of Olin. An impairment would be recorded if the carrying amount exceeded the estimated fair value.

The discount rate, profitability assumptions and terminal growth rate of our reporting units and the cyclical nature of the chlor alkali industry were the material assumptions utilized in the discounted cash flow model used to estimate the fair value of each reporting unit. The discount rate reflects a weighted-average cost of capital, which is calculated based on observable market data. Some of these data (such as the risk free or treasury rate and the pretax cost of debt) are based on the market data at a point in time. Other data (such as the equity risk premium) are based upon market data over time for a peer group of companies in the chemical manufacturing or distribution industries with a market capitalization premium added, as applicable.

The discounted cash flow analysis requires estimates, assumptions and judgments about future events. Our analysis uses our internally generated long-range plan. Our discounted cash flow analysis uses the assumptions in our long-range plan about terminal growth rates, forecasted capital expenditures and changes in future working capital requirements to determine the implied fair value of each reporting unit. The long-range plan reflects management judgment, supplemented by independent chemical industry analyses which provide multi-year industry operating and pricing forecasts.

We believe the assumptions used in our goodwill impairment analysis are appropriate and result in reasonable estimates of the implied fair value of each reporting unit. However, given the economic environment and the uncertainties regarding the impact on our business, there can be no assurance that our estimates and assumptions, made for purposes of our goodwill impairment testing will prove to be an accurate prediction of the future. If our assumptions regarding future performance are not achieved, we may be required to record goodwill impairment charges in future periods. It is not possible at this time to determine if any such future impairment charge would result or, if it does, whether such charge would be material.

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During 2012, we adopted ASU 2012-02 “Testing Indefinite Lived Intangible Assets for Impairment” (ASU 2012-02) which permits entities to make a qualitative assessment of whether it is more likely than not that an indefinite-lived intangible asset’s fair value is less than its carrying amount before performing a quantitative impairment test. Circumstances that are considered as part of the qualitative assessment and could trigger a quantitative impairment test include, but are not limited to: a significant adverse change in the business climate; a significant adverse legal judgment including asset specific factors; adverse cash flow trends; an adverse action or assessment by a government agency; unanticipated competition; decline in our stock price; and a significant restructuring charge within a reporting unit. Based upon our qualitative assessment, it is more likely than not that the fair value of our indefinite-lived intangible asset is greater than its carrying amount as of December 31, 2015. No impairment of our intangible assets were recorded in 2015, 2014 or 2013.

Other Assets

Included in other assets were the following:

	December 31,
	2015		2014
	($ in millions)
Investments in non-consolidated affiliates	$	25.0	$	23.3
Deferred debt issuance costs		3.3		1.4
Bleach joint venture receivable		—		7.8
Income tax receivable		1.5		6.6
Interest rate swaps		—		3.5
Supply contracts		406.5		—
Other		18.3		16.4
Other assets	$	454.6	$	59.0

In connection with the Acquisition, Olin and TDCC have agreed to enter into arrangements for the long-term supply of ethylene by TDCC to Olin, pursuant to which, among other things, Olin has made upfront payments of $433.5 million upon the Closing Date in order to receive ethylene at producer economics and for certain reservation fees for the option to obtain additional future ethylene supply at producer economics. The fair value of the long-term supply contracts recorded as of the Closing Date was a long-term asset of $410.8 million which will be amortized over the life of the contracts as ethylene is received. If the options are exercised by us, additional payments will be made to TDCC of between $230 million and $250 million on or about the fourth quarter of 2017 and between $425 million and $465 million on or about the fourth quarter of 2020, which will increase the value of the long-term asset. Amortization expense of $4.3 million was recognized within cost of goods sold in 2015 related to these supply contracts and is reflected in depreciation and amortization on the consolidated statements of cash flows. The long-term supply contracts are monitored for impairment each reporting period.

Environmental Liabilities and Expenditures

Accruals (charges to income) for environmental matters are recorded when it is probable that a liability has been incurred and the amount of the liability can be reasonably estimated, based upon current law and existing technologies. These amounts, which are not discounted and are exclusive of claims against third parties, are adjusted periodically as assessment and remediation efforts progress or additional technical or legal information becomes available. Environmental costs are capitalized if the costs increase the value of the property and/or mitigate or prevent contamination from future operations.

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Discontinued Operations

We present the results of operations, financial position and cash flows that have either been sold or that meet the criteria for “held for sale” accounting as discontinued operations. At the time an operation qualifies for held for sale accounting, the operation is evaluated to determine whether or not the carrying value exceeds its fair value less cost to sell. Any loss as a result of carrying value in excess of fair value less cost to sell is recorded in the period the operation meets held for sale accounting. Management judgment is required to assess the criteria required to meet held for sale accounting, and estimate fair value. Changes to the operation could cause it to no longer qualify for held for sale accounting and changes to fair value or adjustments to amounts previously reported as discontinued operations could result in an increase or decrease to previously recognized losses.

Income Taxes

Deferred taxes are provided for differences between the financial statement and tax bases of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. A valuation allowance is provided to offset deferred tax assets if, based on the available evidence, it is more likely than not that some or all of the value of the deferred tax assets will not be realized.

Derivative Financial Instruments

We are exposed to market risk in the normal course of our business operations due to our purchases of certain commodities, our ongoing investing and financing activities and our operations that use foreign currencies. The risk of loss can be assessed from the perspective of adverse changes in fair values, cash flows and future earnings. We have established policies and procedures governing our management of market risks and the use of financial instruments to manage exposure to such risks. We use hedge accounting treatment for substantially all of our business transactions whose risks are covered using derivative instruments. The hedge accounting treatment provides for the deferral of gains or losses on derivative instruments until such time as the related transactions occur.

Concentration of Credit Risk

Accounts receivable is the principal financial instrument which subjects us to a concentration of credit risk. Credit is extended based upon the evaluation of a customer’s financial condition and, generally, collateral is not required. Concentrations of credit risk with respect to receivables are somewhat limited due to our large number of customers, the diversity of these customers’ businesses and the geographic dispersion of such customers. Our accounts receivable are predominantly derived from sales denominated in USD or the Euro. We maintain an allowance for doubtful accounts based upon the expected collectibility of all trade receivables.

Fair Value

Fair value is defined as the price at which an asset could be exchanged in a current transaction between knowledgeable, willing parties or the amount that would be paid to transfer a liability to a new obligor, not the amount that would be paid to settle the liability with the creditor. Where available, fair value is based on observable market prices or parameters or derived from such prices or parameters. Where observable prices or inputs are not available, valuation models are applied. These valuation techniques involve some level of management estimation and judgment, the degree of which is dependent on the price transparency for the instruments or market and the instruments’ complexity.

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Assets and liabilities recorded at fair value in the consolidated balance sheets are categorized based upon the level of judgment associated with the inputs used to measure their fair value. Hierarchical levels, defined by Accounting Standards Codification (ASC) 820 “Fair Value Measurement” (ASC 820), and directly related to the amount of subjectivity associated with the inputs to fair valuation of these assets and liabilities, are as follows:

Level 1 — Inputs were unadjusted, quoted prices in active markets for identical assets or liabilities at the measurement date.

Level 2 — Inputs (other than quoted prices included in Level 1) were either directly or indirectly observable for the asset or liability through correlation with market data at the measurement date and for the duration of the instrument’s anticipated life.

Level 3 — Inputs reflected management’s best estimate of what market participants would use in pricing the asset or liability at the measurement date. Consideration was given to the risk inherent in the valuation technique and the risk inherent in the inputs to the model.

Retirement-Related Benefits

We account for our defined benefit pension plans and non-pension postretirement benefit plans using actuarial models required by ASC 715 “Compensation-Retirement Benefits” (ASC 715). These models use an attribution approach that generally spreads the financial impact of changes to the plan and actuarial assumptions over the average remaining service lives of the employees in the plan. Changes in liability due to changes in actuarial assumptions such as discount rate, rate of compensation increases and mortality, as well as annual deviations between what was assumed and what was experienced by the plan are treated as actuarial gains or losses. The principle underlying the required attribution approach is that employees render service over their average remaining service lives on a relatively smooth basis and, therefore, the accounting for benefits earned under the pension or non-pension postretirement benefits plans should follow the same relatively smooth pattern. Substantially all domestic defined benefit pension plan participants are no longer accruing benefits; therefore, actuarial gains and losses are amortized based upon the remaining life expectancy of the inactive plan participants. For the years ended December 31, 2015 and 2014, the average remaining life expectancy of the inactive participants in the defined benefit pension plan was 19 years and 18 years, respectively.

One of the key assumptions for the net periodic pension calculation is the expected long-term rate of return on plan assets, used to determine the “market-related value of assets.” The “market-related value of assets” recognizes differences between the plan’s actual return and expected return over a five year period. The required use of an expected long-term rate of return on the market-related value of plan assets may result in a recognized pension income that is greater or less than the actual returns of those plan assets in any given year. Over time, however, the expected long-term returns are designed to approximate the actual long-term returns and, therefore, result in a pattern of income and expense recognition that more closely matches the pattern of the services provided by the employees. As differences between actual and expected returns are recognized over five years, they subsequently generate gains and losses that are subject to amortization over the average remaining life expectancy of the inactive plan participants, as described in the preceding paragraph.

We use long-term historical actual return information, the mix of investments that comprise plan assets, and future estimates of long-term investment returns and inflation by reference to external sources to develop the expected long-term rate of return on plan assets as of December 31.

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The discount rate assumptions used for pension and non-pension postretirement benefit plan accounting reflect the rates available on high-quality fixed-income debt instruments on December 31 of each year. The rate of compensation increase is based upon our long-term plans for such increases. For retiree medical plan accounting, we review external data and our own historical trends for healthcare costs to determine the healthcare cost trend rates.

Stock-Based Compensation

We measure the cost of employee services received in exchange for an award of equity instruments, such as stock options, performance shares and restricted stock, based on the grant-date fair value of the award. This cost is recognized over the period during which an employee is required to provide service in exchange for the award, the requisite service period (usually the vesting period). An initial measurement is made of the cost of employee services received in exchange for an award of liability instruments based on its current fair value and the value of that award is subsequently remeasured at each reporting date through the settlement date. Changes in fair value of liability awards during the requisite service period are recognized as compensation cost over that period.

The fair value of each option granted, which typically vests ratably over three years, but not less than one year, was estimated on the date of grant, using the Black-Scholes option-pricing model with the following assumptions:

	2015			2014			2013
Dividend yield		2.92	%		3.13	%		3.44	%
Risk-free interest rate		1.69	%		2.13	%		1.35	%
Expected volatility		34	%		42	%		43	%
Expected life (years)		6.0			7.0			7.0
Weighted-average grant fair value (per option)	$	6.80		$	8.34		$	7.05
Weighted-average exercise price	$	27.40		$	25.69		$	23.28
Shares granted		776,750			624,200			621,000

Dividend yield was based on a historical average. Risk-free interest rate was based on zero coupon U.S. Treasury securities rates for the expected life of the options. Expected volatility was based on our historical stock price movements, as we believe that historical experience is the best available indicator of the expected volatility. Expected life of the option grant was based on historical exercise and cancellation patterns, as we believe that historical experience is the best estimate for future exercise patterns.

RECENT ACCOUNTING PRONOUNCEMENTS

In February 2016, the FASB issued ASU 2016-02 “Leases,” which supersedes ASC 840 “Leases” and creates a new topic, ASC 842 “Leases.” This update requires lessees to recognize a lease liability and a lease asset for all leases, including operating leases, with a term greater than 12 months on its balance sheet. The update also expands the required quantitative and qualitative disclosures surrounding leases. This update is effective for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years, with earlier application permitted. This update will be applied using a modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. We are currently evaluating the effect of this update on our consolidated financial statements.

In November 2015, the FASB issued ASU 2015-17 “Balance Sheet Classification of Deferred Taxes” (ASU 2015-17), which amends ASC 740 “Income Taxes” (ASC 740). This update requires deferred income tax liabilities and assets, and any related valuation allowance, to be classified as noncurrent on the balance sheet.

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This update simplified the current guidance requiring the deferred taxes for each jurisdiction to be presented as a net current asset or liability and net noncurrent asset or liability. This update is effective for fiscal years beginning after December 15, 2016 and interim periods within those fiscal years. The guidance may be applied either prospectively or retrospectively, with earlier application permitted. We adopted the provisions of ASU 2015-17 as of December 31, 2015, which was applied prospectively and therefore all prior periods have not been retrospectively adjusted.

In September 2015, the FASB issued ASU 2015-16 “Simplifying the Accounting for Measurement - Period Adjustments” which amends ASC 805 “Business Combinations.” This update requires that an acquirer in a business combination recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustments are determined. This update is effective for fiscal years beginning after December 15, 2015 and interim periods within those fiscal years. This update should be applied prospectively to adjustments of provisional amounts that occur after the effective date with earlier application permitted. The adoption of this standard could impact our consolidated financial statements as we finalize the preliminary purchase accounting for the Acquired Business.

In July 2015, the FASB issued ASU 2015-11 “Simplifying the Measurement of Inventory,” which amends ASC 330 “Inventory.” This update requires entities to measure inventory at the lower of cost and net realizable value. Net realizable value is the estimated selling prices in the ordinary course of business, less reasonable predictable costs of completion, disposal and transportation. This update simplifies the current guidance under which an entity must measure inventory at the lower of cost or market. This update does not impact inventory measured using LIFO. This update is effective for fiscal years beginning after December 15, 2016. This update will not have a material effect on our consolidated financial statements.

In April 2015, the FASB issued ASU 2015-03 “Simplifying the Presentation of Debt Issuance Costs” (ASU 2015-03) and, in August 2015, the FASB issued ASU 2015-15 “Interest-Imputation of Interest” (ASU 2015-15), which both amend ASC 835-30 “Interest-Imputation of Interest.” These updates require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability while debt issuance costs related to line-of-credit arrangements will continue to be presented as an asset. We adopted ASU 2015-03 and ASU 2015-15 on January 1, 2016 which required retrospective application. As of December 31, 2015 and December 31, 2014, debt issuance costs of $31.4 million and $8.9 million, respectively, were reclassified within our consolidated balance sheet from other assets to long-term debt and $1.5 million and zero, respectively, were reclassified within our consolidated balance sheet from other assets to current installments of long-term debt.

In May 2014, the FASB issued ASU 2014-09 “Revenue from Contracts with Customers,” which amends ASC 605 “Revenue Recognition” and creates a new topic, ASC 606 “Revenue from Contracts with Customers.” This update provides guidance on how an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. Upon initial application, the provisions of this update are required to be applied retrospectively to each prior reporting period presented or retrospectively with the cumulative effect of initially applying this update recognized at the date of initial application. This update also expands the disclosure requirements surrounding revenue recorded from contracts with customers. In August 2015, the FASB issued ASU 2015-14 “Revenue from Contracts with Customers” (ASU 2015-14), which amends ASC 606. This update defers the effective date of ASU 2014-09 for fiscal years, and interim periods within those years, beginning after December 15, 2017. We are currently evaluating the effect of this update on our financial statements and have not yet determined the method of initial application we will use.

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ACQUISITION

On the Closing Date, Olin consummated the previously announced merger (the Merger), using a Reverse Morris Trust structure, of our wholly owned subsidiary, Blue Cube Acquisition Corp. (Merger Sub), with and into Blue Cube Spinco Inc. (Spinco), with Spinco as the surviving corporation and a wholly owned subsidiary of Olin, as contemplated by the Agreement and Plan of Merger (the Merger Agreement) dated March 26, 2015, among Olin, TDCC, Merger Sub and Spinco (collectively, the Acquisition). Pursuant to the Merger Agreement and a Separation Agreement dated March 26, 2015 between TDCC and Spinco (the Separation Agreement), prior to the Merger, (1) TDCC transferred the Acquired Business to Spinco and (2) TDCC distributed Spinco’s stock to TDCC’s shareholders by way of a split-off (the Distribution). Upon consummation of the transactions contemplated by the Merger Agreement and the Separation Agreement (the Transactions), the shares of Spinco common stock then outstanding were automatically converted into the right to receive approximately 87.5 million shares of Olin common stock, which were issued by Olin on the Closing Date, and represented approximately 53% of the outstanding shares of Olin common stock, together with cash in lieu of fractional shares. Olin’s pre-Merger shareholders continued to hold the remaining approximately 47% of the outstanding shares of Olin common stock. On the Closing Date, Spinco became a wholly owned subsidiary of Olin.

The following table summarizes the aggregate purchase price for the Acquired Business and related transactions, subject to certain post-closing adjustments:

	October 5, 2015
	(In millions, except per share data)
Shares		87.5
Value of common stock on October 2, 2015		17.46
Equity consideration by exchange of shares	$	1,527.4
Cash and debt instruments received by TDCC		2,095.0
Accrual for future payments		90.2
Up-front payments under the ethylene agreements		433.5
Total cash, debt and equity consideration	$	4,146.1
Long-term debt assumed		569.0
Pension liabilities assumed		447.1
Aggregate purchase price	$	5,162.2

The value of the common stock was based on the closing stock price on the last trading day prior to the Closing Date.

In connection with the Acquisition, TDCC retained liabilities relating to the Acquired Business for litigation, releases of hazardous materials and violations of environmental law to the extent arising prior to the Closing Date.

During 2015, we incurred costs in connection with the Merger and related transactions, including $76.3 million of advisory, legal, accounting, integration and other professional fees and $30.5 million of financing-related fees. In addition, $47.1 million of costs were incurred as a result of the change in control which created a mandatory acceleration of expenses under deferred compensation plans as a result of the Transactions.

For segment reporting purposes, the Acquired Business’s Global Epoxy operating results comprise the newly created Epoxy segment and U.S. Chlor Alkali and Vinyl and Global Chlorinated Organics (Acquired Chlor Alkali Business) operating results combined with our former Chlor Alkali Products and Chemical Distribution segments to comprise the newly created Chlor Alkali Products and Vinyls segment.

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The Acquired Business’s results of operations have been included in our consolidated results for the period subsequent to the Closing Date. Our results for the year ended December 31, 2015 include Epoxy sales of $429.6 million and a segment loss of $7.5 million and Chlor Alkali Products and Vinyls include sales of the Acquired Chlor Alkali Business of $373.0 million and segment income of $37.2 million.

The Transactions have been accounted for using the acquisition method of accounting which requires, among other things, that assets acquired and liabilities assumed be recognized at their fair values as of the acquisition date. We are in the process of determining the fair values of the Acquired Business’s tangible and intangible assets and liabilities. Initial estimates of those fair values are included in these consolidated financial statements; however, the valuation process is not complete, and we expect that adjustments to the initial valuation will be required. The following table summarizes the preliminary allocation of the purchase price to the Acquired Business’s assets and liabilities:

	October 5, 2015
	($ in millions)
Total current assets	$	921.7
Property, plant and equipment		3,090.8
Deferred taxes		76.8
Intangible assets		582.3
Other assets		426.5
Total assets acquired		5,098.1
Total current liabilities		357.6
Long-term debt		517.9
Accrued pension liability		447.1
Deferred tax liability		1,054.9
Other liabilities		2.0
Total liabilities assumed		2,379.5
Net identifiable assets acquired		2,718.6
Goodwill		1,427.5
Fair value of net assets acquired	$	4,146.1

Included in total current assets are cash and cash equivalents of $25.4 million, inventories of $477.1 million and receivables of $418.9 million with a contracted value of $423.5 million. Included in total current liabilities are current installments of long-term debt of $51.1 million.

Based on preliminary valuations, purchase price was allocated to intangible assets as follows:

	October 5, 2015
	Weighted-Average Amortization Period	Gross Amount
		($ in millions)
Customers, customer contracts and relationships	15 Years	$	490.3
Acquired technology	7 Years		85.0
Trade name	Indefinite		7.0
Total acquired intangible assets		$	582.3

Based on preliminary valuations, $1,427.5 million was assigned to goodwill, none of which is deductible for tax purposes. The primary reasons for the Acquisition and the principal factors that contributed to the Acquired Business purchase price that resulted in the recognition of goodwill are due to the providing of increased production capacity and diversification of Olin’s product portfolio, cost-saving opportunities and enhanced size and geographic presence. The cost-saving opportunities include improved operating efficiencies and asset optimization.

19

Goodwill recorded in the Acquisition is not amortized but will be reviewed for impairment annually in the fourth quarter and/or when circumstances or other events indicate that impairment may have occurred.

Transaction financing

Prior to the Distribution, TDCC received from Spinco distributions of cash and debt instruments of Spinco with an aggregate value of $2,095.0 million (collectively, the Cash and Debt Distribution). On the Closing Date, Spinco 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) to TDCC. TDCC transferred the Notes to certain unaffiliated securityholders in satisfaction of existing debt obligations of TDCC held or acquired by those unaffiliated securityholders. On October 5, 2015, certain initial purchasers purchased the Notes from the unaffiliated securityholders. Interest on the Notes began accruing from October 1, 2015 and will be paid semi-annually beginning on April 15, 2016. The Notes are not redeemable at any time prior to October 15, 2020. Neither Olin nor Spinco received any proceeds from the sale of the Notes. Upon the consummation of the Transactions, Olin became guarantor of the Notes.

On June 23, 2015, Spinco entered into a new five-year delayed-draw term loan facility of up to $1,050.0 million. As of the Closing Date, Spinco drew $875.0 million to finance the cash portion of the Cash and Debt Distribution. Also on June 23, 2015, Olin and Spinco entered into a new five-year $1,850.0 million senior credit facility consisting of a $500.0 million senior revolving credit facility, which replaced Olin’s $265.0 million senior revolving credit facility at the closing of the Merger, and a $1,350.0 million (subject to reduction by the aggregate amount of the term loans funded to Spinco under the Spinco term loan facility) delayed-draw term loan facility. As of the Closing Date, an additional $475.0 million was drawn by Olin under this term loan facility which was used to pay fees and expenses of the Transactions, obtain additional funds for general corporate purposes and refinance Olin’s existing senior term loan facility due in 2019. Subsequent to the Closing Date, these senior credit facilities were consolidated into a single $1,850.0 million senior credit facility. This new senior credit facility will expire in 2020. The $500.0 million senior revolving credit facility includes a $100.0 million letter of credit subfacility. The term loan facility includes amortization payable in equal quarterly installments at a rate of 5.0% per annum for the first two years, increasing to 7.5% per annum for the following year and to 10.0% per annum for the last two years. Under the new senior credit facility, we may select various floating rate borrowing options. The actual interest rate paid on borrowings under the senior credit facility is based on a pricing grid which is dependent upon the leverage ratio as calculated under the terms of the facility for the prior fiscal quarter. The facility includes various customary restrictive covenants, including restrictions related to the ratio of debt to earnings before interest expense, taxes, depreciation and amortization (leverage ratio) and the ratio of earnings before interest expense, taxes, depreciation and amortization to interest expense (coverage ratio). Compliance with these covenants is determined quarterly based on the operating cash flows.

On August 25, 2015, Olin entered into a Credit Agreement (the Credit Agreement) with a syndicate of lenders and Sumitomo Mitsui Banking Corporation, as administrative agent, in connection with the Transactions. The Credit Agreement provides for a term credit facility (the Sumitomo Credit Facility) under which Olin obtained term loans in an aggregate amount of $600.0 million. On November 3, 2015, we entered into an amendment to the Sumitomo Credit Facility which increased the aggregate amount of term loans available by $200.0 million. On the Closing Date, $600.0 million of loans under the Credit Agreement were made available and borrowed upon and on November 5, 2015, $200.0 million of loans under the Credit Agreement were made available and borrowed upon.

20

The term loans under the Sumitomo Credit Facility will mature on October 5, 2018 and will have no scheduled amortization payments. The proceeds of the Sumitomo Credit Facility were used to refinance existing Spinco indebtedness outstanding at the Closing Date, to pay fees and expenses in connection with the Transactions and for general corporate purposes. The Credit Agreement contains customary representations, warranties and affirmative and negative covenants which are substantially similar to those included in the new $1,850.0 million senior credit facility.

On March 26, 2015, we and certain financial institutions executed commitment letters pursuant to which the financial institutions agreed to provide $3,354.5 million of financing to Spinco to finance the amount of the Cash and Debt Distribution and to provide financing, if needed, to Olin to refinance certain of our existing debt (the Bridge Financing), in each case on the terms and conditions set forth in the commitment letters. The Bridge Financing was not drawn on to facilitate the Transactions, and the commitments for the Bridge Financing have been terminated as of the Closing Date. For the year ended December 31, 2015, we paid debt issuance costs of $30.0 million associated with the Bridge Financing, which are included in interest expense.

Other acquisition-related transactions

In connection with the Transactions, certain additional agreements have been entered into, including, among others, an Employee Matters Agreement, a Tax Matters Agreement, site, transitional and other services agreements, supply and purchase agreements, real estate agreements, technology licenses and intellectual property agreements. Payments of approximately $90.2 million, subject to certain post-closing adjustments, will be made related to certain acquisition related liabilities including the estimated working capital adjustment.

In addition, Olin and TDCC have agreed to enter into arrangements for the long-term supply of ethylene by TDCC to Olin, pursuant to which, among other things, Olin has made upfront payments of $433.5 million upon the closing of the Merger in order to receive ethylene at producer economics and for certain reservation fees for the option to obtain additional future ethylene supply at producer economics. The fair value of the long-term supply contracts recorded as of the Closing Date was a long-term asset of $410.8 million which will be amortized over the life of the contracts as ethylene is received. If the options are exercised by us, additional payments will be made to TDCC of between $230 million and $250 million on or about the fourth quarter of 2017 and between $425 million and $465 million on or about the fourth quarter of 2020, which will increase the value of the long-term asset.

In connection with the Transactions and effective October 1, 2015, we filed a Certificate of Amendment to our Articles of Incorporation to increase the number of authorized shares of Olin common stock from 120.0 million shares to 240.0 million shares.

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Pro forma financial information

The following pro forma summary reflects consolidated results of operation as if the Acquisition had occurred on January 1, 2014 (unaudited).

	Years Ended December 31,
	2015			2014
	($ in millions, except per share data)
Sales	$	5,681.8		$	6,948.2
Net (loss) income		(36.4	)		2.4
Net (loss) income per common share:
Basic	$	(0.22	)	$	0.01
Diluted	$	(0.22	)	$	0.01

The pro forma financial information was prepared based on historical financial information and have been adjusted to give effect to pro forma adjustments that are (i) directly attributable to the Transactions, (ii) factually supportable and (iii) expected to have a continuing impact on the combined results. The pro forma statements of income use estimates and assumptions based on information available at the time. Management believes the estimates and assumptions to be reasonable; however, actual results may differ significantly from this pro forma financial information. The pro forma results presented do not include any anticipated synergies or other expected benefits that may be realized from the Transactions. The pro forma information is not intended to reflect the actual results that would have occurred had the companies actually been combined during the periods presented.

The pro forma results for the years ended December 31, 2015 and 2014 primarily include recurring adjustments for re-pricing of sales, raw materials and services to/from TDCC relating to arrangements for long-term supply agreements for the sale of raw materials, including ethylene and benzene, and services pursuant to the Separation Agreement, adjustments to eliminate historical sales between the Acquired Business and Olin, additional amortization expense related to the fair value of acquired identifiable intangible assets, additional depreciation expense related to the fair value adjustment to property, plant and equipment, interest expense related to the incremental debt issued in conjunction with the Acquisition and an adjustment to tax-effect the aforementioned pro forma adjustments using an estimated aggregate statutory income tax rate of the jurisdictions to which the above adjustments relate.

In addition to the above recurring adjustments, the pro forma results for the years ended December 31, 2015 and 2014 included non-recurring adjustments of $47.0 million and $4.2 million, respectively, relating to the elimination of transaction costs incurred that are directly related to the Transactions, and do not have a continuing impact on our combined operating results. The pro forma results for the year ended December 31, 2015 also included non-recurring adjustments of $47.1 million relating to the impact of costs incurred as a result of the change in control which created a mandatory acceleration of expenses under deferred compensation plans and $24.0 million related to additional costs of goods sold related to the increase of inventory to fair value at the acquisition date related to the preliminary purchase accounting for inventory.

RESTRUCTURING CHARGES

On December 12, 2014, we announced that we had made the decision to permanently close the portion of the Becancour, Canada chlor alkali facility that has been shut down since late June 2014. This action reduced the facility’s chlor alkali capacity by 185,000 tons. Subsequent to the shut down, the plant predominantly focuses on bleach and hydrochloric acid, which are value-added products, as well as caustic soda. In the fourth quarter of 2014, we recorded pretax restructuring charges of $10.0 million for the write-off of equipment and facility costs, employee severance and related benefit costs and lease and other contract termination costs related to these actions.

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For the year ended December 31, 2015, we recorded pretax restructuring charges of $2.0 million for the write-off of equipment and facility costs, lease and other contract termination costs and facility exit costs. We expect to incur additional restructuring charges through 2016 of approximately $4 million related to the shut down of this portion of the facility.

On December 9, 2010, our board of directors approved a plan to eliminate our use of mercury in the manufacture of chlor alkali products. Under the plan, the 260,000 tons of mercury cell capacity at our Charleston, TN facility was converted to 200,000 tons of membrane capacity capable of producing both potassium hydroxide and caustic soda. The board of directors also approved plans to reconfigure our Augusta, GA facility to manufacture bleach and distribute caustic soda, while discontinuing chlor alkali manufacturing at this site. The completion of these projects eliminated our chlor alkali production using mercury cell technology. For the years ended December 31, 2014 and 2013, we recorded pretax restructuring charges of $3.8 million and $3.7 million, respectively, for employee severance and related benefit costs, employee relocation costs, facility exit costs, write-off of equipment and facility costs and lease and other contract termination costs related to these actions.

On November 3, 2010, we announced that we made the decision to relocate the Winchester centerfire pistol and rifle ammunition manufacturing operations from East Alton, IL to Oxford, MS. This relocation, when completed, is forecast to reduce Winchester’s annual operating costs by approximately $35 million to $40 million. Consistent with this decision in 2010, we initiated an estimated $110 million five-year project, which includes approximately $80 million of capital spending. The capital spending was partially financed by $31 million of grants provided by the State of Mississippi and local governments. We currently expect to complete this relocation in the first half of 2016. For the years ended December 31, 2015, 2014 and 2013, we recorded pretax restructuring charges of $0.7 million, $1.9 million and $1.8 million, respectively, for employee severance and related benefit costs, employee relocation costs and facility exit costs related to these actions. We expect to incur additional restructuring charges through 2016 of approximately $1 million related to the transfer of these operations.

The following table summarizes the 2015, 2014 and 2013 activities by major component of these 2014 and 2010 restructuring actions and the remaining balances of accrued restructuring costs as of December 31, 2015:

	Employee severance and job related benefits			Lease and other contract termination costs			Employee relocation costs			Facility exit costs			Write-off of equipment and facility			Total
	($ in millions)
Balance January 1, 2013	$	13.5		$	0.4		$	—		$	—		$	—		$	13.9
2013 restructuring charges (credits)		0.4			(0.4	)		0.6			4.9			—			5.5
Amounts utilized		(3.7	)		—			(0.6	)		(4.9	)		—			(9.2	)
Balance at December 31, 2013		10.2			—			—			—			—			10.2
2014 restructuring charges		4.5			4.5			0.5			2.9			3.3			15.7
Amounts utilized		(3.5	)		—			(0.5	)		(2.9	)		(3.3	)		(10.2	)
Balance at December 31, 2014		11.2			4.5			—			—			—			15.7
2015 restructuring charges		—			0.7			0.6			0.9			0.5			2.7
Amounts utilized		(6.0	)		(2.9	)		(0.6	)		(0.9	)		(0.5	)		(10.9	)
Currency translation adjustments		(0.6	)		(0.2	)		—			—			—			(0.8	)
Balance at December 31, 2015	$	4.6		$	2.1		$	—		$	—		$	—		$	6.7

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The following table summarizes the cumulative restructuring charges of these 2014 and 2010 restructuring actions by major component through December 31, 2015:

	Chlor Alkali Products and Vinyls
	Becancour		Mercury		Winchester		Total
	($ in millions)
Write-off of equipment and facility	$	3.5	$	17.8	$	—	$	21.3
Employee severance and job related benefits		2.7		5.6		13.1		21.4
Facility exit costs		0.6		15.6		2.2		18.4
Pension and other postretirement benefits curtailment		—		—		4.1		4.1
Employee relocation costs		—		0.9		5.3		6.2
Lease and other contract termination costs		5.2		0.7		—		5.9
Total cumulative restructuring charges	$	12.0	$	40.6	$	24.7	$	77.3

As of December 31, 2015, we have incurred cash expenditures of $37.3 million and non-cash charges of $32.5 million related to these restructuring actions. The remaining balance of $6.7 million is expected to be paid out through 2016.

DISCONTINUED OPERATIONS

In 2007 we sold our Metals business, which was a reportable segment, and accordingly it was reported as a discontinued operation. Metals produced and distributed copper and copper alloy sheet, strip, foil, rod, welded tube, fabricated parts, and stainless steel and aluminum strip. In conjunction with the sale of the Metals business, we retained certain assets and liabilities.

During 2014, we made a payment of $5.5 million to resolve certain indemnity obligations related to the sale. As a result of the favorable resolution, we recognized a pretax gain of $4.6 million included in income from discontinued operations. The tax provision from discontinued operations included expense of $2.2 million for changes in tax contingencies related to the Metals sale. Income from discontinued operations, net consisted of the following:

	Years Ended December 31,
	2015		2014		2013
	($ in millions)
Income from discontinued operations	$	—	$	4.6	$	—
Tax provision		—		3.9		—
Income from discontinued operations, net	$	—	$	0.7	$	—

EARNINGS PER SHARE

Basic and diluted (loss) income per share are computed by dividing net (loss) income by the weighted-average number of common shares outstanding. Diluted net income per share reflects the dilutive effect of stock-based compensation.

	Years ended December 31,
	2015			2014		2013
	(In millions, except per share data)
Computation of Income (loss) per Share
Income (loss) from continuing operations, net	$	(1.4	)	$	105.0	$	178.6
Income from discontinued operations, net		—			0.7		—
Net (loss) income	$	(1.4	)	$	105.7	$	178.6
Basic shares		103.4			78.6		79.9
Basic (loss) income per share:
Income (loss) from continuing operations	$	(0.01	)	$	1.33	$	2.24
Income from discontinued operations, net		—			0.01		—

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	Years ended December 31,
	2015			2014		2013
Net (loss) income	$	(0.01	)	$	1.34	$	2.24
Diluted shares:
Basic shares		103.4			78.6		79.9
Stock-based compensation		—			1.1		1.0
Diluted shares		103.4			79.7		80.9
Diluted (loss) income per share:
Income (loss) from continuing operations	$	(0.01	)	$	1.32	$	2.21
Income from discontinued operations, net		—			0.01		—
Net (loss) income	$	(0.01	)	$	1.33	$	2.21

The computation of dilutive shares from stock-based compensation does not include 5.2 million shares in 2015 and 0.6 million shares in both 2014 and 2013 as their effect would have been anti-dilutive.

ALLOWANCE FOR DOUBTFUL ACCOUNTS RECEIVABLES

Allowance for doubtful accounts receivable consisted of the following:

	December 31,
	2015			2014
	($ in millions)
Beginning balance	$	3.0		$	3.4
Provisions charged		5.2			0.2
Write-offs, net of recoveries		(1.8	)		(0.6	)
Ending balance	$	6.4		$	3.0

At December 31, 2015 and 2014, our consolidated balance sheets included other receivables of $71.1 million and $21.2 million, respectively, which were classified as receivables, net.

INVENTORIES

	December 31,
	2015			2014
	($ in millions)
Supplies	$	86.5		$	39.2
Raw materials		91.5			63.3
Work in process		105.8			31.8
Finished goods		445.3			141.5
		729.1			275.8
LIFO reserves		(43.9	)		(65.7	)
Inventories, net	$	685.2		$	210.1

In conjunction with the Acquisition, we obtained inventories with a fair value of $477.1 million as of October 5, 2015. Inventories valued using the LIFO method comprised 49% and 58% of the total inventories at December 31, 2015 and 2014, respectively. The replacement cost of our inventories would have been approximately $43.9 million and $65.7 million higher than that reported at December 31, 2015 and 2014, respectively. During 2014 the reduction in LIFO inventory quantities resulted in LIFO inventory liquidation losses of $1.5 million.

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PROPERTY, PLANT AND EQUIPMENT

			December 31,
	Useful Lives		2015			2014
			($ in millions)
Land and improvements to land		10-20 Years	$	280.4		$	157.3
Buildings and building equipment		10-30 Years		380.4			212.1
Machinery and equipment		3-15 Years		4,665.8			1,846.1
Leasehold improvements				2.7			2.6
Construction in progress				123.5			43.6
Property, plant and equipment				5,452.8			2,261.7
Accumulated depreciation				(1,499.4	)		(1,330.7	)
Property, plant and equipment, net			$	3,953.4		$	931.0

In conjunction with the Acquisition, we obtained property, plant and equipment with a fair value of $3,090.8 million as of October 5, 2015.

The weighted-average useful life of machinery and equipment at December 31, 2015 was 12 years. Depreciation expense was $198.1 million, $124.5 million and $120.7 million for 2015, 2014 and 2013, respectively. Interest capitalized was $1.1 million, $0.2 million and $1.1 million for 2015, 2014 and 2013, respectively. Maintenance and repairs charged to operations amounted to $158.5 million, $125.0 million and $134.7 million in 2015, 2014 and 2013, respectively.

The consolidated statements of cash flows for the years ended December 31, 2015, 2014 and 2013, included a $(7.4) million, $(0.5) million and $7.9 million, respectively, (decrease) increase to capital expenditures, with the corresponding change to accounts payable and accrued liabilities, related to purchases of property, plant and equipment included in accounts payable at December 31, 2015, 2014 and 2013.

During 2013 we entered into sale/leaseback transactions for bleach trailers and chlorine, caustic soda and bleach railcars. We received proceeds from the sales of $35.8 million for the year ended December 31, 2013.

During 2015 assets of $1.4 million were acquired under capital leases and are included in machinery and equipment as of December 31, 2015.

INVESTMENTS—AFFILIATED COMPANIES

On November 16, 2007, we purchased for cash an $11.6 million equity interest in a bleach joint venture. As part of the investment we also entered into several commercial agreements, including agreements by which we would supply raw materials and services, and we would have marketing responsibility for bleach and caustic soda. During 2013, we sold our equity interest in the bleach joint venture which resulted in a gain of $6.5 million. As a result of the sale, as of December 31, 2015, we have recorded a receivable of $8.5 million which is included within other current assets on our consolidated balance sheet. During 2015, we received $8.8 million as a result of the sale.

We hold a 9.1% limited partnership interest in Bay Gas Storage Company, Ltd. (Bay Gas), an Alabama limited partnership, in which EnergySouth, Inc. (EnergySouth) is the general partner with interest of 90.9%. 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 to EnergySouth customers.

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The following table summarizes our investment in our non-consolidated equity affiliate:

	December 31,
	2015		2014
	($ in millions)
Bay Gas	$	25.0	$	23.3

The following table summarizes our equity earnings of non-consolidated affiliates:

	Years Ended December 31,
	2015		2014		2013
	($ in millions)
Bay Gas	$	1.7	$	1.7	$	2.1
Bleach joint venture		—		—		0.7
Equity earnings of non-consolidated affiliates	$	1.7	$	1.7	$	2.8

We received net distributions from our non-consolidated affiliates of zero, zero and $1.5 million for 2015, 2014 and 2013, respectively.

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, 2014	$	747.1		$	—		$	747.1
Acquisition activity		—			—			—
Balance at December 31, 2014		747.1			—			747.1
Acquisition activity		1,130.8			296.7			1,427.5
Foreign currency translation adjustment		(0.4	)		(0.1	)		(0.5	)
Balance at December 31, 2015	$	1,877.5		$	296.6		$	2,174.1

The increase in goodwill during 2015 was a result of the Acquisition and is based upon the preliminary valuation partially offset by the effects of foreign currency translation adjustments.

Intangible assets consisted of the following:

			December 31,
			2015							2014
	Useful Lives		Gross Amount		Accumulated Amortization			Net		Gross Amount		Accumulated Amortization			Net
			($ in millions)
Customers, customer contracts and relationships		(10-15 years)	$	641.0	$	(64.0	)	$	577.0	$	152.9	$	(41.0	)	$	111.9
Trade name		(indefinite)		17.9		—			17.9		10.9		—			10.9
Acquired technology		(7 years)		84.7		(2.7	)		82.0		—		—			—
Other		(4-10 years)		2.3		(1.7	)		0.6		2.3		(1.6	)		0.7
Total intangible assets			$	745.9	$	(68.4	)	$	677.5	$	166.1	$	(42.6	)	$	123.5

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In conjunction with the Acquisition, we obtained intangible assets with a fair value of $582.3 million as of October 5, 2015.

Amortization expense relating to intangible assets was $25.8 million in 2015 and $14.6 million in both 2014 and 2013. We estimate that amortization expense will be approximately $59.3 million in 2016 and approximately $59.2 million in 2017, 2018, 2019 and 2020. Intangible assets are reviewed for impairment annually in the fourth quarter and/or when circumstances or other events indicate that impairment may have occurred.

DEBT

Long-Term Debt

	December 31,
	2015			2014
	($ in millions)
Notes payable:
Variable-rate Senior Term Loan facility, due 2020 (2.17% at December 31, 2015)	$	1,350.0		$	—
Variable-rate Sumitomo credit facility, due 2018 (1.77% at December 31, 2015)		800.0			—
Variable-rate Recovery Zone bonds, due 2024-2035 (1.40% and 1.31% at December 31, 2015 and 2014, respectively)		103.0			103.0
Variable-rate Go Zone bonds, due 2024 (1.40% and 1.31% at December 31, 2015 and 2014, respectively)		50.0			50.0
Variable-rate Industrial development and environmental improvement obligations, due 2025 (0.27% and 0.20% at December 31, 2015 and 2014, respectively)		2.9			2.9
Variable-rate Senior Term Loan facility, due 2019 (1.66% at December 31, 2014)		—			149.1
9.75%, due 2023		720.0			—
10.00%, due 2025		500.0			—
5.50%, due 2022		200.0			200.0
6.75%, due 2016 (includes interest rate swaps of $1.2 million and $3.7 million in 2015 and 2014, respectively)		126.2			128.7
7.23%, SunBelt Notes due 2013-2017 (includes unamortized fair value premium of $0.2 million and $0.5 million and interest rate swaps of $0.4 million and $0.8 million in 2015 and 2014, respectively)		25.0			37.8
Capital lease obligations		4.6			3.6
Deferred debt issuance costs		(32.9	)		(8.9	)
Total debt		3,848.8			666.2
Amounts due within one year		205.0			16.4
Total long-term debt	$	3,643.8		$	649.8

On the Closing Date, Spinco issued $720.0 million aggregate principal 2023 Notes and $500.0 million aggregate principal 2025 Notes to TDCC. TDCC transferred the Notes to certain unaffiliated securityholders in satisfaction of existing debt obligations of TDCC held or acquired by those unaffiliated securityholders. On October 5, 2015, certain initial purchasers purchased the Notes from the unaffiliated securityholders. Interest on the Notes began accruing from October 1, 2015 and will be paid semi-annually beginning on April 15, 2016. The Notes are not redeemable at any time prior to October 15, 2020. Neither Olin nor Spinco received any proceeds from the sale of the Notes. Upon the consummation of the Transactions, Olin became guarantor of the Notes.

On June 23, 2015, Spinco entered into a new five-year delayed-draw term loan facility of up to $1,050.0 million. As of the Closing Date, Spinco drew $875.0 million to finance the cash portion of the Cash and Debt Distribution. Also on June 23, 2015, Olin and Spinco entered into a new five-year $1,850.0 million senior credit facility consisting of a $500.0 million senior revolving credit facility, which replaced Olin’s $265.0 million senior revolving credit facility at the closing of the Merger, and a $1,350.0 million (subject to reduction by the aggregate amount of the term loans funded to Spinco under the Spinco term loan facility) delayed-draw term loan facility. As of the Closing Date, an additional $475.0 million was drawn by Olin under this term loan facility which was used to pay fees and expenses of the Transactions, obtain additional funds for general corporate purposes and refinance Olin’s existing senior term loan facility due in 2019.

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Subsequent to the Closing Date, these senior credit facilities were consolidated into a single senior credit facility. This new senior credit facility will expire in 2020. The $500.0 million senior revolving credit facility includes a $100.0 million letter of credit subfacility. At December 31, 2015, we had $489.6 million available under our $500.0 million senior revolving credit facility because we had issued $10.4 million of letters of credit under the $100.0 million subfacility. The term loan facility includes amortization payable in equal quarterly installments at a rate of 5.0% per annum for the first two years, increasing to 7.5% per annum for the following year and to 10.0% per annum for the last two years. Under the new senior credit facility, we may select various floating rate borrowing options. The actual interest rate paid on borrowings under the senior credit facility is based on a pricing grid which is dependent upon the leverage ratio as calculated under the terms of the applicable facility for the prior fiscal quarter. The facility includes various customary restrictive covenants, including restrictions related to the ratio of debt to earnings before interest expense, taxes, depreciation and amortization (leverage ratio) and the ratio of earnings before interest expense, taxes, depreciation and amortization to interest expense (coverage ratio). Compliance with these covenants is determined quarterly based on the operating cash flows. We were in compliance with all covenants and restrictions under all our outstanding credit agreements as of December 31, 2015 and 2014, and no event of default had occurred that would permit the lenders under our outstanding credit agreements to accelerate the debt if not cured. In the future, our ability to generate sufficient operating cash flows, among other factors, will determine the amounts available to be borrowed under these facilities. As of December 31, 2015, there were no covenants or other restrictions that limited our ability to borrow.

On August 25, 2015, Olin entered into a Credit Agreement with a syndicate of lenders and Sumitomo Mitsui Banking Corporation, as administrative agent, in connection with the Transactions. Olin obtained term loans in an aggregate amount of $600.0 million under the Sumitomo Credit Facility. On November 3, 2015, we entered into an amendment to the Sumitomo Credit Facility which increased the aggregate amount of term loans available by $200.0 million. On the Closing Date, $600.0 million of loans under the Credit Agreement were made available and borrowed upon and on November 5, 2015, $200.0 million of loans under the Credit Agreement were made available and borrowed upon. The term loans under the Sumitomo Credit Facility will mature on October 5, 2018 and will have no scheduled amortization payments. The proceeds of the Sumitomo Credit Facility were used to refinance existing Spinco indebtedness outstanding at the Closing Date of $569.0 million, to pay fees and expenses in connection with the Transactions and for general corporate purposes. The Credit Agreement contains customary representations, warranties and affirmative and negative covenants which are substantially similar to those included in the new $1,850.0 million senior credit facility.

In 2015, we paid debt issuance costs of $13.3 million relating to the Notes, the Sumitomo Credit Facility and the new $1,850.0 million senior credit facility.

On March 26, 2015, we and certain financial institutions executed commitment letters pursuant to which the financial institutions agreed to provide $3,354.5 million of Bridge Financing, in each case on the terms and conditions set forth in the commitment letters. The Bridge Financing was not drawn on to facilitate the Acquisition and the commitments for the Bridge Financing have been terminated as of the Closing Date. For the year ended December 31, 2015, we paid debt issuance costs of $30.0 million associated with the Bridge Financing, which are included in interest expense.

In August 2014, we redeemed our $150.0 million 2019 Notes, which would have matured on August 15, 2019. We recognized interest expense of $9.5 million for the call premium ($6.7 million) and the write-off of unamortized deferred debt issuance costs ($2.1 million) and unamortized discount ($0.7 million) related to this action during 2014. On June 24, 2014, we entered into a five-year $415.0 million senior credit facility consisting of a $265.0 million senior revolving credit facility, which replaced our previous $265.0 million senior revolving credit facility, and a $150.0 million delayed-draw term loan facility.

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In August 2014, we drew the entire $150.0 million of the term loan and used the proceeds to redeem our 2019 Notes. In 2015 and 2014, we repaid $2.8 million and $0.9 million, respectively, under the required quarterly installments of the $150.0 million term loan facility and, on the Closing Date of the Acquisition, the remaining $146.3 million was refinanced using the proceeds of the new senior credit facility. We recognized interest expense of $0.5 million for the write-off of unamortized deferred debt issuance costs related to this action.

Pursuant to a note purchase agreement dated December 22, 1997, SunBelt sold $97.5 million of Guaranteed Senior Secured Notes due 2017, Series O, and $97.5 million of Guaranteed Senior Secured Notes due 2017, Series G. We refer to these notes as the SunBelt Notes. The SunBelt Notes bear interest at a rate of 7.23% per annum, payable semi-annually in arrears on each June 22 and December 22. Beginning on December 22, 2002 and each year through 2017, SunBelt is required to repay $12.2 million of the SunBelt Notes, of which $6.1 million is attributable to the Series O Notes and of which $6.1 million is attributable to the Series G Notes. In December 2015, 2014 and 2013, $12.2 million was repaid on these SunBelt Notes.

We have guaranteed the Series O Notes, and PolyOne, our former SunBelt partner, has guaranteed the Series G Notes, in both cases pursuant to customary guaranty agreements. We have agreed to indemnify PolyOne for any payments or other costs under the guarantee in favor of the purchasers of the Series G Notes, to the extent any payments or other costs arise from a default or other breach under the SunBelt Notes. If SunBelt does not make timely payments on the SunBelt Notes, whether as a result of a failure to pay on a guarantee or otherwise, the holders of the SunBelt Notes may proceed against the assets of SunBelt for repayment.

In January 2013, we repaid the $11.4 million 6.5% Senior Notes, which became due.

During 2015, assets of $1.4 million were acquired under capital leases with terms between 6 years and 7 years. During 2013, assets of $4.2 million were acquired under capital leases with terms of 7 years.

At December 31, 2015, we had total letters of credit of $27.6 million outstanding, of which $10.4 million were issued under our $500.0 million senior revolving credit facility. The letters of credit are used to support certain long-term debt, certain workers compensation insurance policies, certain plant closure and post-closure obligations and certain Canadian pension funding requirements.

Annual maturities of long-term debt, including capital lease obligations, are $206.5 million in 2016, $80.9 million in 2017, $901.9 million in 2018, $135.7 million in 2019, $980.3 million in 2020 and a total of $1,576.4 million thereafter.

We have entered into interest rate swaps, as disclosed below, whereby we agree to pay variable and fixed rates to a counterparty who, in turn, pays us fixed and variable rates. In all cases the underlying index for variable rates is the six-month LIBOR. Accordingly, payments are settled every six months and the terms of the swaps are the same as the underlying debt instruments.

The following table reflects the swap activity related to certain debt obligations:

Underlying Debt Instrument	Swap Amount		Date of Swap		December 31, 2015
	($ in millions)
					Olin Pays Floating Rate:
6.75%, due 2016	$	65.0		March 2010	3.75 - 4.75%(a)
6.75%, due 2016	$	60.0		March 2010	3.75 - 4.75%(a)
					Olin Receives Floating Rate:
6.75%, due 2016	$	65.0		October 2011	3.75 - 4.75%(a)
6.75%, due 2016	$	60.0		October 2011	3.75 - 4.75%(a)

(a) Actual rate is set in arrears. We project the rate will fall within the range shown.

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In March 2010, we entered into interest rate swaps on $125 million of our underlying fixed-rate debt obligations, whereby we agreed to pay variable rates to a counterparty who, in turn, pays us fixed rates. The counterparty to these agreements is Citibank, N.A. (Citibank). In October 2011, we entered into $125 million of interest rate swaps with equal and opposite terms as the $125 million variable interest rate swaps on the 2016 Notes. We have agreed to pay a fixed rate to a counterparty who, in turn, pays us variable rates. The counterparty to this agreement is also Citibank. The result was a gain of $11.0 million on the $125 million variable interest rate swaps, which will be recognized through 2016. As of December 31, 2015, $1.2 million of this gain was included in current installments of long-term debt. In October 2011, we de-designated our $125 million interest rate swaps that had previously been designated as fair value hedges. The $125 million variable interest rate swaps and the $125 million fixed interest rate swaps do not meet the criteria for hedge accounting. All changes in the fair value of these interest rate swaps are recorded currently in earnings.

In June 2012, we terminated $73.1 million of interest rate swaps with Wells Fargo, N.A. (Wells Fargo) that had been entered into on the SunBelt Notes in May 2011. The result was a gain of $2.2 million which will be recognized through 2017. As of December 31, 2015, $0.4 million of this gain was included in long-term debt.

Our loss in the event of nonperformance by these counterparties could be significant to our financial position and results of operations. These interest rate swaps reduced interest expense by $2.8 million in 2015 and $2.9 million in both 2014 and 2013. The difference between interest paid and interest received is included as an adjustment to interest expense.

PENSION PLANS

Most of our domestic employees participate in defined contribution pension plans. We provide a contribution to an individual retirement contribution account maintained with the Contributing Employee Ownership Plan (CEOP) equal to an amount of between 5% and 10% of the employee’s eligible compensation. The defined contribution pension plans expense was $18.1 million, $16.1 million and $15.4 million for 2015, 2014 and 2013, respectively.

A portion of our bargaining hourly employees continue to participate in our domestic defined benefit pension plans under a flat-benefit formula. Our funding policy for the 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 statutory practices. Our 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).

Effective as of the Closing Date, we changed the approach used to measure service and interest costs for our defined benefit pension plans. Prior to the Closing Date, we measured service and interest costs utilizing a single weighted-average discount rate derived from the yield curve used to measure the plan obligations. Subsequent to the Closing Date, we elected to measure service and interest costs by applying the specific spot rates along the yield curve to the plans’ estimated cash flows.

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We believe the new approach provides a more precise measurement of service and interest costs by aligning the timing of the plans’ liability cash flows to the corresponding spot rates on the yield curve. This change does not affect the measurement of our plan obligations. We have accounted for this change as a change in accounting estimate and, accordingly, have accounted for it on a prospective basis.

During the fourth quarter of 2014, the Society of Actuaries (SOA) issued the final report of its mortality tables and mortality improvement scales. The updated mortality data reflected increasing life expectancies in the U.S. During the third quarter of 2012, the “Moving Ahead for Progress in the 21st Century Act” (MAP-21) became law. The law changed the mechanism for determining interest rates to be used for calculating minimum defined benefit pension plan funding requirements. Interest rates are determined using an average of rates for a 25-year period, which can have the effect of increasing the annual discount rate, reducing the defined benefit pension plan obligation, and potentially reducing or eliminating the minimum annual funding requirement. The law also increased premiums paid to the PBGC. During the third quarter of 2014, the “Highway and Transportation Funding Act” (HATFA 2014) became law, which includes an extension of MAP-21’s defined benefit plan funding stabilization relief. Based on our plan assumptions and estimates, we will not be required to make any cash contributions to the domestic qualified defined benefit pension plan at least through 2016.

As of the Closing Date and as part of the Acquisition, our U.S. qualified defined benefit pension plan assumed certain U.S. qualified defined benefit pension obligations and assets related to active employees and certain terminated, vested retirees of the Acquired Business with an estimated net liability of $286.5 million, subject to certain post-closing adjustments. In connection therewith, pension assets will be transferred from TDCC’s U.S. qualified defined benefit pension plans to our U.S. qualified defined benefit pension plan. Immediately prior to the Acquisition, the Acquired Business’s participant accounts assumed in the Acquisition were closed to new participants and were no longer accruing additional benefits.

Also as of the Closing Date, we assumed certain accrued defined benefit pension liabilities relating to employees of TDCC in Germany, Switzerland and other international locations who transferred to Olin in connection with the Acquisition. The estimated net liability assumed as of the Closing Date was $160.6 million, subject to post-closing adjustments.

Pension Obligations and Funded Status

Changes in the benefit obligation and plan assets were as follows:

	December 31, 2015									December 31, 2014
	($ in millions)									($ in millions)
Change in Benefit Obligation	U.S.			Foreign			Total			U.S.			Foreign			Total
Benefit obligation at beginning of year	$	2,116.5		$	66.3		$	2,182.8		$	1,916.5		$	62.2		$	1,978.7
Service cost		2.1			2.2			4.3			2.3			0.5			2.8
Interest cost		80.2			3.1			83.3			83.8			2.7			86.5
Actuarial (gain) loss		(45.8	)		1.8			(44.0	)		245.8			9.8			255.6
Benefits paid		(205.6	)		(2.8	)		(208.4	)		(131.9	)		(3.6	)		(135.5	)
Curtailments/settlements		12.6			0.1			12.7			—			0.2			0.2
Business combination		498.5			171.4			669.9			—			—			—
Currency translation adjustments		—			(14.7	)		(14.7	)		—			(5.5	)		(5.5	)
Benefit obligation at end of year	$	2,458.5		$	227.4		$	2,685.9		$	2,116.5		$	66.3		$	2,182.8

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	December 31, 2015									December 31, 2014
	($ in millions)									($ in millions)
Change in Plan Assets	U.S.			Foreign			Total			U.S.			Foreign			Total
Fair value of plans’ assets at beginning of year	$	1,915.4		$	63.3		$	1,978.7		$	1,798.6		$	62.1		$	1,860.7
Actual return on plans’ assets		(25.4	)		0.4			(25.0	)		244.2			9.4			253.6
Employer contributions		77.6			1.0			78.6			4.5			0.9			5.4
Benefits paid		(205.6	)		(2.8	)		(208.4	)		(131.9	)		(3.6	)		(135.5	)
Business combination		212.0			10.8			222.8			—			—			—
Currency translation adjustments		—			(10.2	)		(10.2	)		—			(5.5	)		(5.5	)
Fair value of plans’ assets at end of year	$	1,974.0		$	62.5		$	2,036.5		$	1,915.4		$	63.3		$	1,978.7

	December 31, 2015									December 31, 2014
	($ in millions)									($ in millions)
Funded Status	U.S.			Foreign			Total			U.S.			Foreign			Total
Qualified plans	$	(480.8	)	$	(163.5	)	$	(644.3	)	$	(137.5	)	$	(1.2	)	$	(138.7	)
Non-qualified plans		(3.7	)		(1.4	)		(5.1	)		(63.6	)		(1.8	)		(65.4	)
Total funded status	$	(484.5	)	$	(164.9	)	$	(649.4	)	$	(201.1	)	$	(3.0	)	$	(204.1	)

Under ASC 715 we recorded a $78.8 million after-tax charge ($125.4 million pretax) to shareholders’ equity as of December 31, 2015 for our pension plans. This charge reflected unfavorable performance on plan assets during 2015, partially offset by a 50-basis point increase in the domestic pension plans’ discount rate. In 2014, we recorded an $84.8 million after-tax charge ($138.9 million pretax) to shareholders’ equity as of December 31, 2014 for our pension plans. This charge reflected a 60-basis point decrease in the plans’ discount rate and the negative impact of the newly mandated mortality tables, partially offset by favorable performance on plan assets during rate.

The $44.0 million actuarial gain for 2015 was primarily due to a 50-basis point increase in the domestic pension plans’ discount rate. The $12.7 million curtailments/settlements for 2015 was primarily due to the change in control which created a mandatory acceleration of payments under the domestic non-qualified pension plan as a result of the Acquisition. The $255.6 million actuarial loss for 2014 was primarily due to a 60-basis point decrease in the plans’ discount rate and the negative impact of the newly mandated mortality tables. Our benefit obligation as of December 31, 2014 increased approximately $90.0 as a result of the newly mandated mortality tables.

Amounts recognized in the consolidated balance sheets consisted of:

	December 31, 2015									December 31, 2014
	($ in millions)									($ in millions)
	U.S.			Foreign			Total			U.S.			Foreign			Total
Accrued benefit in current liabilities	$	(0.4	)	$	(0.1	)	$	(0.5	)	$	(21.8	)	$	(0.3	)	$	(22.1	)
Accrued benefit in noncurrent liabilities		(484.1	)		(164.8	)		(648.9	)		(179.3	)		(2.7	)		(182.0	)
Accumulated other comprehensive loss		714.2			26.6			740.8			654.8			23.0			677.8
Net balance sheet impact	$	229.7		$	(138.3	)	$	91.4		$	453.7		$	20.0		$	473.7

At December 31, 2015 and 2014, the benefit obligation of non-qualified pension plans was $5.1 million and $65.4 million, respectively, and was included in the above pension benefit obligation. There were no plan assets for these non-qualified pension plans. Benefit payments for the non-qualified pension plans are expected to be as follows: 2016—$0.5 million; 2017—$0.5 million; 2018—$0.4 million; 2019—$0.5 million; and 2020—$0.6 million. Benefit payments for the qualified plans are projected to be as follows: 2016—$135.9 million; 2017—$135.7 million; 2018—$136.5 million; 2019—$136.6 million; and 2020—$136.7 million.

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	December 31,
	2015		2014
	($ in millions)
Projected benefit obligation	$	2,685.9	$	2,182.8
Accumulated benefit obligation		2,655.0		2,170.8
Fair value of plan assets		2,036.5		1,978.7

	Years Ended December 31,
	2015			2014			2013
	($ in millions)
Components of Net Periodic Benefit Costs (Income)
Service cost	$	7.8		$	5.3		$	6.2
Interest cost		83.3			86.5			81.1
Expected return on plans’ assets		(147.4	)		(139.5	)		(137.5	)
Amortization of prior service cost		1.6			2.2			1.9
Recognized actuarial loss		26.2			20.3			27.8
Curtailments/settlements		47.2			0.2			—
Net periodic benefit costs (income)	$	18.7		$	(25.0	)	$	(20.5	)
Included in Other Comprehensive Loss (Pretax)
Liability adjustment	$	125.4		$	138.9		$	14.4
Amortization of prior service costs and actuarial losses		(62.4	)		(22.7	)		(29.7	)

The $47.2 million curtailments/settlements for 2015 were due to a settlement of $47.1 million of costs incurred as a result of the change in control which created a mandatory acceleration of payments under the domestic non-qualified pension plan as a result of the Acquisition. Also, for the years ended December 31, 2015 and 2014, we recorded a curtailment charge of $0.1 million and $0.2 million, respectively, associated with permanently closing a portion of the Becancour, Canada chlor alkali facility that has been shut down since late June 2014. These charges were included in restructuring charges.

The defined benefit pension plans’ actuarial loss that will be recognized from accumulated other comprehensive loss into net periodic benefit income in 2016 will be approximately $22 million.

The service cost and the amortization of prior service cost components of pension expense related to the employees of the operating segments are allocated to the operating segments based on their respective estimated census data.

Pension Plan Assumptions

Certain actuarial assumptions, such as discount rate and long-term rate of return on plan assets, have a significant effect on the amounts reported for net periodic benefit cost and accrued benefit obligation amounts. We use a measurement date of December 31 for our pension plans.

	U.S. Pension Benefits									Foreign Pension Benefits
Weighted-Average Assumptions	2015			2014			2013			2015			2014			2013
Discount rate—periodic benefit cost		3.9	%		4.5	%		3.9	%		2.8	%		4.8	%		4.2	%
Expected return on assets		7.75	%		7.75	%		7.75	%		6.0	%		7.5	%		7.75	%
Rate of compensation increase		3.0	%		3.0	%		3.0	%		3.0	%		3.5	%		3.5	%
Discount rate—benefit obligation		4.4	%		3.9	%		4.5	%		2.7	%		3.9	%		4.8	%

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The discount rate is based on a hypothetical yield curve represented by a series of annualized individual zero-coupon bond spot rates for maturities ranging from one-half to thirty years. The bonds used in the yield curve must have a rating of AA or better per Standard & Poor’s, be non-callable, and have at least $250 million par outstanding. The yield curve is then applied to the projected benefit payments from the plan. Based on these bonds and the projected benefit payment streams, the single rate that produces the same yield as the matching bond portfolio, rounded to the nearest quarter point, is used as the discount rate.

The long-term expected rate of return on plan assets represents an estimate of the long-term rate of returns on the investment portfolio consisting of equities, fixed income and alternative investments. We use long-term historical actual return information, the allocation mix of investments that comprise plan assets, and forecast estimates of long-term investment returns, including inflation rates, by reference to external sources. The historic rates of return on plan assets have been 7.5% for the last 5 years, 9.3% for the last 10 years and 8.0% for the last 15 years. The following rates of return by asset class were considered in setting the long-term rate of return assumption:

U.S. equities	9	%	to	13	%
Non-U.S. equities	10	%	to	14	%
Fixed income/cash	5	%	to	9	%
Alternative investments	5	%	to	15	%
Absolute return strategies	8	%	to	12	%

Plan Assets

Our pension plan asset allocation at December 31, 2015 and 2014, by asset class was as follows:

	Percentage of Plan Assets
Asset Class	2015			2014
U.S. equities		4	%		4	%
Non-U.S. equities		6	%		7	%
Fixed income/cash		47	%		52	%
Acquisition plan receivable		10	%		—	%
Alternative investments		19	%		21	%
Absolute return strategies		14	%		16	%
Total		100	%		100	%

The Alternative Investments asset class includes hedge funds, real estate and private equity investments. The Alternative Investments class is intended to help diversify risk and increase returns by utilizing a broader group of assets.

Absolute Return Strategies further diversify the plan’s assets through the use of asset allocations that seek to provide a targeted rate of return over inflation. The investment managers allocate funds within asset classes that they consider to be undervalued in an effort to preserve gains in overvalued asset classes and to find opportunities in undervalued asset classes.

A master trust was established by our pension plan to accumulate funds required to meet benefit payments of our plan and is administered solely in the interest of our plan’s participants and their beneficiaries. The master trust’s investment horizon is long term. Its assets are managed by professional investment managers or invested in professionally managed investment vehicles.

Our pension plan maintains a portfolio of assets designed to achieve an appropriate risk adjusted return. The portfolio of assets is also structured to protect the funding level from the negative impacts of interest rate changes on the asset and liability values. This is accomplished by investing in a portfolio of assets with a maturity duration that approximately matches the duration of the plan liabilities.

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Risk is managed by diversifying assets across asset classes whose return patterns are not highly correlated, investing in passively and actively managed strategies and in value and growth styles, and by periodic rebalancing of asset classes, strategies and investment styles to objectively set targets.

As of December 31, 2015, the following target allocation and ranges have been set for each asset class:

Asset Class	Target Allocation	Target Range
U.S. equities	6%	0-14
Non-U.S. equities	6%	0-14
Fixed income/cash	61%	48-80
Alternative investments	7%	0-28
Absolute return strategies	20%	10-30

We have international qualified defined benefit pension plans to which we made cash contributions of $0.9 million and $0.8 million in 2015 and 2014, respectively, and we anticipate less than $5 million of cash contributions to international qualified defined benefit pension plans in 2016.

Determining which hierarchical level an asset or liability falls within requires significant judgment. The following table summarizes our domestic and foreign defined benefit pension plan assets measured at fair value as of December 31, 2015:

Asset Class	Quoted Prices In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	($ in millions)
Equity securities
U.S. equities	$	36.4	$	43.2	$	—	$	79.6
Non-U.S. equities		0.8		121.9		—		122.7
Acquisition plan receivable		—		—		212.0		212.0
Fixed income/cash
Cash		60.1		—		—		60.1
Government treasuries		—		425.6		2.0		427.6
Corporate debt instruments		0.3		301.9		12.0		314.2
Asset-backed securities		—		155.6		—		155.6
Alternative investments
Hedge fund of funds		—		—		335.6		335.6
Real estate funds		—		—		27.4		27.4
Private equity funds		—		—		18.4		18.4
Absolute return strategies		—		264.6		18.7		283.3
Total assets	$	97.6	$	1,312.8	$	626.1	$	2,036.5
The following table summarizes our domestic and foreign defined benefit pension plan assets measured at fair value as of December 31, 2014:
Asset Class	Quoted Prices In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	($ in millions)
Equity securities
U.S. equities	$	69.8	$	12.4	$	—	$	82.2
Non-U.S. equities		35.4		115.5		—		150.9
Fixed income/cash
Cash		65.7		—		—		65.7

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Asset Class	Quoted Prices In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Government treasuries		—		465.6		4.3		469.9
Corporate debt instruments		0.4		329.7		9.6		339.7
Asset-backed securities		—		150.5		—		150.5
Alternative investments
Hedge fund of funds		—		—		358.8		358.8
Real estate funds		—		—		34.0		34.0
Private equity funds		—		—		17.7		17.7
Absolute return strategies		—		289.0		20.3		309.3
Total assets	$	171.3	$	1,362.7	$	444.7	$	1,978.7

U.S. equities—This class included actively and passively managed equity investments in common stock and commingled funds comprised primarily of large-capitalization stocks with value, core and growth strategies.

Non-U.S. equities—This class included actively managed equity investments in commingled funds comprised primarily of international large-capitalization stocks from both developed and emerging markets.

Acquisition plan receivable—This class included pension assets which will be transferred from TDCC’s U.S. qualified defined benefit pension plan trustee to our qualified defined benefit pension plan trustee in the form of cash related to the Acquisition. This amount is subject to certain post-closing adjustments.

Fixed income and cash—This class included commingled funds comprised of debt instruments issued by the U.S. and Canadian Treasuries, U.S. Agencies, corporate debt instruments, asset- and mortgage-backed securities and cash.

Hedge fund of funds—This class included a hedge fund which invests in the following types of hedge funds:

Event driven hedge funds—This class included hedge funds that invest in securities to capture excess returns that are driven by market or specific company events including activist investment philosophies and the arbitrage of equity and private and public debt securities.

Market neutral hedge funds—This class included investments in U.S. and international equities and fixed income securities while maintaining a market neutral position in those markets.

Other hedge funds—This class primarily included long-short equity strategies and a global macro fund which invested in fixed income, equity, currency, commodity and related derivative markets.

Real estate funds—This class included several funds that invest primarily in U.S. commercial real estate.

Private equity funds—This class included several private equity funds that invest primarily in infrastructure and U.S. power generation and transmission assets.

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Absolute return strategies—This class included multiple strategies which use asset allocations that seek to provide a targeted rate of return over inflation. The investment managers allocate funds within asset classes that they consider to be undervalued in an effort to preserve gains in overvalued asset classes and to find opportunities in undervalued asset classes. 

U.S. equities and non-U.S. equities are primarily valued at the net asset value provided by the independent administrator or custodian of the commingled fund. The net asset value is based on the value of the underlying equities, which are traded on an active market. U.S. equities are also valued at the closing price reported in an active market on which the individual securities are traded. Fixed income investments are primarily valued at the net asset value provided by the independent administrator or custodian of the fund. The net asset value is based on the underlying assets, which are valued using inputs such as the closing price reported, if traded on an active market, values derived from comparable securities of issuers with similar credit ratings, or under a discounted cash flow approach that utilizes observable inputs, such as current yields of similar instruments, but includes adjustments for risks that may not be observable such as certain credit and liquidity risks. Alternative investments are primarily valued at the net asset value as determined by the independent administrator or custodian of the fund. The net asset value is based on the underlying investments, which are valued using inputs such as quoted market prices of identical instruments, discounted future cash flows, independent appraisals and market-based comparable data. Absolute return strategies are commingled funds which reflect the fair value of our ownership interest in these funds. The investments in these commingled funds include some or all of the above asset classes and are primarily valued at net asset values based on the underlying investments, which are valued consistent with the methodologies described above for each asset class.

The following table summarizes the activity for our defined benefit pension plans level 3 assets for the year ended December 31, 2015:

	December 31, 2014		Realized Gain/(Loss)		Unrealized Gain/(Loss) Relating to Assets Held at Period End			Purchases, Sales, Settlements, and Other			Transfers In/(Out)		December 31, 2015
	($ in millions)
Acquisition plan receivable	$	—	$	—	$	—		$	212.0		$	—	$	212.0
Fixed income/cash
Government treasuries		4.3		—		(0.7	)		(1.6	)		—		2.0
Corporate debt instruments		9.6		0.5		(0.2	)		2.1			—		12.0
Alternative investments
Hedge fund of funds		358.8		7.2		(3.4	)		(27.0	)		—		335.6
Real estate funds		34.0		2.4		3.7			(12.7	)		—		27.4
Private equity funds		17.7		0.2		0.8			(0.3	)		—		18.4
Absolute return strategies		20.3		—		(0.5	)		(1.1	)		—		18.7
Total level 3 assets	$	444.7	$	10.3	$	(0.3	)	$	171.4		$	—	$	626.1

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The following table summarizes the activity for our defined benefit pension plans level 3 assets for the year ended December 31, 2014:

	December 31, 2013		Realized Gain/(Loss)		Unrealized Gain/(Loss) Relating to Assets Held at Period End			Purchases, Sales, Settlements, and Other			Transfers In/(Out)		December 31, 2014
	($ in millions)
Fixed income/cash
Government treasuries	$	4.5	$	—	$	(0.3	)	$	0.1		$	—	$	4.3
Corporate debt instruments		21.5		2.0		(1.3	)		(12.6	)		—		9.6
Alternative investments
Hedge fund of funds		315.9		—		17.9			25.0			—		358.8
Real estate funds		35.7		1.6		2.0			(5.3	)		—		34.0
Private equity funds		17.9		—		(0.2	)		—			—		17.7
Absolute return strategies		18.7		—		0.8			0.8			—		20.3
Total level 3 assets	$	414.2	$	3.6	$	18.9		$	8.0		$	—	$	444.7

POSTRETIREMENT BENEFITS

We provide certain postretirement healthcare (medical) and life insurance benefits for eligible active and retired domestic employees. The healthcare plans are contributory with participants’ contributions adjusted annually based on medical rates of inflation and plan experience. We use a measurement date of December 31 for our postretirement plans.

Effective as of December 31, 2015, we changed the approach used to measure service and interest costs for our other postretirement benefits. For the year ended December 31, 2015, we measured service and interest costs utilizing a single weighted-average discount rate derived from the yield curve used to measure the plan obligations. Beginning in 2016 for our other postretirement benefits, we elected to measure service and interest costs by applying the specific spot rates along the yield curve to the plans’ estimated cash flows. We believe the new approach provides a more precise measurement of service and interest costs by aligning the timing of the plans’ liability cash flows to the corresponding spot rates on the yield curve. This change does not affect the measurement of our plan obligations. We have accounted for this change as a change in accounting estimate and, accordingly, have accounted for it on a prospective basis.

Other Postretirement Benefits Obligations and Funded Status

Changes in the benefit obligation were as follows:

	December 31, 2015									December 31, 2014
	($ in millions)									($ in millions)
Change in Benefit Obligation	U.S.			Foreign			Total			U.S.			Foreign			Total
Benefit obligation at beginning of year	$	58.5		$	8.7		$	67.2		$	59.0		$	8.6		$	67.6
Service cost		1.1			0.1			1.2			1.0			0.1			1.1
Interest cost		2.0			0.3			2.3			2.3			0.4			2.7
Actuarial loss (gain)		(0.7	)		0.7			—			2.4			0.7			3.1
Benefits paid		(7.0	)		(0.3	)		(7.3	)		(6.2	)		(0.4	)		(6.6	)
Currency translation adjustments		—			(1.5	)		(1.5	)		—			(0.7	)		(0.7	)
Curtailment		—			0.1			0.1			—			—			—
Benefit obligation at end of year	$	53.9		$	8.1		$	62.0		$	58.5		$	8.7		$	67.2

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	December 31, 2015									December 31, 2014
	($ in millions)									($ in millions)
	U.S.			Foreign			Total			U.S.			Foreign			Total
Funded status	$	(53.9	)	$	(8.1	)	$	(62.0	)	$	(58.5	)	$	(8.7	)	$	(67.2	)

Under ASC 715 we recorded an after-tax benefit of less than $0.1 million ($0.1 million pretax) to shareholders’ equity as of December 31, 2015 for our other postretirement plans. In 2014, we recorded a $1.8 million after-tax charge ($3.1 million pretax) to shareholders’ equity as of December 31, 2014 for our other postretirement plans.

Amounts recognized in the consolidated balance sheets consisted of:

	December 31, 2015									December 31, 2014
	($ in millions)									($ in millions)
	U.S.			Foreign			Total			U.S.			Foreign			Total
Accrued benefit in current liabilities	$	(5.3	)	$	(0.3	)	$	(5.6	)	$	(5.2	)	$	(0.3	)	$	(5.5	)
Accrued benefit in noncurrent liabilities		(48.6	)		(7.8	)		(56.4	)		(53.3	)		(8.4	)		(61.7	)
Accumulated other comprehensive loss		29.7			0.2			29.9			33.6			(0.4	)		33.2
Net balance sheet impact	$	(24.2	)	$	(7.9	)	$	(32.1	)	$	(24.9	)	$	(9.1	)	$	(34.0	)

	Years Ended December 31,
	2015			2014			2013
	($ in millions)
Components of Net Periodic Benefit Cost
Service cost	$	1.2		$	1.1		$	1.3
Interest cost		2.3			2.7			2.6
Amortization of prior service cost		—			(0.1	)		(0.1	)
Recognized actuarial loss		3.1			2.9			3.7
Curtailment		0.1			—			—
Net periodic benefit cost	$	6.7		$	6.6		$	7.5
Included in Other Comprehensive Loss (Pretax)
Liability adjustment	$	(0.1	)	$	3.1		$	(1.9	)
Amortization of prior service costs and actuarial losses		(3.2	)		(2.8	)		(3.6	)

For the year ended December 31, 2015, we recorded a curtailment charge of $0.1 million associated with permanently closing a portion of the Becancour, Canada chlor alkali facility that has been shut down since late June 2014. This charge was included in restructuring charges.

The other postretirement plans’ actuarial loss that will be recognized from accumulated other comprehensive loss into net periodic benefit cost in 2016 will be approximately $3 million.

The service cost and amortization of prior service cost components of postretirement benefit expense related to the employees of the operating segments are allocated to the operating segments based on their respective estimated census data.

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Other Postretirement Benefits Plan Assumptions

Certain actuarial assumptions, such as discount rate, have a significant effect on the amounts reported for net periodic benefit cost and accrued benefit obligation amounts.

	December 31,
Weighted-Average Assumptions	2015			2014			2013
Discount rate—periodic benefit cost		3.7	%		4.3	%		3.6	%
Discount rate—benefit obligation		4.1	%		3.7	%		4.3	%

The discount rate is based on a hypothetical yield curve represented by a series of annualized individual zero-coupon bond spot rates for maturities ranging from one-half to thirty years. The bonds used in the yield curve must have a rating of AA or better per Standard & Poor’s, be non-callable, and have at least $250 million par outstanding. The yield curve is then applied to the projected benefit payments from the plan. Based on these bonds and the projected benefit payment streams, the single rate that produces the same yield as the matching bond portfolio, rounded to the nearest quarter point, is used as the discount rate.

We review external data and our own internal trends for healthcare costs to determine the healthcare cost for the post retirement benefit obligation. The assumed healthcare cost trend rates for pre-65 retirees were as follows:

	December 31,
	2015			2014
Healthcare cost trend rate assumed for next year		8.5	%		8.5	%
Rate that the cost trend rate gradually declines to		5.0	%		5.0	%
Year that the rate reaches the ultimate rate		2022			2021

For post-65 retirees, we provide a fixed dollar benefit, which is not subject to escalation.

Assumed healthcare cost trend rates have an effect on the amounts reported for the healthcare plans. A one-percentage-point change in assumed healthcare cost trend rates would have the following effects:

	One-Percentage Point Increase		One-Percentage Point Decrease
	($ in millions)
Effect on total of service and interest costs	$	0.2	$	(0.2	)
Effect on postretirement benefit obligation		3.1		(2.6	)

We expect to make payments of approximately $5 million for each of the next five years under the provisions of our other postretirement benefit plans.

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INCOME TAXES

	Years ended December 31,
	2015			2014			2013
	($ in millions)
Components of Income from Continuing Operations Before Taxes
Domestic	$	(66.9	)	$	164.4		$	222.2
Foreign		73.6			(1.7	)		27.8
Income from continuing operations before taxes	$	6.7		$	162.7		$	250.0
Components of Income Tax Provision
Current expense (benefit):
Federal	$	(16.6	)	$	25.9		$	42.1
State		1.2			1.3			9.4
Foreign		14.4			5.3			8.5
		(1.0	)		32.5			60.0
Deferred expense (benefit):
Federal	$	8.9		$	26.9		$	10.4
State		(2.4	)		3.0			1.9
Foreign		2.6			(4.7	)		(0.9	)
		9.1			25.2			11.4
Income tax provision	$	8.1		$	57.7		$	71.4

The following table accounts for the difference between the actual tax provision and the amounts obtained by applying the statutory U.S. federal income tax rate of 35% to the income from continuing operations before taxes.

	Years ended December 31,
Effective Tax Rate Reconciliation (Percent)	2015			2014			2013
Statutory federal tax rate		35.0	%		35.0	%		35.0	%
State income taxes, net		(38.2	)		2.4			2.3
Foreign rate differential		(129.8	)		0.4			(0.9	)
U.S. tax on foreign earnings		128.6			(0.6	)		0.8
Domestic manufacturing/export tax incentive		—			(1.8	)		(1.6	)
Salt depletion		(38.8	)		(0.5	)		(0.3	)
Non-deductible transaction costs		133.1			—			—
Change in valuation allowance		27.9			1.1			(2.1	)
Remeasurement of deferred taxes		7.6			0.4			0.1
Change in tax contingencies		5.0			(0.3	)		(3.8	)
Dividends paid to CEOP		(11.1	)		(0.5	)		(0.3	)
Return to provision		(4.2	)		(0.7	)		(0.1	)
Research tax credit		(3.1	)		—			(0.8	)
Other, net		8.9			0.6			0.3
Effective tax rate		120.9	%		35.5	%		28.6	%

The effective tax rate from continuing operations for 2015 included $8.9 million of expense associated with certain transaction costs related to the Acquisition that are not deductible for U.S. tax purposes and $8.6 million of expense associated with incremental U.S. tax on foreign earnings. These items were partially offset by $8.7 million of benefit associated with foreign earnings taxed at a lower rate than the U.S. statutory rate and $2.6 million of benefit associated with salt depletion deductions. The effective tax rate from continuing operations for 2014 included $1.2 million of benefit associated with return to provision adjustments for the finalization of our 2013 U.S. federal and state income tax returns and $0.7 million of benefit associated with the expiration of the statutes of limitations in federal and state jurisdictions. These items were partially offset by $0.8 million of expense associated with increases in valuation allowances on certain state tax credit balances, primarily due to a change in state tax law, and $0.6 million of expense related to the remeasurement of deferred taxes due to an increase in state effective tax rates. The effective tax rate from continuing operations for 2013 included $11.4 million of benefit associated with the expiration of the statutes of limitations in federal and state jurisdictions, $8.3 million of benefit associated with reductions in valuation allowances on our capital loss carryforwards and $1.9 million of benefit associated with the Research Credit, which were partially offset by $1.8 million of expense associated with changes in tax contingencies and $1.3 million of expense associated with increases in valuation allowances on certain state tax credits carryforwards.

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	December 31,
Components of Deferred Tax Assets and Liabilities	2015			2014
	($ in millions)
Deferred tax assets:
Pension and postretirement benefits	$	235.2		$	108.0
Environmental reserves		55.3			56.5
Asset retirement obligations		21.0			22.9
Accrued liabilities		53.7			52.5
Tax credits		23.3			9.2
Federal and state net operating losses		40.1			3.3
Capital loss carryforward		4.7			4.8
Other miscellaneous items		18.5			10.0
Total deferred tax assets		451.8			267.2
Valuation allowance		(29.3	)		(16.6	)
Net deferred tax assets		422.5			250.6
Deferred tax liabilities:
Property, plant and equipment		875.6			174.5
Intangible amortization		138.4			14.2
Inventory and prepaids		11.6			4.5
Partnerships		101.4			97.8
Taxes on unremitted earnings		294.8			—
Total deferred tax liabilities		1,421.8			291.0
Net deferred tax liability	$	(999.3	)	$	(40.4	)

Realization of the net deferred tax assets, irrespective of indefinite-lived deferred tax liabilities, is dependent on future reversals of existing taxable temporary differences and adequate future taxable income, exclusive of reversing temporary differences and carryforwards. Although realization is not assured, we believe that it is more likely than not that the net deferred tax assets will be realized.

At December 31, 2015, we had a U.S. net operating loss carryforward (NOL) of approximately $75.9 million (representing $26.6 million of deferred tax assets), that will expire in years 2017 through 2035, if not utilized. The utilization of $2.5 million of the deferred tax assets are limited under Section 382 of the U.S. Internal Revenue Code to $0.5 million in each year through 2020.

At December 31, 2015, we had deferred state tax benefits of $9.3 million relating to state NOLs, which are available to offset future state taxable income through 2035.

At December 31, 2015, we had deferred state tax benefits of $13.6 million relating to state tax credits, which are available to offset future state tax liabilities through 2030.

At December 31, 2015, we had a capital loss carryforward of $12.3 million (representing $4.7 million of deferred tax assets) that is available to offset future consolidated capital gains that will expire in years 2016 through 2020 if not utilized.

At December 31, 2015, we had a NOL of approximately $23.1 million (representing $4.2 million of deferred tax assets) in various foreign jurisdictions. Of these, $8.2 million (representing $1.7 million of deferred tax assets) expire in various years from 2020 to 2025. The remaining $14.9 million (representing $2.5 million of deferred tax assets) do not expire.

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The activity of our deferred income tax valuation allowance was as follows:

	December 31,
	2015			2014
	($ in millions)
Beginning balance	$	16.6		$	13.4
Charged to income tax provision		1.8			4.1
Acquisition activity		12.3			—
Deductions from reserves - credited to income tax provision		(1.4	)		(0.9	)
Ending balance	$	29.3		$	16.6

As of December 31, 2015, we had $35.1 million of gross unrecognized tax benefits, which would have a net $33.5 million impact on the effective tax rate from continuing operations, if recognized. As of December 31, 2014, we had $36.1 million of gross unrecognized tax benefits, which would have a net $35.0 million impact on the effective tax rate from continuing operations, if recognized. The change for 2015 primarily relates to additional gross unrecognized benefits for prior year tax positions, as well as the settlement of ongoing audits. The change for 2014 primarily relates to additional gross unrecognized benefits for current year and prior year tax positions, as well as the expiration of statute of limitations in domestic jurisdictions and settlement of ongoing audits. The amounts of unrecognized tax benefits were as follows:

	December 31,
	2015			2014
	($ in millions)
Beginning balance	$	36.1		$	34.5
Increase for current year tax positions		—			2.2
Increase for prior year tax positions		0.2			0.2
Reductions due to statute of limitations		—			(0.4	)
Decrease for prior year tax positions		—			(0.3	)
Decrease due to tax settlements		(1.2	)		(0.1	)
Ending balance	$	35.1		$	36.1

Income from discontinued operations, net for the year ended December 31, 2014 included $2.2 million of tax expense related to changes in tax contingencies.

We recognize interest and penalty expense related to unrecognized tax positions as a component of the income tax provision. As of December 31, 2015 and 2014, interest and penalties accrued were $3.4 million and $3.2 million, respectively. For 2015, 2014 and 2013, we recorded expense (benefit) related to interest and penalties of $0.2 million, $0.4 million and $(0.5) million, respectively.

As of December 31, 2015, we believe it is reasonably possible that our total amount of unrecognized tax benefits will decrease by approximately $9.4 million over the next twelve months. The anticipated reduction primarily relates to settlements with tax authorities and the expiration of federal, state and foreign statutes of limitation.

We operate globally and file income tax returns in numerous jurisdictions. Our tax returns are subject to examination by various federal, state and local tax authorities. Our U.S. federal income tax returns are under examination by the Internal Revenue Service (IRS) for tax years 2008 and 2010 to 2012. Our Canadian federal income tax returns are under examination by Canada Revenue Authority (CRA) for tax years 2010 and 2011.

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In connection with the Acquisition, TDCC retained liabilities relating to taxes to the extent arising prior to the Closing Date. 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	2008; 2010 - 2015
U.S. state income tax	2006 - 2014
Canadian federal income tax	2010 - 2014
Brazil	2014 - 2015
Germany	2015
China	2014 - 2015
The Netherlands	2014 - 2015
South Korea	2014 - 2015
Hong Kong	2015

ACCRUED LIABILITIES

Included in accrued liabilities were the following:

	December 31,
	2015		2014
	($ in millions)
Acquisition-related accruals	$	90.2	$	—
Accrued compensation and payroll taxes		53.4		40.4
Accrued interest		35.0		4.7
Legal and professional costs		32.0		26.3
Accrued employee benefits		24.4		41.5
Environmental (current portion only)		19.0		19.0
Asset retirement obligation (current portion only)		7.3		10.2
Other		66.8		72.2
Accrued liabilities	$	328.1	$	214.3

CONTRIBUTING EMPLOYEE OWNERSHIP PLAN

The CEOP is a defined contribution plan available to essentially all domestic employees. Company matching contributions are invested in the same investment allocation as the employee’s contribution. Our matching contributions for eligible employees amounted to $6.9 million, $5.7 million and $5.2 million in 2015, 2014 and 2013, respectively.

Employees generally become vested in the value of the contributions we make to the CEOP according to a schedule based on service. After two years of service, participants are 25% vested. They vest in increments of 25% for each additional year and after five years of service, they are 100% vested in the value of the contributions that we have made to their accounts.

Employees may transfer any or all of the value of the investments, including Olin common stock, to any one or combination of investments available in the CEOP. Employees may transfer balances daily and may elect to transfer any percentage of the balance in the fund from which the transfer is made. However, when transferring out of a fund, employees are prohibited from trading out of the fund to which the transfer was made for seven calendar days. This limitation does not apply to trades into the money market fund or the Olin Common Stock Fund.

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STOCK-BASED COMPENSATION

Stock-based compensation expense was allocated to the operating segments for the portion related to employees whose compensation would be included in cost of goods sold with the remainder recognized in corporate/other. There were no significant capitalized stock-based compensation costs. Stock-based compensation granted includes stock options, performance stock awards, restricted stock awards and deferred directors’ compensation. Stock-based compensation expense was as follows:

	Years ended December 31,
	2015			2014			2013
	($ in millions)
Stock-based compensation	$	11.5		$	9.2		$	13.3
Mark-to-market adjustments		(3.0	)		(3.6	)		4.2
Total expense	$	8.5		$	5.6		$	17.5

Stock Plans

Under the stock option and long-term incentive plans, options may be granted to purchase shares of our common stock at an exercise price not less than fair market value at the date of grant, and are exercisable for a period not exceeding ten years from that date. Stock options, restricted stock and performance shares typically vest over three years. We issue shares to settle stock options, restricted stock and share-based performance awards. In 2015, 2014 and 2013 long-term incentive awards included stock options, performance share awards and restricted stock. The stock option exercise price was set at the fair market value of common stock on the date of the grant, and the options have a ten-year term.

Stock option transactions were as follows:

								Exercisable
	Shares			Option Price		Weighted- Average Option Price		Options		Weighted- Average Exercise Price
Outstanding at January 1, 2015		4,133,753		$	14.28-27.64	$	20.14		2,976,870	$	18.50
Granted		776,750			27.40		27.40
Exercised		(147,608	)		14.28-25.57		20.11
Canceled		(42,790	)		23.28-27.40		25.14
Outstanding at December 31, 2015		4,720,105		$	14.28-27.65	$	21.29		3,371,449	$	19.28

At December 31, 2015, the average exercise period for all outstanding and exercisable options was 65 months and 50 months, respectively. At December 31, 2015, the aggregate intrinsic value (the difference between the exercise price and market value) for outstanding options was $2.5 million and exercisable options was $2.5 million. The total intrinsic value of options exercised during the years ended December 31, 2015, 2014 and 2013 was $1.3 million, $3.9 million and $4.2 million, respectively.

The total unrecognized compensation cost related to unvested stock options at December 31, 2015 was $5.3 million and was expected to be recognized over a weighted-average period of 1.3 years.

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The following table provides certain information with respect to stock options exercisable at December 31, 2015:

Range of Exercise Prices	Options Exercisable		Weighted- Average Exercise Price		Options Outstanding		Weighted- Average Exercise Price
Under $16.00		916,046	$	15.05		916,046	$	15.05
$16.00 – $22.00		1,870,281		19.85		1,870,281		19.85
Over $22.00		585,122		24.11		1,933,778		25.65
		3,371,449				4,720,105

At December 31, 2015, common shares reserved for issuance and available for grant or purchase under the following plans consisted of:

	Number of Shares
Stock Option Plans	Reserved for Issuance		Available for Grant or Purchase(1)
2000 long term incentive plan		277,586		2,911
2003 long term incentive plan		389,921		10,138
2006 long term incentive plan		1,591,479		168,783
2009 long term incentive plan		2,762,161		506,610
2014 long term incentive plan		3,000,000		2,009,000
Total under stock option plans		8,021,147		2,697,442
	Number of Shares
Stock Purchase Plans	Reserved for Issuance		Available for Grant or Purchase
1997 stock plan for non-employee directors		572,978		567,476
Employee deferral plan		45,627		45,623
Total under stock purchase plans		618,605		613,099

(1) All available to be issued as stock options, but includes a sub-limit for all types of stock awards of 1,420,442 shares.

Under the stock purchase plans, our non-employee directors may defer certain elements of their compensation into shares of our common stock based on fair market value of the shares at the time of deferral. Non-employee directors annually receive stock grants as a portion of their director compensation. Of the shares reserved under the stock purchase plans at December 31, 2015, 5,501 shares were committed.

Performance share awards are denominated in shares of our stock and are paid half in cash and half in stock. Payouts are based on Olin’s average annual return on capital over a three-year performance cycle in relation to the average annual return on capital over the same period among a portfolio of public companies which are selected in concert with outside compensation consultants. The expense associated with performance shares is recorded based on our estimate of our performance relative to the respective target.

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If an employee leaves the company before the end of the performance cycle, the performance shares may be prorated based on the number of months of the performance cycle worked and are settled in cash instead of half in cash and half in stock when the three-year performance cycle is completed. Performance share transactions were as follows:

	To Settle in Cash					To Settle in Shares
	Shares			Weighted- Average Fair Value per Share		Shares			Weighted- Average Fair Value per Share
Outstanding at January 1, 2015		290,917		$	23.04		281,000		$	23.46
Granted		126,000			27.40		126,000			27.40
Paid/Issued		(105,611	)		23.04		(101,000	)		21.92
Converted from shares to cash		2,111			24.42		(2,111	)		24.42
Canceled		(1,889	)		25.83		(1,889	)		26.49
Outstanding at December 31, 2015		311,528		$	17.48		302,000		$	25.59
Total vested at December 31, 2015		201,528		$	17.48		192,000		$	24.81

The summary of the status of our unvested performance shares to be settled in cash were as follows:

	Shares			Weighted- Average Fair Value per Share
Unvested at January 1, 2015		87,334		$	23.04
Granted		126,000			27.40
Vested		(101,445	)		17.48
Canceled		(1,889	)		25.83
Unvested at December 31, 2015		110,000		$	17.48

At December 31, 2015, the liability recorded for performance shares to be settled in cash totaled $3.5 million. The total unrecognized compensation cost related to unvested performance shares at December 31, 2015 was $4.9 million and was expected to be recognized over a weighted-average period of 1.2 years.

SHAREHOLDERS’ EQUITY

On April 24, 2014, our board of directors authorized a new share repurchase program for up to 8 million shares of common stock that will terminate in three years for any of the remaining shares not yet repurchased. This authorization replaced the July 2011 share repurchase program. For the year ended December 31, 2015, no shares were purchased and retired. We repurchased and retired 2.5 million and 1.5 million shares in 2014 and 2013, respectively, at a cost of $64.8 million and $36.2 million, respectively. As of December 31, 2015, we had repurchased a total of 1.9 million shares under the April 2014 program, and 6.1 million shares remained authorized to be purchased. Under the Merger Agreement relating to the Acquisition, we were restricted from repurchasing shares of our common stock prior to the consummation of the Merger. For a period of two years subsequent to the Closing Date of the Merger, we will continue to be subject to certain restrictions on our ability to conduct share repurchases.

During 2015, 2014 and 2013, we issued 0.1 million, 0.5 million and 0.5 million shares, respectively, with a total value of $3.1 million, $12.1 million and $9.7 million, respectively, representing stock options exercised.

We have registered an undetermined amount of securities with the SEC, so that, from time-to-time, we may issue debt securities, preferred stock and/or common stock and associated warrants in the public market under that registration statement.

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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 Postretirement Benefits (net of taxes)			Accumulated Other Comprehensive Loss
	($ in millions)
Balance at January 1, 2013	$	2.1		$	4.7		$	(378.1	)	$	(371.3	)
Unrealized losses		(2.6	)		(7.7	)		(12.5	)		(22.8	)
Reclassification adjustments into income		—			1.4			33.3			34.7
Tax benefit (provision)		—			2.5			(8.2	)		(5.7	)
Net change		(2.6	)		(3.8	)		12.6			6.2
Balance at December 31, 2013		(0.5	)		0.9			(365.5	)		(365.1	)
Unrealized losses		(1.8	)		(10.2	)		(142.0	)		(154.0	)
Reclassification adjustments into income		—			1.8			25.5			27.3
Tax benefit		—			3.3			45.4			48.7
Net change		(1.8	)		(5.1	)		(71.1	)		(78.0	)
Balance at December 31, 2014		(2.3	)		(4.2	)		(436.6	)		(443.1	)
Unrealized losses		(15.7	)		(13.9	)		(125.3	)		(154.9	)
Reclassification adjustments into income		—			9.7			65.6			75.3
Tax benefit		5.9			1.5			22.8			30.2
Net change		(9.8	)		(2.7	)		(36.9	)		(49.4	)
Balance at December 31, 2015	$	(12.1	)	$	(6.9	)	$	(473.5	)	$	(492.5	)

Net (loss) income and cost of goods sold included reclassification adjustments for realized gains and losses on derivative contracts from accumulated other comprehensive loss.

Net (loss) income, cost of goods sold and selling and administration expenses included the amortization of prior service costs and actuarial losses from accumulated other comprehensive loss. This amortization is recognized equally in cost of goods sold and selling and administration expenses.

SEGMENT INFORMATION

We define segment results as income (loss) from continuing operations before interest expense, interest income, other operating income, other income (expense) and income taxes, and include the results of non-consolidated affiliates. Consistent with the guidance in ASC 280, we have determined it is appropriate to include the operating results of non-consolidated affiliates in the relevant segment financial results. Beginning in the fourth quarter of 2015, we modified our reportable segments due to changes in our organization resulting from the Acquisition. We have three operating segments: Chlor Alkali Products and Vinyls, Epoxy and Winchester. For segment reporting purposes, the Acquired Business’s Global Epoxy operating results comprise the newly created Epoxy segment and the Acquired Chlor Alkali Business operating results combined with our former Chlor Alkali Products and Chemical Distribution segments comprise the newly created Chlor Alkali Products and Vinyls segment. The new reporting structure has been retrospectively applied to financial results for all periods presented. 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.

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	Years ended December 31,
	2015			2014			2013
	($ in millions)
Sales:
Chlor Alkali Products and Vinyls	$	1,713.4		$	1,502.8		$	1,737.4
Epoxy		429.6			—			—
Winchester		711.4			738.4			777.6
Total sales	$	2,854.4		$	2,241.2		$	2,515.0
Income (loss) from continuing operations before taxes:
Chlor Alkali Products and Vinyls	$	115.5		$	130.1		$	213.5
Epoxy		(7.5	)		—			—
Winchester		115.6			127.3			143.2
Corporate/Other		(40.8	)		(33.9	)		(62.6	)
Restructuring charges		(2.7	)		(15.7	)		(5.5	)
Acquisition-related costs		(123.4	)		(4.2	)		—
Other operating income		45.7			1.5			0.7
Interest expense		(97.0	)		(43.8	)		(38.6	)
Interest income		1.1			1.3			0.6
Other income (expense)		0.2			0.1			(1.3	)
Income from continuing operations before taxes	$	6.7		$	162.7		$	250.0
Earnings of non-consolidated affiliates:
Chlor Alkali Products and Vinyls	$	1.7		$	1.7		$	2.8
Depreciation and amortization expense:
Chlor Alkali Products and Vinyls	$	186.1		$	119.4		$	117.5
Epoxy		20.9			—			—
Winchester		17.4			16.3			14.9
Corporate/Other		4.5			3.4			2.9
Total depreciation and amortization expense	$	228.9		$	139.1		$	135.3
Capital spending:
Chlor Alkali Products and Vinyls	$	94.5		$	49.6		$	68.0
Epoxy		7.7			—			—
Winchester		25.6			21.4			21.2
Corporate/Other		3.1			0.8			1.6
Total capital spending	$	130.9		$	71.8		$	90.8

	December 31,
	2015		2014
	($ in millions)
Assets:
Chlor Alkali Products and Vinyls	$	6,690.7	$	1,939.0
Epoxy		1,591.2		—
Winchester		411.9		361.0
Corporate/Other		595.1		389.2
Total assets	$	9,288.9	$	2,689.2
Investments—affiliated companies (at equity):
Chlor Alkali Products and Vinyls	$	25.0	$	23.3

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Segment assets include only those assets which are directly identifiable to an operating segment. Assets of the corporate/other segment include primarily such items as cash and cash equivalents, deferred taxes, restricted cash and other assets.

	Years ended December 31,
Geographic Data	2015		2014		2013
	($ in millions)
Sales:
United States	$	2,208.5	$	2,051.4	$	2,316.2
Foreign		645.9		189.8		198.8
Total sales	$	2,854.4	$	2,241.2	$	2,515.0

	Years ended December 31,
	2015		2014
	($ in millions)
Long-lived assets:
United States	$	3,561.7	$	889.6
Foreign		391.7		41.4
Total long-lived assets	$	3,953.4	$	931.0

Sales are attributed to geographic areas based on customer location and long-lived assets are attributed to geographic areas based on asset location.

ENVIRONMENTAL

As is common in our industry, we are subject to environmental laws and regulations related to the use, storage, handling, generation, transportation, emission, discharge, disposal and remediation of, and exposure to, hazardous and non-hazardous substances and wastes in all of the countries in which we do business.

The establishment and implementation of national, state or provincial and local standards to regulate air, water and land quality affect substantially all of our manufacturing locations around the world. Laws providing for regulation of the manufacture, transportation, use and disposal of hazardous and toxic substances, and remediation of contaminated sites, have imposed additional regulatory requirements on industry, particularly the chemicals industry. In addition, implementation of environmental laws has required and will continue to require new capital expenditures and will increase plant operating costs. We employ waste minimization and pollution prevention programs at our manufacturing sites.

In connection with the Acquisition, TDCC retained liabilities relating to releases of hazardous materials and violations of environmental law to the extent arising prior to the Closing Date.

We are party to various governmental and private environmental actions associated with past manufacturing facilities and former waste disposal sites. Associated costs of investigatory and remedial activities are provided for in accordance with generally accepted accounting principles governing probability and the ability to reasonably estimate future costs. Our ability to estimate future costs depends on whether our investigatory and remedial activities are in preliminary or advanced stages. With respect to unasserted claims, we accrue liabilities for costs that, in our experience, we may incur to protect our interests against those unasserted claims. Our accrued liabilities for unasserted claims amounted to $1.8 million at December 31, 2015. With respect to asserted claims, we accrue liabilities based on remedial investigation, feasibility study, remedial action and operation, maintenance and monitoring (OM&M) expenses that, in our experience, we may incur in connection with the asserted claims. Required site OM&M expenses are estimated and accrued in their entirety for required periods not exceeding 30 years, which reasonably approximates the typical duration of long-term site OM&M.

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Our liabilities for future environmental expenditures were as follows:

	December 31,
	2015			2014
	($ in millions)
Beginning balance	$	138.3		$	144.6
Charges to income		15.7			9.6
Remedial and investigatory spending		(14.1	)		(14.9	)
Currency translation adjustments		(1.8	)		(1.0	)
Ending balance	$	138.1		$	138.3

At December 31, 2015 and 2014, our consolidated balance sheets included environmental liabilities of $119.1 million and $119.3 million, respectively, which were classified as other noncurrent liabilities. Our environmental liability amounts do not take into account any discounting of future expenditures or any consideration of insurance recoveries or advances in technology. These liabilities are reassessed periodically to determine if environmental circumstances have changed and/or remediation efforts and our estimate of related costs have changed. As a result of these reassessments, future charges to income may be made for additional liabilities. Of the $138.1 million included on our consolidated balance sheet at December 31, 2015 for future environmental expenditures, we currently expect to utilize $81.1 million of the reserve for future environmental expenditures over the next 5 years, $16.7 million for expenditures 6 to 10 years in the future, and $40.3 million for expenditures beyond 10 years in the future.

Our total estimated environmental liability at December 31, 2015 was attributable to 69 sites, 14 of which were USEPA NPL sites. Nine sites accounted for 79% of our environmental liability and, of the remaining 60 sites, no one site accounted for more than 3% of our environmental liability. At four of the nine sites, part of the site is subject to a remedial investigation and another part is in the long-term OM&M stage. At one of the nine sites, a remedial design is being developed. At one of the nine sites, part of the site is subject to a remedial investigation and another part a remedial design is being developed. At one of these nine sites, a remedial investigation is being performed. The two remaining sites are in long-term OM&M. All nine sites are either associated with past manufacturing operations or former waste disposal sites. None of the nine largest sites represents more than 23% of the liabilities reserved on our consolidated balance sheet at December 31, 2015 for future environmental expenditures.

Charges to income for investigatory and remedial efforts were material to operating results in 2015, 2014 and 2013 and may be material to operating results in future years.

Environmental provisions charged (credited) to income, which are included in cost of goods sold, were as follows:

	Years ended December 31,
	2015		2014			2013
	($ in millions)
Charges to income	$	15.7	$	9.6		$	11.5
Recoveries from third parties of costs incurred and expensed in prior periods		—		(1.4	)		(1.3	)
Total environmental expense	$	15.7	$	8.2		$	10.2

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These charges relate primarily to remedial and investigatory activities associated with past manufacturing operations and former waste disposal sites.

Annual environmental-related cash outlays for site investigation and remediation are expected to range between approximately $15 million to $25 million over the next several years, which are expected to be charged against reserves recorded on our consolidated balance sheet. While we do not anticipate a material increase in the projected annual level of our environmental-related cash outlays for site investigation and remediation, there is always the possibility that such an increase may occur in the future in view of the uncertainties associated with environmental exposures. Environmental exposures are difficult to assess for numerous reasons, including the identification of new sites, developments at sites resulting from investigatory studies, advances in technology, changes in environmental laws and regulations and their application, changes in regulatory authorities, the scarcity of reliable data pertaining to identified sites, the difficulty in assessing the involvement and financial capability of other PRPs, our ability to obtain contributions from other parties and the lengthy time periods over which site remediation occurs. It is possible that some of these matters (the outcomes of which are subject to various uncertainties) may be resolved unfavorably to us, which could materially adversely affect our financial position or results of operations. At December 31, 2015, we estimate that it is reasonably possible that we may have additional contingent environmental liabilities of $60 million in addition to the amounts for which we have already recorded as a reserve.

COMMITMENTS AND CONTINGENCIES

The following table summarizes our contractual commitments under non-cancelable operating leases and purchase contracts as of December 31, 2015:

	Operating Leases		Purchase Commitments
	($ in millions)
2016	$	73.7	$	560.2
2017		60.9		506.4
2018		51.7		449.3
2019		39.5		442.1
2020		27.3		440.3
Thereafter		80.2		2,904.9
Total commitments	$	333.3	$	5,303.2

Our operating lease commitments are primarily for railroad cars but also include distribution, warehousing and office space and data processing and office equipment. Virtually none of our lease agreements contain escalation clauses or step rent provisions. Total rent expense charged to operations amounted to $75.1 million, $66.8 million and $64.2 million in 2015, 2014 and 2013, respectively (sublease income is not significant). The above purchase commitments include raw material, capital expenditure and utility purchasing commitments utilized in our normal course of business for our projected needs. In connection with the Acquisition, certain additional agreements have been entered into with TDCC, including, long-term purchase agreements for raw materials. These agreements are maintained through long-term cost based contracts that provide us with a reliable supply of key raw materials. Key raw materials received from TDCC include ethylene, propylene and benzene.

We, and our subsidiaries, are defendants in various legal actions (including proceedings based on alleged exposures to asbestos) incidental to our past and current business activities. At December 31, 2015 and 2014, our consolidated balance sheets included liabilities for these legal actions of $21.2 million and $22.1 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 Acquisition, TDCC retained liabilities related to litigation to the extent arising prior to the Closing Date.

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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” (ASC 450) and therefore do not record gain contingencies and recognize income until it is earned and realizable.

For the year ended December 31, 2015 we recognized insurance recoveries of $57.4 million for property damage and business interruption related to the Becancour, Canada and McIntosh, AL chlor alkali facilities. Cost of goods sold was reduced by $10.5 million and selling and administration was reduced by $0.9 million for the reimbursement of costs incurred and expensed in prior periods and other operating income included a gain of $46.0 million. The consolidated statement of cash flows for the year ended December 31, 2015 included $25.8 million for the property damage portion of the insurance recoveries within proceeds from disposition of property, plant and equipment and gains on disposition of property, plant and equipment.

For the year ended December 31, 2013, we recognized $11.0 million as a reduction of cost of goods sold related to a Chlor Alkali Products and Vinyls favorable contract settlement. Also for the year ended December 31, 2013, we recognized $13.9 million as a reduction of selling and administration expense related to the recovery of legacy legal costs.

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) required an entity to recognize all derivatives as either assets or liabilities in the statement of financial position and measure those instruments at fair value. We use hedge accounting treatment for substantially all of our business transactions whose risks are covered using derivative instruments. In accordance with ASC 815, we designate commodity forward contracts as cash flow hedges of forecasted purchases of commodities and 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 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. Those commodity contracts that extend beyond one year correspond with raw material purchases for long-term fixed-price sales contracts.

We enter into forward sales and purchase contracts to manage currency risk resulting from purchase and sale commitments denominated in foreign currencies. At December 31, 2015 we had outstanding forward contracts to buy foreign currency with a notional value of $21.7 million and to sell foreign currency with a notional value of $10.1 million. All of the currency derivatives expire within one year and are for USD equivalents.

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The counterparties to the forward contracts were 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, 2014, we had no forward contracts to buy or sell foreign currencies.

In March 2010, we entered into interest rate swaps on $125 million of our underlying fixed-rate debt obligations, whereby we agreed to pay variable rates to a counterparty who, in turn, pays us fixed rates. The counterparty to these agreements is Citibank. In October 2011, we entered into $125 million of interest rate swaps with equal and opposite terms as the $125 million variable interest rate swaps on the 2016 Notes. We have agreed to pay a fixed rate to a counterparty who, in turn, pays us variable rates. The counterparty to this agreement is also Citibank. The result was a gain of $11.0 million on the $125 million variable interest rate swaps, which will be recognized through 2016. As of December 31, 2015, $1.2 million of this gain was included in current installments of long-term debt. In October 2011, we de-designated our $125 million interest rate swaps that had previously been designated as fair value hedges. The $125 million variable interest rate swaps and the $125 million fixed interest rate swaps do not meet the criteria for hedge accounting. All changes in the fair value of these interest rate swaps are recorded currently in earnings.

Cash Flow Hedges

ASC 815 requires that all derivative instruments be recorded on the balance sheet at their fair value. 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 into earnings. Gains and losses on the derivatives representing hedge ineffectiveness are recognized currently in earnings.

We had the following notional amount of outstanding commodity forward contracts that were entered into to hedge forecasted purchases:

	December 31,
	2015		2014
	($ in millions)
Copper	$	43.6	$	62.7
Zinc		8.7		6.8
Lead		9.3		14.1
Natural gas		2.0		5.7

As of December 31, 2015, the counterparty to $43.3 million of these commodity forward contracts was Wells Fargo, a major financial institution, and the counterparty to $20.3 million of these commodity forward contracts was Citibank, a major financial institution.

We use cash flow hedges for certain raw material 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 associated with forecasted purchases of raw materials and energy used in our manufacturing process. At December 31, 2015, we had open positions in futures contracts through 2021. If all open futures contracts had been settled on December 31, 2015, we would have recognized a pretax loss of $11.4 million.

If commodity prices were to remain at December 31, 2015 levels, approximately $5.0 million of deferred losses 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.

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Fair Value Hedges

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. We had no interest rate swaps designated as fair value hedges as of December 31, 2015 and 2014.

In June 2012, we terminated $73.1 million of interest rate swaps with Wells Fargo that had been entered into on the SunBelt Notes in May 2011. The result was a gain of $2.2 million which will be recognized through 2017. As of December 31, 2015, $0.4 million of this gain was included in long-term debt.

We use interest rate swaps as a means of managing interest expense and floating interest rate exposure to optimal levels. These interest rate swaps are treated as fair value hedges. The accounting for gains and losses associated with changes in fair value of the derivative and the effect on the consolidated financial statements will depend on the hedge designation and whether the hedge is effective in offsetting changes in fair value of cash flows of the asset or liability being hedged.

Financial Statement Impacts

We present our derivative assets and liabilities in our consolidated balance sheets on a net basis whenever we have a legally enforceable master netting agreement with the counterparty to our derivative contracts. We use these agreements to manage and substantially reduce our potential counterparty credit risk.

The following table summarizes the location and fair value of the derivative instruments on our consolidated balance sheets. 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:

	Asset Derivatives							Liability Derivatives
		Fair Value							Fair Value
		December 31,							December 31,
Derivatives Designated as Hedging Instruments	Balance Sheet Location	2015			2014			Balance Sheet Location	2015			2014
		($ in millions)							($ in millions)
Interest rate contracts	Other current assets	$	—		$	—		Current installments of long-term debt	$	1.2		$	—
Interest rate contracts	Other assets		—			—		Long-term debt		0.4			4.5
Commodity contracts – losses	Other current assets		—			—		Accrued liabilities		11.5			7.2
Commodity contracts – gains	Other current assets		—			—		Accrued liabilities		(0.1	)		(0.1	)
		$	—		$	—			$	13.0		$	11.6
Derivatives Not Designated as Hedging Instruments
Interest rate contracts – gains	Other current assets	$	1.2		$	—		Accrued liabilities	$	—		$	—
Interest rate contracts – losses	Other current assets		(0.1	)		—		Accrued liabilities		—			—
Interest rate contracts – gains	Other assets		—			4.3		Other liabilities		—			—
Interest rate contracts – losses	Other assets		—			(0.8	)	Other liabilities		—			—
Commodity contracts – losses	Other current assets		—			—		Accrued liabilities		0.2			1.5
Foreign exchange contracts – gains	Other current assets		0.1			—		Accrued liabilities		—			—
			1.2			3.5			$	0.2		$	1.5
Total derivatives(1)			1.2			3.5			$	13.2		$	13.1

(1) Does not include the impact of cash collateral received from or provided to counterparties.

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The following table summarizes the effects of derivative instruments on our consolidated statements of operations:

		Amount of Gain (Loss)
		Years Ended December 31,
	Location of Gain (Loss)	2015			2014			2013
		($ in millions)
Derivatives – Cash Flow Hedges
Recognized in other comprehensive loss (effective portion)	—	$	(13.9	)	$	(10.2	)	$	(7.7	)
Reclassified from accumulated other comprehensive loss into income (effective portion)	Cost of goods sold	$	(9.7	)	$	(1.8	)	$	(1.4	)
Derivatives – Fair Value Hedges
Interest rate contracts	Interest expense	$	2.8		$	2.9		$	2.9
Derivatives Not Designated as Hedging Instruments
Commodity contracts	Cost of goods sold	$	(2.2	)	$	1.4		$	0.4
Foreign exchange contracts	Selling and administration		0.1			—			—
		$	(2.1	)	$	1.4		$	0.4

The ineffective portion of changes in fair value resulted in zero charged or credited to earnings for the years ended December 31, 2015, 2014 and 2013.

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, exceed a specific threshold. If the threshold is exceeded, cash is either provided by the counterparty to us if the value of the derivatives is our asset, or cash is provided by us to the counterparty if the value of the derivatives is our liability. As of December 31, 2015, the amount recognized in accrued liabilities for cash collateral provided by us to counterparties was $5.6 million. As of December 31, 2014, 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

Assets and liabilities recorded at fair value in the consolidated balance sheets are categorized based upon the level of judgment associated with the inputs used to measure their fair value. Hierarchical levels are directly related to the amount of subjectivity associated with the inputs to fair valuation of these assets and liabilities. 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.

57

Determining which hierarchical level an asset or liability falls within requires significant judgment. The following table summarizes the assets and liabilities measured at fair value in the consolidated balance sheets:

Balance at December 31, 2015	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	($ in millions)
Assets
Interest rate swaps	$	—	$	1.1	$	—	$	1.1
Foreign exchange contracts		—		0.1		—		0.1
Liabilities
Interest rate swaps		—		1.6		—		1.6
Commodity forward contracts		—		11.6		—		11.6
Balance at December 31, 2014
Assets
Interest rate swaps	$	—	$	3.5	$	—	$	3.5
Liabilities
Interest rate swaps		—		4.5		—		4.5
Commodity forward contracts		—		8.6		—		8.6

For the year ended December 31, 2015, there were no transfers into or out of Level 1 and Level 2.

The following table summarizes the activity for our earn out liability measured at fair value using Level 3 inputs:

	December 31,
	2015		2014
	($ in millions)
Beginning balance	$	—	$	26.7
Settlements		—		(26.7	)
Ending balance	$	—	$	—

Interest Rate Swaps

The fair value of the interest rate swaps was included in other current assets, current installments of long-term debt and long-term debt as of December 31, 2015. The fair value of the interest rate swaps was included in other assets and long-term debt as of December 31, 2014. These 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

The fair value of the commodity forward contracts was classified in accrued liabilities as of December 31, 2015 and 2014, with unrealized gains and losses included in accumulated other comprehensive loss, net of applicable taxes. These 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 forward contracts for certain raw materials and energy costs such as copper, zinc, lead and natural gas to provide a measure of stability in managing our exposure to price fluctuations.

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Foreign Currency Contracts

The fair value of foreign currency contracts was classified within other current assets as of December 31, 2015, with gains and losses included in selling and administration expense as these financial instruments do not meet the criteria to qualify for hedge accounting. We had no fair value of foreign currency contracts as of December 31, 2014. 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, restricted cash, 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 balance sheets:

	Fair Value Measurements
	Level 1		Level 2		Level 3		Total		Amount recorded on balance sheets
	($ in millions)
Balance at December 31, 2015	$	—	$	3,826.9	$	153.0	$	3,979.9	$	3,848.8
Balance at December 31, 2014		—		531.9		153.0		684.9		666.2

Earn Out

On February 11, 2011 we acquired PolyOne’s 50% interest in SunBelt. With this acquisition, we agreed to a three-year earn out, which had no guaranteed minimum or maximum, based on the performance of SunBelt. The fair value of the earn out was estimated using a probability-weighted discounted cash flow model. This fair value measurement was based on significant inputs not observed in the market. Key assumptions in determining the fair value of the earn out included the discount rate and cash flow projections. The final earn out payment was made in 2014.

For the year ended December 31, 2014, we paid $26.7 million for the earn out related to the 2013 SunBelt performance. The earn out payment for 2014 included $14.8 million that was recognized as part of the original purchase price. The $14.8 million is included as a financing activity in the statement of cash flows.

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 December 31, 2015 and 2014.

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OTHER FINANCIAL DATA

Quarterly Data (Unaudited)

($ in millions, except per share data)

2015	First Quarter		Second Quarter		Third Quarter		Fourth Quarter			Year
Sales	$	518.0	$	535.4	$	533.6	$	1,267.4		$	2,854.4
Cost of goods sold		433.2		445.5		460.0		1,148.1			2,486.8
Net income (loss)		13.1		42.3		5.9		(62.7	)		(1.4	)
Net income (loss) per common share:
Basic		0.17		0.55		0.08		(0.39	)		(0.01	)
Diluted		0.17		0.54		0.08		(0.39	)		(0.01	)
Common dividends per share		0.20		0.20		0.20		0.20			0.80
Market price of common stock(1)
High		34.34		32.56		27.18		22.13			34.34
Low		22.00		26.77		15.73		16.60			15.73
2014	First Quarter		Second Quarter		Third Quarter		Fourth Quarter			Year
Sales	$	577.4	$	570.4	$	593.6	$	499.8		$	2,241.2
Cost of goods sold		475.4		463.6		492.3		421.9			1,853.2
Income from continuing operations		29.5		36.6		26.1		12.8			105.0
Income from discontinued operations, net		—		0.7		—		—			0.7
Net income		29.5		37.3		26.1		12.8			105.7
Basic income per common share:
Income from continuing operations		0.37		0.46		0.33		0.16			1.33
Income from discontinued operations, net		—		0.01		—		—			0.01
Net income		0.37		0.47		0.33		0.16			1.34
Diluted income per common share:
Income from continuing operations		0.37		0.46		0.33		0.16			1.32
Income from discontinued operations, net		—		0.01		—		—			0.01
Net income		0.37		0.47		0.33		0.16			1.33
Common dividends per share		0.20		0.20		0.20		0.20			0.80
Market price of common stock(1)
High		29.18		29.28		28.08		25.97			29.28
Low		24.51		26.42		25.23		20.43			20.43

(1) NYSE composite transactions.

SUPPLEMENTAL GUARANTOR FINANCIAL INFORMATION

The following condensed consolidating guarantor financial information is presented to comply with the requirements of Rule 3-10 of Regulation S-X.

In October 2015, Spinco (the Issuer) issued $720.0 million aggregate principal amount of the 2023 Notes and $500.0 million aggregate principal amount of the 2025 Notes (collectively, the Notes). The Issuer was formed on March 13, 2015 as a wholly owned subsidiary of TDCC 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 December 31, 2015 and 2014, and the related condensed consolidating statements of operations, comprehensive income and cash flows for each of the years in the three-year period ended December 31, 2015 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.

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In April 2015, the FASB issued ASU 2015-03 and, in August 2015, the FASB issued ASU 2015-15 , which both amend ASC 835-30 “Interest—Imputation of Interest.” These updates require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability while debt issuance costs related to line-of-credit arrangements will continue to be presented as an asset. We adopted ASU 2015-03 and ASU 2015-15 on January 1, 2016 which required retrospective application. Historical balance sheet amounts have been adjusted to reflect the adoption of the updates requiring debt issuance costs to be presented as a direct reduction from the carrying value of the related debt.

CONDENSED CONSOLIDATING BALANCE SHEETS

December 31, 2015

(In millions)

	Parent Guarantor			Issuer			Subsidiary Non- Guarantor			Eliminations			Total
Assets
Current assets:
Cash and cash equivalents	$	119.4		$	—		$	272.6		$	—		$	392.0
Receivables, net		107.7			—			679.4			(3.7	)		783.4
Intercompany receivables		—			—			995.0			(995.0	)		—
Income taxes receivable		34.6			—			1.5			(3.2	)		32.9
Inventories		166.0			—			519.2			—			685.2
Current deferred income taxes		—			—			2.7			(2.7	)		—
Other current assets		152.1			5.0			4.6			(121.8	)		39.9
Total current assets		579.8			5.0			2,475.0			(1,126.4	)		1,933.4
Property, plant and equipment, net		508.7			—			3,444.7			—			3,953.4
Investment in Subsidiaries		5,905.0			3,636.3			—			(9,541.3	)		—
Deferred income taxes		—			—			104.6			(8.7	)		95.9
Other assets		43.5			—			411.1			—			454.6
Long-term receivables—affiliates		—			2,562.6			—			(2,562.6	)		—
Intangible assets, net		0.5			—			677.0			—			677.5
Goodwill		—			990.2			1,183.9			—			2,174.1
Total assets	$	7,037.5		$	7,194.1		$	8,296.3		$	(13,239.0	)	$	9,288.9
Liabilities and Shareholders’ Equity
Current liabilities:
Current installments of long-term debt	$	192.8		$	—		$	12.2		$	—		$	205.0
Accounts payable		36.1			—			576.6			(4.5	)		608.2
Intercompany payables		966.0			29.0			—			(995.0	)		—
Income taxes payable		2.7			—			8.1			(5.9	)		4.9
Accrued liabilities		227.8			—			221.3			(121.0	)		328.1
Total current liabilities		1,425.4			29.0			818.2			(1,126.4	)		1,146.2
Long-term debt		1,084.0			2,547.4			12.4			—			3,643.8
Accrued pension liability		484.3			—			164.6			—			648.9
Deferred income taxes		32.5			189.7			881.7			(8.7	)		1,095.2
Long-term payables—affiliates		1,296.4			286.5			979.7			(2,562.6	)		—
Other liabilities		296.1			—			39.9			—			336.0
Total liabilities		4,618.7			3,052.6			2,896.5			(3,697.7	)		6,870.1
Commitments and contingencies
Shareholders’ equity:
Common stock		165.1			—			14.6			(14.6	)		165.1
Additional paid-in capital		2,236.4			4,146.1			4,789.6			(8,935.7	)		2,236.4
Accumulated other comprehensive loss		(492.5	)		—			(31.7	)		31.7			(492.5	)
Retained earnings		509.8			(4.6	)		627.3			(622.7	)		509.8
Total shareholders’ equity		2,418.8			4,141.5			5,399.8			(9,541.3	)		2,418.8
Total liabilities and shareholders’ equity	$	7,037.5		$	7,194.1		$	8,296.3		$	(13,239.0	)	$	9,288.9

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CONDENSED CONSOLIDATING BALANCE SHEETS

December 31, 2014

(In millions)

	Parent Guarantor			Issuer		Subsidiary Non- Guarantor			Eliminations			Total
Assets
Current assets:
Cash and cash equivalents	$	239.4		$	—	$	17.4		$	—		$	256.8
Receivables, net		107.3			—		155.8			—			263.1
Intercompany receivables		—					617.1			(617.1	)		—
Income taxes receivable		21.4			—		0.2			—			21.6
Inventories		136.1			—		74.0			—			210.1
Current deferred income taxes		41.9			—		12.3			—			54.2
Other current assets		99.0			—		1.9			(90.6	)		10.3
Total current assets		645.1			—		878.7			(707.7	)		816.1
Property, plant and equipment, net		505.3			—		425.7			—			931.0
Investment in Subsidiaries		1,683.9			—		—			(1,683.9	)		—
Deferred income taxes		61.2			—		—			(48.7	)		12.5
Other assets		48.4			—		10.6			—			59.0
Intangible assets, net		0.5			—		123.0			—			123.5
Goodwill		—			—		747.1			—			747.1
Total assets	$	2,944.4		$	—	$	2,185.1		$	(2,440.3	)	$	2,689.2
Liabilities and Shareholders’ Equity
Current liabilities:
Current installments of long-term debt	$	4.2		$	—	$	12.2		$	—		$	16.4
Accounts payable		54.0			—		93.4			(0.6	)		146.8
Intercompany payables		617.1					—			(617.1	)		—
Income taxes payable		0.2			—		—			—			0.2
Accrued liabilities		137.0			—		167.3			(90.0	)		214.3
Total current liabilities		812.5			—		272.9			(707.7	)		377.7
Long-term debt		624.9			—		24.9			—			649.8
Accrued pension liability		179.1			—		2.9			—			182.0
Deferred income taxes		—			—		155.8			(48.7	)		107.1
Other liabilities		314.6			—		44.7			—			359.3
Total liabilities		1,931.1			—		501.2			(756.4	)		1,675.9
Commitments and contingencies
Shareholders’ equity:
Common stock		77.4			—		14.6			(14.6	)		77.4
Additional paid-in capital		788.3			—		1,221.2			(1,221.2	)		788.3
Accumulated other comprehensive loss		(443.1	)		—		(19.0	)		19.0			(443.1	)
Retained earnings		590.7			—		467.1			(467.1	)		590.7
Total shareholders’ equity		1,013.3			—		1,683.9			(1,683.9	)		1,013.3
Total liabilities and shareholders’ equity	$	2,944.4		$	—	$	2,185.1		$	(2,440.3	)	$	2,689.2

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CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS

December 31, 2015

(In millions)

	Parent Guarantor			Issuer			Subsidiary Non- Guarantor			Eliminations			Total
Sales	$	1,215.4		$	—		$	2,002.5		$	(363.5	)	$	2,854.4
Operating expenses:
Cost of goods sold		1,057.8			—			1,792.5			(363.5	)		2,486.8
Selling and administration		110.4			—			76.1			—			186.5
Restructuring charges		0.7			—			2.0			—			2.7
Acquisition-related costs		117.9			—			5.5			—			123.4
Other operating (loss) income		(4.0	)		—			49.7			—			45.7
Operating (loss) income		(75.4	)		—			176.1			—			100.7
Earnings of non-consolidated affiliates		1.7			—			—			—			1.7
Equity income (loss) in subsidiaries		90.2			19.7			—			(109.9	)		—
Interest expense		60.9			37.0			4.5			(5.4	)		97.0
Interest income		3.1			—			3.4			(5.4	)		1.1
Other income (expense)		0.4			—			(0.2	)		—			0.2
Income (loss) before taxes		(40.9	)		(17.3	)		174.8			(109.9	)		6.7
Income tax (benefit) provision		(39.5	)		(12.7	)		60.3			—			8.1
Net (loss) income	$	(1.4	)	$	(4.6	)	$	114.5		$	(109.9	)	$	(1.4	)

CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS

December 31, 2014

(In millions)

	Parent Guarantor		Issuer		Subsidiary Non- Guarantor		Eliminations			Total
Sales	$	1,373.2	$	—	$	1,285.5	$	(417.5	)	$	2,241.2
Operating expenses:
Cost of goods sold		1,148.1		—		1,122.6		(417.5	)		1,853.2
Selling and administration		90.8		—		75.4		—			166.2
Restructuring charges		4.8		—		10.9		—			15.7
Acquisition-related costs		4.2		—		—		—			4.2
Other operating income		0.9		—		0.6		—			1.5
Operating income		126.2		—		77.2		—			203.4
Earnings of non-consolidated affiliates		1.7		—		—		—			1.7
Equity income (loss) in subsidiaries		48.8		—		—		(48.8	)		—
Interest expense		47.0		—		1.3		(4.5	)		43.8
Interest income		2.5		—		3.3		(4.5	)		1.3
Other income		0.1		—		—		—			0.1
Income (loss) from continuing operations before taxes		132.3		—		79.2		(48.8	)		162.7
Income tax provision		27.3		—		30.4		—			57.7
Income (loss) from continuing operations		105.0		—		48.8		(48.8	)		105.0
Income from discontinued operations, net		0.7		—		—		—			0.7
Net income (loss)	$	105.7	$	—	$	48.8	$	(48.8	)	$	105.7

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CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS

December 31, 2013

(In millions)

	Parent Guarantor			Issuer		Subsidiary Non- Guarantor			Eliminations			Total
Sales	$	1,379.4		$	—	$	1,569.6		$	(434.0	)	$	2,515.0
Operating expenses:
Cost of goods sold		1,159.3			—		1,308.4			(434.0	)		2,033.7
Selling and administration		132.8			—		57.2			—			190.0
Restructuring charges		5.5			—		—			—			5.5
Acquisition-related costs		—			—		—			—			—
Other operating income		0.6			—		0.1			—			0.7
Operating income		82.4			—		204.1			—			286.5
Earnings of non-consolidated affiliates		2.8			—		—			—			2.8
Equity income (loss) in subsidiaries		129.8			—		—			(129.8	)		—
Interest expense		37.8			—		7.9			(7.1	)		38.6
Interest income		4.4			—		3.3			(7.1	)		0.6
Other (expense) income		(0.1	)		—		(1.2	)		—			(1.3	)
Income (loss) before taxes		181.5			—		198.3			(129.8	)		250.0
Income tax provision		2.9			—		68.5			—			71.4
Net income (loss)	$	178.6		$	—	$	129.8		$	(129.8	)	$	178.6

CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME

December 31, 2015

(In millions)

	Parent Guarantor			Issuer			Subsidiary Non- Guarantor			Eliminations			Total
Net (loss) income	$	(1.4	)	$	(4.6	)	$	114.5		$	(109.9	)	$	(1.4	)
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments, net		(9.8	)		—			(9.8	)		9.8			(9.8	)
Unrealized losses on derivative contracts, net		(2.7	)		—			—			—			(2.7	)
Pension and postretirement liability adjustments, net		(78.8	)		—			(5.1	)		5.1			(78.8	)
Amortization of prior service costs and actuarial losses, net		41.9			—			2.3			(2.3	)		41.9
Total other comprehensive (loss) income, net of tax		(49.4	)		—			(12.6	)		12.6			(49.4	)
Comprehensive (loss) income	$	(50.8	)	$	(4.6	)	$	101.9		$	(97.3	)	$	(50.8	)

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CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME

December 31, 2014

(In millions)

	Parent Guarantor			Issuer		Subsidiary Non- Guarantor			Eliminations			Total
Net income (loss)	$	105.7		$	—	$	48.8		$	(48.8	)	$	105.7
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments, net		(1.8	)		—		(1.8	)		1.8			(1.8	)
Unrealized losses on derivative contracts, net		(5.1	)		—		—			—			(5.1	)
Pension and postretirement liability adjustments, net		(86.6	)		—		(3.2	)		3.2			(86.6	)
Amortization of prior service costs and actuarial losses, net		15.5			—		1.4			(1.4	)		15.5
Total other comprehensive (loss) income, net of tax		(78.0	)		—		(3.6	)		3.6			(78.0	)
Comprehensive income (loss)	$	27.7		$	—	$	45.2		$	(45.2	)	$	27.7

CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME

December 31, 2013

(In millions)

	Parent Guarantor			Issuer		Subsidiary Non- Guarantor			Eliminations			Total
Net income (loss)	$	178.6		$	—	$	129.8		$	(129.8	)	$	178.6
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net		(2.6	)		—		(2.6	)		2.6			(2.6	)
Unrealized losses on derivative contracts, net		(3.8	)		—		—			—			(3.8	)
Pension and postretirement liability adjustments, net		(7.7	)		—		(1.4	)		1.4			(7.7	)
Amortization of prior service costs and actuarial losses, net		20.3			—		1.1			(1.1	)		20.3
Total other comprehensive income (loss), net of tax		6.2			—		(2.9	)		2.9			6.2
Comprehensive income (loss)	$	184.8		$	—	$	126.9		$	(126.9	)	$	184.8

65

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS

December 31, 2015

(In millions)

	Parent Guarantor			Issuer			Subsidiary Non- Guarantor			Eliminations		Total
Net Operating Activities	$	(70.6	)	$	—		$	287.7		$	—	$	217.1
Investing Activities
Capital expenditures		(74.0	)		—			(56.9	)		—		(130.9	)
Business acquired and related transactions, net of cash acquired		(408.1	)		—			—			—		(408.1	)
Proceeds from disposition of property, plant and equipment		1.7			—			24.5			—		26.2
Distributions from affiliated companies, net		8.8			—			—			—		8.8
Net investing activities		(471.6	)		—			(32.4	)		—		(504.0	)
Financing Activities
Long-term debt:
Borrowings		1,275.0			—			—			—		1,275.0
Repayments		(149.5	)		—			(581.2	)		—		(730.7	)
Stock options exercised		2.2			—			—			—		2.2
Excess tax benefits from stock-based compensation		0.4			—			—			—		0.4
Dividends paid		(79.5	)		—			—			—		(79.5	)
Debt and equity issuance costs		(35.2	)		(10.0	)		—			—		(45.2	)
Intercompany financing activities		(591.2	)		10.0			581.2					—
Net financing activities		422.2			—			—			—		422.2
Effect of exchange rate changes on cash and cash equivalents		—			—			(0.1	)		—		(0.1	)
Net (decrease) increase in cash and cash equivalents		(120.0	)		—			255.2			—		135.2
Cash and cash equivalents, beginning of year		239.4			—			17.4			—		256.8
Cash and cash equivalents, end of year	$	119.4		$	—		$	272.6		$	—	$	392.0

66

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS

December 31, 2014

(In millions)

	Parent Guarantor			Issuer		Subsidiary Non- Guarantor			Eliminations		Total
Net Operating Activities	$	134.7		$	—	$	24.5		$	—	$	159.2
Investing Activities
Capital expenditures		(51.3	)		—		(20.5	)		—		(71.8	)
Proceeds from disposition of property, plant and equipment		3.5			—		2.1			—		5.6
Restricted cash activity, net		4.2			—		—			—		4.2
Other investing activities		—			—		0.3			—		0.3
Net investing activities		(43.6	)		—		(18.1	)		—		(61.7	)
Financing Activities
Long-term debt:
Borrowings		150.0			—		—			—		150.0
Repayments		(150.2	)		—		(12.2	)		—		(162.4	)
Earn out payment - SunBelt		—			—		(14.8	)		—		(14.8	)
Common stock repurchased and retired		(64.8	)		—		—			—		(64.8	)
Stock options exercised		6.6			—		—			—		6.6
Excess tax benefits from stock-based compensation		1.1			—		—			—		1.1
Dividends paid		(63.0	)		—		—			—		(63.0	)
Debt and equity issuance costs		(1.2	)		—		—			—		(1.2	)
Intercompany financing activities		(27.0	)		—		27.0			—		—
Net financing activities		(148.5	)		—		—			—		(148.5	)
Net (decrease) increase in cash and cash equivalents		(57.4	)		—		6.4			—		(51.0	)
Cash and cash equivalents, beginning of year		296.8			—		11.0			—		307.8
Cash and cash equivalents, end of year	$	239.4		$	—	$	17.4		$	—	$	256.8

67

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS

December 31, 2013

(In millions)

	Parent Guarantor			Issuer		Subsidiary Non- Guarantor			Eliminations			Total
Net Operating Activities	$	336.9		$	—	$	(19.9	)	$	—		$	317.0
Investing Activities
Capital expenditures		(63.6	)		—		(27.2	)		—			(90.8	)
Proceeds from sale/leaseback of equipment		—			—		35.8			—			35.8
Proceeds from disposition of property, plant and equipment		3.7			—		0.9			—			4.6
Distributions from affiliated companies, net		1.5			—		—			—			1.5
Distributions from consolidated subsidiaries, Net		7.9			—		—			(7.9	)		—
Restricted cash activity, net		7.7			—		—			—			7.7
Other investing activities		—			—		(2.6	)		—			(2.6	)
Net investing activities		(42.8	)		—		6.9			(7.9	)		(43.8	)
Financing Activities
Long-term debt repayments		(11.5	)		—		(12.2	)		—			(23.7	)
Earn out payment - SunBelt		—			—		(17.1	)		—			(17.1	)
Common stock repurchased and retired		(36.2	)		—		—			—			(36.2	)
Stock options exercised		8.8			—		—			—			8.8
Excess tax benefits from stock-based compensation		1.6			—		—			—			1.6
Dividends paid		(64.0	)		—		(7.9	)		7.9			(64.0	)
Intercompany financing activities		(29.3	)		—		29.3			—			—
Net financing activities		(130.6	)		—		(7.9	)		7.9			(130.6	)
Net increase (decrease) in cash and cash equivalents		163.5			—		(20.9	)		—			142.6
Cash and cash equivalents, beginning of year		133.3			—		31.9			—			165.2
Cash and cash equivalents, end of year	$	296.8		$	—	$	11.0		$	—		$	307.8

68

EX-99.2

Exhibit 99.2

OLIN CORPORATION AND CONSOLIDATED SUBSIDIARIES

Condensed Balance Sheets

(In millions, except per share data)

(Unaudited)

	March 31, 2016			December 31, 2015			March 31, 2015
ASSETS
Current assets:
Cash and cash equivalents	$	315.6		$	392.0		$	196.8
Receivables, net		813.2			783.4			303.8
Income taxes receivable		36.3			32.9			15.1
Inventories		679.5			685.2			216.1
Current deferred income taxes		—			—			54.0
Other current assets		32.8			39.9			17.4
Total current assets		1,877.4			1,933.4			803.2
Property, plant and equipment (less accumulated depreciation of $1,587.9, $1,499.4 and $1,357.9)		3,859.0			3,953.4			919.9
Deferred income taxes		107.4			95.9			12.9
Other assets		463.8			454.6			70.2
Intangible assets, net		663.2			677.5			119.8
Goodwill		2,146.1			2,174.1			747.1
Total assets	$	9,116.9		$	9,288.9		$	2,673.1
LIABILITIES AND SHAREHOLDERS’ EQUITY
Current liabilities:
Current installments of long-term debt	$	205.1		$	205.0		$	16.4
Accounts payable		478.1			608.2			147.8
Income taxes payable		14.1			4.9			1.1
Accrued liabilities		352.3			328.1			205.1
Total current liabilities		1,049.6			1,146.2			370.4
Long-term debt		3,627.9			3,643.8			648.7
Accrued pension liability		635.2			648.9			167.2
Deferred income taxes		1,091.0			1,095.2			107.3
Other liabilities		340.4			336.0			361.3
Total liabilities		6,744.1			6,870.1			1,654.9
Commitments and contingencies
Shareholders’ equity:
Common stock, par value $1 per share: authorized, 240.0 shares; issued and outstanding 165.2, 165.1 and 77.5 shares		165.2			165.1			77.5
Additional paid-in capital		2,238.9			2,236.4			792.1
Accumulated other comprehensive loss		(470.2	)		(492.5	)		(439.7	)
Retained earnings		438.9			509.8			588.3
Total shareholders’ equity		2,372.8			2,418.8			1,018.2
Total liabilities and shareholders’ equity	$	9,116.9		$	9,288.9		$	2,673.1

The accompanying notes to condensed financial statements are an integral part of the condensed financial statements.

OLIN CORPORATION AND CONSOLIDATED SUBSIDIARIES

Condensed Statements of Operations

(In millions, except per share data)

(Unaudited)

	Three Months Ended March 31,
	2016			2015
Sales	$	1,348.2		$	518.0
Operating expenses:
Cost of goods sold		1,175.4			433.2
Selling and administration		88.1			47.0
Restructuring charges		92.8			1.2
Acquisition-related costs		10.2			10.4
Other operating income (expense)		10.9			(0.2	)
Operating (loss) income		(7.4	)		26.0
Earnings of non-consolidated affiliates		0.2			0.4
Interest expense		48.5			7.1
Interest income		0.3			0.3
Income (loss) before taxes		(55.4	)		19.6
Income tax (benefit) provision		(17.5	)		6.5
Net (loss) income	$	(37.9	)	$	13.1
Net (loss) income per common share:
Basic	$	(0.23	)	$	0.17
Diluted	$	(0.23	)	$	0.17
Dividends per common share	$	0.20		$	0.20
Average common shares outstanding:
Basic		165.1			77.4
Diluted		165.1			78.5

The accompanying notes to condensed financial statements are an integral part of the condensed financial statements.

2

OLIN CORPORATION AND CONSOLIDATED SUBSIDIARIES

Condensed Statements of Comprehensive Income

(In millions)

(Unaudited)

	Three Months Ended March 31,
	2016			2015
Net (loss) income	$	(37.9	)	$	13.1
Other comprehensive income, net of tax:
Foreign currency translation adjustments, net		15.5			(1.4	)
Unrealized gains (losses) on derivative contracts, net		3.0			(0.3	)
Amortization of prior service costs and actuarial losses, net		3.8			5.1
Total other comprehensive income, net of tax		22.3			3.4
Comprehensive (loss) income	$	(15.6	)	$	16.5

The accompanying notes to condensed financial statements are an integral part of the condensed financial statements.

3

OLIN CORPORATION AND CONSOLIDATED SUBSIDIARIES

Condensed Statements of Shareholders’ Equity

(In millions, except per share data)

(Unaudited)

	Common Stock				Additional Paid—In			Accumulated Other Comprehensive			Retained			Total Shareholders’
	Shares Issued		Par Value		Capital			Loss			Earnings			Equity
Balance at January 1, 2015		77.4	$	77.4	$	788.3		$	(443.1	)	$	590.7		$	1,013.3
Net income		—		—		—			—			13.1			13.1
Other comprehensive income		—		—		—			3.4			—			3.4
Dividends paid:
Common stock ($0.20 per share)		—		—		—			—			(15.5	)		(15.5	)
Common stock issued for:
Stock options exercised		0.1		0.1		2.7			—			—			2.8
Other transactions		—		—		(0.2	)		—			—			(0.2	)
Stock-based compensation		—		—		1.3			—			—			1.3
Balance at March 31, 2015		77.5	$	77.5	$	792.1		$	(439.7	)	$	588.3		$	1,018.2
Balance at January 1, 2016		165.1	$	165.1	$	2,236.4		$	(492.5	)	$	509.8		$	2,418.8
Net loss		—		—		—			—			(37.9	)		(37.9	)
Other comprehensive income		—		—		—			22.3			—			22.3
Dividends paid:
Common stock ($0.20 per share)		—		—		—			—			(33.0	)		(33.0	)
Common stock issued for:
Other transactions		0.1		0.1		0.9			—			—			1.0
Stock-based compensation		—		—		1.6			—			—			1.6
Balance at March 31, 2016		165.2	$	165.2	$	2,238.9		$	(470.2	)	$	438.9		$	2,372.8

The accompanying notes to condensed financial statements are an integral part of the condensed financial statements.

4

OLIN CORPORATION AND CONSOLIDATED SUBSIDIARIES

Condensed Statements of Cash Flows

(In millions)

(Unaudited)

	Three Months Ended March 31,
	2016			2015
Operating Activities
Net (loss) income	$	(37.9	)	$	13.1
Adjustments to reconcile net (loss) income to net cash and cash equivalents provided by (used for) operating activities:
Earnings of non-consolidated affiliates		(0.2	)		(0.4	)
Losses on disposition of property, plant and equipment		0.2			0.3
Stock-based compensation		2.2			1.8
Depreciation and amortization		129.7			34.4
Deferred income taxes		(14.7	)		(3.1	)
Write-off of equipment and facility included in restructuring charges		76.6			—
Qualified pension plan contributions		(0.5	)		(0.2	)
Qualified pension plan income		(9.0	)		(6.8	)
Change in:
Receivables		(16.8	)		(40.7	)
Income taxes receivable/payable		5.6			7.4
Inventories		6.3			(6.0	)
Other current assets		6.5			(7.1	)
Accounts payable and accrued liabilities		(99.7	)		(6.3	)
Other assets		2.1			0.1
Other noncurrent liabilities		(0.3	)		2.4
Other operating activities		(3.1	)		1.5
Net operating activities		47.0			(9.6	)
Investing Activities
Capital expenditures		(76.1	)		(23.3	)
Proceeds from disposition of property, plant and equipment		0.1			0.6
Proceeds from disposition of affiliated companies		2.2			2.2
Other investing activities		—			(1.4	)
Net investing activities		(73.8	)		(21.9	)
Financing Activities
Long-term debt repayments		(17.1	)		(1.0	)
Stock options exercised		—			2.0
Excess tax benefits from stock-based compensation		—			0.3
Dividends paid		(33.0	)		(15.5	)
Debt and equity issuance costs		—			(14.3	)
Net financing activities		(50.1	)		(28.5	)
Effect of exchange rate changes on cash and cash equivalents		0.5			—
Net decrease in cash and cash equivalents		(76.4	)		(60.0	)
Cash and cash equivalents, beginning of period		392.0			256.8
Cash and cash equivalents, end of period	$	315.6		$	196.8
Cash paid for interest and income taxes:
Interest	$	17.3		$	6.6
Income taxes, net of refunds	$	3.6		$	1.6
Non-cash investing activities:
Capital expenditures included in accounts payable and accrued liabilities	$	2.1		$	2.4

The accompanying notes to condensed financial statements are an integral part of the condensed financial statements.

5

OLIN CORPORATION AND CONSOLIDATED SUBSIDIARIES

Notes to Condensed Financial Statements

(Unaudited)

DESCRIPTION OF BUSINESS

Olin Corporation (Olin) is a Virginia corporation, incorporated in 1892, having its principal executive offices in Clayton, MO. On October 5, 2015 (the Closing Date), we acquired from The Dow Chemical Company (TDCC) 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. For segment reporting purposes, a portion of the Acquired Business’s operating results comprise the newly created Epoxy segment with the remaining operating results combined with Olin’s former Chlor Alkali Products and Chemical Distribution segments to comprise the newly created Chlor Alkali Products and Vinyls segment.

We are a manufacturer concentrated in three business segments: Chlor Alkali Products and Vinyls, Epoxy and Winchester. Chlor Alkali Products and Vinyls manufactures and sells chlorine and caustic soda, ethylene dichloride 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 and downstream products such as converted epoxy resins and additives. The Winchester segment products include 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 consolidated 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, 2015. Certain reclassifications were made to prior year amounts to conform to the 2016 presentation.

ACQUISITION

On the Closing Date, Olin consummated the previously announced merger (the Merger), using a Reverse Morris Trust structure, of our wholly owned subsidiary, Blue Cube Acquisition Corp. (Merger Sub), with and into Blue Cube Spinco Inc. (Spinco), with Spinco as the surviving corporation and a wholly owned subsidiary of Olin, as contemplated by the Agreement and Plan of Merger (the Merger Agreement) dated March 26, 2015, among Olin, TDCC, Merger Sub and Spinco (collectively, the Acquisition). Pursuant to the Merger Agreement and a Separation Agreement dated March 26, 2015 between TDCC and Spinco (the Separation Agreement), prior to the Merger, (1) TDCC transferred the Acquired Business to Spinco and (2) TDCC distributed Spinco’s stock to TDCC’s shareholders by way of a split-off (the Distribution).

6

Upon consummation of the transactions contemplated by the Merger Agreement and the Separation Agreement (the Transactions), the shares of Spinco common stock then outstanding were automatically converted into the right to receive approximately 87.5 million shares of Olin common stock, which were issued by Olin on the Closing Date, and represented approximately 53% of the outstanding shares of Olin common stock, together with cash in lieu of fractional shares. Olin’s pre-Merger shareholders continued to hold the remaining approximately 47% of the outstanding shares of Olin common stock. On the Closing Date, Spinco became a wholly owned subsidiary of Olin.

The following table summarizes the aggregate purchase price for the Acquired Business and related transactions, after the final post-closing adjustments:

	October 5, 2015
	(In millions, except per share data)
Shares		87.5
Value of common stock on October 2, 2015		17.46
Equity consideration by exchange of shares	$	1,527.4
Cash and debt instruments received by TDCC		2,095.0
Accrual for future payments		69.5
Up-front payments under the ethylene agreements		433.5
Total cash, debt and equity consideration	$	4,125.4
Long-term debt assumed		569.0
Pension liabilities assumed		442.3
Aggregate purchase price	$	5,136.7

The value of the common stock was based on the closing stock price on the last trading day prior to the Closing Date. The aggregate purchase price was adjusted for the final working capital adjustment and the final valuation for the pension liabilities assumed from TDCC.

In connection with the Acquisition, TDCC retained liabilities relating to the Acquired Business for litigation, releases of hazardous materials and violations of environmental law to the extent arising prior to the Closing Date.

For the three months ended March 31, 2016 and 2015, we incurred costs related to the Acquisition of $10.2 million and $10.4 million, respectively, which consisted of advisory, legal, accounting, integration and other professional fees. For the three months ended March 31, 2015, we incurred $0.4 million of financing-related fees.

For segment reporting purposes, the Acquired Business’s Global Epoxy operating results comprise the newly created Epoxy segment and U.S. Chlor Alkali and Vinyl and Global Chlorinated Organics (Acquired Chlor Alkali Business) operating results combined with our former Chlor Alkali Products and Chemical Distribution segments to comprise the newly created Chlor Alkali Products and Vinyls segment. The Acquired Business’s results of operations have been included in our consolidated results for the period subsequent to the Closing Date. Our results for the three months ended March 31, 2016 include Epoxy sales of $460.2 million and segment income of $8.2 million and Chlor Alkali Products and Vinyls include sales of the Acquired Chlor Alkali Business of $395.9 million and segment income of $56.3 million.

The Transactions have been accounted for using the acquisition method of accounting which requires, among other things, that assets acquired and liabilities assumed be recognized at their fair values as of the acquisition date. As of March 31, 2016, we are continuing the process of determining the fair values of the Acquired Business’s tangible and intangible assets and liabilities. The purchase price allocation is preliminary until we complete our assessment. The following recognized amounts are subject to change:

• amounts for certain balances included in working capital pending receipt of certain information that could affect provisional amounts recorded;

7

• amounts for intangible assets and property, plant and equipment, pending finalization of valuation efforts as well as the completion of procedures confirming the existence and condition of certain property, plant and equipment assets;

• amounts for income tax liabilities, pending finalization of estimates and assumptions in respect of certain tax aspects of the transaction; and

• amount of goodwill pending the completion of the valuation of the assets acquired and liabilities assumed.

We will finalize the amounts recognized as we obtain the information necessary to complete the analyses. We expect to finalize these amounts as soon as possible but no later than one year from the acquisition date. The following table summarizes the preliminary allocation of the purchase price to the Acquired Business’s assets and liabilities on the Closing Date:

	Initial Valuation		Measurement Period Adjustments			As of March 31, 2016
	($ in millions)
Total current assets	$	921.7	$	(2.9	)	$	918.8
Property, plant and equipment		3,090.8		—			3,090.8
Deferred taxes		76.8		—			76.8
Intangible assets		582.3		—			582.3
Other assets		426.5		6.2			432.7
Total assets acquired		5,098.1		3.3			5,101.4
Total current liabilities		357.6		(6.2	)		351.4
Long-term debt		517.9		—			517.9
Accrued pension liability		447.1		(4.8	)		442.3
Deferred tax liability		1,054.9		—			1,054.9
Other liabilities		2.0		6.2			8.2
Total liabilities assumed		2,379.5		(4.8	)		2,374.7
Net identifiable assets acquired		2,718.6		8.1			2,726.7
Goodwill		1,427.5		(28.8	)		1,398.7
Fair value of net assets acquired	$	4,146.1	$	(20.7	)	$	4,125.4

Measurement period adjustments for the three months ended March 31, 2016 primarily consisted of the final working capital adjustment and the final valuation for the pension liabilities assumed from TDCC. Included in total current assets are cash and cash equivalents of $25.4 million, inventories of $477.1 million and receivables of $416.0 million with a contracted value of $420.6 million. Included in total current liabilities are current installments of long-term debt of $51.1 million.

Based on preliminary valuations, purchase price was allocated to intangible assets as follows:

	October 5, 2015
	Weighted-Average Amortization Period	Gross Amount
		($ in millions)
Customers, customer contracts and relationships	15 Years	$	490.3
Acquired technology	7 Years		85.0
Trade name	Indefinite		7.0
Total acquired intangible assets		$	582.3

8

Based on preliminary valuations as of March 31, 2016, $1,398.7 million was assigned to goodwill, none of which is deductible for tax purposes. The primary reasons for the Acquisition and the principal factors that contributed to the Acquired Business purchase price that resulted in the recognition of goodwill are due to the providing of increased production capacity and diversification of Olin’s product portfolio, cost-saving opportunities and enhanced size and geographic presence. The cost-saving opportunities include improved operating efficiencies and asset optimization.

Goodwill recorded in the Acquisition is not amortized but will be reviewed for impairment annually in the fourth quarter and/or when circumstances or other events indicate that impairment may have occurred.

Transaction financing

Prior to the Distribution, TDCC received from Spinco distributions of cash and debt instruments of Spinco with an aggregate value of $2,095.0 million (collectively, the Cash and Debt Distribution). On the Closing Date, Spinco 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 10.0% senior notes due October 15, 2025 (2025 Notes and, together with the 2023 Notes, the Notes) to TDCC. TDCC transferred the Notes to certain unaffiliated securityholders in satisfaction of existing debt obligations of TDCC held or acquired by those unaffiliated securityholders. On October 5, 2015, certain initial purchasers purchased the Notes from the unaffiliated securityholders. Interest on the Notes began accruing from October 1, 2015 and will be paid semi-annually beginning on April 15, 2016. The Notes are not redeemable at any time prior to October 15, 2020. Neither Olin nor Spinco received any proceeds from the sale of the Notes. Upon the consummation of the Transactions, Olin became guarantor of the Notes.

On June 23, 2015, Spinco entered into a new five-year delayed-draw term loan facility of up to $1,050.0 million. As of the Closing Date, Spinco drew $875.0 million to finance the cash portion of the Cash and Debt Distribution. Also on June 23, 2015, Olin and Spinco entered into a new five-year $1,850.0 million senior credit facility consisting of a $500.0 million senior revolving credit facility, which replaced Olin’s $265.0 million senior revolving credit facility at the closing of the Merger, and a $1,350.0 million (subject to reduction by the aggregate amount of the term loans funded to Spinco under the Spinco term loan facility) delayed-draw term loan facility. As of the Closing Date, an additional $475.0 million was drawn by Olin under this term loan facility which was used to pay fees and expenses of the Transactions, obtain additional funds for general corporate purposes and refinance Olin’s existing senior term loan facility due in 2019. Subsequent to the Closing Date, these senior credit facilities were consolidated into a single $1,850.0 million senior credit facility, which includes a $1,350.0 million term loan facility. This new senior credit facility will expire in 2020. The $500.0 million senior revolving credit facility includes a $100.0 million letter of credit subfacility. The term loan facility includes amortization payable in equal quarterly installments at a rate of 5.0% per annum for the first two years, increasing to 7.5% per annum for the following year and to 10.0% per annum for the last two years. Under the new senior credit facility, we may select various floating rate borrowing options. The actual interest rate paid on borrowings under the senior credit facility is based on a pricing grid which is dependent upon the leverage ratio as calculated under the terms of the facility for the prior fiscal quarter. The facility includes various customary restrictive covenants, including restrictions related to the ratio of debt to earnings before interest expense, taxes, depreciation and amortization (leverage ratio) and the ratio of earnings before interest expense, taxes, depreciation and amortization to interest expense (coverage ratio). Compliance with these covenants is determined quarterly based on the operating cash flows.

On August 25, 2015, Olin entered into a Credit Agreement (the Credit Agreement) with a syndicate of lenders and Sumitomo Mitsui Banking Corporation, as administrative agent, in connection with the Transactions. The Credit Agreement provides for a term credit facility (the Sumitomo Credit Facility) under which Olin obtained term loans in an aggregate amount of $600.0 million.

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On November 3, 2015, we entered into an amendment to the Sumitomo Credit Facility which increased the aggregate amount of term loans available by $200.0 million. On the Closing Date, $600.0 million of loans under the Credit Agreement were made available and borrowed upon and on November 5, 2015, $200.0 million of loans under the Credit Agreement were made available and borrowed upon. The term loans under the Sumitomo Credit Facility will mature on October 5, 2018 and will have no scheduled amortization payments. The proceeds of the Sumitomo Credit Facility were used to refinance existing Spinco indebtedness outstanding at the Closing Date, to pay fees and expenses in connection with the Transactions and for general corporate purposes. The Credit Agreement contains customary representations, warranties and affirmative and negative covenants which are substantially similar to those included in the new $1,850.0 million senior credit facility.

On March 26, 2015, we and certain financial institutions executed commitment letters pursuant to which the financial institutions agreed to provide $3,354.5 million of financing to Spinco to finance the amount of the Cash and Debt Distribution and to provide financing, if needed, to Olin to refinance certain of our existing debt (the Bridge Financing), in each case on the terms and conditions set forth in the commitment letters. The Bridge Financing was not drawn on to facilitate the Transactions, and the commitments for the Bridge Financing were terminated as of the Closing Date. For the three months ended March 31, 2015, we paid deferred debt issuance costs of $14.3 million associated with the Bridge Financing.

Other acquisition-related transactions

In connection with the Transactions, certain additional agreements have been entered into, including, among others, an Employee Matters Agreement, a Tax Matters Agreement, site, transitional and other services agreements, supply and purchase agreements, real estate agreements, technology licenses and intellectual property agreements. Payments of approximately $69.5 million will be made related to certain acquisition-related liabilities including the final working capital adjustment.

In addition, Olin and TDCC have agreed to enter into arrangements for the long-term supply of ethylene by TDCC to Olin, pursuant to which, among other things, Olin has made upfront payments of $433.5 million upon the closing of the Merger in order to receive ethylene at producer economics and for certain reservation fees for the option to obtain additional future ethylene supply at producer economics. The fair value of the long-term supply contracts recorded as of the Closing Date was a long-term asset of $410.8 million which will be amortized over the life of the contracts as ethylene is received. If the options are exercised by us, additional payments will be made to TDCC of between $205 million and $215 million in 2017 and between $425 million and $465 million in 2020, which will increase the value of the long-term asset.

In connection with the Transactions and effective October 1, 2015, we filed a Certificate of Amendment to our Articles of Incorporation to increase the number of authorized shares of Olin common stock from 120.0 million shares to 240.0 million shares.

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Pro forma financial information

The following pro forma summary reflects consolidated results of operation as if the Acquisition had occurred on January 1, 2014 (unaudited).

	Three Months Ended March 31, 2015
	(In millions, except per share data)
Sales	$	1,439.0
Net loss		(39.5	)
Net loss per common share:
Basic	$	(0.24	)
Diluted	$	(0.24	)

The pro forma financial information was prepared based on historical financial information and has been adjusted to give effect to pro forma adjustments that are (i) directly attributable to the Transactions, (ii) factually supportable and (iii) expected to have a continuing impact on the combined results. The pro forma statement of income uses estimates and assumptions based on information available at the time. Management believes the estimates and assumptions to be reasonable; however, actual results may differ significantly from this pro forma financial information. The pro forma results presented do not include any anticipated synergies or other expected benefits that may be realized from the Transactions. The pro forma information is not intended to reflect the actual results that would have occurred had the companies actually been combined during the period presented.

The pro forma results for the three months ended March 31, 2015 primarily include recurring adjustments for re-pricing of sales, raw materials and services to/from TDCC relating to arrangements for long-term supply agreements for the sale of raw materials, including ethylene and benzene, and services pursuant to the Separation Agreement, adjustments to eliminate historical sales between the Acquired Business and Olin, additional amortization expense related to the fair value of acquired identifiable intangible assets, additional depreciation expense related to the fair value adjustment to property, plant and equipment, interest expense related to the incremental debt issued in conjunction with the Acquisition and an adjustment to tax-effect the aforementioned pro forma adjustments using an estimated aggregate statutory income tax rate of the jurisdictions to which the above adjustments relate.

In addition to the above recurring adjustments, the pro forma results for the three months ended March 31, 2015 included non-recurring adjustments of $10.4 million relating to the elimination of transaction costs incurred that are directly related to the Transactions, and do not have a continuing impact on our combined operating results.

RESTRUCTURING CHARGES

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 will reconfigure 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. This 220,000 ton reduction was entirely from diaphragm cell capacity. For the three months ended March 31, 2016, we recorded pretax restructuring charges of $92.2 million for the write-off of equipment and facility costs, lease and other contract termination costs, employee severance and related benefit costs, employee relocation costs and facility exit costs related to these actions. We expect to incur additional restructuring charges through 2020 of approximately $45 million related to these capacity reductions.

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On December 12, 2014, we announced that we had made the decision to permanently close the portion of the Becancour, Canada chlor alkali facility that has been shut down since late June 2014. This action reduced the facility’s chlor alkali capacity by 185,000 tons. Subsequent to the shut down, the plant predominantly focuses on bleach and hydrochloric acid, which are value-added products, as well as caustic soda. For the three months ended March 31, 2016 and 2015, we recorded pretax restructuring charges of $0.3 million and $1.2 million, respectively, for the write-off of equipment and facility costs, lease and other contract termination costs, facility exit costs and employee severance and related benefit costs related to these actions. We expect to incur additional restructuring charges through 2017 of approximately $4 million related to the shut down of this portion of the facility.

On November 3, 2010, we announced that we made the decision to relocate the Winchester centerfire pistol and rifle ammunition manufacturing operations from East Alton, IL to Oxford, MS. This relocation, when completed, is forecast to reduce Winchester’s annual operating costs by approximately $35 million to $40 million. Consistent with this decision we initiated an estimated $110 million five-year project, which includes approximately $80 million of capital spending. The capital spending was partially financed by $31 million of grants provided by the State of Mississippi and local governments. We currently expect to complete this relocation in the first half of 2016. For the three months ended March 31, 2016 and 2015, we recorded pretax restructuring charges of $0.3 million and less than $0.1 million, respectively, for employee severance and related benefit costs, employee relocation costs and facility exit costs related to these actions. We expect to incur additional restructuring charges through 2016 of approximately $1 million related to the transfer of these operations.

The following table summarizes the activity by major component of these 2016, 2014 and 2010 restructuring actions and the remaining balances of accrued restructuring costs as of March 31, 2016:

	Employee severance and job related benefits			Lease and other contract termination costs			Employee relocation costs			Facility exit costs			Write-off of equipment and facility			Total
	($ in millions)
Balance at January 1, 2015	$	11.2		$	4.5		$	—		$	—		$	—		$	15.7
Restructuring charges		—			0.7			0.1			0.2			0.2			1.2
Amounts utilized		(2.8	)		—			(0.1	)		(0.2	)		(0.2	)		(3.3	)
Currency translation adjustments		(0.4	)		(0.3	)		—			—			—			(0.7	)
Balance at March 31, 2015	$	8.0		$	4.9		$	—		$	—		$	—		$	12.9
Balance at January 1, 2016	$	4.6		$	2.1		$	—		$	—		$	—		$	6.7
Restructuring charges		3.9			9.2			0.2			2.9			76.6			92.8
Amounts utilized		(1.7	)		(0.1	)		(0.2	)		(0.6	)		(76.6	)		(79.2	)
Currency translation adjustments		0.1			0.1			—			—			—			0.2
Balance at March 31, 2016	$	6.9		$	11.3		$	—		$	2.3		$	—		$	20.5

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The following table summarizes the cumulative restructuring charges of these 2016, 2014 and 2010 restructuring actions by major component through March 31, 2016:

	Chlor Alkali Products and Vinyls
	Becancour		Capacity Reductions		Winchester		Total
	($ in millions)
Write-off of equipment and facility	$	3.5	$	76.6	$	—	$	80.1
Employee severance and job related benefits		2.7		3.9		13.1		19.7
Facility exit costs		0.9		2.5		2.3		5.7
Pension and other postretirement benefits curtailment		—		—		4.1		4.1
Employee relocation costs		—		—		5.5		5.5
Lease and other contract termination costs		5.2		9.2		—		14.4
Total cumulative restructuring charges	$	12.3	$	92.2	$	25.0	$	129.5

As of March 31, 2016, we have incurred cash expenditures of $23.8 million and non-cash charges of $84.6 million related to these restructuring actions. The remaining balance of $20.5 million is expected to be paid out through 2020.

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,
	2016			2015
	($ in millions)
Balance at beginning of year	$	6.4		$	3.0
Provisions charged		1.4			0.2
Write-offs, net of recoveries		(1.5	)		(0.1	)
Balance at end of period	$	6.3		$	3.1

INVENTORIES

Inventories consisted of the following:

	March 31, 2016			December 31, 2015			March 31, 2015
	($ in millions)
Supplies	$	73.7		$	86.5		$	40.2
Raw materials		88.0			91.5			63.6
Work in process		108.1			105.8			37.2
Finished goods		452.2			445.3			141.1
		722.0			729.1			282.1
LIFO reserve		(42.5	)		(43.9	)		(66.0	)
Inventories, net	$	679.5		$	685.2		$	216.1

In conjunction with the Acquisition, we obtained inventories with a fair value of $477.1 million as of October 5, 2015. Inventories are valued at the lower of cost or market. For U.S. inventories, inventory costs are determined principally by the dollar value 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.

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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, 2016 reflect certain estimates relating to inventory quantities and costs at December 31, 2016. The replacement cost of our inventories would have been approximately $42.5 million, $43.9 million and $66.0 million higher than reported at March 31, 2016, December 31, 2015 and March 31, 2015, respectively.

OTHER ASSETS

Included in other assets were the following:

	March 31, 2016		December 31, 2015		March 31, 2015
	($ in millions)
Investments in non-consolidated affiliates	$	25.2	$	25.0	$	23.7
Deferred debt issuance costs		3.1		3.3		15.1
Bleach joint venture receivable		—		—		5.8
Tax-related receivables		14.4		1.5		6.6
Interest rate swaps		—		—		2.9
Supply contracts		402.2		406.5		—
Other		18.9		18.3		16.1
Other assets	$	463.8	$	454.6	$	70.2

In connection with the Acquisition, Olin and TDCC have agreed to enter into arrangements for the long-term supply of ethylene by TDCC to Olin, pursuant to which, among other things, Olin has made upfront payments of $433.5 million upon the Closing Date in order to receive ethylene at producer economics and for certain reservation fees for the option to obtain additional future ethylene supply at producer economics. The fair value of the long-term supply contracts recorded as of the Closing Date was a long-term asset of $410.8 million which will be amortized over the life of the contracts as ethylene is received. If the options are exercised by us, additional payments will be made to TDCC of between $205 million and $215 million in 2017 and between $425 million and $465 million in 2020, which will increase the value of the long-term asset. Amortization expense of $4.3 million was recognized within cost of goods sold for the three months ended March 31, 2016 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 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, 2015	$	747.1		$	—		$	747.1
Acquisition activity		—			—			—
Balance at March 31, 2015	$	747.1		$	—		$	747.1
Balance at January 1, 2016	$	1,877.5		$	296.6		$	2,174.1
Acquisition activity		(23.3	)		(5.5	)		(28.8	)
Foreign currency translation adjustment		0.6			0.2			0.8
Balance at March 31, 2016	$	1,854.8		$	291.3		$	2,146.1

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Intangible assets consisted of the following:

	March 31, 2016							December 31, 2015							March 31, 2015
	Gross Amount		Accumulated Amortization			Net		Gross Amount		Accumulated Amortization			Net		Gross Amount		Accumulated Amortization			Net
	($ in millions)
Customers, customer contracts and relationships	$	643.8	$	(75.9	)	$	567.9	$	641.0	$	(64.0	)	$	577.0	$	152.9	$	(44.7	)	$	108.2
Trade name		17.9		(2.7	)		15.2		17.9		—			17.9		10.9		—			10.9
Acquired technology		85.2		(5.7	)		79.5		84.7		(2.7	)		82.0		—		—			—
Other		2.3		(1.7	)		0.6		2.3		(1.7	)		0.6		2.3		(1.6	)		0.7
Total intangible assets	$	749.2	$	(86.0	)	$	663.2	$	745.9	$	(68.4	)	$	677.5	$	166.1	$	(46.3	)	$	119.8

In conjunction with the Acquisition, we obtained intangible assets with a fair value of $582.3 million as of October 5, 2015.

Intangible assets with indefinite useful lives are reviewed annually in the fourth quarter and/or when circumstances or other events indicate the indefinite life is no longer supportable. In connection with the integration of the Acquired Business, in the first quarter of 2016, the KA Steel trade name was changed from an indefinite life intangible asset to an intangible asset with a finite useful life of one year. Amortization expense of $2.7 million was recognized within cost of goods sold for the three months ended March 31, 2016 related to the change in useful life.

EARNINGS PER SHARE

Basic and diluted net (loss) income per share are computed by dividing net (loss) income by the weighted average number of common shares outstanding. Diluted net (loss) income per share reflects the dilutive effect of stock-based compensation.

	Three Months Ended March 31,
	2016			2015
	(In millions, except per share data)
Computation of Income (Loss) per Share
Net (loss) income	$	(37.9	)	$	13.1
Basic shares		165.1			77.4
Basic net (loss) income per share	$	(0.23	)	$	0.17
Diluted shares:
Basic shares		165.1			77.4
Stock-based compensation		—			1.1
Diluted shares		165.1			78.5
Diluted net (loss) income per share	$	(0.23	)	$	0.17

The computation of dilutive shares from stock-based compensation does not include 7.0 million shares and 1.4 million shares for the three months ended March 31, 2016 and 2015, respectively, as their effect would have been anti-dilutive.

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ENVIRONMENTAL

We are party to various government and private environmental actions associated with past manufacturing facilities and former waste disposal sites. Charges to income for investigatory and remedial efforts were material to operating results in 2015 and are expected to be material in 2016. The condensed balance sheets included reserves for future environmental expenditures to investigate and remediate known sites amounting to $139.2 million, $138.1 million and $136.0 million at March 31, 2016, December 31, 2015 and March 31, 2015, respectively, of which $120.2 million, $119.1 million and $117.0 million, respectively, were classified as other noncurrent liabilities.

Environmental provisions charged to income, which are included in cost of goods sold, were $2.7 million and $0.7 million for the three months ended March 31, 2016 and 2015, respectively.

In connection with the Acquisition, TDCC retained liabilities relating to releases of hazardous materials and violations of environmental law to the extent arising prior to the Closing Date.

Environmental exposures are difficult to assess for numerous reasons, including the identification of new sites, developments at sites resulting from investigatory studies, advances in technology, changes in environmental laws and regulations and their application, changes in regulatory authorities, the scarcity of reliable data pertaining to identified sites, the difficulty in assessing the involvement and financial capability of other potentially responsible parties (PRPs), our ability to obtain contributions from other parties and the lengthy time periods over which site remediation occurs. It is possible that some of these matters (the outcomes of which are subject to various uncertainties) may be resolved unfavorably to us, which could materially adversely affect our financial position or results of operations.

COMMITMENTS AND CONTINGENCIES

We, and our subsidiaries, are defendants in various legal actions (including proceedings based on alleged exposures to asbestos) incidental to our past and current business activities. As of March 31, 2016, December 31, 2015 and March 31, 2015, our condensed balance sheets included liabilities for these legal actions of $22.1 million, $21.2 million and $22.4 million, respectively. These liabilities do not include costs associated with legal representation. Based on our analysis, and considering the inherent uncertainties associated with litigation, we do not believe that it is reasonably possible that these legal actions will materially adversely affect our financial position, cash flows or results of operations. In connection with the Acquisition, TDCC retained liabilities related to litigation to the extent arising prior to the Closing Date.

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 Accounting Standards Codification (ASC) 450 “Contingencies” (ASC 450) and, therefore, do not record gain contingencies and recognize income until it is earned and realizable.

For the three months ended March 31, 2016, we recognized an insurance recovery of $11.0 million in other operating income (expense) for property damage and business interruption related to a 2008 chlor alkali facility incident.

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SHAREHOLDERS’ EQUITY

On April 24, 2014, our board of directors authorized a share repurchase program for up to 8 million shares of common stock that will terminate in three years for any of the remaining shares not yet repurchased. For the three months ended March 31, 2016 and 2015, no shares were purchased and retired. As of March 31, 2016, we had purchased a total of 1.9 million shares under the April 2014 program, and 6.1 million shares remained authorized to be purchased. Under the Merger Agreement relating to the Acquisition, we were restricted from repurchasing shares of our common stock prior to the consummation of the Merger. For a period of two years subsequent to the Closing Date of the Merger, we will continue to be subject to certain restrictions on our ability to conduct share repurchases.

We issued 0.1 million shares representing stock options exercised for the three months ended March 31, 2015, with a total value of $2.8 million.

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 Postretirement Benefits (net of taxes)			Accumulated Other Comprehensive Loss
	($ in millions)
Balance at January 1, 2015	$	(2.3	)	$	(4.2	)	$	(436.6	)	$	(443.1	)
Unrealized losses		(1.4	)		(2.4	)		—			(3.8	)
Reclassification adjustments into income		—			1.9			8.6			10.5
Tax benefit (provision)		—			0.2			(3.5	)		(3.3	)
Net Change		(1.4	)		(0.3	)		5.1			3.4
Balance at March 31, 2015	$	(3.7	)	$	(4.5	)	$	(431.5	)	$	(439.7	)
Balance at January 1, 2016	$	(12.1	)	$	(6.9	)	$	(473.5	)	$	(492.5	)
Unrealized gains		24.0			1.1			—			25.1
Reclassification adjustments into income		—			3.7			6.1			9.8
Tax provision		(8.5	)		(1.8	)		(2.3	)		(12.6	)
Net Change		15.5			3.0			3.8			22.3
Balance at March 31, 2016	$	3.4		$	(3.9	)	$	(469.7	)	$	(470.2	)

Net (loss) income and cost of goods sold included reclassification adjustments for realized gains and losses on derivative contracts from accumulated other comprehensive loss.

Net (loss) income, cost of goods sold and selling and administrative expenses included the amortization of prior service costs and actuarial losses from accumulated other comprehensive loss. This amortization is recognized equally in cost of goods sold and selling and administrative expenses.

SEGMENT INFORMATION

We define segment results as income (loss) before interest expense, interest income, other operating income (expense), and income taxes, and include the operating results of non-consolidated affiliates. Consistent with the guidance in ASC 280 “Segment Reporting” (ASC 280), we have determined it is appropriate to include the operating results of non-consolidated affiliates in the relevant segment financial results. Beginning in the fourth quarter of 2015, we modified our reportable segments due to changes in our organization resulting from the Acquisition. We have three operating segments: Chlor Alkali Products and Vinyls, Epoxy and Winchester. For segment reporting purposes, the Acquired Business’s Global Epoxy operating results comprise the newly created Epoxy segment and the Acquired Chlor Alkali Business operating results combined with our former Chlor Alkali Products and Chemical Distribution segments comprise the newly created Chlor Alkali Products and Vinyls segment.

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The new reporting structure has been retrospectively applied to the financial results for all periods presented. 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.

	Three Months Ended March 31,
	2016			2015
	($ in millions)
Sales:
Chlor Alkali Products and Vinyls	$	704.3		$	339.3
Epoxy		460.2			—
Winchester		183.7			178.7
Total sales	$	1,348.2		$	518.0
Income (loss) before taxes:
Chlor Alkali Products and Vinyls	$	68.1		$	24.1
Epoxy		8.2			—
Winchester		28.7			29.8
Corporate/other:
Pension income		12.2			7.1
Environmental expense		(2.7	)		(0.7	)
Other corporate and unallocated costs		(29.6	)		(22.1	)
Restructuring charges		(92.8	)		(1.2	)
Acquisition-related costs		(10.2	)		(10.4	)
Other operating income (expense)		10.9			(0.2	)
Interest expense		(48.5	)		(7.1	)
Interest income		0.3			0.3
Income (loss) before taxes	$	(55.4	)	$	19.6

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,
	2016		2015
	($ in millions)
Stock-based compensation	$	4.4	$	2.5
Mark-to-market adjustments		0.4		5.2
Total expense	$	4.8	$	7.7

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	2016			2015
Dividend yield		6.09	%		2.92	%
Risk-free interest rate		1.35	%		1.69	%
Expected volatility		32	%		34	%
Expected life (years)		6.0			6.0
Weighted average grant fair value (per option)	$	1.90		$	6.80
Weighted average exercise price	$	13.14		$	27.40
Shares granted		1,670,400			776,750

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Dividend yield for 2016 and 2015 was based on a historical average. 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.

PENSION PLANS AND RETIREMENT BENEFITS

Most of our employees participate in defined contribution pension plans. We provide a contribution to an individual retirement contribution account maintained with the Contributing Employee Ownership Plan (CEOP) primarily equal to an amount of between 5% and 10% of the employee’s eligible compensation. The defined contribution pension plans expense was $6.6 million and $4.3 million for the three months ended March 31, 2016 and 2015, respectively.

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 statutory practices. Our 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 health care (medical) and life insurance benefits for eligible active and retired domestic employees. The health care plans are contributory with participants’ contributions adjusted annually based on medical rates of inflation and plan experience.

Effective as of the Closing Date, we changed the approach used to measure service and interest costs for our defined benefit pension plans and on December 31, 2015 changed this approach for our other postretirement benefits. Prior to the change, we measured service and interest costs utilizing a single weighted-average discount rate derived from the yield curve used to measure the plan obligations. Subsequent to the change, we elected to measure service and interest costs by applying the specific spot rates along the yield curve to the plans’ estimated cash flows. We believe the new approach provides a more precise measurement of service and interest costs by aligning the timing of the plans’ liability cash flows to the corresponding spot rates on the yield curve. This change does not affect the measurement of our plan obligations. We have accounted for this change as a change in accounting estimate and, accordingly, have accounted for it on a prospective basis.

As of the Closing Date and as part of the Acquisition, our U.S. qualified defined benefit pension plan assumed certain U.S. qualified defined benefit pension obligations and assets related to active employees and certain terminated, vested retirees of the Acquired Business with a net liability of $281.7 million. In connection therewith, pension assets will be transferred from TDCC’s U.S. qualified defined benefit pension plans to our U.S. qualified defined benefit pension plan. Immediately prior to the Acquisition, the Acquired Business’s participant accounts assumed in the Acquisition were closed to new participants and were no longer accruing additional benefits.

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Also as of the Closing Date, we assumed certain accrued defined benefit pension liabilities relating to employees of TDCC in Germany, Switzerland and other international locations who transferred to Olin in connection with the Acquisition. The net liability assumed as of the Closing Date was $160.6 million.

	Pension Benefits						Other Postretirement Benefits
	Three Months Ended March 31,						Three Months Ended March 31,
	2016			2015			2016		2015
Components of Net Periodic Benefit (Income) Cost	($ in millions)
Service cost	$	3.2		$	1.6		$	0.3	$	0.3
Interest cost		22.4			20.6			0.5		0.6
Expected return on plans’ assets		(39.8	)		(35.6	)		—		—
Recognized actuarial loss		5.3			7.5			0.8		0.9
Curtailments/settlements		—			0.1			—		0.1
Net periodic benefit (income) cost	$	(8.9	)	$	(5.8	)	$	1.6	$	1.9

For the three months ended March 31, 2015, we recorded a curtailment charge of $0.2 million associated with permanently closing a portion of the Becancour, Canada chlor alkali facility that has been shut down since late June 2014. This charge was included in restructuring charges for the three months ended March 31, 2015.

We made cash contributions to our international qualified defined benefit pension plans of $0.5 million and $0.2 million for the three months ended March 31, 2016 and 2015, respectively.

INCOME TAXES

The following table accounts for the difference between the actual tax provision and the amounts obtained by applying the statutory U.S. federal income tax rate of 35.0% to income before taxes.

	Three Months Ended March 31,
Effective Tax Rate Reconciliation (Percent)	2016			2015
Statutory federal tax rate		35.0	%		35.0	%
Foreign rate differential		(3.8	)		(0.1	)
U.S. tax on foreign earnings		3.8			—
Domestic manufacturing/export tax incentive		—			(3.0	)
Salt Depletion		(3.4	)		(0.6	)
Dividends paid to CEOP		(0.6	)		(0.6	)
State income taxes, net		(1.4	)		0.6
Change in valuation allowance		0.1			1.0
Change in tax contingencies		1.6			—
Other, net		0.3			0.9
Effective tax rate		31.6	%		33.2	%

The condensed balance sheets include income tax receivables that are classified as other noncurrent assets of $1.5 million, $1.5 million and $6.6 million at March 31, 2016, December 31, 2015 and March 31, 2015, respectively.

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As of March 31, 2016, we had $33.5 million of gross unrecognized tax benefits, which would have a net $31.9 million impact on the effective tax rate, if recognized. As of March 31, 2015, we had $36.1 million of gross unrecognized tax benefits, of which $35.0 million would have impacted the effective tax rate, if recognized. The amount of unrecognized tax benefits was as follows:

	March 31,
	2016			2015
	($ in millions)
Balance at beginning of year	$	35.1		$	36.1
Decreases for prior year tax positions		(1.6	)		—
Balance at end of period	$	33.5		$	36.1

As of March 31, 2016, we believe it is reasonably possible that our total amount of unrecognized tax benefits will decrease by approximately $9.5 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. Our U.S. federal income tax returns are under examination by the Internal Revenue Service (IRS) for tax years 2008 and 2010 to 2012. In connection with the Acquisition, TDCC retained liabilities relating to taxes to the extent arising prior to the Closing Date. 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	2008; 2010 - 2015
U.S. state income tax	2006 - 2015
Canadian federal income tax	2012 - 2015
Brazil	2014 - 2015
Germany	2015
China	2014 - 2015
The Netherlands	2014 - 2015
South Korea	2014 - 2015
Hong Kong	2015

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 statement of financial position and measure those instruments at fair value. We use hedge accounting treatment for substantially all of our business transactions whose risks are covered using derivative instruments. In accordance with ASC 815, we designate commodity forward contracts as cash flow hedges of forecasted purchases of commodities and 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 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. Those commodity contracts that extend beyond one year correspond with raw material purchases for long-term fixed-price sales contracts.

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We enter into forward sales and purchase contracts to manage currency risk resulting from purchase and sale commitments denominated in foreign currencies. At March 31, 2016, we had outstanding forward contracts to buy foreign currency with a notional value of $29.6 million and to sell foreign currency with a notional value of $98.9 million. All of the currency derivatives expire within one year and are for U.S. dollar (USD) equivalents. The counterparties to the forward contracts were 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, 2015, we had outstanding forward contracts to buy foreign currency with a notional value of $21.7 million and to sell foreign currency with a notional value of $10.1 million. At March 31, 2015, we had no forward contracts to buy or sell foreign currencies.

In March 2010, we entered into interest rate swaps on $125 million of our underlying fixed-rate debt obligations, whereby we agreed to pay variable rates to a counterparty who, in turn, pays us fixed rates. The counterparty to these agreements is Citibank, N.A. (Citibank), a major financial institution. In October 2011, we entered into $125 million of interest rate swaps with equal and opposite terms as the $125 million variable interest rate swaps on the 6.75% senior notes due 2016 (2016 Notes). We have agreed to pay a fixed rate to a counterparty who, in turn, pays us variable rates. The counterparty to these agreements is also Citibank. The result was a gain of $11.0 million on the $125 million variable interest rate swaps, which will be recognized through 2016. As of March 31, 2016, $0.6 million of this gain was included in current installments of long-term debt. In October 2011, we de-designated our $125 million interest rate swaps that had previously been designated as fair value hedges. The $125 million variable interest rate swaps and the $125 million fixed interest rate swaps do not meet the criteria for hedge accounting. All changes in the fair value of these interest rate swaps are recorded currently in earnings.

Cash flow hedges

ASC 815 requires that all derivative instruments be recorded on the balance sheet at their fair value. 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 until the hedged item is recognized in earnings. Gains and losses on the derivatives representing hedge ineffectiveness are recognized currently in earnings.

We had the following notional amount of outstanding commodity forward contracts that were entered into to hedge forecasted purchases:

	March 31, 2016		December 31, 2015		March 31, 2015
	($ in millions)
Copper	$	43.1	$	43.6	$	58.3
Zinc		8.5		8.7		5.6
Lead		9.1		9.3		18.5
Natural gas		0.9		2.0		4.3

As of March 31, 2016, the counterparty to $35.0 million of these commodity forward contracts is Wells Fargo Bank, N.A. (Wells Fargo), a major financial institution, and the counterparty to $26.6 million of these commodity forward contracts is Citibank, a major financial institution.

We use cash flow hedges for certain raw material 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 associated with forecasted purchases of raw materials and energy used in the company’s manufacturing process. At March 31, 2016, we had open positions in futures contracts through 2021. If all open futures contracts had been settled on March 31, 2016, we would have recognized a pretax loss of $6.6 million.

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If commodity prices were to remain at March 31, 2016 levels, approximately $2.7 million of deferred losses would be reclassified into earnings during the next twelve months. The actual effect on earnings will be dependent on actual commodity prices when the forecasted transactions occur.

Fair value hedges

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. We had no interest rate swaps designated as fair value hedges as of March 31, 2016, December 31, 2015 and March 31, 2015.

In June 2012, we terminated $73.1 million of interest rate swaps with Wells Fargo that had been entered into on the SunBelt Notes in May 2011. The result was a gain of $2.2 million, which will be recognized through 2017. As of March 31, 2016, $0.3 million of this gain was included in long-term debt. Pursuant to a note purchase agreement dated December 22, 1997, the SunBelt Chlor Alkali Partnership (SunBelt) sold $97.5 million of Guaranteed Senior Secured Notes due 2017, Series O, and $97.5 million of Guaranteed Senior Secured Notes due 2017, Series G. We refer to these notes as the SunBelt Notes. The SunBelt Notes bear interest at a rate of 7.23% per annum, payable semi-annually in arrears on each June 22 and December 22.

We use interest rate swaps as a means of managing interest expense and floating interest rate exposure to optimal levels. These interest rate swaps are treated as fair value hedges. The accounting for gains and losses associated with changes in fair value of the derivative and the effect on the condensed financial statements will depend on the hedge designation and whether the hedge is effective in offsetting changes in fair value of cash flows of the asset or liability being hedged.

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.

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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:

	Asset Derivatives											Liability Derivatives
			Fair Value											Fair Value
Derivatives Designated as Hedging Instruments	Balance Sheet Location		March 31, 2016			December 31, 2015			March 31, 2015			Balance Sheet Location		March 31, 2016			December 31, 2015			March 31, 2015
			($ in millions)									($ in millions)
Interest rate contracts		Other current assets	$	—		$	—		$	—			Current installments of long- term debt	$	0.6		$	1.2		$	—
Interest rate contracts		Other assets		—			—			—			Long-term debt		0.3			0.4			3.8
Commodity contracts – losses		Other current assets		—			—			—			Accrued liabilities		7.6			11.5			8.1
Commodity contracts – gains		Other current assets		—			—			—			Accrued liabilities		(1.0	)		(0.1	)		(0.5	)
			$	—		$	—		$	—				$	7.5		$	13.0		$	11.4
Derivatives Not Designated as Hedging Instruments
Interest rate contracts – gains		Other current assets	$	0.9		$	1.2		$	—			Accrued liabilities	$	—		$	—		$	—
Interest rate contracts – losses		Other current assets		(0.4	)		(0.1	)		—			Accrued liabilities		—			—			—
Interest rate contracts – gains		Other assets		—			—			3.9			Other liabilities		—			—			—
Interest rate contracts – losses		Other assets		—			—			(1.0	)		Other liabilities		—			—			—
Commodity contracts – losses		Other current assets		—			—			—			Accrued liabilities		0.1			0.2			1.2
Foreign exchange contracts – gains		Other current assets		0.4			0.1			—			Accrued liabilities		(0.3	)		—			—
Foreign exchange contracts – losses		Other current assets		(0.4	)		—			—			Accrued liabilities		1.8			—			—
			$	0.5		$	1.2		$	2.9				$	1.6		$	0.2		$	1.2
Total derivatives(1)			$	0.5		$	1.2		$	2.9				$	9.1		$	13.2		$	12.6

(1) Does not include the impact of cash collateral received from or provided to counterparties.

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The following table summarizes the effects of derivative instruments on our condensed statements of income:

			Amount of Gain (Loss)
			Three Months Ended March 31,
	Location of Gain (Loss)		2016			2015
			($ in millions)
Derivatives – Cash Flow Hedges
Recognized in other comprehensive loss (effective portion)		—	$	1.1		$	(2.4	)
Reclassified from accumulated other comprehensive loss into income (effective portion)		Cost of goods sold	$	(3.7	)	$	(1.9	)
Derivatives – Fair Value Hedges
Interest rate contracts		Interest expense	$	0.7		$	0.7
Derivatives Not Designated as Hedging Instruments
Commodity contracts		Cost of goods sold	$	(0.4	)	$	(1.7	)
Foreign exchange contracts		Selling and administration		(3.1	)		—
			$	(3.5	)	$	(1.7	)

The ineffective portion of changes in fair value resulted in zero charged or credited to earnings for the three months ended March 31, 2016 and 2015.

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, exceed 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, 2016 and March 31, 2015, this threshold was not exceeded. As of December 31, 2015, the amount recognized in accrued liabilities for cash collateral provided by us to counterparties was $5.6 million. 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 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.

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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 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
	Level 1		Level 2		Level 3		Total
	($ in millions)
Balance at March 31, 2016
Assets
Interest rate swaps	$	—	$	0.5	$	—	$	0.5
Liabilities
Interest rate swaps	$	—	$	0.9	$	—	$	0.9
Commodity forward contracts		—		6.7		—		6.7
Foreign exchange contracts		—		1.5		—		1.5
Balance at December 31, 2015
Assets
Interest rate swaps	$	—	$	1.1	$	—	$	1.1
Foreign exchange contracts		—		0.1		—		0.1
Liabilities
Interest rate swaps	$	—	$	1.6	$	—	$	1.6
Commodity forward contracts		—		11.6		—		11.6
Balance at March 31, 2015
Assets
Interest rate swaps	$	—	$	2.9	$	—	$	2.9
Liabilities
Interest rate swaps	$	—	$	3.8	$	—	$	3.8
Commodity forward contracts		—		8.8		—		8.8

For the three months ended March 31, 2016, there were no transfers into or out of Level 1, Level 2 or Level 3.

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Interest Rate Swaps

The fair value of the interest rate swaps was included in other current assets, current installments of long-term debt and long-term debt as of March 31, 2016 and December 31, 2015. The fair value of the interest rate swaps was included in other assets and long-term debt as of March 31, 2015. These 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

The fair value of the commodity forward contracts was classified in accrued liabilities as of March 31, 2016, December 31, 2015 and March 31, 2015, with unrealized gains and losses included in accumulated other comprehensive loss, net of applicable taxes. These 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 forward 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

The fair value of foreign currency contracts was classified within other current assets and accrued liabilities as of March 31, 2016 and December 31, 2015, with gains and losses included in selling and administration expense as these financial instruments do not meet the criteria to qualify for hedge accounting. We had no fair value of foreign currency contracts as of March 31, 2015. 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, restricted cash, 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 on balance sheets
	Level 1		Level 2		Level 3		Total
	($ in millions)
Balance at March 31, 2016	$	—	$	3,778.5	$	153.0	$	3,931.5	$	3,833.0
Balance at December 31, 2015		—		3,826.9		153.0		3,979.9		3,848.8
Balance at March 31, 2015		—		538.7		153.0		691.7		665.1

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, 2016, December 31, 2015 and March 31, 2015.

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SUPPLEMENTAL GUARANTOR FINANCIAL INFORMATION

The following condensed consolidating guarantor financial information is presented to comply with the requirements of Rule 3-10 of Regulation S-X.

In October 2015, Spinco (the Issuer) issued $720.0 million aggregate principal amount of the 2023 Notes and $500.0 million aggregate principal amount of the 2025 Notes (collectively, the Notes). The Issuer was formed on March 13, 2015 as a wholly owned subsidiary of TDCC 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, 2016, December 31, 2015 and March 31, 2015, and the related condensed consolidating statements of operations, comprehensive income and cash flows for the three months ended March 31, 2016 and March 31, 2015, 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, 2016

(In millions)

(Unaudited)

	Parent Guarantor		Issuer		Subsidiary Non- Guarantor		Eliminations			Total
Assets
Current assets:
Cash and cash equivalents	$	19.8	$	—	$	295.8	$	—		$	315.6
Receivables, net		119.3		—		693.9		—			813.2
Intercompany receivables		—				1,498.9		(1,498.9	)		—
Income taxes receivable		35.3		—		1.0		—			36.3
Inventories		173.3		—		506.2		—			679.5
Current deferred income taxes		—		—		2.6		(2.6	)		—
Other current assets		150.7		5.0		6.2		(129.1	)		32.8
Total current assets		498.4		5.0		3,004.6		(1,630.6	)		1,877.4
Property, plant and equipment, net		501.4		—		3,357.6		—			3,859.0
Investment in Subsidiaries		5,970.8		3,675.2		—		(9,646.0	)		—
Deferred income taxes		170.8		—		—		(63.4	)		107.4
Other assets		42.8		—		421.0		—			463.8
Long-term receivables—affiliates		—		2,553.2		—		(2,553.2	)		—
Intangible assets, net		0.1		—		663.1		—			663.2
Goodwill		—		985.4		1,160.7		—			2,146.1
Total assets	$	7,184.3	$	7,218.8	$	8,607.0	$	(13,893.2	)	$	9,116.9
Liabilities and Shareholders’ Equity
Current liabilities:
Current installments of long-term debt	$	192.9	$	—	$	12.2	$	—		$	205.1
Accounts payable		45.9		—		432.2		—			478.1
Intercompany payables		1,459.5		39.4		—		(1,498.9	)		—
Income taxes payable		2.5		—		14.2		(2.6	)		14.1
Accrued liabilities		267.8		—		213.6		(129.1	)		352.3
Total current liabilities		1,968.6		39.4		672.2		(1,630.6	)		1,049.6
Long-term debt		1,067.7		2,547.8		12.4		—			3,627.9

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CONDENSED CONSOLIDATING BALANCE SHEETS

March 31, 2016

(In millions)

(Unaudited)

	Parent Guarantor			Issuer		Subsidiary Non- Guarantor			Eliminations			Total
Accrued pension liability		182.4			—		452.8			—			635.2
Deferred income taxes		8.6			189.7		892.7			—			1,091.0
Long-term payables—affiliates		1,291.8			281.7		979.7			(2,553.2	)		—
Other liabilities		292.4			—		111.4			(63.4	)		340.4
Total liabilities		4,811.5			3,058.6		3,121.2			(4,247.2	)		6,744.1
Commitments and contingencies
Shareholders’ equity:
Common stock		165.2			—		14.6			(14.6	)		165.2
Additional paid-in capital		2,238.9			4,146.1		4,790.3			(8,936.4	)		2,238.9
Accumulated other comprehensive loss		(470.2	)		—		(7.2	)		7.2			(470.2	)
Retained earnings		438.9			14.1		688.1			(702.2	)		438.9
Total shareholders’ equity		2,372.8			4,160.2		5,485.8			(9,646.0	)		2,372.8
Total liabilities and shareholders’ equity	$	7,184.3		$	7,218.8	$	8,607.0		$	(13,893.2	)	$	9,116.9

29

CONDENSED CONSOLIDATING BALANCE SHEETS

December 31, 2015

(In millions)

(Unaudited)

	Parent Guarantor			Issuer			Subsidiary Non- Guarantor			Eliminations			Total
Assets
Current assets:
Cash and cash equivalents	$	119.4		$	—		$	272.6		$	—		$	392.0
Receivables, net		107.7			—			679.4			(3.7	)		783.4
Intercompany receivables		—			—			995.0			(995.0	)		—
Income taxes receivable		34.6			—			1.5			(3.2	)		32.9
Inventories		166.0			—			519.2			—			685.2
Current deferred income taxes		—			—			2.7			(2.7	)		—
Other current assets		152.1			5.0			4.6			(121.8	)		39.9
Total current assets		579.8			5.0			2,475.0			(1,126.4	)		1,933.4
Property, plant and equipment, net		508.7			—			3,444.7			—			3,953.4
Investment in Subsidiaries		5,905.0			3,636.3			—			(9,541.3	)		—
Deferred income taxes		—			—			104.6			(8.7	)		95.9
Other assets		43.5			—			411.1			—			454.6
Long-term receivables—affiliates		—			2,562.6			—			(2,562.6	)		—
Intangible assets, net		0.5			—			677.0			—			677.5
Goodwill		—			990.2			1,183.9			—			2,174.1
Total assets	$	7,037.5		$	7,194.1		$	8,296.3		$	(13,239.0	)	$	9,288.9
Liabilities and Shareholders’ Equity
Current liabilities:
Current installments of long-term debt	$	192.8		$	—		$	12.2		$	—		$	205.0
Accounts payable		36.1			—			576.6			(4.5	)		608.2
Intercompany payables		966.0			29.0			—			(995.0	)		—
Income taxes payable		2.7			—			8.1			(5.9	)		4.9
Accrued liabilities		227.8			—			221.3			(121.0	)		328.1
Total current liabilities		1,425.4			29.0			818.2			(1,126.4	)		1,146.2
Long-term debt		1,084.0			2,547.4			12.4			—			3,643.8
Accrued pension liability		484.3			—			164.6			—			648.9
Deferred income taxes		32.5			189.7			881.7			(8.7	)		1,095.2
Long-term payables—affiliates		1,296.4			286.5			979.7			(2,562.6	)		—
Other liabilities		296.1			—			39.9			—			336.0
Total liabilities		4,618.7			3,052.6			2,896.5			(3,697.7	)		6,870.1
Commitments and contingencies
Shareholders’ equity:
Common stock		165.1			—			14.6			(14.6	)		165.1
Additional paid-in capital		2,236.4			4,146.1			4,789.6			(8,935.7	)		2,236.4
Accumulated other comprehensive loss		(492.5	)		—			(31.7	)		31.7			(492.5	)
Retained earnings		509.8			(4.6	)		627.3			(622.7	)		509.8
Total shareholders’ equity		2,418.8			4,141.5			5,399.8			(9,541.3	)		2,418.8
Total liabilities and shareholders’ equity	$	7,037.5		$	7,194.1		$	8,296.3		$	(13,239.0	)	$	9,288.9

30

CONDENSED CONSOLIDATING BALANCE SHEETS

March 31, 2015

(In millions)

(Unaudited)

	Parent Guarantor			Issuer		Subsidiary Non- Guarantor			Eliminations			Total
Assets
Current assets:
Cash and cash equivalents	$	179.2		$	—	$	17.6		$	—		$	196.8
Receivables, net		130.0			—		173.8			—			303.8
Intercompany receivables		—			—		622.7			(622.7	)		—
Income taxes receivable		15.1			—		—			—			15.1
Inventories		149.1			—		67.0			—			216.1
Current deferred income taxes		42.6			—		11.4			—			54.0
Other current assets		111.9			—		2.2			(96.7	)		17.4
Total current assets		627.9			—		894.7			(719.4	)		803.2
Property, plant and equipment, net		503.7			—		416.2			—			919.9
Investment in Subsidiaries		1,694.2			—		—			(1,694.2	)		—
Deferred income taxes		64.1			—		—			(51.2	)		12.9
Other assets		60.1			—		10.1			—			70.2
Intangible assets, net		0.5			—		119.3			—			119.8
Goodwill		—			—		747.1			—			747.1
Total assets	$	2,950.5		$	—	$	2,187.4		$	(2,464.8	)	$	2,673.1
Liabilities and Shareholders’ Equity
Current liabilities:
Current installments of long-term debt	$	4.2		$	—	$	12.2		$	—		$	16.4
Accounts payable		60.7			—		87.7			(0.6	)		147.8
Intercompany payables		622.7			—		—			(622.7	)		—
Income taxes payable		1.1			—		—			—			1.1
Accrued liabilities		135.5			—		165.7			(96.1	)		205.1
Total current liabilities		824.2			—		265.6			(719.4	)		370.4
Long-term debt		623.9			—		24.8			—			648.7
Accrued pension liability		165.0			—		2.2			—			167.2
Deferred income taxes		—			—		158.5			(51.2	)		107.3
Other liabilities		319.2			—		42.1			—			361.3
Total liabilities		1,932.3			—		493.2			(770.6	)		1,654.9
Commitments and contingencies
Shareholders’ equity:
Common stock		77.5			—		14.6			(14.6	)		77.5
Additional paid-in capital		792.1			—		1,221.3			(1,221.3	)		792.1
Accumulated other comprehensive loss		(439.7	)		—		(20.1	)		20.1			(439.7	)
Retained earnings		588.3			—		478.4			(478.4	)		588.3
Total shareholders’ equity		1,018.2			—		1,694.2			(1,694.2	)		1,018.2
Total liabilities and shareholders’ equity	$	2,950.5		$	—	$	2,187.4		$	(2,464.8	)	$	2,673.1

31

CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS

Three Months Ended March 31, 2016

(In millions)

(Unaudited)

	Parent Guarantor			Issuer			Subsidiary Non- Guarantor			Eliminations			Total
Sales	$	320.7		$	—		$	1,141.3		$	(113.8	)	$	1,348.2
Operating expenses:
Cost of goods sold		275.3			—			1,013.9			(113.8	)		1,175.4
Selling and administration		36.8			—			51.3			—			88.1
Restructuring charges		0.3			—			92.5			—			92.8
Acquisition-related costs		10.2			—			—			—			10.2
Other operating (loss) income		(0.5	)		—			11.4			—			10.9
Operating (loss) income		(2.4	)		—			(5.0	)		—			(7.4	)
Earnings of non-consolidated affiliates		0.2			—			—			—			0.2
Equity income (loss) in subsidiaries		(28.8	)		43.6			—			(14.8	)		—
Interest expense		10.7			38.2			1.0			(1.4	)		48.5
Interest income		0.8			—			0.9			(1.4	)		0.3
Income (loss) before taxes		(40.9	)		5.4			(5.1	)		(14.8	)		(55.4	)
Income tax (benefit) provision		(3.0	)		(13.3	)		(1.2	)		—			(17.5	)
Net (loss) income	$	(37.9	)	$	18.7		$	(3.9	)	$	(14.8	)	$	(37.9	)

CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS

Three Months Ended March 31, 2015

(In millions)

(Unaudited)

	Parent Guarantor			Issuer		Subsidiary Non- Guarantor		Eliminations			Total
Sales	$	323.1		$	—	$	289.4	$	(94.5	)	$	518.0
Operating expenses:
Cost of goods sold		274.7			—		253.0		(94.5	)		433.2
Selling and administration		35.3			—		11.7		—			47.0
Restructuring charges		—			—		1.2		—			1.2
Acquisition-related costs		10.4			—		—		—			10.4
Other operating (loss) income		(0.6	)		—		0.4		—			(0.2	)
Operating income		2.1			—		23.9		—			26.0
Earnings of non-consolidated affiliates		0.4			—		—		—			0.4
Equity income (loss) in subsidiaries		15.1			—		—		(15.1	)		—
Interest expense		7.9			—		0.5		(1.3	)		7.1
Interest income		0.8			—		0.8		(1.3	)		0.3
Income (loss) before taxes		10.5			—		24.2		(15.1	)		19.6
Income tax (benefit) provision		(2.6	)		—		9.1		—			6.5
Net income (loss)	$	13.1		$	—	$	15.1	$	(15.1	)	$	13.1

32

CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME

Three Months Ended March 31, 2016

(In millions)

(Unaudited)

	Parent Guarantor			Issuer		Subsidiary Non- Guarantor			Eliminations			Total
Net (loss) income	$	(37.9	)	$	18.7	$	(3.9	)	$	(14.8	)	$	(37.9	)
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments, net		15.5			—		15.5			(15.5	)		15.5
Unrealized losses on derivative contracts, net		3.0			—		—			—			3.0
Amortization of prior service costs and actuarial losses, net		3.8			—		0.5			(0.5	)		3.8
Total other comprehensive income (loss), net of tax		22.3			—		16.0			(16.0	)		22.3
Comprehensive (loss) income	$	(15.6	)	$	18.7	$	12.1		$	(30.8	)	$	(15.6	)

CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME

Three Months Ended March 31, 2015

(In millions)

(Unaudited)

	Parent Guarantor			Issuer		Subsidiary Non- Guarantor			Eliminations			Total
Net income (loss)	$	13.1		$	—	$	15.1		$	(15.1	)	$	13.1
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments, net		(1.4	)		—		(1.4	)		1.4			(1.4	)
Unrealized losses on derivative contracts, net		(0.3	)		—		—			—			(0.3	)
Amortization of prior service costs and actuarial losses, net		5.1			—		0.4			(0.4	)		5.1
Total other comprehensive income (loss), net of tax		3.4			—		(1.0	)		1.0			3.4
Comprehensive income (loss)	$	16.5		$	—	$	14.1		$	(14.1	)	$	16.5

33

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS

Three Months Ended March 31, 2016

(In millions)

(Unaudited)

	Parent Guarantor			Issuer			Subsidiary Non- Guarantor			Eliminations		Total
Net Operating Activities	$	(35.5	)	$	—		$	82.5		$	—	$	47.0
Investing Activities
Capital expenditures		(16.2	)		—			(59.9	)		—		(76.1	)
Proceeds from disposition of property, plant and equipment		—			—			0.1			—		0.1
Distributions from affiliated companies, net		2.2			—			—			—		2.2
Net investing activities		(14.0	)		—			(59.8	)		—		(73.8	)
Financing Activities
Long-term debt repayments		(0.2	)		(16.9	)		—			—		(17.1	)
Dividends paid		(33.0	)		—			—			—		(33.0	)
Intercompany financing activities		(16.9	)		16.9			—			—		—
Net financing activities		(50.1	)		—			—			—		(50.1	)
Effect of exchange rate changes on cash and cash equivalents		—			—			0.5			—		0.5
Net (decrease) increase in cash and cash equivalents		(99.6	)		—			23.2			—		(76.4	)
Cash and cash equivalents, beginning of year		119.4			—			272.6			—		392.0
Cash and cash equivalents, end of year	$	19.8		$	—		$	295.8		$	—	$	315.6

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS

Three Months Ended March 31, 2015

(In millions)

(Unaudited)

	Parent Guarantor			Issuer		Subsidiary Non- Guarantor			Eliminations		Total
Net Operating Activities	$	(15.5	)	$	—	$	5.9		$	—	$	(9.6	)
Investing Activities
Capital expenditures		(18.6	)		—		(4.7	)		—		(23.3	)
Proceeds from disposition of property, plant and equipment		0.2			—		0.4			—		0.6
Distributions from affiliated companies, net		2.2			—		—			—		2.2
Other investing activities		—			—		(1.4	)		—		(1.4	)
Net investing activities		(16.2	)		—		(5.7	)		—		(21.9	)
Financing Activities
Long-term debt repayments		(1.0	)		—		—			—		(1.0	)
Stock options exercised		2.0			—		—			—		2.0
Excess tax benefits from stock-based compensation		0.3			—		—			—		0.3
Dividends paid		(15.5	)		—		—			—		(15.5	)
Debt and equity issuance costs		(14.3	)		—		—			—		(14.3	)
Net financing activities		(28.5	)		—		—			—		(28.5	)
Net (decrease) increase in cash and cash equivalents		(60.2	)		—		0.2			—		(60.0	)
Cash and cash equivalents, beginning of year		239.4			—		17.4			—		256.8
Cash and cash equivalents, end of year	$	179.2		$	—	$	17.6		$	—	$	196.8

34

EX-99.3

Exhibit 99.3

The Dow Chlorine Products Business

Combined Statements of Loss and Comprehensive Loss

	Nine Months Ended
In millions (Unaudited)	Sep 30, 2015			Sep 30, 2014
Net sales – external	$	2,342		$	2,919
Net sales - related party		501			700
Net Sales		2,843			3,619
Cost of sales		2,707			3,483
Research and development expenses		21			26
Selling, general and administrative expenses		95			117
Sundry expense - net		1			3
Interest expense		9			9
Income (Loss) Before Income Taxes		10			(19	)
Provision for income taxes		23			9
Net Loss		(13	)		(28	)
Net loss attributable to noncontrolling interests		(10	)		(3	)
Net Loss Attributable to the Business		(3	)		(25	)
Other Comprehensive Loss, Net of Tax
Translation adjustments (net of tax - 2015; $1, 2014: $1)		(3	)		(8	)
Total other comprehensive loss		(3	)		(8	)
Comprehensive Loss		(16	)		(36	)
Comprehensive loss attributable to noncontrolling interests		(10	)		(3	)
Comprehensive Loss Attributable to the Business	$	(6	)	$	(33	)

See Notes to the Combined Financial Statements.

The Dow Chlorine Products Business

Combined Balance Sheets

In millions (Unaudited)	Sep 30, 2015		Dec 31, 2014
Assets
Current Assets
Accounts receivable:
Trade (net of allowance for doubtful receivables - 2015: $3; 2014: $3)	$	289	$	175
Other		7		16
Inventories		334		354
Deferred income tax assets - current		23		23
Restricted cash		45		20
Total current assets (variable interest entity restricted - 2015: $46; 2014: $20)		698		588
Property
Property		5,613		5,703
Less accumulated depreciation		4,134		4,090
Net property (variable interest entity restricted - 2015: $751; 2014: $815)		1,479		1,613
Other Assets
Goodwill		56		56
Other intangible assets (net of accumulated amortization 2015: $45; 2014: $47)		3		3
Deferred income tax assets - noncurrent		1		1
Deferred charges and other assets (all variable interest entity restricted)		14		14
Total other assets		74		74
Total Assets	$	2,251	$	2,275
Liabilities and Equity
Current Liabilities
Accounts payable:
Trade	$	312	$	372
Other		18		8
Income taxes payable		32		29
Current portion of long-term debt (all variable interest entity nonrecourse)		51		53
Accrued and other current liabilities		60		65
Total current liabilities (variable interest entity nonrecourse - 2015: $60; 2014: $57)		473		527
Noncurrent Liabilities
Deferred income tax liabilities - noncurrent		83		93
Long-term debt (all variable interest entity nonrecourse)		528		553
Other noncurrent obligations		134		144
Total noncurrent liabilities		745		790
Combined Equity
Net parent investment		898		809
Accumulated other comprehensive income		26		29
Total Business equity		924		838
Noncontrolling interests		109		120
Total combined equity		1,033		958
Total Liabilities and Combined Equity	$	2,251	$	2,275

See Notes to the Combined Financial Statements.

2

The Dow Chlorine Products Business

Combined Statements of Cash Flows

	Nine Months Ended
In millions (Unaudited)	Sep 30, 2015			Sep 30, 2014
Operating Activities
Net loss	$	(13	)	$	(28	)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization		164			163
Credit for deferred income tax		(9	)		(23	)
Changes in assets and liabilities:
Trade accounts receivable		(114	)		(31	)
Inventories		20			16
Trade accounts payable		(60	)		14
Other assets and liabilities		12			38
Cash provided by operating activities		—			149
Investing Activities
Change in restricted cash		(25	)		(34	)
Capital expenditures		(40	)		(57	)
Cash used in investing activities		(65	)		(91	)
Financing Activities
Net cash transfers from (to) parent		92			(68	)
Proceeds from issuance of long-term debt		—			31
Payments on long-term debt		(27	)		(21	)
Cash provided by (used in) financing activities		65			(58	)
Summary
Increase (Decrease) in cash and cash equivalents		—			—
Cash and cash equivalents at beginning of year		—			—
Cash and cash equivalents at end of period	$	—		$	—

See Notes to the Combined Financial Statements.

3

The Dow Chlorine Products Business

Combined Statements of Equity

In millions (Unaudited)	Net Parent Investment			Accumulated Other Comprehensive Income			Noncontrolling Interests			Total Combined Equity
Balance at December 31, 2013	$	909		$	40		$	124		$	1,073
Net loss		(25	)		—			(3	)		(28	)
Translation adjustments, net of tax		—			(8	)		—			(8	)
Other		—			—			1			1
Net transfers to parent		(68	)		—			—			(68	)
Balance at September 30, 2014	$	816		$	32		$	122			970

In millions (Unaudited)	Net Parent Investment			Accumulated Other Comprehensive Income			Noncontrolling Interests			Total Combined Equity
Balance at December 31, 2014	$	809		$	29		$	120		$	958
Net loss		(3	)		—			(10	)		(13	)
Translation adjustments, net of tax		—			(3	)		—			(3	)
Other		—			—			(1	)		(1	)
Net transfers to parent		92			—			—			92
Balance at September 30, 2015	$	898		$	26		$	109			1,033

See Notes to the Combined Financial Statements.

4

NOTE 1 - DESCRIPTION OF THE DOW CHLORINE PRODUCTS BUSINESS

The accompanying combined financial statements present the combined assets, liabilities, revenues and expenses related to the chlorine, caustic, chlorinated organics and global epoxy operations (collectively, the “Dow Chlorine Products Business” or “DCP”) of The Dow Chemical Company (“Dow”). DCP’s core activities include:

• the chlor-alkali activity at Freeport, Texas (“Freeport”) and Plaquemine, Louisiana (“Plaquemine”), which produce chlorine and caustic soda;

• the chlor-alkali activity in the membrane chlor-alkali facility located at the integrated Freeport manufacturing complex as part of a joint venture arrangement with Mitsui & Co. Ltd (the “Joint Venture”) as described in Note 6;

• the chlor-vinyl activity at Freeport and Plaquemine, which focuses on the production, supply and marketing of ethylene dichloride and vinyl chloride monomer;

• all global chlorinated organics activity primarily located at Freeport, Plaquemine and Stade, Germany; and

• the global epoxy operations, which includes the production of epoxy resins and epoxy intermediates.

DCP also includes activity related to brine mining and certain energy assets in Freeport, both of which are key inputs to the chlor-alkali and chlor-vinyl operations. The chlor-alkali and chlor-vinyl products are further utilized by other Dow operations, including global chlorinated organics, or sold to third parties. Global chlorinated organics produces chloroform, methyl chloride, methylene chloride, perchloroethylene and trichloroethylene for the use in cleaning applications, construction, fluoropolymers, pharmaceuticals, refrigerants and water treatment. Epoxy products include bisphenol A, allyl chloride, epichlorohydrin, liquid epoxy resins, cumene, glycerine and differentiated epoxy resins. The products are used in a variety of markets and applications including electrical laminates, civil engineering, composites, infrastructure and consumer goods among others. DCP has manufacturing facilities in the United States of America, China, Japan, South Korea, Germany, Italy, the Netherlands and Brazil.

NOTE 2 - COMBINED FINANCIAL STATEMENTS

The unaudited interim financial statements of the Dow Chlorine Products Business present the results of operations, financial position, and cash flows of DCP and have been derived from the combined financial statements and accounting records of Dow using the historical results of operations and historical basis of assets and liabilities of DCP. The combined financial statements of the Dow Chlorine Products Business were prepared in accordance with accounting principles generally accepted in the United States of America (U.S. GAAP) and reflect all adjustments (including normal recurring accruals) which, in the opinion of management, are considered necessary for the fair presentation of the results for the periods presented. These statements should be read in conjunction with the Dow Chlorine Products Business audited combined financial statements and notes thereto for the year ended December 31, 2014.

NOTE 3 - RECENT ACCOUNTING GUIDANCE

Accounting Guidance Issued But Not Adopted as of September 30, 2015

In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09, “Revenue from Contracts with Customers (Topic 606),” which is the new comprehensive revenue recognition standard that will supersede all existing revenue recognition guidance under U.S. GAAP. The standard’s core principle is that a company will recognize revenue when it transfers promised goods or services to a customer in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services.

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ASU 2015-14, “Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date,” which was issued in August 2015, revised the effective date for this ASU to annual and interim periods beginning on or after December 15, 2017, with early adoption permitted, but not earlier than the original effective date of annual and interim periods beginning on or after December 15, 2016, for public entities. Entities will have the option of using either a full retrospective approach or a modified approach to adopt the guidance in ASU 2014-09. The Dow Chlorine Products Business is currently evaluating the impact of adopting this guidance.

In February 2015, the FASB issued ASU 2015-02, “Consolidation (Topic 810): Amendments to the Consolidation Analysis,” which makes changes to both the variable interest model and voting interest model and eliminates the indefinite deferral of FASB Statement No. 167, included in ASU 2010-10, for certain investment funds. All reporting entities that hold a variable interest in other legal entities will need to re-evaluate their consolidation conclusions as well as disclosure requirements. This ASU is effective for annual periods beginning after December 15, 2015, and early adoption is permitted, including any interim period. The Dow Chlorine Products Business is currently evaluating the impact of adopting this guidance.

In April 2015, the FASB issued ASU 2015-03, “Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs,” which requires debt issuance costs be presented in the balance sheet as a direct deduction from the carrying value of the associated debt liability, and amortization of those costs should be reported as interest expense. This ASU is effective for financial statements issued for annual and interim periods beginning after December 15, 2015, and early adoption is permitted for financial statements that have not been previously issued. The new guidance should be applied on a retrospective basis for each period presented in the balance sheet. The Dow Chlorine Products Business is currently evaluating the impact of adopting this guidance.

In July 2015, the FASB issued ASU 2015-11, “Inventory (Topic 330): Simplifying the Measurement of Inventory,” which applies to inventory that is measured using first-in, first-out (“FIFO”) or average cost. Under the updated guidance, an entity should measure inventory that is within scope at the lower of cost and net realizable value, which is the estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal and transportation. Subsequent measurement is unchanged for inventory that is measured using last-in, last-out (“LIFO”). This ASU is effective for annual and interim periods beginning after December 15, 2016, and should be applied prospectively with early adoption permitted at the beginning of an interim or annual reporting period. The Dow Chlorine Products Business is currently evaluating the impact of adopting this guidance.

NOTE 4 - INVENTORIES

The following table provides a breakdown of inventories:

Inventories In millions	Sep 30, 2015		Dec 31, 2014
Finished goods	$	238	$	231
Work in process		50		73
Raw materials		14		12
Supplies		32		38
Total inventories	$	334	$	354

The adjustment to inventories from a FIFO basis to a LIFO basis amounted to a reduction of $37 at September 30, 2015 and $73 at December 31, 2014. Inventories valued on a LIFO basis, principally U.S. product inventories, represented 31 percent of the total inventories at September 30, 2015 and 30 percent of the total inventories at December 31, 2014.

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NOTE 5 - GOODWILL AND OTHER INTANGIBLE ASSETS

Goodwill

The carrying amount of goodwill was $56 at September 30, 2015 and December 31, 2014. No impairment charges were recorded in the periods presented.

Other Intangible Assets

The following table provides information regarding DCP’s intangible assets:

Other Intangible Assets	At September 30, 2015							At December 31, 2014
In millions	Gross Carrying Amount		Accumulated Amortization			Net		Gross Carrying Amount		Accumulated Amortization			Net
Other intangible assets with finite lives:
Intellectual property	$	44	$	(42	)	$	2	$	46	$	(44	)	$	2
Trademarks		4		(3	)		1		4		(3	)		1
Total other intangible assets (1)	$	48	$	(45	)	$	3	$	50	$	(47	)	$	3

(1) Amortization expense was less than $1 in the nine-month periods ended September 30, 2015 and 2014.

(Estimated amortization expense for intangible assets is $1 for 2015, 2016, and 2017.

NOTE 6 - VARIABLE INTEREST ENTITY

The Dow Chlorine Products Business holds a variable interest in the Joint Venture and is the primary beneficiary. The Joint Venture constructed, owns and operates a membrane chlor-alkali facility located at the integrated Freeport manufacturing complex. The variable interest relates to equity options between the members and a cost-plus off-take arrangement between the Joint Venture and DCP involving proportional purchase commitments on take-or-pay terms and ensuring a guaranteed return to the Joint Venture. The Dow Chlorine Products Business is the primary beneficiary because it provides the Joint Venture with operation and maintenance services, utilities, and raw materials; markets the Joint Venture’s co-products; and converts the other member’s proportional purchase commitments into ethylene dichloride under a tolling arrangement at a plant owned by DCP. During the first quarter of 2014, the Joint Venture successfully initiated full-scale, commercial production.

As the primary beneficiary, the Joint Venture’s assets, liabilities and results of operations are included in the combined financial statements of DCP. The cash balance of $45 at September 30, 2015 ($20 at December 31, 2014) is restricted and consists of amounts specifically restricted for the construction, debt service and operational expenses of the manufacturing facility.

Joint Venture Litigation

On January 11, 2011, the Joint Venture, Samsung Engineering America Inc., and Samsung Engineering Co., Ltd. (“Samsung”) executed an agreement to provide engineering, construction and procurement services for the establishment of a chlor-alkali plant in Freeport (the “2011 EPC Agreement”).

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The Joint Venture and Samsung are currently in arbitration proceedings pursuant to the dispute resolution clause of the 2011 EPC Agreement. Due to the complexity of the claims and counterclaims, while it is reasonably possible that a loss or gain could occur, the range of possible outcomes cannot be estimated at this time. Nevertheless, Dow and the Joint Venture believe the likelihood of a material loss is remote.

NOTE 7 - COMMITMENTS AND CONTINGENT LIABILITIES

Environmental Matters

Accruals for environmental matters are recorded when it is probable that a liability has been incurred and the amount of the liability can be reasonably estimated based on current law and existing technologies. At September 30, 2015, the Dow Chlorine Products Business had accrued obligations of $65 ($64 at December 31, 2014) for probable environmental remediation and restoration costs. This is management’s best estimate of the costs for remediation and restoration with respect to environmental matters for which DCP has accrued liabilities, although it is reasonably possible that the ultimate cost with respect to these particular matters could range up to approximately one and a half times that amount. Consequently, it is reasonably possible that environmental remediation and restoration costs in excess of amounts accrued could have a material impact on the Dow Chlorine Products Business’s results of operations, financial position and cash flows. It is the opinion of management, however, that the possibility is remote that costs in excess of the range disclosed will have a material impact on the combined financial statements. Inherent uncertainties exist in these estimates primarily due to unknown conditions, changing governmental regulations and legal standards regarding liability and emerging remediation technologies for handling site remediation and restoration.

Purchase Commitments

A summary of DCP’s purchase commitments can be found in Note 11 to the Dow Chlorine Products Business combined audited financial statements for the year ended December 31, 2014. There have been no material changes to the purchase commitments since December 31, 2014.

Litigation Matters

The Dow Chlorine Products Business is party to a number of claims and lawsuits arising out of the normal course of business with respect to commercial matters, including product liability, governmental regulation and other actions. Certain of these actions purport to be class actions and seek damages in very large amounts. All such claims are being contested. Dow has an active risk management program consisting of numerous insurance policies secured from many carriers at various times. These policies often provide coverage that will be utilized to minimize the financial impact, if any, of the contingencies. It is the opinion of DCP management that the possibility is remote that the aggregate of all such claims and lawsuits will have a material adverse impact on the results of operations, financial condition and cash flows of DCP.

NOTE 8 - LONG-TERM DEBT

On March 29, 2011, the Joint Venture entered into an agreement with eight lenders for a credit facility totaling $677 (“Loan”) to fund the costs for completing a manufacturing complex in Freeport (the “Project”) and for working capital needs after start up. The Joint Venture concurrently executed a security agreement with Sumitomo Mitsui Banking Corporation, acting as collateral agent (“Collateral Agent”) for the lenders, under which the Joint Venture granted security interests of assets and agreements related to the Project to the Collateral Agent. The members of the Joint Venture each entered into pledge agreements with the Collateral Agent under which they pledged their respective member’s interest to the Collateral Agent as security against the Loan.

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The outstanding Loan balance was $569 at September 30, 2015 and $596 at December 31, 2014. The fair value of the outstanding Loan approximates its carrying value. The final maturity of the Loan is March 29, 2026. The interest rate related to the Loan is 1.65 percent plus London InterBank Offered Rate, or 1.90 percent at September 30, 2015. Interest expense was $9 in the first three quarters of 2015 and 2014. Capitalized interest, inclusive of debt issuance costs, was $1 in the nine-month period ended September 30, 2014.

In 2014, the Joint Venture borrowed $10 from Mitsui & Co. Ltd (“Affiliate Loan”). The final maturity of the Affiliate Loan is March 29, 2026. The interest rate related to the Affiliate Loan is 4.5 percent at September 30, 2015. Interest is accrued monthly and added to the outstanding principal amount bi-annually if unpaid on the interest payment dates. Interest accrued was less than $1 in the first three quarters of 2015 and 2014.

The table presents approximate maturities of long-term debt for each of the next 5 years and thereafter:

Estimated Long-Term Debt Payments for Next Five Years and Thereafter at September 30, 2015

In millions
2015	$	26
2016	$	49
2017	$	46
2018	$	46
2019	$	46
Thereafter	$	366

NOTE 9 - OPERATING SEGMENTS

Operating Segment Information	Nine Months Ended
In millions	Sep 30, 2015			Sep 30 2014
Sales to external customers (1) by operating segment
Chlor-Alkali & Vinyl	$	996		$	1,055
Global Chlorinated Organics		290			359
Global Epoxy		1,557			2,205
Total	$	2,843		$	3,619
Intersegment revenues (1) by operating segment
Chlor-Alkali & Vinyl	$	117		$	109
Eliminations		(117	)		(109	)
Total	$	—			—
EBITDA (2) by operating segment
Chlor-Alkali & Vinyl	$	130		$	148
Global Chlorinated Organics		2			12
Global Epoxy		51			(7	)
Total	$	183		$	153

(1) Transfers of products between segments and affiliates are generally valued at cost.

(2) DCP uses EBITDA (which DCP defines as earnings (i.e., “Net Income”) before interest, income taxes, depreciation and amortization) as its measure of profit/loss for segment reporting purposes. EBITDA by operating segment includes all operating items relating to the Business. A reconciliation of EBITDA to “Income (Loss) Before Income Taxes” is provided below.

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Reconciliation of EBITDA to “Income (Loss) Before Income Taxes”	Nine Months Ended
In millions	Sep 30, 2015		Sep 30, 2014
EBITDA	$	183	$	153
– Depreciation and amortization		164		163
– Interest expense		9		9
Income (Loss) Before Income Taxes	$	10	$	(19	)

NOTE 10 - SUBSEQUENT EVENTS

On October 5, 2015 Dow and Olin Corporation closed the previously announced split-off transaction, resulting in the separation of Dow’s U.S. Gulf Coast Chlor-Alkali and Vinyl, Global Chlorinated Organics, and Global Epoxy business units, in addition to 100 percent interest in the Dow Mitsui Chlor-Alkali joint venture, and the merger of these businesses with Olin Corporation.

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EX-99.4

Exhibit 99.4

Unaudited pro forma condensed combined financial statements of

Olin and the Dow Chlorine Products Business

The following unaudited pro forma condensed combined financial statements present the combination of the historical financial statements of Olin and DCP, adjusted to give effect to: (1) the Merger and (2) the other Transactions. Capitalized terms used herein are defined below under the caption “Helpful Definitions”.

The unaudited pro forma condensed combined statements of operations for the year ended December 31, 2015 combine the historical consolidated statement of operations of Olin and the historical combined statement of income (loss) for DCP, giving effect to the Merger and the other Transactions as if they had been consummated on January 1, 2015, the beginning of the earliest period presented.

The unaudited pro forma condensed combined financial statements were prepared using the acquisition method of accounting with Olin considered the acquirer of DCP. Under the acquisition method of accounting, the purchase price is allocated to the underlying tangible and intangible assets acquired and liabilities assumed based on their respective fair values, with any excess purchase price allocated to goodwill. The pro forma purchase price allocation was based on a preliminary estimate of the fair values of the tangible and intangible assets and liabilities of DCP. In arriving at the estimated fair values, Olin has considered the preliminary appraisals of independent consultants which were based on a preliminary and limited review of the assets and liabilities related to DCP transferred to, or assumed by, Blue Cube in the Transactions. Now that the Transactions have closed, Olin is in the process of completing the purchase price allocation after considering the fair value of DCP’s assets and liabilities at the level of detail necessary to finalize the required purchase price allocation. The final purchase price allocation may be different than the preliminary allocation of the purchase price presented in the notes to Olin’s unaudited historical consolidated financial statements as of and for the three months ended March 31, 2016, which are contained in Olin’s Quarterly Report on Form 10-Q for the period ended March 31, 2016, and this difference may be material.

The historical combined financial statements of DCP have been “carved-out” from TDCC’s consolidated financial statements and reflect assumptions and allocations made by TDCC. DCP’s historical combined financial statements include all revenues, costs, assets and liabilities that are directly attributable to DCP. In addition, certain expenses reflected in DCP’s combined financial statements are an allocation from TDCC. Such expenses include, but are not limited to, general corporate expenses related to finance, legal, information technology, human resources, ethics and compliance, shared services, employee benefits and incentive, insurance and stock-based compensation. The actual costs that may have been incurred if DCP had been a stand-alone company would depend on a number of factors, including the chosen organizational structure and strategic decisions made as to information technology and infrastructure requirements. As such, DCP’s combined financial statements do not necessarily reflect what DCP’s financial condition and results of operations would have been had DCP operated as a stand-alone company during the period or at the date presented.

The unaudited pro forma condensed combined financial statements do not reflect any benefits that may result from realization of approximately $250 million of annualized cost synergies expected to be realized within three years following the consummation of the Transactions, or, if Olin is able to increase sales to new third-party customers and access new product markets as a result of the Transactions, the potential additional annualized synergies of up to $100 million that Olin estimates may potentially be achievable within three years from the consummation of the Transactions. During 2015, Olin incurred $29.3 million of acquisition-related integration costs.

Olin expects to incur additional one-time costs in connection with the Transactions, including approximately $100 to $120 million in acquisition-related integration costs during the first three years following the consummation of the Transactions and $200 million in incremental capital spending during the first three years following the consummation of the Transactions that Olin management believes is necessary to realize the anticipated synergies from the Transactions.

The unaudited pro forma adjustments are based upon current available information and assumptions that Olin believes to be reasonable. The pro forma adjustments and related assumptions are described in the accompanying notes presented on the following pages.

The unaudited pro forma condensed combined financial statements are for informational purposes only and are not intended to represent or to be indicative of the actual results of operations that the combined Olin and DCP would have reported had the Transactions been completed as of the dates set forth in the unaudited pro forma condensed combined financial statements and should not be taken as being indicative of Olin’s future consolidated results of operations. The actual results may differ significantly from those reflected in the unaudited pro forma condensed combined financial statements for a number of reasons, including, but not limited to, differences between the assumptions used to prepare the unaudited pro forma condensed combined financial statements and actual amounts. As a result, the pro forma combined information does not purport to be indicative of what the financial condition or results of operations would have been had the Transactions been completed on the applicable dates of the unaudited pro forma condensed combined financial statements.

The unaudited pro forma condensed combined financial statements, including the notes thereto, should be read in conjunction with:

• the accompanying notes to the unaudited pro forma condensed combined financial statements;

• Olin’s audited historical consolidated financial statements and related notes as of and for the year ended December 31, 2015, which are included in Olin’s Annual Report on Form 10-K for the fiscal year ended December 31, 2015 (filed with the SEC on March 1, 2016);

• Olin’s unaudited historical consolidated financial statements and related notes as of and for the three months ended March 31, 2016, which are included in Olin’s Quarterly Report on Form 10-Q for the period ended March 31, 2016 (filed with the SEC on May 3, 2016);

• DCP’s audited historical combined financial statements and related notes as of and for the year ended December 31, 2014, which are included in Olin’s Registration Statement on Form S-4 (Registration No. 333-203990) declared effective by the SEC on September 2, 2015; and

• DCP’s unaudited historical combined financial statements and related notes as of and for the nine months ended September 30, 2015, which are included in Exhibit 99.3 to Olin’s Current Report on Form 8-K filed with the SEC on July 29, 2016.

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Unaudited pro forma condensed combined statement of operations for the year ended December 31, 2015

	Olin Corporation			Historical Dow Chlorine Products Business			Pro forma adjustments			Note 2	Pro forma condensed combined
				(in millions, except per share data)
Sales	$	2,854.4		$	2,843.0		$	(15.6	)	A	$	5,681.8
Operating expenses
Cost of goods sold		2,486.8			2,707.0			42.0		B		5,235.8
Selling and administration		186.5			116.0			(10.2	)	C		292.3
Restructuring charges		2.7			—			—				2.7
Acquisition-related costs		123.4			—			(94.1	)	D		29.3
Other operating income		45.7			—			—				45.7
Operating income (loss)		100.7			20.0			46.7				167.4
Earnings of non-consolidated affiliates		1.7			—			—				1.7
Interest expense		97.0			9.0			82.4		E		188.4
Interest income		1.1			—			—				1.1
Other income		0.2			(1.0	)		—				(0.8	)
Income (loss) before taxes		6.7			10.0			(35.7	)			19.0
Income tax provisions (benefits)		8.1			23.0			(13.1	)	F		18.0
Net income (loss)	$	(1.4	)	$	(13.0	)	$	(22.0	)		$	(37.0	)
Net income (loss) attributable to noncontrolling interests		—			(10.0	)		10.0		G		—
Net income (loss) attributable to the business	$	(1.4	)	$	(3.0	)	$	(32.0	)		$	(37.0	)
Net income (loss) per common share attributable to the business
Basic	$	(0.01	)	$	—		$	—			$	(0.22	)
Diluted	$	(0.01	)	$	—		$	—			$	(0.22	)
Average common shares outstanding
Basic		103.4			—			61.7		H		165.1
Diluted		103.4			—			61.7		H		165.1

See accompanying notes to the unaudited pro forma condensed combined financial statements.

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Olin Corporation and subsidiaries notes to the unaudited pro forma condensed combined financial statements

Note 1. Basis of presentation

The accompanying unaudited pro forma condensed combined financial statements were prepared in accordance with Article 11 of Regulation S-X and present the pro forma combined results of operations of Olin based upon the historical financial statements of each of Olin and DCP, after giving effect to the Merger and the other Transactions, and are intended to reflect the impact of the Merger and the other Transactions on Olin’s consolidated financial statements. The accompanying unaudited pro forma condensed combined financial statements have been prepared using, and should be read in conjunction with, the unaudited combined financial statements of DCP as of and for the nine months ended September 30, 2015 and the audited consolidated financial statements of Olin as of and for the year ended December 31, 2015. Assumptions and estimates underlying the pro forma adjustments are described in these notes. Since the accompanying unaudited pro forma condensed combined financial statements have been prepared based upon preliminary estimates and assumptions, the final amounts recorded may change these estimates as a more in-depth analysis is in the process of being completed now that the Transactions have closed and such differences may be material.

The accompanying unaudited pro forma condensed combined financial statements are presented for illustrative purposes only and do not purport to be indicative of the actual results that would have been achieved by Olin if the Transactions had been consummated for the periods presented or that will be achieved in the future. The unaudited pro forma condensed combined financial statements do not reflect adjustments for the costs of any integration activities or benefits that may result from realization of synergies expected to result from the Transactions. In addition, throughout the period presented in the unaudited pro forma condensed combined financial statements, the operations of DCP were conducted and accounted for as part of TDCC. DCP’s audited condensed financial statements have been derived from TDCC’s historical accounting records and reflect certain allocations of direct costs and expenses. All of the allocations and estimates in such financial statements are based on assumptions that the management of TDCC believes are reasonable. In the opinion of management, the unaudited pro forma condensed combined financial statements include all normal and recurring adjustments that are considered necessary for the fair presentation of the results for the period presented. DCP’s financial statements do not necessarily represent the financial position of DCP had it been operated as a stand-alone company during the period or at the date presented.

The unaudited pro forma condensed combined statement of operations combines the historical consolidated statement of operations of Olin for the year ended December 31, 2015, which reflects the operations of DCP for the period following the closing date of the Merger, and the historical combined statement of income (loss) of DCP for the nine months ended September 30, 2015, giving effect to the Merger and the other Transactions as if they had been consummated on January 1, 2015.

The unaudited pro forma condensed combined financial statements were prepared using the acquisition method of accounting with Olin considered the acquirer of DCP. The audited historical combined financial statements of DCP have been adjusted to reflect certain reclassifications in order to conform to Olin’s financial statement presentation.

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Note 2. Income statement adjustments

The unaudited pro forma condensed combined statement of operations reflects the following adjustments (in millions):

(A) Sales were adjusted as follows:

	For the year ended December 31, 2015
Excluded assets/liabilities (1)	$	(110.0	)
Re-pricing of sales to TDCC (2)		80.0
Olin and DCP eliminations (3)		(9.0	)
Stub period adjustment (4)		23.4
Total pro forma adjustment to sales	$	(15.6	)

(1) Relates to adjustments to sales related to operations and commercial arrangements that were not transferred and commercial arrangements transferred in accordance with the Separation Agreement.

(2) Represents the re-pricing of sales to TDCC relating to arrangements for long-term supply agreements for the sale of raw materials and services pursuant to the Separation Agreement. These agreements were executed on the closing date of the Merger. This pro forma adjustment represents changes in sales that would have been generated due to these agreements had they been in place on January 1, 2015.

(3) Represents the elimination of DCP’s sales to Olin as reported in DCP’s historical statement of operations. There were no sales transactions from Olin to DCP for the period in 2015 prior to the closing date of the Merger.

(4) Represents the sales from September 30, 2015, the last date of the third quarter reporting period, to October 5, 2015, the closing date of the Merger.

(B) Cost of goods sold were adjusted as follows:

	For the year ended December 31, 2015
Adjustment to depreciation and amortization of DCP assets acquired (1)	$	107.7
Excluded assets/liabilities (2)		(70.0	)
Re-pricing of raw materials and services to/from DCP/TDCC (3)		18.0
Olin and DCP eliminations (4)		(9.0	)
Inventory step-up (5)		(24.0	)
Stub period adjustment (6)		19.3
Total pro forma adjustment to cost of goods sold	$	42.0

(1) Represents the adjustment to DCP’s historical depreciation and amortization as a result of preliminary fair value adjustments to the acquired depreciable assets and amortizable intangible assets and adjustments to their respective estimated remaining useful lives.

(2) Represents adjustments to expenses related to operations and commercial arrangements that were not transferred and additional assets and commercial arrangements transferred in accordance with the Separation Agreement. This adjustment also includes a reduction of $9 million for the period prior to the closing date of the Merger associated with environmental expenses that were attributable to production sites not being transferred.

(3) Relates to arrangements for long-term supply agreements for raw materials, including ethylene and benzene, and services pursuant to the Separation Agreement. These agreements were executed on the closing date of the Merger. This pro forma adjustment represents changes in raw material costs and operating expenses that would have been incurred due to these agreements had they been in place on January 1, 2015.

(4) Represents the elimination of DCP’s sales to Olin as reported in DCP’s historical statement of operations. There were no sales transactions from Olin to DCP for period prior to the closing date of the Merger.

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(5) Represents the removal of the inventory step-up from cost of goods sold as it will not have a continuing impact on Olin.

(6) Represents the cost of goods sold from September 30, 2015, the last date of third quarter reporting period, to October 5, 2015, the closing date of the Merger.

(C) Selling and administration was adjusted as follows:

	For the year ended December 31, 2015
Excluded assets/liabilities (1)	$	(4.0	)
Re-pricing of services to/from DCP/TDCC (2)		(5.0	)
Non-qualified pension change in control (3)		(2.7	)
Stub period adjustment (4)		1.5
Total pro forma adjustment to selling and administration	$	(10.2	)

(1) Represents adjustments to expenses related to operations that were not transferred in accordance with the Separation Agreement.

(2) Relates to arrangements for services between DCP and TDCC following the consummation of the Transactions pursuant to the Separation Agreement. These agreements were executed on the closing date of the Merger. This pro forma adjustment represents changes in operating expenses that would have been incurred due to these agreements had they been in place on January 1, 2015.

(3) Relates to the elimination of the Olin non-qualified pension expense incurred for the year ended December 31, 2015. The plan with which these expenses were associated was terminated as a direct result of the Merger, which triggered a change in control clause for the pension plan. As a result, these expenses are not expected to have a continuing impact on results following the consummation of the Transactions.

(4) Represents the selling and administration expenses from September 30, 2015, the last date of the third quarter reporting period, to October 5, 2015, the closing date of the Merger.

(D) Acquisition-related costs were adjusted as follows:

	For the year ended December 31, 2015
Transaction costs (1)	$	(94.1	)
Total pro forma adjustment to acquisition-related costs	$	(94.1	)

(1) Relates to $47.0 million of advisory, legal, accounting and other professional fees and $47.1 million of costs associated with the change in control mandatory acceleration of expenses under deferred compensation plans as a result of the Transactions for the year ended December 31, 2015, which are directly attributable to the Merger, but which are not expected to have a continuing impact on results following the consummation of the Transactions.

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(E) Interest Expense

	For the year ended December 31, 2015
Blue Cube Securities	$	90.2
Senior Term Loan Facility (1)(2)		19.2
Sumitomo Term Facility (1)(3)		10.0
Olin term loan repayment (4)		(1.9	)
JV entity debt Repayment (5)		(9.0	)
Olin Revolving Facility (6)		0.9
Amortization of new debt issuance costs (1)		(27.0	)
Total pro forma adjustment to interest expense	$	82.4

(1) For each one-eighth of 1% change in estimated interest rate associated with the $1,350 million in borrowings under the Senior Term Facility and the $600 million in borrowings under the Sumitomo Term Facility, interest expense would increase or decrease by approximately $2.4 million for the year ended December 31, 2015.

(2) Olin and Blue Cube obtained $1,350 million of separate commitments for term loans and drew the entire amount in order to finance the Transactions. The annual average interest rate included in the unaudited pro forma condensed combined statement of operations with respect to the Senior Term Facility is based on the terms of the commitments.

(3) Olin obtained $600 million of commitments for term loans and drew the entire amount in order to refinance indebtedness of the JV entity under the JV Credit Agreement and to pay fees and expenses of Olin and make other payments in connection with the Transactions. The annual average interest rate included in the unaudited pro forma condensed combined statement of operations with respect to the Sumitomo Term Facility is based on the terms of the commitments.

(4) Represents repayment by Olin of the term loans outstanding under Olin’s Existing Credit Facilities. These term loans were repaid with the proceeds of the new indebtedness incurred by Olin.

(5) Represents repayment by Olin of the indebtedness of the JV Entity under the JV Credit Agreement. The debt was repaid with the proceeds of the new indebtedness incurred by Olin.

(6) Olin obtained a $500 million commitment for a senior unsecured revolving credit facility. These commitments were not drawn on for purposes of the Transactions, and the $0.9 million interest expense for the year ended December 31, 2015 relates to commitment fees on the undrawn Olin Revolving Facility.

(F) For purposes of the unaudited pro forma condensed combined financial statements, a global blended statutory tax rate of approximately 37% has been used. This does not reflect Olin’s effective tax rate, which will include other tax items such as state and foreign taxes as well as other tax charges and benefits, and does not take into account any historical or possible future tax events that may impact Olin following the consummation of the Transactions.

(G) Represents the elimination of income attributable to noncontrolling interest due to the JV Partner’s exercise of its right for a Tag Event.

(H) The adjustment to both weighted average shares outstanding and diluted weighted average shares outstanding is to reflect the 87.5 million shares of Olin common stock issued in the Merger. For purposes of the unaudited pro forma condensed combined statement of operations for the year ended December 31, 2015, the dilutive impacts of stock-based compensation of 5.2 million shares have been excluded from the calculation of the pro forma diluted loss per share, as the effect of including them would have been anti-dilutive.

7

HELPFUL DEFINITIONS

• “Blue Cube” means Blue Cube Spinco Inc., a Delaware corporation, a wholly-owned subsidiary of Olin and, prior to the Merger, a wholly-owned subsidiary of TDCC;

• “Blue Cube Securities” means the notes that were issued by Blue Cube to TDCC immediately prior to the Distribution in connection with the Transactions;

• “Contribution” means the contribution by TDCC, directly or indirectly, of the equity interests in the DCP Subsidiaries to Blue Cube pursuant to the Separation Agreement;

• “DCP Subsidiaries” refers to the direct and indirect subsidiaries of TDCC that were formed for purposes of holding the transferred assets and certain assumed liabilities related to DCP following the Separation and were contributed to Blue Cube prior to the consummation of the Distribution, pursuant to the Contribution;

• “Distribution” means the distribution by TDCC of its shares of Blue Cube common stock to the holders of shares of TDCC common stock by way of an exchange offer;

• “Dow Chlorine Products Business” or “DCP” means TDCC’s U.S. chlor-alkali and vinyl, global epoxy and global chlorinated organics business, including TDCC’s equity interests in the JV Entity, each of which were formerly owned by TDCC and subsequently acquired by Olin;

• “Existing Credit Facilities” means Olin’s $410 million senior credit facilities, dated June 24, 2014;

• “JV Credit Agreement” means the Credit Agreement governing the existing indebtedness of the JV Entity;

• “JV Entity” means Dow-Mitsui Chlor-Alkali LLC, a joint venture between TDCC and Mitsui & Co. Texas Chlor-Alkali, Inc.;

• “JV Partner” means Mitsui & Co. Texas Chlor-Alkali, Inc.;

• “Merger” means the combination of Olin’s business and the Dow Chlorine Products Business through the merger of Merger Sub with and into Blue Cube, whereby the separate corporate existence of Merger Sub ceased and Blue Cube continued as the surviving company and as a wholly-owned subsidiary of Olin, as contemplated by the Merger Agreement;

• “Merger Agreement” means the Agreement and Plan of Merger, dated as of March 26, 2015, among TDCC, Blue Cube, Olin and Merger Sub;

• “Merger Sub” means Blue Cube Acquisition Corp., a Delaware corporation and formerly a wholly-owned subsidiary of Olin that was formed for purposes of the Merger;

• “Olin” means Olin Corporation and its subsidiaries, including Blue Cube and its subsidiaries, unless the context otherwise requires;

• “Olin Revolving Facility” means the revolving facility under the Amended and Restated Credit Agreement, dated as of October 5, 2015, by and among Olin, Blue Cube, Olin Canada ULC, Wells Fargo Bank, National Association, as administrative agent, and the lenders named therein;

8

• “Senior Term Facility” means the term facility under the Amended and Restated Credit Agreement, dated as of October 5, 2015, by and among Olin, Blue Cube, Olin Canada ULC, Wells Fargo Bank, National Association, as administrative agent, and the lenders named therein;

• “Separation” means the transfer by TDCC to Blue Cube or the DCP Subsidiaries directly or indirectly of the transferred assets and certain assumed liabilities related to DCP pursuant to the Separation Agreement;

• “Separation Agreement” means the Separation Agreement, dated as of March 26, 2015, among TDCC and Blue Cube;

• “Sumitomo Term Facility” means the term facility under the credit agreement, dated as of August 25, 2015 (as amended, supplemented or otherwise modified from time to time), among Blue Cube, Olin and the agents and lenders named therein;

• “Tag Event” means the exercise by the JV Partner prior to the closing date of the Merger of its right to transfer all of its equity interests in the JV Entity to TDCC or TDCC’s designee in connection with the Transactions pursuant to the organizational documents of the JV Entity;

• “TDCC” means The Dow Chemical Company, a Delaware corporation; and

• “Transactions” means the transactions contemplated by the Merger Agreement and the Separation Agreement, which provide for, among other things, the Separation, the Contribution, the Distribution and the Merger.

9

XML

Document And Entity Information	3 Months Ended
	Mar. 31, 2016
Document and Entity Information [Abstract]
Entity Registrant Name	Olin Corporation
Entity Central Index Key	0000074303
Document Type	8-K
Document Period End Date	Mar. 31, 2016
Amendment Flag	false

XML

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 315.6	$ 392.0	$ 196.8	$ 256.8
Receivables, net	813.2	783.4	303.8	263.1
Income taxes receivable	36.3	32.9	15.1	21.6
Inventories	679.5	685.2	216.1	210.1
Current deferred income taxes	0.0	0.0	54.0	54.2
Other current assets	32.8	39.9	17.4	10.3
Total current assets	1,877.4	1,933.4	803.2	816.1
Property, plant and equipment, net	3,859.0	3,953.4	919.9	931.0
Deferred income taxes	107.4	95.9	12.9	12.5
Other assets	463.8	454.6	70.2	59.0
Intangible assets, net	663.2	677.5	119.8	123.5
Goodwill	2,146.1	2,174.1	747.1	747.1
Total assets	9,116.9	9,288.9	2,673.1	2,689.2
Current liabilities:
Current installments of long-term debt	205.1	205.0	16.4	16.4
Accounts payable	478.1	608.2	147.8	146.8
Income taxes payable	14.1	4.9	1.1	0.2
Accrued liabilities	352.3	328.1	205.1	214.3
Total current liabilities	1,049.6	1,146.2	370.4	377.7
Long-term debt	3,627.9	3,643.8	648.7	649.8
Accrued pension liability	635.2	648.9	167.2	182.0
Deferred income taxes	1,091.0	1,095.2	107.3	107.1
Other liabilities	340.4	336.0	361.3	359.3
Total liabilities	6,744.1	6,870.1	1,654.9	1,675.9
Commitments and contingencies
Shareholders' equity:
Commons stock, par value $1 per share: Authorized, 240.0 shares (120.0 in 2014); Issued and outstanding, 165.1 shares (77.4 in 2014)	165.2	165.1	77.5	77.4
Additional paid-in capital	2,238.9	2,236.4	792.1	788.3
Accumulated other comprehensive loss	(470.2)	(492.5)	(439.7)	(443.1)
Retained earnings	438.9	509.8	588.3	590.7
Total shareholders' equity	2,372.8	2,418.8	1,018.2	1,013.3
Total liabilities and shareholders' equity	$ 9,116.9	$ 9,288.9	$ 2,673.1	$ 2,689.2

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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Millions, $ in Millions	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ 1,587.9	$ 1,499.4	$ 1,357.9	$ 1,330.7
Shareholders' Equity:
Common stock, par value (in dollars per share)	$ 1.00	$ 1.00	$ 1.00	$ 1.00
Common stock, authorized (in shares)	240.0	240.0	120.0	120.0
Common stock, issued (in shares)	165.2	165.1	77.5	77.4
Common stock, outstanding (in shares)	165.2	165.1	77.5	77.4

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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended									12 Months Ended			62 Months Ended	65 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Mar. 31, 2016
Income Statement [Abstract]
Sales	$ 1,348.2	$ 1,267.4	$ 533.6	$ 535.4	$ 518.0	$ 499.8	$ 593.6	$ 570.4	$ 577.4	$ 2,854.4	$ 2,241.2	$ 2,515.0
Operating expenses:
Cost of goods sold	1,175.4	1,148.1	460.0	445.5	433.2	421.9	492.3	463.6	475.4	2,486.8	1,853.2	2,033.7
Selling and administration	88.1				47.0					186.5	166.2	190.0
Restructuring charges	92.8				1.2					2.7	15.7	5.5	$ 77.3	$ 129.5
Acquisition-related costs	10.2				10.4					123.4	4.2	0.0
Other operating income	10.9				(0.2)					45.7	1.5	0.7
Operating income	(7.4)				26.0					100.7	203.4	286.5
Earnings of non-consolidated affiliates	(0.2)				(0.4)					(1.7)	(1.7)	(2.8)
Interest expense	48.5				7.1					97.0	43.8	38.6
Interest income	0.3				0.3					1.1	1.3	0.6
Other income (expense)										0.2	0.1	(1.3)
Income from continuing operations before taxes	(55.4)				19.6					6.7	162.7	250.0
Income tax provision	(17.5)				6.5					8.1	57.7	71.4
Income from continuing operations						12.8	26.1	36.6	29.5	(1.4)	105.0	178.6
Income from discontinued operations, net						0.0	0.0	0.7	0.0	0.0	0.7	0.0
Net income	$ (37.9)	$ (62.7)	$ 5.9	$ 42.3	$ 13.1	$ 12.8	$ 26.1	$ 37.3	$ 29.5	$ (1.4)	$ 105.7	$ 178.6
Basic income per common share:
Income from continuing operations						$ 0.16	$ 0.33	$ 0.46	$ 0.37	$ (0.01)	$ 1.33	$ 2.24
Income from discontinued operations, net						0.00	0.00	0.01	0.00	0.00	0.01	0.00
Net income	$ (0.23)	$ (0.39)	$ 0.08	$ 0.55	$ 0.17	0.16	0.33	0.47	0.37	(0.01)	1.34	2.24
Diluted income per common share:
Income from continuing operations						0.16	0.33	0.46	0.37	(0.01)	1.32	2.21
Income from discontinued operations, net						0.00	0.00	0.01	0.00	0.00	0.01	0.00
Net income	(0.23)	(0.39)	0.08	0.54	0.17	0.16	0.33	0.47	0.37	(0.01)	1.33	$ 2.21
Common Stock, Dividends, Per Share, Declared	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.80	$ 0.80
Average common shares outstanding:
Basic	165.1				77.4					103.4	78.6	79.9
Diluted	165.1				78.5					103.4	79.7	80.9

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended									12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Consolidated Statement of Comprehensive Income [Abstract]
Net income	$ (37.9)	$ (62.7)	$ 5.9	$ 42.3	$ 13.1	$ 12.8	$ 26.1	$ 37.3	$ 29.5	$ (1.4)	$ 105.7	$ 178.6
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments, net	15.5				(1.4)					(9.8)	(1.8)	(2.6)
Unrealized losses on derivative contracts, net	3.0				(0.3)					(2.7)	(5.1)	(3.8)
Pension and postretirement liability adjustments, net										(78.8)	(86.6)	(7.7)
Amortization of prior service costs and actuarial losses, net	3.8				5.1					41.9	15.5	20.3
Total other comprehensive (loss) income, net of tax	22.3				3.4					(49.4)	(78.0)	6.2
Comprehensive (loss) income	$ (15.6)				$ 16.5					$ (50.8)	$ 27.7	$ 184.8

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CONSOLIDATED 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, 2012		80.2
Balance at Dec. 31, 2012	$ 998.4	$ 80.2	$ 856.1	$ (371.3)	$ 433.4
Net income	178.6	0.0	0.0	0.0	178.6
Total other comprehensive (loss) income, net of tax	6.2	0.0	0.0	6.2	0.0
Dividends paid:
Common stock ($0.80 per share)	$ (64.0)	$ 0.0	0.0	0.0	(64.0)
Common stock repurchased and retired (in shares)	(1.5)	(1.5)
Common stock repurchased and retired	$ (36.2)	$ (1.5)	(34.7)	0.0	0.0
Common stock issued for:
Stock options exercised (in shares)	0.5	0.5
Stock options exercised	$ 9.7	$ 0.5	9.2	0.0	0.0
Other transactions (in shares)		0.2
Other transactions	3.2	$ 0.2	3.0	0.0	0.0
Stock-based compensation	5.2	$ 0.0	5.2	0.0	0.0
Balance (in shares) at Dec. 31, 2013		79.4
Balance at Dec. 31, 2013	1,101.1	$ 79.4	838.8	(365.1)	548.0
Net income	105.7	0.0	0.0	0.0	105.7
Total other comprehensive (loss) income, net of tax	(78.0)	0.0	0.0	(78.0)	0.0
Dividends paid:
Common stock ($0.80 per share)	$ (63.0)	$ 0.0	0.0	0.0	(63.0)
Common stock repurchased and retired (in shares)	(2.5)	(2.5)
Common stock repurchased and retired	$ (64.8)	$ (2.5)	(62.3)	0.0	0.0
Common stock issued for:
Stock options exercised (in shares)	0.5	0.5
Stock options exercised	$ 12.1	$ 0.5	11.6	0.0	0.0
Other transactions (in shares)		0.0
Other transactions	(1.4)	$ 0.0	(1.4)	0.0	0.0
Stock-based compensation	1.6	$ 0.0	1.6	0.0	0.0
Balance (in shares) at Dec. 31, 2014		77.4
Balance at Dec. 31, 2014	1,013.3	$ 77.4	788.3	(443.1)	590.7
Net income	13.1	0.0	0.0	0.0	13.1
Total other comprehensive (loss) income, net of tax	3.4	0.0	0.0	3.4	0.0
Dividends paid:
Common stock ($0.80 per share)	$ (15.5)	$ 0.0	0.0	0.0	(15.5)
Common stock repurchased and retired (in shares)	0.0
Common stock repurchased and retired	$ 0.0
Common stock issued for:
Stock options exercised (in shares)	0.1	0.1
Stock options exercised	$ 2.8	$ 0.1	2.7	0.0	0.0
Other transactions (in shares)		0.0
Other transactions	(0.2)	$ 0.0	(0.2)	0.0	0.0
Stock-based compensation	1.3	$ 0.0	1.3	0.0	0.0
Balance (in shares) at Mar. 31, 2015		77.5
Balance at Mar. 31, 2015	1,018.2	$ 77.5	792.1	(439.7)	588.3
Balance (in shares) at Dec. 31, 2014		77.4
Balance at Dec. 31, 2014	1,013.3	$ 77.4	788.3	(443.1)	590.7
Net income	(1.4)	0.0	0.0	0.0	(1.4)
Total other comprehensive (loss) income, net of tax	(49.4)	0.0	0.0	(49.4)	0.0
Dividends paid:
Common stock ($0.80 per share)	$ (79.5)	$ 0.0	0.0	0.0	(79.5)
Common stock repurchased and retired (in shares)	0.0
Common stock repurchased and retired	$ 0.0
Common stock issued for:
Stock options exercised (in shares)	0.1	0.1
Stock options exercised	$ 3.1	$ 0.1	3.0	0.0	0.0
Other transactions (in shares)		0.1
Other transactions	2.3	$ 0.1	2.2	0.0	0.0
Business acquired in purchase transaction, net of issuance costs (in shares)		87.5
Business acquired in purchase transaction, net of issuance costs	1,525.5	$ 87.5	1,438.0	0.0	0.0
Stock-based compensation	4.9	$ 0.0	4.9	0.0	0.0
Balance (in shares) at Dec. 31, 2015		165.1
Balance at Dec. 31, 2015	2,418.8	$ 165.1	2,236.4	(492.5)	509.8
Net income	(37.9)	0.0	0.0	0.0	(37.9)
Total other comprehensive (loss) income, net of tax	22.3	0.0	0.0	22.3	0.0
Dividends paid:
Common stock ($0.80 per share)	$ (33.0)	$ 0.0	0.0	0.0	(33.0)
Common stock repurchased and retired (in shares)	0.0
Common stock repurchased and retired	$ 0.0
Common stock issued for:
Other transactions (in shares)		0.1
Other transactions	1.0	$ 0.1	0.9	0.0	0.0
Stock-based compensation	1.6	$ 0.0	1.6	0.0	0.0
Balance (in shares) at Mar. 31, 2016		165.2
Balance at Mar. 31, 2016	$ 2,372.8	$ 165.2	$ 2,238.9	$ (470.2)	$ 438.9

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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Stockholders' Equity [Abstract]
Dividends paid (in dollars per share)	$ 0.20	$ 0.20	$ 0.80	$ 0.80	$ 0.80

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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Activities
Net income	$ (37.9)	$ 13.1	$ (1.4)	$ 105.7	$ 178.6
Adjustments to reconcile net income to net cash and cash equivalents provided by (used for) operating activities:
Earnings of non-consolidated affiliates	(0.2)	(0.4)	(1.7)	(1.7)	(2.8)
Gain on disposition of non-consolidated affiliate			0.0	0.0	(6.5)
Gains on disposition of property, plant and equipment	0.2	0.3	(25.2)	(1.1)	(0.4)
Stock-based compensation	2.2	1.8	7.6	5.1	8.8
Depreciation and amortization	129.7	34.4	228.9	139.1	135.3
Deferred income taxes	(14.7)	(3.1)	5.6	31.0	12.4
Write-off of equipment and facility included in restructuring charges	76.6	0.0	0.5	3.3	0.0
Qualified pension plan contributions	(0.5)	(0.2)	(0.9)	(0.8)	(1.0)
Qualified pension plan income	(9.0)	(6.8)	(32.0)	(28.5)	(24.1)
Change in assets and liabilities:
Receivables	(16.8)	(40.7)	(115.1)	25.8	18.9
Income taxes receivable/payable	5.6	7.4	(12.6)	(27.8)	0.4
Inventories	6.3	(6.0)	(1.7)	(23.6)	8.6
Other current assets	6.5	(7.1)	(30.6)	1.7	0.7
Accounts payable and accrued liabilities	(99.7)	(6.3)	185.1	(38.5)	1.0
Other assets	2.1	0.1	37.6	5.2	1.3
Other noncurrent liabilities	(0.3)	2.4	(32.5)	(33.2)	(14.5)
Other operating activities	(3.1)	1.5	5.5	(2.5)	0.3
Net operating activities	47.0	(9.6)	217.1	159.2	317.0
Investing Activities
Capital expenditures	(76.1)	(23.3)	(130.9)	(71.8)	(90.8)
Business acquired and related transactions, net of cash acquired			(408.1)	0.0	0.0
Proceeds from sale/leaseback of equipment			0.0	0.0	35.8
Proceeds from disposition of property, plant and equipment	0.1	0.6	26.2	5.6	4.6
Distributions from affiliated companies, net	2.2	2.2	8.8	0.0	1.5
Restricted cash activity, net			0.0	4.2	7.7
Other investing activities	0.0	(1.4)	0.0	0.3	(2.6)
Net investing activities	(73.8)	(21.9)	(504.0)	(61.7)	(43.8)
Long-term debt:
Borrowings			1,275.0	150.0	0.0
Repayments	17.1	1.0	730.7	162.4	23.7
Financing portion of earn out payment - SunBelt			0.0	(14.8)	(17.1)
Common stock repurchased and retired			0.0	(64.8)	(36.2)
Stock options exercised	0.0	2.0	2.2	6.6	8.8
Excess tax benefits from stock-based compensation	0.0	0.3	0.4	1.1	1.6
Dividends paid	(33.0)	(15.5)	(79.5)	(63.0)	(64.0)
Debt and equity issuance costs	0.0	(14.3)	(45.2)	(1.2)	0.0
Net financing activities	(50.1)	(28.5)	422.2	(148.5)	(130.6)
Effect of exchange rate changes on cash and cash equivalents	0.5	0.0	(0.1)	0.0	0.0
Net increase (decrease) in cash and cash equivalents	(76.4)	(60.0)	135.2	(51.0)	142.6
Cash and cash equivalents, beginning of year	392.0	256.8	256.8	307.8	165.2
Cash and cash equivalents, end of year	315.6	196.8	392.0	256.8	307.8
Cash paid for interest and income taxes:
Interest	17.3	6.6	32.3	36.8	37.2
Income taxes, net of refunds	3.6	1.6	$ 5.3	$ 49.0	$ 61.3
Capital Expenditures Incurred but Not yet Paid	$ 2.1	$ 2.4

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DESCRIPTION OF BUSINESS

3 Months Ended

12 Months Ended

Mar. 31, 2016

Dec. 31, 2015

Organization, Consolidation and Presentation of Financial Statements [Abstract]

DESCRIPTION OF BUSINESS

DESCRIPTION OF BUSINESS

Olin Corporation (Olin) is a Virginia corporation, incorporated in 1892, having its principal executive offices in Clayton, MO. On October 5, 2015 (the Closing Date), we acquired from The Dow Chemical Company (TDCC) 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. For segment reporting purposes, a portion of the Acquired Business’s operating results comprise the newly created Epoxy segment with the remaining operating results combined with Olin’s former Chlor Alkali Products and Chemical Distribution segments to comprise the newly created Chlor Alkali Products and Vinyls segment.

We are a manufacturer concentrated in three business segments: Chlor Alkali Products and Vinyls, Epoxy and Winchester. Chlor Alkali Products and Vinyls manufactures and sells chlorine and caustic soda, ethylene dichloride 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 and downstream products such as converted epoxy resins and additives. The Winchester segment products include 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 consolidated 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, 2015. Certain reclassifications were made to prior year amounts to conform to the 2016 presentation.

DESCRIPTION OF BUSINESS

Olin Corporation is a Virginia corporation, incorporated in 1892, having its principal executive offices in Clayton, MO.  On October 5, 2015 (the Closing Date), we acquired from The Dow Chemical Company (TDCC) 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. For segment reporting purposes, a portion of the Acquired Business’s operating results comprise the newly created Epoxy segment with the remaining operating results combined with Olin’s Chlor Alkali Products and Chemical Distribution segments to comprise the newly created Chlor Alkali Products and Vinyls segment.

We are a manufacturer concentrated in three business segments:  Chlor Alkali Products and Vinyls, Epoxy and Winchester.  Chlor Alkali Products and Vinyls manufactures and sells chlorine and caustic soda, ethylene dichloride 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 and downstream products such as converted epoxy resins and additives. The Winchester segment products include sporting ammunition, reloading components, small caliber military ammunition and components, and industrial cartridges.  See our discussion of our segment disclosures contained in Item 7—“Management’s Discussion and Analysis of Financial Condition and Results of Operations” to Olin’s Annual Report on Form 10-K for the year ended December 31, 2015.

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ACCOUNTING POLICIES

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

ACCOUNTING POLICIES

ACCOUNTING POLICIES

The preparation of the consolidated financial statements requires estimates and assumptions that affect amounts reported and disclosed in the financial statements and related notes.  Actual results could differ from those estimates.

Basis of Presentation

The consolidated financial statements include the accounts of Olin Corporation and all majority-owned subsidiaries. Investment in our affiliates are accounted for on the equity method.  Accordingly, we include only our share of earnings or losses of these affiliates in consolidated net (loss) income.  Certain reclassifications were made to prior year amounts to conform to the 2015 presentation.

Revenue Recognition

Revenues are recognized on sales of product at the time the goods are shipped and the risks of ownership have passed to the customer.  Shipping and handling fees billed to customers are included in sales.  Allowances for estimated returns, discounts and rebates are recognized when sales are recorded and are based on various market data, historical trends and information from customers.  Actual returns, discounts and rebates have not been materially different from estimates.

Cost of Goods Sold and Selling and Administration Expenses

Cost of goods sold includes the costs of inventory sold, related purchasing, distribution and warehousing costs, costs incurred for shipping and handling, depreciation and amortization expense related to these activities and environmental remediation costs and recoveries.  Selling and administration expenses include personnel costs associated with sales, marketing and administration, research and development, legal and legal-related costs, consulting and professional services fees, advertising expenses, depreciation expense related to these activities, foreign currency translation and other similar costs.

Other Operating Income

Other operating income consists of miscellaneous operating income items, which are related to our business activities, and (losses) gains on disposition of property, plant and equipment.

Included in other operating income were the following:

	Years Ended December 31,
	2015			2014		2013
	($ in millions)
(Losses) gains on disposition of property, plant and equipment, net	$	(0.6	)	$	0.2	$	(1.1	)
Gains on dispositions of former manufacturing facilities	—			—		1.5
Gains on insurance recoveries	46.0			—		—
Gain on resolution of a contract matter	—			1.0		—
Other	0.3			0.3		0.3
Other operating income	$	45.7		$	1.5	$	0.7

The gains on insurance recoveries in 2015 included insurance recoveries for property damage and business interruption of $42.3 million related to the portion of the Becancour, Canada chlor alkali facility that has been shut down since late June 2014 and $3.7 million related to the McIntosh, AL chlor alkali facility.

Other Income (Expense)

Other income (expense) consists of non-operating income items which are not related to our primary business activities.  Other income (expense) in 2013 included $7.9 million of expense for our earn out liability from the acquisition of the remaining 50% of the SunBelt Chlor Alkali Partnership, which we refer to as SunBelt. Other income (expense) in 2013 also included a gain of $6.5 million on the sale of our equity interest in a bleach joint venture.

Foreign Currency Translation

Our worldwide operations utilize the U.S. dollar (USD) or local currency as the functional currency, where applicable. For foreign entities where the USD is the functional currency, gains and losses resulting from balance sheet translations are included in selling and administration. For foreign entities where the local currency is the functional currency, assets and liabilities denominated in local currencies are translated into USD at end-of-period exchange rates and the resultant translation adjustments are included in accumulated other comprehensive loss. Assets and liabilities denominated in other than the local currency are remeasured into the local currency prior to translation into USD and the resultant exchange gains or losses are included in income in the period in which they occur. Income and expenses are translated into USD using an approximation of the average rate prevailing during the period. We change the functional currency of our separate and distinct foreign entities only when significant changes in economic facts and circumstances indicate clearly that the functional currency has changed.

Cash and Cash Equivalents

All highly liquid investments, with a maturity of three months or less at the date of purchase, are considered to be cash equivalents.

Short-Term Investments

We classify our marketable securities as available-for-sale, which are reported at fair market value with unrealized gains and losses included in accumulated other comprehensive loss, net of applicable taxes.  The fair value of marketable securities is determined by quoted market prices.  Realized gains and losses on sales of investments, as determined on the specific identification method, and declines in value of securities judged to be other-than-temporary are included in other income (expense) in the consolidated statements of operations.  Interest and dividends on all securities are included in interest income and other income (expense), respectively.

Allowance for Doubtful Accounts Receivable

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.

Inventories

Inventories are valued at the lower of cost or market. For U.S. inventories, inventory costs are determined principally by the dollar value 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 include raw materials, direct labor and manufacturing overhead.

Property, Plant and Equipment

Property, plant and equipment are recorded at cost.  Depreciation is computed on a straight-line basis over the estimated useful lives of the related assets.  Interest costs incurred to finance expenditures for major long-term construction projects are capitalized as part of the historical cost and included in property, plant and equipment and are depreciated over the useful lives of the related assets.  Leasehold improvements are amortized over the term of the lease or the estimated useful life of the improvement, whichever is shorter.  Start-up costs are expensed as incurred.  Expenditures for maintenance and repairs are charged to expense when incurred while the costs of significant improvements, which extend the useful life of the underlying asset, are capitalized.

Property, plant and equipment are reviewed for impairment when conditions indicate that the carrying values of the assets may not be recoverable.  Such impairment conditions include an extended period of idleness or a plan of disposal.  If such impairment indicators are present or other factors exist that indicate that the carrying amount of an asset may not be recoverable, we determine whether impairment has occurred through the use of an undiscounted cash flow analysis at the lowest level for which identifiable cash flows exist.  For our Chlor Alkali Products and Vinyls, Epoxy and Winchester segments, the lowest level for which identifiable cash flows exist is the operating facility level or an appropriate grouping of operating facilities level. The amount of impairment loss, if any, is measured by the difference between the net book value of the assets and the estimated fair value of the related assets.

Restricted Cash

Restricted cash, which is restricted as to withdrawal or usage, is classified on our consolidated balance sheet as a noncurrent asset separately from cash and cash equivalents.  

Asset Retirement Obligations

We record the fair value of an asset retirement obligation associated with the retirement of a tangible long-lived asset as a liability in the period incurred.  The liability is measured at discounted fair value and is adjusted to its present value in subsequent periods as accretion expense is recorded.  The corresponding asset retirement costs are capitalized as part of the carrying amount of the related long-lived asset and depreciated over the asset’s useful life.  Asset retirement obligations are reviewed annually in the fourth quarter and/or when circumstances or other events indicate that changes underlying retirement assumptions may have occurred.

The activity of our asset retirement obligation was as follows:

	December 31,
	2015			2014
	($ in millions)
Beginning balance	$	54.4		$	60.8
Accretion	3.6			3.5
Spending	(8.2		)	(11.2		)
Currency translation adjustments	(1.1		)	(0.7		)
Acquisition activity	1.7			—
Adjustments	3.1			2.0
Ending balance	$	53.5		$	54.4

At December 31, 2015 and 2014, our consolidated balance sheets included an asset retirement obligation of $46.2 million and $44.2 million, respectively, which were classified as other noncurrent liabilities.

In 2015, we had net adjustments that increased the asset retirement obligation by $3.1 million, which were primarily comprised of increases in estimated costs for certain assets. In 2014, we had net adjustments that increased the asset retirement obligation by $2.0 million, which were primarily due to changes in the estimated timing of payments for certain assets.

Comprehensive Income (Loss)

Accumulated other comprehensive loss consists of foreign currency translation adjustments, pension and postretirement liability adjustments, pension and postretirement amortization of prior service costs and actuarial losses and net unrealized (losses) gains on derivative contracts.  

Goodwill and Intangible Assets

Goodwill is not amortized, but is reviewed for impairment annually in the fourth quarter and/or when circumstances or other events indicate that impairment may have occurred.  On January 1, 2012, we adopted Accounting Standards Update (ASU) 2011-08 “Testing Goodwill for Impairment” (ASU 2011-08) which permits entities to make a qualitative assessment of whether it is more likely than not that a reporting unit’s fair value is less than its carrying amount before applying the two-step goodwill impairment test. Circumstances that are considered as part of the qualitative assessment and could trigger the two-step impairment test include, but are not limited to:  a significant adverse change in the business climate; a significant adverse legal judgment; adverse cash flow trends; an adverse action or assessment by a government agency; unanticipated competition; decline in our stock price; and a significant restructuring charge within a reporting unit.  We define reporting units at the business segment level or one level below the business segment level.  For purposes of testing goodwill for impairment, goodwill has been allocated to our reporting units to the extent it relates to each reporting unit. Based upon our qualitative assessment, it is more likely than not that the fair value of our reporting units are greater than their carrying value at December 31, 2015.  No impairment charges were recorded for 2015, 2014 or 2013.

It is our practice, at a minimum, to perform a quantitative goodwill impairment test in the fourth quarter every three years. In the fourth quarter of 2014, we performed our triennial quantitative goodwill impairment test for our reporting units. We use a discounted cash flow approach to develop the estimated fair value of a reporting unit when a quantitative test is performed.  Management judgment is required in developing the assumptions for the discounted cash flow model.  We also corroborate our discounted cash flow analysis by evaluating a market-based approach that considers earnings before interest, taxes, depreciation and amortization (EBITDA) multiples from a representative sample of comparable public companies.  As a further indicator that each reporting unit has been valued appropriately using a discounted cash flow model, the aggregate fair value of all reporting units is reconciled to the total market value of Olin. An impairment would be recorded if the carrying amount exceeded the estimated fair value.

The discount rate, profitability assumptions and terminal growth rate of our reporting units and the cyclical nature of the chlor alkali industry were the material assumptions utilized in the discounted cash flow model used to estimate the fair value of each reporting unit.  The discount rate reflects a weighted-average cost of capital, which is calculated based on observable market data.  Some of these data (such as the risk free or treasury rate and the pretax cost of debt) are based on the market data at a point in time.  Other data (such as the equity risk premium) are based uponmarket data over time for a peer group of companies in the chemical manufacturing or distribution industries with a market capitalization premium added, as applicable.

The discounted cash flow analysis requires estimates, assumptions and judgments about future events.  Our analysis uses our internally generated long-range plan.  Our discounted cash flow analysis uses the assumptions in our long-range plan about terminal growth rates, forecasted capital expenditures and changes in future working capital requirements to determine the implied fair value of each reporting unit.  The long-range plan reflects management judgment, supplemented by independent chemical industry analyses which provide multi-year industry operating and pricing forecasts.

We believe the assumptions used in our goodwill impairment analysis are appropriate and result in reasonable estimates of the implied fair value of each reporting unit. However, given the economic environment and the uncertainties regarding the impact on our business, there can be no assurance that our estimates and assumptions, made for purposes of our goodwill impairment testing will prove to be an accurate prediction of the future.  If our assumptions regarding future performance are not achieved, we may be required to record goodwill impairment charges in future periods.  It is not possible at this time to determine if any such future impairment charge would result or, if it does, whether such charge would be material.

During 2012, we adopted ASU 2012-02 “Testing Indefinite Lived Intangible Assets for Impairment” (ASU 2012-02) which permits entities to make a qualitative assessment of whether it is more likely than not that an indefinite-lived intangible asset’s fair value is less than its carrying amount before performing a quantitative impairment test. Circumstances that are considered as part of the qualitative assessment and could trigger a quantitative impairment test include, but are not limited to:  a significant adverse change in the business climate; a significant adverse legal judgment including asset specific factors; adverse cash flow trends; an adverse action or assessment by a government agency; unanticipated competition; decline in our stock price; and a significant restructuring charge within a reporting unit. Based upon our qualitative assessment, it is more likely than not that the fair value of our indefinite-lived intangible asset is greater than its carrying amount as of December 31, 2015. No impairment of our intangible assets were recorded in 2015, 2014 or 2013.

Other Assets

Included in other assets were the following:

	December 31,
	2015		2014
	($ in millions)
Investments in non-consolidated affiliates	$	25.0	$	23.3
Deferred debt issuance costs	3.3		1.4
Bleach joint venture receivable	—		7.8
Income tax receivable	1.5		6.6
Interest rate swaps	—		3.5
Supply contracts	406.5		—
Other	18.3		16.4
Other assets	$	454.6	$	59.0

In connection with the Acquisition, Olin and TDCC have agreed to enter into arrangements for the long-term supply of ethylene by TDCC to Olin, pursuant to which, among other things, Olin has made upfront payments of $433.5 million upon the Closing Date in order to receive ethylene at producer economics and for certain reservation fees for the option to obtain additional future ethylene supply at producer economics. The fair value of the long-term supply contracts recorded as of the Closing Date was a long-term asset of $410.8 million which will be amortized over the life of the contracts as ethylene is received. If the options are exercised by us, additional payments will be made to TDCC of between $230 million and $250 million on or about the fourth quarter of 2017 and between $425 million and $465 million on or about the fourth quarter of 2020, which will increase the value of the long-term asset. Amortization expense of $4.3 million was recognized within cost of goods sold in 2015 related to these supply contracts and is reflected in depreciation and amortization on the consolidated statements of cash flows. The long-term supply contracts are monitored for impairment each reporting period.

Environmental Liabilities and Expenditures

Accruals (charges to income) for environmental matters are recorded when it is probable that a liability has been incurred and the amount of the liability can be reasonably estimated, based upon current law and existing technologies.  These amounts, which are not discounted and are exclusive of claims against third parties, are adjusted periodically as assessment and remediation efforts progress or additional technical or legal information becomes available.  Environmental costs are capitalized if the costs increase the value of the property and/or mitigate or prevent contamination from future operations.

Discontinued Operations

We present the results of operations, financial position and cash flows that have either been sold or that meet the criteria for “held for sale” accounting as discontinued operations. At the time an operation qualifies for held for sale accounting, the operation is evaluated to determine whether or not the carrying value exceeds its fair value less cost to sell. Any loss as a result of carrying value in excess of fair value less cost to sell is recorded in the period the operation meets held for sale accounting. Management judgment is required to assess the criteria required to meet held for sale accounting, and estimate fair value. Changes to the operation could cause it to no longer qualify for held for sale accounting and changes to fair value or adjustments to amounts previously reported as discontinued operations could result in an increase or decrease to previously recognized losses.

Income Taxes

Deferred taxes are provided for differences between the financial statement and tax bases of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse.  A valuation allowance is provided to offset deferred tax assets if, based on the available evidence, it is more likely than not that some or all of the value of the deferred tax assets will not be realized.

Derivative Financial Instruments

We are exposed to market risk in the normal course of our business operations due to our purchases of certain commodities, our ongoing investing and financing activities and our operations that use foreign currencies.  The risk of loss can be assessed from the perspective of adverse changes in fair values, cash flows and future earnings.  We have established policies and procedures governing our management of market risks and the use of financial instruments to manage exposure to such risks.  We use hedge accounting treatment for substantially all of our business transactions whose risks are covered using derivative instruments.  The hedge accounting treatment provides for the deferral of gains or losses on derivative instruments until such time as the related transactions occur.

Concentration of Credit Risk

Accounts receivable is the principal financial instrument which subjects us to a concentration of credit risk.  Credit is extended based upon the evaluation of a customer’s financial condition and, generally, collateral is not required. Concentrations of credit risk with respect to receivables are somewhat limited due to our large number of customers, the diversity of these customers’ businesses and the geographic dispersion of such customers.  Our accounts receivable are predominantly derived from sales denominated in USD or the Euro.  We maintain an allowance for doubtful accounts based upon the expected collectibility of all trade receivables.

Fair Value

Fair value is defined as the price at which an asset could be exchanged in a current transaction between knowledgeable, willing parties or the amount that would be paid to transfer a liability to a new obligor, not the amount that would be paid to settle the liability with the creditor.  Where available, fair value is based on observable market prices or parameters or derived from such prices or parameters.  Where observable prices or inputs are not available, valuation models are applied.  These valuation techniques involve some level of management estimation and judgment, the degree of which is dependent on the price transparency for the instruments or market and the instruments’ complexity.

Assets and liabilities recorded at fair value in the consolidated balance sheets are categorized based upon the level of judgment associated with the inputs used to measure their fair value.  Hierarchical levels, defined by Accounting Standards Codification (ASC) 820 “Fair Value Measurement” (ASC 820), and directly related to the amount of subjectivity associated with the inputs to fair valuation of these assets and liabilities, are as follows:

Level 1 — Inputs were unadjusted, quoted prices in active markets for identical assets or liabilities at the measurement date.

Level 2 — Inputs (other than quoted prices included in Level 1) were either directly or indirectly observable for the asset or liability through correlation with market data at the measurement date and for the duration of the instrument’s anticipated life.

Level 3 — Inputs reflected management’s best estimate of what market participants would use in pricing the asset or liability at the measurement date.  Consideration was given to the risk inherent in the valuation technique and the risk inherent in the inputs to the model.

Retirement-Related Benefits

We account for our defined benefit pension plans and non-pension postretirement benefit plans using actuarial models required by ASC 715 “Compensation-Retirement Benefits” (ASC 715).  These models use an attribution approach that generally spreads the financial impact of changes to the plan and actuarial assumptions over the average remaining service lives of the employees in the plan.  Changes in liability due to changes in actuarial assumptions such as discount rate, rate of compensation increases and mortality, as well as annual deviations between what was assumed and what was experienced by the plan are treated as actuarial gains or losses.  The principle underlying the required attribution approach is that employees render service over their average remaining service lives on a relatively smooth basis and, therefore, the accounting for benefits earned under the pension or non-pension postretirement benefits plans should follow the same relatively smooth pattern.  Substantially all domestic defined benefit pension plan participants are no longer accruing benefits; therefore, actuarial gains and losses are amortized based upon the remaining life expectancy of the inactive plan participants.  For the years ended December 31, 2015 and 2014, the average remaining life expectancy of the inactive participants in the defined benefit pension plan was 19 years and 18 years, respectively.

One of the key assumptions for the net periodic pension calculation is the expected long-term rate of return on plan assets, used to determine the “market-related value of assets.”  The “market-related value of assets” recognizes differences between the plan’s actual return and expected return over a five year period.  The required use of an expected long-term rate of return on the market-related value of plan assets may result in a recognized pension income that is greater or less than the actual returns of those plan assets in any given year.  Over time, however, the expected long-term returns are designed to approximate the actual long-term returns and, therefore, result in a pattern of income and expense recognition that more closely matches the pattern of the services provided by the employees.  As differences between actual and expected returns are recognized over five years, they subsequently generate gains and losses that are subject to amortization over the average remaining life expectancy of the inactive plan participants, as described in the preceding paragraph.

We use long-term historical actual return information, the mix of investments that comprise plan assets, and future estimates of long-term investment returns and inflation by reference to external sources to develop the expected long-term rate of return on plan assets as of December 31.

The discount rate assumptions used for pension and non-pension postretirement benefit plan accounting reflect the rates available on high-quality fixed-income debt instruments on December 31 of each year.  The rate of compensation increase is based upon our long-term plans for such increases.  For retiree medical plan accounting, we review external data and our own historical trends for healthcare costs to determine the healthcare cost trend rates.

Stock-Based Compensation

We measure the cost of employee services received in exchange for an award of equity instruments, such as stock options, performance shares and restricted stock, based on the grant-date fair value of the award.  This cost is recognized over the period during which an employee is required to provide service in exchange for the award, the requisite service period (usually the vesting period).  An initial measurement is made of the cost of employee services received in exchange for an award of liability instruments based on its current fair value and the value of that award is subsequently remeasured at each reporting date through the settlement date.  Changes in fair value of liability awards during the requisite service period are recognized as compensation cost over that period.

The fair value of each option granted, which typically vests ratably over three years, but not less than one year, was estimated on the date of grant, using the Black-Scholes option-pricing model with the following assumptions:

	2015			2014			2013
Dividend yield	2.92		%	3.13		%	3.44		%
Risk-free interest rate	1.69		%	2.13		%	1.35		%
Expected volatility	34		%	42		%	43		%
Expected life (years)	6.0			7.0			7.0
Weighted-average grant fair value (per option)	$	6.80		$	8.34		$	7.05
Weighted-average exercise price	$	27.40		$	25.69		$	23.28
Shares granted	776,750			624,200			621,000

Dividend yield was based on a historical average.  Risk-free interest rate was based on zero coupon U.S. Treasury securities rates for the expected life of the options.  Expected volatility was based on our historical stock price movements, as we believe that historical experience is the best available indicator of the expected volatility.  Expected life of the option grant was based on historical exercise and cancellation patterns, as we believe that historical experience is the best estimate for future exercise patterns.

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RECENT ACCOUNTING PRONOUNCEMENTS

12 Months Ended

Dec. 31, 2015

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

RECENT ACCOUNTING PRONOUNCEMENTS

RECENT ACCOUNTING PRONOUNCEMENTS

In February 2016, the FASB issued ASU 2016-02 “Leases," which supersedes ASC 840 “Leases” and creates a new topic, ASC 842 "Leases." This update requires lessees to recognize a lease liability and a lease asset for all leases, including operating leases, with a term greater than 12 months on its balance sheet. The update also expands the required quantitative and qualitative disclosures surrounding leases. This update is effective for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years, with earlier application permitted. This update will be applied using a modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. We are currently evaluating the effect of this update on our consolidated financial statements.

In November 2015, the FASB issued ASU 2015-17 “Balance Sheet Classification of Deferred Taxes” (ASU 2015-17), which amends ASC 740 “Income Taxes” (ASC 740). This update requires deferred income tax liabilities and assets, and any related valuation allowance, to be classified as noncurrent on the balance sheet. This update simplified the current guidance requiring the deferred taxes for each jurisdiction to be presented as a net current asset or liability and net noncurrent asset or liability. This update is effective for fiscal years beginning after December 15, 2016 and interim periods within those fiscal years. The guidance may be applied either prospectively or retrospectively, with earlier application permitted. We adopted the provisions of ASU 2015-17 as of December 31, 2015, which was applied prospectively and therefore all prior periods have not been retrospectively adjusted.

In September 2015, the FASB issued ASU 2015-16 “Simplifying the Accounting for Measurement - Period Adjustments” which amends ASC 805 “Business Combinations.” This update requires that an acquirer in a business combination recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustments are determined. This update is effective for fiscal years beginning after December 15, 2015 and interim periods within those fiscal years. This update should be applied prospectively to adjustments of provisional amounts that occur after the effective date with earlier application permitted. The adoption of this standard could impact our consolidated financial statements as we finalize the preliminary purchase accounting for the Acquired Business.

In July 2015, the FASB issued ASU 2015-11 “Simplifying the Measurement of Inventory,” which amends ASC 330 “Inventory.” This update requires entities to measure inventory at the lower of cost and net realizable value. Net realizable value is the estimated selling prices in the ordinary course of business, less reasonable predictable costs of completion, disposal and transportation. This update simplifies the current guidance under which an entity must measure inventory at the lower of cost or market. This update does not impact inventory measured using LIFO. This update is effective for fiscal years beginning after December 15, 2016. This update will not have a material effect on our consolidated financial statements.

In April 2015, the FASB issued ASU 2015-03 “Simplifying the Presentation of Debt Issuance Costs” (ASU 2015-03) and, in August 2015, the FASB issued ASU 2015-15 “Interest-Imputation of Interest” (ASU 2015-15), which both amend ASC 835-30 “Interest-Imputation of Interest.” These updates require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability while debt issuance costs related to line-of-credit arrangements will continue to be presented as an asset. We adopted ASU 2015-03 and ASU 2015-15 on January 1, 2016 which required retrospective application. As of December 31, 2015 and December 31, 2014, debt issuance costs of $31.4 million and $8.9 million, respectively, were reclassified within our consolidated balance sheet from other assets to long-term debt and $1.5 million and zero, respectively, were reclassified within our consolidated balance sheet from other assets to current installments of long-term debt.

In May 2014, the FASB issued ASU 2014-09 “Revenue from Contracts with Customers,” which amends ASC 605 “Revenue Recognition” and creates a new topic, ASC 606 “Revenue from Contracts with Customers.” This update provides guidance on how an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. Upon initial application, the provisions of this update are required to be applied retrospectively to each prior reporting period presented or retrospectively with the cumulative effect of initially applying this update recognized at the date of initial application. This update also expands the disclosure requirements surrounding revenue recorded from contracts with customers. In August 2015, the FASB issued ASU 2015-14 “Revenue from Contracts with Customers” (ASU 2015-14), which amends ASC 606. This update defers the effective date of ASU 2014-09 for fiscal years, and interim periods within those years, beginning after December 15, 2017. We are currently evaluating the effect of this update on our financial statements and have not yet determined the method of initial application we will use.

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ACQUISITION

3 Months Ended

12 Months Ended

Mar. 31, 2016

Dec. 31, 2015

Acquisition [Abstract]

ACQUISITION

ACQUISITION

On the Closing Date, Olin consummated the previously announced merger (the Merger), using a Reverse Morris Trust structure, of our wholly owned subsidiary, Blue Cube Acquisition Corp. (Merger Sub), with and into Blue Cube Spinco Inc. (Spinco), with Spinco as the surviving corporation and a wholly owned subsidiary of Olin, as contemplated by the Agreement and Plan of Merger (the Merger Agreement) dated March 26, 2015, among Olin, TDCC, Merger Sub and Spinco (collectively, the Acquisition). Pursuant to the Merger Agreement and a Separation Agreement dated March 26, 2015 between TDCC and Spinco (the Separation Agreement), prior to the Merger, (1) TDCC transferred the Acquired Business to Spinco and (2) TDCC distributed Spinco’s stock to TDCC’s shareholders by way of a split-off (the Distribution). Upon consummation of the transactions contemplated by the Merger Agreement and the Separation Agreement (the Transactions), the shares of Spinco common stock then outstanding were automatically converted into the right to receive approximately 87.5 million shares of Olin common stock, which were issued by Olin on the Closing Date, and represented approximately 53% of the outstanding shares of Olin common stock, together with cash in lieu of fractional shares. Olin’s pre-Merger shareholders continued to hold the remaining approximately 47% of the outstanding shares of Olin common stock. On the Closing Date, Spinco became a wholly owned subsidiary of Olin.

The following table summarizes the aggregate purchase price for the Acquired Business and related transactions, after the final post-closing adjustments:

	October 5, 2015
	(In millions, except per share data)
Shares	87.5
Value of common stock on October 2, 2015	17.46
Equity consideration by exchange of shares	$	1,527.4
Cash and debt instruments received by TDCC	2,095.0
Accrual for future payments	69.5
Up-front payments under the ethylene agreements	433.5
Total cash, debt and equity consideration	$	4,125.4
Long-term debt assumed	569.0
Pension liabilities assumed	442.3
Aggregate purchase price	$	5,136.7

The value of the common stock was based on the closing stock price on the last trading day prior to the Closing Date. The aggregate purchase price was adjusted for the final working capital adjustment and the final valuation for the pension liabilities assumed from TDCC.

In connection with the Acquisition, TDCC retained liabilities relating to the Acquired Business for litigation, releases of hazardous materials and violations of environmental law to the extent arising prior to the Closing Date.

For the three months ended March 31, 2016 and 2015, we incurred costs related to the Acquisition of $10.2 million and $10.4 million, respectively, which consisted of advisory, legal, accounting, integration and other professional fees. For the three months ended March 31, 2015, we incurred $0.4 million of financing-related fees.

For segment reporting purposes, the Acquired Business’s Global Epoxy operating results comprise the newly created Epoxy segment and U.S. Chlor Alkali and Vinyl and Global Chlorinated Organics (Acquired Chlor Alkali Business) operating results combined with our former Chlor Alkali Products and Chemical Distribution segments to comprise the newly created Chlor Alkali Products and Vinyls segment. The Acquired Business’s results of operations have been included in our consolidated results for the period subsequent to the Closing Date. Our results for the three months ended March 31, 2016 include Epoxy sales of $460.2 million and segment income of $8.2 million and Chlor Alkali Products and Vinyls include sales of the Acquired Chlor Alkali Business of $395.9 million and segment income of $56.3 million.

The Transactions have been accounted for using the acquisition method of accounting which requires, among other things, that assets acquired and liabilities assumed be recognized at their fair values as of the acquisition date. As of March 31, 2016, we are continuing the process of determining the fair values of the Acquired Business’s tangible and intangible assets and liabilities. The purchase price allocation is preliminary until we complete our assessment. The following recognized amounts are subject to change:

• Amounts for certain balances included in working capital pending receipt of certain information that could affect provisional amounts recorded;

• amounts for intangible assets and property, plant and equipment, pending finalization of valuation efforts as well as the completion of procedures confirming the existence and condition of certain property, plant and equipment assets;

• amounts for income tax liabilities, pending finalization of estimates and assumptions in respect of certain tax aspects of the transaction; and

• amount of goodwill pending the completion of the valuation of the assets acquired and liabilities assumed.

We will finalize the amounts recognized as we obtain the information necessary to complete the analyses. We expect to finalize these amounts as soon as possible but no later than one year from the acquisition date. The following table summarizes the preliminary allocation of the purchase price to the Acquired Business’s assets and liabilities on the Closing Date:

	Initial Valuation		Measurement Period Adjustments			As of March 31, 2016
	($ in millions)
Total current assets	$	921.7	$	(2.9	)	$	918.8
Property, plant and equipment	3,090.8		—			3,090.8
Deferred taxes	76.8		—			76.8
Intangible assets	582.3		—			582.3
Other assets	426.5		6.2			432.7
Total assets acquired	5,098.1		3.3			5,101.4
Total current liabilities	357.6		(6.2		)	351.4
Long-term debt	517.9		—			517.9
Accrued pension liability	447.1		(4.8		)	442.3
Deferred tax liability	1,054.9		—			1,054.9
Other liabilities	2.0		6.2			8.2
Total liabilities assumed	2,379.5		(4.8		)	2,374.7
Net identifiable assets acquired	2,718.6		8.1			2,726.7
Goodwill	1,427.5		(28.8		)	1,398.7
Fair value of net assets acquired	$	4,146.1	$	(20.7	)	$	4,125.4

Measurement period adjustments for the three months ended March 31, 2016 primarily consisted of the final working capital adjustment and the final valuation for the pension liabilities assumed from TDCC. Included in total current assets are cash and cash equivalents of $25.4 million, inventories of $477.1 million and receivables of $416.0 million with a contracted value of $420.6 million. Included in total current liabilities are current installments of long-term debt of $51.1 million.

Based on preliminary valuations, purchase price was allocated to intangible assets as follows:

	October 5, 2015
	Weighted-Average Amortization Period	Gross Amount
		($ in millions)
Customers, customer contracts and relationships	15 Years	$	490.3
Acquired technology	7 Years	85.0
Trade name	Indefinite	7.0
Total acquired intangible assets		$	582.3

Based on preliminary valuations as of March 31, 2016, $1,398.7 million was assigned to goodwill, none of which is deductible for tax purposes. The primary reasons for the Acquisition and the principal factors that contributed to the Acquired Business purchase price that resulted in the recognition of goodwill are due to the providing of increased production capacity and diversification of Olin’s product portfolio, cost-saving opportunities and enhanced size and geographic presence. The cost-saving opportunities include improved operating efficiencies and asset optimization.

Goodwill recorded in the Acquisition is not amortized but will be reviewed for impairment annually in the fourth quarter and/or when circumstances or other events indicate that impairment may have occurred.

Transaction financing

Prior to the Distribution, TDCC received from Spinco distributions of cash and debt instruments of Spinco with an aggregate value of $2,095.0 million (collectively, the Cash and Debt Distribution). On the Closing Date, Spinco 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 10.0% senior notes due October 15, 2025 (2025 Notes and, together with the 2023 Notes, the Notes) to TDCC. TDCC transferred the Notes to certain unaffiliated securityholders in satisfaction of existing debt obligations of TDCC held or acquired by those unaffiliated securityholders. On October 5, 2015, certain initial purchasers purchased the Notes from the unaffiliated securityholders. Interest on the Notes began accruing from October 1, 2015 and will be paid semi-annually beginning on April 15, 2016. The Notes are not redeemable at any time prior to October 15, 2020. Neither Olin nor Spinco received any proceeds from the sale of the Notes. Upon the consummation of the Transactions, Olin became guarantor of the Notes.

On June 23, 2015, Spinco entered into a new five-year delayed-draw term loan facility of up to $1,050.0 million. As of the Closing Date, Spinco drew $875.0 million to finance the cash portion of the Cash and Debt Distribution. Also on June 23, 2015, Olin and Spinco entered into a new five-year $1,850.0 million senior credit facility consisting of a $500.0 million senior revolving credit facility, which replaced Olin’s $265.0 million senior revolving credit facility at the closing of the Merger, and a$1,350.0 million (subject to reduction by the aggregate amount of the term loans funded to Spinco under the Spinco term loan facility) delayed-draw term loan facility. As of the Closing Date, an additional $475.0 million was drawn by Olin under this term loan facility which was used to pay fees and expenses of the Transactions, obtain additional funds for general corporate purposes and refinance Olin’s existing senior term loan facility due in 2019. Subsequent to the Closing Date, these senior credit facilities were consolidated into a single $1,850.0 million senior credit facility, which includes a $1,350.0 million term loan facility. This new senior credit facility will expire in 2020. The $500.0 million senior revolving credit facility includes a $100.0 million letter of credit subfacility. The term loan facility includes amortization payable in equal quarterly installments at a rate of 5.0% per annum for the first two years, increasing to 7.5% per annum for the following year and to 10.0% per annum for the last two years. Under the new senior credit facility, we may select various floating rate borrowing options. The actual interest rate paid on borrowings under the senior credit facility is based on a pricing grid which is dependent upon the leverage ratio as calculated under the terms of the facility for the prior fiscal quarter. The facility includes various customary restrictive covenants, including restrictions related to the ratio of debt to earnings before interest expense, taxes, depreciation and amortization (leverage ratio) and the ratio of earnings before interest expense, taxes, depreciation and amortization to interest expense (coverage ratio). Compliance with these covenants is determined quarterly based on the operating cash flows.

On August 25, 2015, Olin entered into a Credit Agreement (the Credit Agreement) with a syndicate of lenders and Sumitomo Mitsui Banking Corporation, as administrative agent, in connection with the Transactions. The Credit Agreement provides for a term credit facility (the Sumitomo Credit Facility) under which Olin obtained term loans in an aggregate amount of $600.0 million. On November 3, 2015, we entered into an amendment to the Sumitomo Credit Facility which increased the aggregate amount of term loans available by $200.0 million. On the Closing Date, $600.0 million of loans under the Credit Agreement were made available and borrowed upon and on November 5, 2015, $200.0 million of loans under the Credit Agreement were made available and borrowed upon. The term loans under the Sumitomo Credit Facility will mature on October 5, 2018 and will have no scheduled amortization payments. The proceeds of the Sumitomo Credit Facility were used to refinance existing Spinco indebtedness outstanding at the Closing Date, to pay fees and expenses in connection with the Transactions and for general corporate purposes. The Credit Agreement contains customary representations, warranties and affirmative and negative covenants which are substantially similar to those included in the new $1,850.0 million senior credit facility.

On March 26, 2015, we and certain financial institutions executed commitment letters pursuant to which the financial institutions agreed to provide $3,354.5 million of financing to Spinco to finance the amount of the Cash and Debt Distribution and to provide financing, if needed, to Olin to refinance certain of our existing debt (the Bridge Financing), in each case on the terms and conditions set forth in the commitment letters. The Bridge Financing was not drawn on to facilitate the Transactions, and the commitments for the Bridge Financing were terminated as of the Closing Date. For the three months ended March 31, 2015, we paid deferred debt issuance costs of $14.3 million associated with the Bridge Financing.

Other acquisition-related transactions

In connection with the Transactions, certain additional agreements have been entered into, including, among others, an Employee Matters Agreement, a Tax Matters Agreement, site, transitional and other services agreements, supply and purchase agreements, real estate agreements, technology licenses and intellectual property agreements. Payments of approximately $69.5 million will be made related to certain acquisition-related liabilities including the final working capital adjustment.

In addition, Olin and TDCC have agreed to enter into arrangements for the long-term supply of ethylene by TDCC to Olin, pursuant to which, among other things, Olin has made upfront payments of $433.5 million upon the closing of the Merger in order to receive ethylene at producer economics and for certain reservation fees for the option to obtain additional future ethylene supply at producer economics. The fair value of the long-term supply contracts recorded as of the Closing Date was a long-term asset of $410.8 million which will be amortized over the life of the contracts as ethylene is received. If the options are exercised by us, additional payments will be made to TDCC of between $205 million and $215 million in 2017 and between $425 million and $465 million in 2020, which will increase the value of the long-term asset.

In connection with the Transactions and effective October 1, 2015, we filed a Certificate of Amendment to our Articles of Incorporation to increase the number of authorized shares of Olin common stock from 120.0 million shares to 240.0 million shares.

Pro forma financial information

The following pro forma summary reflects consolidated results of operation as if the Acquisition had occurred on January 1, 2014 (unaudited).

	Three Months Ended March 31,
	2015
	(In millions, except per share data)
Sales	$	1,439.0
Net loss	(39.5		)
Net loss per common share:
Basic	$	(0.24	)
Diluted	$	(0.24	)

The pro forma financial information was prepared based on historical financial information and has been adjusted to give effect to pro forma adjustments that are (i) directly attributable to the Transactions, (ii) factually supportable and (iii) expected to have a continuing impact on the combined results. The pro forma statement of income uses estimates and assumptions based on information available at the time. Management believes the estimates and assumptions to be reasonable; however, actual results may differ significantly from this pro forma financial information. The pro forma results presented do not include any anticipated synergies or other expected benefits that may be realized from the Transactions. The pro forma information is not intended to reflect the actual results that would have occurred had the companies actually been combined during the period presented.

The pro forma results for the three months ended March 31, 2015 primarily include recurring adjustments for re-pricing of sales, raw materials and services to/from TDCC relating to arrangements for long-term supply agreements for the sale of raw materials, including ethylene and benzene, and services pursuant to the Separation Agreement, adjustments to eliminate historical sales between the Acquired Business and Olin, additional amortization expense related to the fair value of acquired identifiable intangible assets, additional depreciation expense related to the fair value adjustment to property, plant and equipment, interest expense related to the incremental debt issued in conjunction with the Acquisition and an adjustment to tax-effect the aforementioned pro forma adjustments using an estimated aggregate statutory income tax rate of the jurisdictions to which the above adjustments relate.

In addition to the above recurring adjustments, the pro forma results for the three months ended March 31, 2015 included non-recurring adjustments of $10.4 million relating to the elimination of transaction costs incurred that are directly related to the Transactions, and do not have a continuing impact on our combined operating results.

ACQUISITION

On the Closing Date, Olin consummated the previously announced merger (the Merger), using a Reverse Morris Trust structure, of our wholly owned subsidiary, Blue Cube Acquisition Corp. (Merger Sub), with and into Blue Cube Spinco Inc. (Spinco), with Spinco as the surviving corporation and a wholly owned subsidiary of Olin, as contemplated by the Agreement and Plan of Merger (the Merger Agreement) dated March 26, 2015, among Olin, TDCC, Merger Sub and Spinco (collectively, the Acquisition). Pursuant to the Merger Agreement and a Separation Agreement dated March 26, 2015 between TDCC and Spinco (the Separation Agreement), prior to the Merger, (1) TDCC transferred the Acquired Business to Spinco and (2) TDCC distributed Spinco’s stock to TDCC’s shareholders by way of a split-off (the Distribution). Upon consummation of the transactions contemplated by the Merger Agreement and the Separation Agreement (the Transactions), the shares of Spinco common stock then outstanding were automatically converted into the right to receive approximately 87.5 million shares of Olin common stock, which were issued by Olin on the Closing Date, and represented approximately 53% of the outstanding shares of Olin common stock, together with cash in lieu of fractional shares. Olin’s pre-Merger shareholders continued to hold the remaining approximately 47% of the outstanding shares of Olin common stock. On the Closing Date, Spinco became a wholly owned subsidiary of Olin.

The following table summarizes the aggregate purchase price for the Acquired Business and related transactions, subject to certain post-closing adjustments:

	October 5, 2015
	(In millions, except per share data)
Shares	87.5
Value of common stock on October 2, 2015	17.46
Equity consideration by exchange of shares	$	1,527.4
Cash and debt instruments received by TDCC	2,095.0
Accrual for future payments	90.2
Up-front payments under the ethylene agreements	433.5
Total cash, debt and equity consideration	$	4,146.1
Long-term debt assumed	569.0
Pension liabilities assumed	447.1
Aggregate purchase price	$	5,162.2

The value of the common stock was based on the closing stock price on the last trading day prior to the Closing Date.

In connection with the Acquisition, TDCC retained liabilities relating to the Acquired Business for litigation, releases of hazardous materials and violations of environmental law to the extent arising prior to the Closing Date.

During 2015, we incurred costs in connection with the Merger and related transactions, including $76.3 million of advisory, legal, accounting, integration and other professional fees and $30.5 million of financing-related fees. In addition, $47.1 million of costs were incurred as a result of the change in control which created a mandatory acceleration of expenses under deferred compensation plans as a result of the Transactions.

For segment reporting purposes, the Acquired Business’s Global Epoxy operating results comprise the newly created Epoxy segment and U.S. Chlor Alkali and Vinyl and Global Chlorinated Organics (Acquired Chlor Alkali Business) operating results combined with our former Chlor Alkali Products and Chemical Distribution segments to comprise the newly created Chlor Alkali Products and Vinyls segment. The Acquired Business’s results of operations have been included in our consolidated results for the period subsequent to the Closing Date. Our results for the year ended December 31, 2015 include Epoxy sales of $429.6 million and a segment loss of $7.5 million and Chlor Alkali Products and Vinyls include sales of the Acquired Chlor Alkali Business of $373.0 million and segment income of $37.2 million.

The Transactions have been accounted for using the acquisition method of accounting which requires, among other things, that assets acquired and liabilities assumed be recognized at their fair values as of the acquisition date.  We are in the process of determining the fair values of the Acquired Business’s tangible and intangible assets and liabilities. Initial estimates of those fair values are included in these consolidated financial statements; however, the valuation process is not complete, and we expect that adjustments to the initial valuation will be required. The following table summarizes the preliminary allocation of the purchase price to the Acquired Business’s assets and liabilities:

	October 5, 2015
	($ in millions)
Total current assets	$	921.7
Property, plant and equipment	3,090.8
Deferred taxes	76.8
Intangible assets	582.3
Other assets	426.5
Total assets acquired	5,098.1
Total current liabilities	357.6
Long-term debt	517.9
Accrued pension liability	447.1
Deferred tax liability	1,054.9
Other liabilities	2.0
Total liabilities assumed	2,379.5
Net identifiable assets acquired	2,718.6
Goodwill	1,427.5
Fair value of net assets acquired	$	4,146.1

Included in total current assets are cash and cash equivalents of $25.4 million, inventories of $477.1 million and receivables of $418.9 million with a contracted value of $423.5 million. Included in total current liabilities are current installments of long-term debt of $51.1 million.

Based on preliminary valuations, purchase price was allocated to intangible assets as follows:

	October 5, 2015
	Weighted-Average Amortization Period	Gross Amount
		($ in millions)
Customers, customer contracts and relationships	15 Years	$	490.3
Acquired technology	7 Years	85.0
Trade name	Indefinite	7.0
Total acquired intangible assets		$	582.3

Based on preliminary valuations, $1,427.5 million was assigned to goodwill, none of which is deductible for tax purposes.  The primary reasons for the Acquisition and the principal factors that contributed to the Acquired Business purchase price that resulted in the recognition of goodwill are due to the providing of increased production capacity and diversification of Olin’s product portfolio, cost-saving opportunities and enhanced size and geographic presence. The cost-saving opportunities include improved operating efficiencies and asset optimization.

Goodwill recorded in the Acquisition is not amortized but will be reviewed for impairment annually in the fourth quarter and/or when circumstances or other events indicate that impairment may have occurred.

Transaction financing

Prior to the Distribution, TDCC received from Spinco distributions of cash and debt instruments of Spinco with an aggregate value of $2,095.0 million (collectively, the Cash and Debt Distribution). On the Closing Date, Spinco 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) to TDCC. TDCC transferred the Notes to certain unaffiliated securityholders in satisfaction of existing debt obligations of TDCC held or acquired by those unaffiliated securityholders. On October 5, 2015, certain initial purchasers purchased the Notes from the unaffiliated securityholders. Interest on the Notes began accruing from October 1, 2015 and will be paid semi-annually beginning on April 15, 2016. The Notes are not redeemable at any time prior to October 15, 2020. Neither Olin nor Spinco received any proceeds from the sale of the Notes. Upon the consummation of the Transactions, Olin became guarantor of the Notes.

On June 23, 2015, Spinco entered into a new five-year delayed-draw term loan facility of up to $1,050.0 million. As of the Closing Date, Spinco drew $875.0 million to finance the cash portion of the Cash and Debt Distribution. Also on June 23, 2015, Olin and Spinco entered into a new five-year $1,850.0 million senior credit facility consisting of a $500.0 million senior revolving credit facility, which replaced Olin’s $265.0 million senior revolving credit facility at the closing of the Merger, and a $1,350.0 million (subject to reduction by the aggregate amount of the term loans funded to Spinco under the Spinco term loan facility) delayed-draw term loan facility. As of the Closing Date, an additional $475.0 million was drawn by Olin under this term loan facility which was used to pay fees and expenses of the Transactions, obtain additional funds for general corporate purposes and refinance Olin’s existing senior term loan facility due in 2019. Subsequent to the Closing Date, these senior credit facilities were consolidated into a single $1,850.0 million senior credit facility. This new senior credit facility will expire in 2020. The $500.0 million senior revolving credit facility includes a $100.0 million letter of credit subfacility. The term loan facility includes amortization payable in equal quarterly installments at a rate of 5.0% per annum for the first two years, increasing to 7.5% per annum for the following year and to 10.0% per annum for the last two years. Under the new senior credit facility, we may select various floating rate borrowing options.  The actual interest rate paid on borrowings under the senior credit facility is based on a pricing grid which is dependent upon the leverage ratio as calculated under the terms of the facility for the prior fiscal quarter.  The facility includes various customary restrictive covenants, including restrictions related to the ratio of debt to earnings before interest expense, taxes, depreciation and amortization (leverage ratio) and the ratio of earnings before interest expense, taxes, depreciation and amortization to interest expense (coverage ratio).  Compliance with these covenants is determined quarterly based on the operating cash flows.

On August 25, 2015, Olin entered into a Credit Agreement (the Credit Agreement) with a syndicate of lenders and Sumitomo Mitsui Banking Corporation, as administrative agent, in connection with the Transactions. The Credit Agreement provides for a term credit facility (the Sumitomo Credit Facility) under which Olin obtained term loans in an aggregate amount of $600.0 million. On November 3, 2015, we entered into an amendment to the Sumitomo Credit Facility which increased the aggregate amount of term loans available by $200.0 million. On the Closing Date, $600.0 million of loans under the Credit Agreement were made available and borrowed upon and on November 5, 2015, $200.0 million of loans under the Credit Agreement were made available and borrowed upon. The term loans under the Sumitomo Credit Facility will mature on October 5, 2018 and will have no scheduled amortization payments. The proceeds of the Sumitomo Credit Facility were used to refinance existing Spinco indebtedness outstanding at the Closing Date, to pay fees and expenses in connection with the Transactions and for general corporate purposes. The Credit Agreement contains customary representations, warranties and affirmative and negative covenants which are substantially similar to those included in the new $1,850.0 million senior credit facility.

On March 26, 2015, we and certain financial institutions executed commitment letters pursuant to which the financial institutions agreed to provide $3,354.5 million of financing to Spinco to finance the amount of the Cash and Debt Distribution and to provide financing, if needed, to Olin to refinance certain of our existing debt (the Bridge Financing), in each case on the terms and conditions set forth in the commitment letters. The Bridge Financing was not drawn on to facilitate the Transactions, and the commitments for the Bridge Financing have been terminated as of the Closing Date. For the year ended December 31, 2015, we paid debt issuance costs of $30.0 million associated with the Bridge Financing, which are included in interest expense.

Other acquisition-related transactions

In connection with the Transactions, certain additional agreements have been entered into, including, among others, an Employee Matters Agreement, a Tax Matters Agreement, site, transitional and other services agreements, supply and purchase agreements, real estate agreements, technology licenses and intellectual property agreements. Payments of approximately $90.2 million, subject to certain post-closing adjustments, will be made related to certain acquisition related liabilities including the estimated working capital adjustment.

In addition, Olin and TDCC have agreed to enter into arrangements for the long-term supply of ethylene by TDCC to Olin, pursuant to which, among other things, Olin has made upfront payments of $433.5 million upon the closing of the Merger in order to receive ethylene at producer economics and for certain reservation fees for the option to obtain additional future ethylene supply at producer economics. The fair value of the long-term supply contracts recorded as of the Closing Date was a long-term asset of $410.8 million which will be amortized over the life of the contracts as ethylene is received. If the options are exercised by us, additional payments will be made to TDCC of between $230 million and $250 million on or about the fourth quarter of 2017 and between $425 million and $465 million on or about the fourth quarter of 2020, which will increase the value of the long-term asset.

In connection with the Transactions and effective October 1, 2015, we filed a Certificate of Amendment to our Articles of Incorporation to increase the number of authorized shares of Olin common stock from 120.0 million shares to 240.0 million shares.

Pro forma financial information

The following pro forma summary reflects consolidated results of operation as if the Acquisition had occurred on January 1, 2014 (unaudited).

	Years Ended December 31,
	2015			2014
	($ in millions, except per share data)
Sales	$	5,681.8		$	6,948.2
Net (loss) income	(36.4		)	2.4
Net (loss) income per common share:
Basic	$	(0.22	)	$	0.01
Diluted	$	(0.22	)	$	0.01

The pro forma financial information was prepared based on historical financial information and have been adjusted to give effect to pro forma adjustments that are (i) directly attributable to the Transactions, (ii) factually supportable and (iii) expected to have a continuing impact on the combined results.  The pro forma statements of income use estimates and assumptions based on information available at the time.  Management believes the estimates and assumptions to be reasonable; however, actual results may differ significantly from this pro forma financial information.  The pro forma results presented do not include any anticipated synergies or other expected benefits that may be realized from the Transactions.  The pro forma information is not intended to reflect the actual results that would have occurred had the companies actually been combined during the periods presented.  

The pro forma results for the years ended December 31, 2015 and 2014 primarily include recurring adjustments for re-pricing of sales, raw materials and services to/from TDCC relating to arrangements for long-term supply agreements for the sale of raw materials, including ethylene and benzene, and services pursuant to the Separation Agreement, adjustments to eliminate historical sales between the Acquired Business and Olin, additional amortization expense related to the fair value of acquired identifiable intangible assets, additional depreciation expense related to the fair value adjustment to property, plant and equipment, interest expense related to the incremental debt issued in conjunction with the Acquisition and an adjustment to tax-effect the aforementioned pro forma adjustments using an estimated aggregate statutory income tax rate of the jurisdictions to which the above adjustments relate.

In addition to the above recurring adjustments, the pro forma results for the years ended December 31, 2015 and 2014 included non-recurring adjustments of $47.0 million and $4.2 million, respectively, relating to the elimination of transaction costs incurred that are directly related to the Transactions, and do not have a continuing impact on our combined operating results. The pro forma results for the year ended December 31, 2015 also included non-recurring adjustments of $47.1 million relating to the impact of costs incurred as a result of the change in control which created a mandatory acceleration of expenses under deferred compensation plans and $24.0 million related to additional costs of goods sold related to the increase of inventory to fair value at the acquisition date related to the preliminary purchase accounting for inventory.

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RESTRUCTURING CHARGES

3 Months Ended

12 Months Ended

Mar. 31, 2016

Dec. 31, 2015

Restructuring and Related Activities [Abstract]

RESTRUCTURING CHARGE

RESTRUCTURING CHARGES

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 will reconfigure 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. This 220,000 ton reduction was entirely from diaphragm cell capacity. For the three months ended March 31, 2016, we recorded pretax restructuring charges of $92.2 million for the write-off of equipment and facility costs, lease and other contract termination costs, employee severance and related benefit costs, employee relocation costs and facility exit costs related to these actions. We expect to incur additional restructuring charges through 2020 of approximately $45 million related to these capacity reductions.

On December 12, 2014, we announced that we had made the decision to permanently close the portion of the Becancour, Canada chlor alkali facility that has been shut down since late June 2014. This action reduced the facility’s chlor alkali capacity by 185,000 tons. Subsequent to the shut down, the plant predominantly focuses on bleach and hydrochloric acid, which are value-added products, as well as caustic soda. For the three months ended March 31, 2016 and 2015, we recorded pretax restructuring charges of $0.3 million and $1.2 million, respectively, for the write-off of equipment and facility costs, lease and other contract termination costs, facility exit costs and employee severance and related benefit costs related to these actions. We expect to incur additional restructuring charges through 2017 of approximately $4 million related to the shut down of this portion of the facility.

On November 3, 2010, we announced that we made the decision to relocate the Winchester centerfire pistol and rifle ammunition manufacturing operations from East Alton, IL to Oxford, MS. This relocation, when completed, is forecast to reduce Winchester’s annual operating costs by approximately $35 million to $40 million. Consistent with this decision we initiated an estimated $110 million five-year project, which includes approximately $80 million of capital spending. The capital spending was partially financed by $31 million of grants provided by the State of Mississippi and local governments. We currently expect to complete this relocation in the first half of 2016. For the three months ended March 31, 2016 and 2015, we recorded pretax restructuring charges of $0.3 million and less than $0.1 million, respectively, for employee severance and related benefit costs, employee relocation costs and facility exit costs related to these actions. We expect to incur additional restructuring charges through 2016 of approximately $1 million related to the transfer of these operations.

The following table summarizes the activity by major component of these 2016, 2014 and 2010 restructuring actions and the remaining balances of accrued restructuring costs as of March 31, 2016:

		Employee severance and job related benefits			Lease and other contract termination costs			Employee relocation costs			Facility exit costs			Write-off of equipment and facility			Total
		($ in millions)
Balance at January 1, 2015		$	11.2		$	4.5		$	—		$	—		$	—		$	15.7
	Restructuring charges	—			0.7			0.1			0.2			0.2			1.2
	Amounts utilized	(2.8		)	—			(0.1		)	(0.2		)	(0.2		)	(3.3		)
	Currency translation adjustments	(0.4		)	(0.3		)	—			—			—			(0.7		)
Balance at March 31, 2015		$	8.0		$	4.9		$	—		$	—		$	—		$	12.9
Balance at January 1, 2016		$	4.6		$	2.1		$	—		$	—		$	—		$	6.7
	Restructuring charges	3.9			9.2			0.2			2.9			76.6			92.8
	Amounts utilized	(1.7		)	(0.1		)	(0.2		)	(0.6		)	(76.6		)	(79.2		)
	Currency translation adjustments	0.1			0.1			—			—			—			0.2
Balance at March 31, 2016		$	6.9		$	11.3		$	—		$	2.3		$	—		$	20.5

The following table summarizes the cumulative restructuring charges of these 2016, 2014 and 2010 restructuring actions by major component through March 31, 2016:

	Chlor Alkali Products and Vinyls				Winchester		Total
	Becancour		Capacity Reductions
	($ in millions)
Write-off of equipment and facility	$	3.5	$	76.6	$	—	$	80.1
Employee severance and job related benefits	2.7		3.9		13.1		19.7
Facility exit costs	0.9		2.5		2.3		5.7
Pension and other postretirement benefits curtailment	—		—		4.1		4.1
Employee relocation costs	—		—		5.5		5.5
Lease and other contract termination costs	5.2		9.2		—		14.4
Total cumulative restructuring charges	$	12.3	$	92.2	$	25.0	$	129.5

As of March 31, 2016, we have incurred cash expenditures of $23.8 million and non-cash charges of $84.6 million related to these restructuring actions. The remaining balance of $20.5 million is expected to be paid out through 2020.

RESTRUCTURING CHARGES

On December 12, 2014, we announced that we had made the decision to permanently close the portion of the Becancour, Canada chlor alkali facility that has been shut down since late June 2014. This action reduced the facility’s chlor alkali capacity by 185,000 tons. Subsequent to the shut down, the plant predominantly focuses on bleach and hydrochloric acid, which are value-added products, as well as caustic soda. In the fourth quarter of 2014, we recorded pretax restructuring charges of $10.0 million for the write-off of equipment and facility costs, employee severance and related benefit costs and lease and other contract termination costs related to these actions. For the year ended December 31, 2015, we recorded pretax restructuring charges of $2.0 million for the write-off of equipment and facility costs, lease and other contract termination costs and facility exit costs. We expect to incur additional restructuring charges through 2016 of approximately $4 million related to the shut down of this portion of the facility.

On December 9, 2010, our board of directors approved a plan to eliminate our use of mercury in the manufacture of chlor alkali products.  Under the plan, the 260,000 tons of mercury cell capacity at our Charleston, TN facility was converted to 200,000 tons of membrane capacity capable of producing both potassium hydroxide and caustic soda.  The board of directors also approved plans to reconfigure our Augusta, GA facility to manufacture bleach and distribute caustic soda, while discontinuing chlor alkali manufacturing at this site.  The completion of these projects eliminated our chlor alkali production using mercury cell technology. For the years ended December 31, 2014 and 2013, we recorded pretax restructuring charges of $3.8 million and $3.7 million, respectively, for employee severance and related benefit costs, employee relocation costs, facility exit costs, write-off of equipment and facility costs and lease and other contract termination costs related to these actions.

On November 3, 2010, we announced that we made the decision to relocate the Winchester centerfire pistol and rifle ammunition manufacturing operations from East Alton, IL to Oxford, MS.  This relocation, when completed, is forecast to reduce Winchester’s annual operating costs by approximately $35 million to $40 million.  Consistent with this decision in 2010, we initiated an estimated $110 million five-year project, which includes approximately $80 million of capital spending.  The capital spending was partially financed by $31 million of grants provided by the State of Mississippi and local governments. We currently expect to complete this relocation in the first half of 2016.  For the years ended December 31, 2015, 2014 and 2013, we recorded pretax restructuring charges of $0.7 million, $1.9 million and $1.8 million, respectively, for employee severance and related benefit costs, employee relocation costs and facility exit costs related to these actions.  We expect to incur additional restructuring charges through 2016 of approximately $1 million related to the transfer of these operations.

The following table summarizes the 2015, 2014 and 2013 activities by major component of these 2014 and 2010 restructuring actions and the remaining balances of accrued restructuring costs as of December 31, 2015:

	Employee severance and job related benefits			Lease and other contract termination costs			Employee relocation costs			Facility exit costs			Write-off of equipment and facility			Total
	($ in millions)
Balance January 1, 2013	$	13.5		$	0.4		$	—		$	—		$	—		$	13.9
2013 restructuring charges (credits)	0.4			(0.4		)	0.6			4.9			—			5.5
Amounts utilized	(3.7		)	—			(0.6		)	(4.9		)	—			(9.2		)
Balance at December 31, 2013	10.2			—			—			—			—			10.2
2014 restructuring charges	4.5			4.5			0.5			2.9			3.3			15.7
Amounts utilized	(3.5		)	—			(0.5		)	(2.9		)	(3.3		)	(10.2		)
Balance at December 31, 2014	11.2			4.5			—			—			—			15.7
2015 restructuring charges	—			0.7			0.6			0.9			0.5			2.7
Amounts utilized	(6.0		)	(2.9		)	(0.6		)	(0.9		)	(0.5		)	(10.9		)
Currency translation adjustments	(0.6		)	(0.2		)	—			—			—			(0.8		)
Balance at December 31, 2015	$	4.6		$	2.1		$	—		$	—		$	—		$	6.7

The following table summarizes the cumulative restructuring charges of these 2014 and 2010 restructuring actions by major component through December 31, 2015:

	Chlor Alkali Products and Vinyls				Winchester		Total
	Becancour		Mercury
	($ in millions)
Write-off of equipment and facility	$	3.5	$	17.8	$	—	$	21.3
Employee severance and job related benefits	2.7		5.6		13.1		21.4
Facility exit costs	0.6		15.6		2.2		18.4
Pension and other postretirement benefits curtailment	—		—		4.1		4.1
Employee relocation costs	—		0.9		5.3		6.2
Lease and other contract termination costs	5.2		0.7		—		5.9
Total cumulative restructuring charges	$	12.0	$	40.6	$	24.7	$	77.3

As of December 31, 2015, we have incurred cash expenditures of $37.3 million and non-cash charges of $32.5 million related to these restructuring actions.  The remaining balance of $6.7 million is expected to be paid out through 2016.

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DISCONTINUED OPERATIONS

12 Months Ended

Dec. 31, 2015

Discontinued Operations [Abstract]

Discontinued Operations

DISCONTINUED OPERATIONS

In 2007 we sold our Metals business, which was a reportable segment, and accordingly it was reported as a discontinued operation. Metals produced and distributed copper and copper alloy sheet, strip, foil, rod, welded tube, fabricated parts, and stainless steel and aluminum strip. In conjunction with the sale of the Metals business, we retained certain assets and liabilities.

During 2014, we made a payment of $5.5 million to resolve certain indemnity obligations related to the sale. As a result of the favorable resolution, we recognized a pretax gain of $4.6 million included in income from discontinued operations. The tax provision from discontinued operations included expense of $2.2 million for changes in tax contingencies related to the Metals sale. Income from discontinued operations, net consisted of the following:

	Years Ended December 31,
	2015		2014		2013
	($ in millions)
Income from discontinued operations	$	—	$	4.6	$	—
Tax provision	—		3.9		—
Income from discontinued operations, net	$	—	$	0.7	$	—

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EARNINGS PER SHARE

3 Months Ended

12 Months Ended

Mar. 31, 2016

Dec. 31, 2015

Earnings Per Share [Abstract]

EARNINGS PER SHARE

EARNINGS PER SHARE

Basic and diluted net (loss) income per share are computed by dividing net (loss) income by the weighted average number of common shares outstanding. Diluted net (loss) income per share reflects the dilutive effect of stock-based compensation.

	Three Months Ended March 31,
	2016			2015
Computation of Income (Loss) per Share	(In millions, except per share data)
Net (loss) income	$	(37.9	)	$	13.1
Basic shares	165.1			77.4
Basic net (loss) income per share	$	(0.23	)	$	0.17
Diluted shares:
Basic shares	165.1			77.4
Stock-based compensation	—			1.1
Diluted shares	165.1			78.5
Diluted net (loss) income per share	$	(0.23	)	$	0.17

The computation of dilutive shares from stock-based compensation does not include 7.0 million shares and 1.4 million shares for the three months ended March 31, 2016 and 2015, respectively, as their effect would have been anti-dilutive.

EARNINGS PER SHARE

Basic and diluted (loss) income per share are computed by dividing net (loss) income by the weighted-average number of common shares outstanding.  Diluted net income per share reflects the dilutive effect of stock-based compensation.

	Years ended December 31,
	2015			2014		2013
Computation of Income (loss) per Share	(In millions, except per share data)
Income (loss) from continuing operations, net	$	(1.4	)	$	105.0	$	178.6
Income from discontinued operations, net	—			0.7		—
Net (loss) income	$	(1.4	)	$	105.7	$	178.6
Basic shares	103.4			78.6		79.9
Basic (loss) income per share:
Income (loss) from continuing operations	$	(0.01	)	$	1.33	$	2.24
Income from discontinued operations, net	—			0.01		—
Net (loss) income	$	(0.01	)	$	1.34	$	2.24
Diluted shares:
Basic shares	103.4			78.6		79.9
Stock-based compensation	—			1.1		1.0
Diluted shares	103.4			79.7		80.9
Diluted (loss) income per share:
Income (loss) from continuing operations	$	(0.01	)	$	1.32	$	2.21
Income from discontinued operations, net	—			0.01		—
Net (loss) income	$	(0.01	)	$	1.33	$	2.21

The computation of dilutive shares from stock-based compensation does not include 5.2 million shares in 2015 and 0.6 million shares in both 2014 and 2013 as their effect would have been anti-dilutive.

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ALLOWANCE FOR DOUBTFUL ACCOUNTS RECEIVABLES

3 Months Ended

12 Months Ended

Mar. 31, 2016

Dec. 31, 2015

Accounts Receivable, Net [Abstract]

ALLOWANCE FOR DOUBTFUL ACCOUNTS RECEIVABLES

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,
	2016			2015
	($ in millions)
Balance at beginning of year	$	6.4		$	3.0
Provisions charged	1.4			0.2
Write-offs, net of recoveries	(1.5		)	(0.1		)
Balance at end of period	$	6.3		$	3.1

ALLOWANCE FOR DOUBTFUL ACCOUNTS RECEIVABLES

Allowance for doubtful accounts receivable consisted of the following:

	December 31,
	2015			2014
	($ in millions)
Beginning balance	$	3.0		$	3.4
Provisions charged	5.2			0.2
Write-offs, net of recoveries	(1.8		)	(0.6		)
Ending balance	$	6.4		$	3.0

At December 31, 2015 and 2014, our consolidated balance sheets included other receivables of $71.1 million and $21.2 million, respectively, which were classified as receivables, net.

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INVENTORIES

3 Months Ended

12 Months Ended

Mar. 31, 2016

Dec. 31, 2015

Inventory Disclosure [Abstract]

INVENTORIES

INVENTORIES

Inventories consisted of the following:

	March 31, 2016			December 31, 2015			March 31, 2015
	($ in millions)
Supplies	$	73.7		$	86.5		$	40.2
Raw materials	88.0			91.5			63.6
Work in process	108.1			105.8			37.2
Finished goods	452.2			445.3			141.1
	722.0			729.1			282.1
LIFO reserve	(42.5		)	(43.9		)	(66.0		)
Inventories, net	$	679.5		$	685.2		$	216.1

In conjunction with the Acquisition, we obtained inventories with a fair value of $477.1 million as of October 5, 2015. Inventories are valued at the lower of cost or market. For U.S. inventories, inventory costs are determined principally by the dollar value 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, 2016 reflect certain estimates relating to inventory quantities and costs at December 31, 2016. The replacement cost of our inventories would have been approximately $42.5 million, $43.9 million and $66.0 million higher than reported at March 31, 2016, December 31, 2015 and March 31, 2015, respectively.

INVENTORIES

	December 31,
	2015			2014
	($ in millions)
Supplies	$	86.5		$	39.2
Raw materials	91.5			63.3
Work in process	105.8			31.8
Finished goods	445.3			141.5
	729.1			275.8
LIFO reserves	(43.9		)	(65.7		)
Inventories, net	$	685.2		$	210.1

In conjunction with the Acquisition, we obtained inventories with a fair value of $477.1 million as of October 5, 2015. Inventories valued using the LIFO method comprised 49% and 58% of the total inventories at December 31, 2015 and 2014, respectively.  The replacement cost of our inventories would have been approximately $43.9 million and $65.7 million higher than that reported at December 31, 2015 and 2014, respectively. During 2014 the reduction in LIFO inventory quantities resulted in LIFO inventory liquidation losses of $1.5 million.

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PROPERTY, PLANT AND EQUIPMENT

12 Months Ended

Dec. 31, 2015

Property, Plant and Equipment [Abstract]

PROPERTY, PLANT AND EQUIPMENT

PROPERTY, PLANT AND EQUIPMENT

		December 31,
	Useful Lives	2015			2014
		($ in millions)
Land and improvements to land	10-20 Years	$	280.4		$	157.3
Buildings and building equipment	10-30 Years	380.4			212.1
Machinery and equipment	3-15 Years	4,665.8			1,846.1
Leasehold improvements		2.7			2.6
Construction in progress		123.5			43.6
Property, plant and equipment		5,452.8			2,261.7
Accumulated depreciation		(1,499.4		)	(1,330.7		)
Property, plant and equipment, net		$	3,953.4		$	931.0

In conjunction with the Acquisition, we obtained property, plant and equipment with a fair value of $3,090.8 million as of October 5, 2015.

The weighted-average useful life of machinery and equipment at December 31, 2015 was 12 years. Depreciation expense was $198.1 million, $124.5 million and $120.7 million for 2015, 2014 and 2013, respectively.  Interest capitalized was $1.1 million, $0.2 million and $1.1 million for 2015, 2014 and 2013, respectively.  Maintenance and repairs charged to operations amounted to $158.5 million, $125.0 million and $134.7 million in 2015, 2014 and 2013, respectively.

The consolidated statements of cash flows for the years ended December 31, 2015, 2014 and 2013, included a $(7.4) million, $(0.5) million and $7.9 million, respectively, (decrease) increase to capital expenditures, with the corresponding change to accounts payable and accrued liabilities, related to purchases of property, plant and equipment included in accounts payable at December 31, 2015, 2014 and 2013.

During 2013 we entered into sale/leaseback transactions for bleach trailers and chlorine, caustic soda and bleach railcars. We received proceeds from the sales of $35.8 million for the year ended December 31, 2013.

During 2015 assets of $1.4 million were acquired under capital leases and are included in machinery and equipment as of December 31, 2015.

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INVESTMENTS-AFFILIATED COMPANIES

12 Months Ended

Dec. 31, 2015

Equity Method Investments and Joint Ventures [Abstract]

INVESTMENTS-AFFILIATED COMPANIES

INVESTMENTS—AFFILIATED COMPANIES

On November 16, 2007, we purchased for cash an $11.6 million equity interest in a bleach joint venture.  As part of the investment we also entered into several commercial agreements, including agreements by which we would supply raw materials and services, and we would have marketing responsibility for bleach and caustic soda. During 2013, we sold our equity interest in the bleach joint venture which resulted in a gain of$6.5 million.As a result of the sale, as of December 31, 2015, we have recorded a receivable of $8.5 million which is included within other current assets on our consolidated balance sheet. During 2015, we received $8.8 million as a result of the sale.

We hold a 9.1% limited partnership interest in Bay Gas Storage Company, Ltd. (Bay Gas), an Alabama limited partnership, in which EnergySouth, Inc. (EnergySouth) is the general partner with interest of 90.9%.  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 to EnergySouth customers.

The following table summarizes our investment in our non-consolidated equity affiliate:

	December 31,
	2015		2014
	($ in millions)
Bay Gas	$	25.0	$	23.3

The following table summarizes our equity earnings of non-consolidated affiliates:

	Years Ended December 31,
	2015		2014		2013
	($ in millions)
Bay Gas	$	1.7	$	1.7	$	2.1
Bleach joint venture	—		—		0.7
Equity earnings of non-consolidated affiliates	$	1.7	$	1.7	$	2.8

We received net distributions from our non-consolidated affiliates of zero, zero and $1.5 million for 2015, 2014 and 2013, respectively.

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OTHER ASSETS

3 Months Ended

Mar. 31, 2016

Other Assets [Abstract]

Other Assets Disclosure

OTHER ASSETS

Included in other assets were the following:

	March 31, 2016		December 31, 2015		March 31, 2015
	($ in millions)
Investments in non-consolidated affiliates	$	25.2	$	25.0	$	23.7
Deferred debt issuance costs	3.1		3.3		15.1
Bleach joint venture receivable	—		—		5.8
Tax-related receivables	14.4		1.5		6.6
Interest rate swaps	—		—		2.9
Supply contracts	402.2		406.5		—
Other	18.9		18.3		16.1
Other assets	$	463.8	$	454.6	$	70.2

In connection with the Acquisition, Olin and TDCC have agreed to enter into arrangements for the long-term supply of ethylene by TDCC to Olin, pursuant to which, among other things, Olin has made upfront payments of $433.5 million upon the Closing Date in order to receive ethylene at producer economics and for certain reservation fees for the option to obtain additional future ethylene supply at producer economics. The fair value of the long-term supply contracts recorded as of the Closing Date was a long-term asset of $410.8 million which will be amortized over the life of the contracts as ethylene is received. If the options are exercised by us, additional payments will be made to TDCC of between $205 million and $215 million in 2017 and between $425 million and $465 million in 2020, which will increase the value of the long-term asset. Amortization expense of $4.3 million was recognized within cost of goods sold for the three months ended March 31, 2016 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.

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GOODWILL AND INTANGIBLES GOODWILL AND INTANGIBLES

3 Months Ended

12 Months Ended

Mar. 31, 2016

Dec. 31, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND INTANGIBLES

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, 2015	$	747.1		$	—		$	747.1
Acquisition activity	—			—			—
Balance at March 31, 2015	$	747.1		$	—		$	747.1
Balance at January 1, 2016	$	1,877.5		$	296.6		$	2,174.1
Acquisition activity	(23.3		)	(5.5		)	(28.8		)
Foreign currency translation adjustment	0.6			0.2			0.8
Balance at March 31, 2016	$	1,854.8		$	291.3		$	2,146.1

Intangible assets consisted of the following:

	March 31, 2016								December 31, 2015								March 31, 2015
	Gross Amount		Accumulated Amortization				Net		Gross Amount		Accumulated Amortization				Net		Gross Amount		Accumulated Amortization				Net
	($ in millions)
Customers, customer contracts and relationships	$	643.8		$	(75.9	)	$	567.9	$	641.0		$	(64.0	)	$	577.0	$	152.9		$	(44.7	)	$	108.2
Trade name	17.9			(2.7		)	15.2		17.9			—			17.9		10.9			—			10.9
Acquired technology	85.2			(5.7		)	79.5		84.7			(2.7		)	82.0		—			—			—
Other	2.3			(1.7		)	0.6		2.3			(1.7		)	0.6		2.3			(1.6		)	0.7
Total intangible assets	$	749.2		$	(86.0	)	$	663.2	$	745.9		$	(68.4	)	$	677.5	$	166.1		$	(46.3	)	$	119.8

In conjunction with the Acquisition, we obtained intangible assets with a fair value of $582.3 million as of October 5, 2015.

Intangible assets with indefinite useful lives are reviewed annually in the fourth quarter and/or when circumstances or other events indicate the indefinite life is no longer supportable. In connection with the integration of the Acquired Business, in the first quarter of 2016, the KA Steel trade name was changed from an indefinite life intangible asset to an intangible asset with a finite useful life of one year. Amortization expense of $2.7 million was recognized within cost of goods sold for the three months ended March 31, 2016 related to the change in useful life.

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, 2014	$	747.1		$	—		$	747.1
Acquisition activity	—			—			—
Balance at December 31, 2014	747.1			—			747.1
Acquisition activity	1,130.8			296.7			1,427.5
Foreign currency translation adjustment	(0.4		)	(0.1		)	(0.5		)
Balance at December 31, 2015	$	1,877.5		$	296.6		$	2,174.1

The increase in goodwill during 2015 was a result of the Acquisition and is based upon the preliminary valuation partially offset by the effects of foreign currency translation adjustments.

Intangible assets consisted of the following:

		December 31,
		2015							2014
	Useful Lives	Gross Amount		Accumulated Amortization			Net		Gross Amount		Accumulated Amortization			Net
		($ in millions)
Customers, customer contracts and relationships	(10-15 years)	$	641.0	$	(64.0	)	$	577.0	$	152.9	$	(41.0	)	$	111.9
Trade name	(indefinite)	17.9		—			17.9		10.9		—			10.9
Acquired technology	(7 years)	84.7		(2.7		)	82.0		—		—			—
Other	(4-10 years)	2.3		(1.7		)	0.6		2.3		(1.6		)	0.7
Total intangible assets		$	745.9	$	(68.4	)	$	677.5	$	166.1	$	(42.6	)	$	123.5

In conjunction with the Acquisition, we obtained intangible assets with a fair value of $582.3 million as of October 5, 2015.

Amortization expense relating to intangible assets was $25.8 million in 2015 and $14.6 million in both 2014 and 2013.  We estimate that amortization expense will be approximately $59.3 million in 2016 and approximately $59.2 million in 2017, 2018, 2019 and 2020.  Intangible assets are reviewed for impairment annually in the fourth quarter and/or when circumstances or other events indicate that impairment may have occurred.

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DEBT

12 Months Ended

Dec. 31, 2015

Debt Instruments [Abstract]

DEBT

DEBT

Long-Term Debt

	December 31,
	2015			2014
Notes payable:	($ in millions)
Variable-rate Senior Term Loan facility, due 2020 (2.17% at December 31, 2015)	$	1,350.0		$	—
Variable-rate Sumitomo credit facility, due 2018 (1.77% at December 31, 2015)	800.0			—
Variable-rate Recovery Zone bonds, due 2024-2035 (1.40% and 1.31% at December 31, 2015 and 2014, respectively)	103.0			103.0
Variable-rate Go Zone bonds, due 2024 (1.40% and 1.31% at December 31, 2015 and 2014, respectively)	50.0			50.0
Variable-rate Industrial development and environmental improvement obligations, due 2025 (0.27% and 0.20% at December 31, 2015 and 2014, respectively)	2.9			2.9
Variable-rate Senior Term Loan facility, due 2019 (1.66% at December 31, 2014)	—			149.1
9.75%, due 2023	720.0			—
10.00%, due 2025	500.0			—
5.50%, due 2022	200.0			200.0
6.75%, due 2016 (includes interest rate swaps of $1.2 million and $3.7 million in 2015 and 2014, respectively)	126.2			128.7
7.23%, SunBelt Notes due 2013-2017 (includes unamortized fair value premium of $0.2 million and $0.5 million and interest rate swaps of $0.4 million and $0.8 million in 2015 and 2014, respectively)	25.0			37.8
Capital lease obligations	4.6			3.6
Deferred debt issuance costs	(32.9		)	(8.9		)
Total debt	3,848.8			666.2
Amounts due within one year	205.0			16.4
Total long-term debt	$	3,643.8		$	649.8

On the Closing Date, Spinco issued $720.0 million aggregate principal 2023 Notes and $500.0 million aggregate principal 2025 Notes to TDCC. TDCC transferred the Notes to certain unaffiliated securityholders in satisfaction of existing debt obligations of TDCC held or acquired by those unaffiliated securityholders. On October 5, 2015, certain initial purchasers purchased the Notes from the unaffiliated securityholders. Interest on the Notes began accruing from October 1, 2015 and will be paid semi-annually beginning on April 15, 2016. The Notes are not redeemable at any time prior to October 15, 2020. Neither Olin nor Spinco received any proceeds from the sale of the Notes. Upon the consummation of the Transactions, Olin became guarantor of the Notes.

On June 23, 2015, Spinco entered into a new five-year delayed-draw term loan facility of up to $1,050.0 million. As of the Closing Date, Spinco drew $875.0 million to finance the cash portion of the Cash and Debt Distribution. Also on June 23, 2015, Olin and Spinco entered into a new five-year $1,850.0 million senior credit facility consisting of a $500.0 million senior revolving credit facility, which replaced Olin’s $265.0 million senior revolving credit facility at the closing of the Merger, and a $1,350.0 million (subject to reduction by the aggregate amount of the term loans funded to Spinco under the Spinco term loan facility) delayed-draw term loan facility. As of the Closing Date, an additional $475.0 million was drawn by Olin under this term loan facility which was used to pay fees and expenses of the Transactions, obtain additional funds for general corporate purposes and refinance Olin’s existing senior term loan facility due in 2019. Subsequent to the Closing Date, these senior credit facilities were consolidated into a single senior credit facility. This new senior credit facility will expire in 2020. The $500.0 million senior revolving credit facility includes a $100.0 million letter of credit subfacility. At December 31, 2015, we had $489.6 million available under our $500.0 million senior revolving credit facility because we had issued $10.4 million of letters of credit under the $100.0 million subfacility. The term loan facility includes amortization payable in equal quarterly installments at a rate of 5.0% per annum for the first two years, increasing to 7.5% per annum for the following year and to 10.0% per annum for the last two years. Under the new senior credit facility, we may select various floating rate borrowing options.  The actual interest rate paid on borrowings under the senior credit facility is based on a pricing grid which is dependent upon the leverage ratio as calculated under the terms of the applicable facility for the prior fiscal quarter.  The facility includes various customary restrictive covenants, including restrictions related to the ratio of debt to earnings before interest expense, taxes, depreciation and amortization (leverage ratio) and the ratio of earnings before interest expense, taxes, depreciation and amortization to interest expense (coverage ratio).  Compliance with these covenants is determined quarterly based on the operating cash flows. We were in compliance with all covenants and restrictions under all our outstanding credit agreements as of December 31, 2015 and 2014, and no event of default had occurred that would permit the lenders under our outstanding credit agreements to accelerate the debt if not cured. In the future, our ability to generate sufficient operating cash flows, among other factors, will determine the amounts available to be borrowed under these facilities. As of December 31, 2015, there were no covenants or other restrictions that limited our ability to borrow.

On August 25, 2015, Olin entered into a Credit Agreement with a syndicate of lenders and Sumitomo Mitsui Banking Corporation, as administrative agent, in connection with the Transactions. Olin obtained term loans in an aggregate amount of $600.0 million under the Sumitomo Credit Facility. On November 3, 2015, we entered into an amendment to the Sumitomo Credit Facility which increased the aggregate amount of term loans available by $200.0 million. On the Closing Date, $600.0 million of loans under the Credit Agreement were made available and borrowed upon and on November 5, 2015, $200.0 million of loans under the Credit Agreement were made available and borrowed upon. The term loans under the Sumitomo Credit Facility will mature on October 5, 2018 and will have no scheduled amortization payments. The proceeds of the Sumitomo Credit Facility were used to refinance existing Spinco indebtedness outstanding at the Closing Date of $569.0 million, to pay fees and expenses in connection with the Transactions and for general corporate purposes. The Credit Agreement contains customary representations, warranties and affirmative and negative covenants which are substantially similar to those included in the new $1,850.0 million senior credit facility.

In 2015, we paid debt issuance costs of $13.3 million relating to the Notes, the Sumitomo Credit Facility and the new $1,850.0 million senior credit facility.

On March 26, 2015, we and certain financial institutions executed commitment letters pursuant to which the financial institutions agreed to provide $3,354.5 million of Bridge Financing, in each case on the terms and conditions set forth in the commitment letters. The Bridge Financing was not drawn on to facilitate the Acquisition and the commitments for the Bridge Financing have been terminated as of the Closing Date. For the year ended December 31, 2015, we paid debt issuance costs of $30.0 million associated with the Bridge Financing, which are included in interest expense.

In August 2014, we redeemed our $150.0 million 2019 Notes, which would have matured on August 15, 2019. We recognized interest expense of $9.5 million for the call premium ($6.7 million) and the write-off of unamortized deferred debt issuance costs ($2.1 million) and unamortized discount ($0.7 million) related to this action during 2014. On June 24, 2014, we entered into a five-year $415.0 million senior credit facility consisting of a $265.0 million senior revolving credit facility, which replaced our previous $265.0 million senior revolving credit facility, and a $150.0 million delayed-draw term loan facility. In August 2014, we drew the entire $150.0 million of the term loan and used the proceeds to redeem our 2019 Notes. In 2015 and 2014, we repaid $2.8 million and $0.9 million, respectively, under the required quarterly installments of the $150.0 million term loan facility and, on the Closing Date of the Acquisition, the remaining $146.3 million was refinanced using the proceeds of the new senior credit facility. We recognized interest expense of $0.5 million for the write-off of unamortized deferred debt issuance costs related to this action.

Pursuant to a note purchase agreement dated December 22, 1997, SunBelt sold $97.5 million of Guaranteed Senior Secured Notes due 2017, Series O, and $97.5 million of Guaranteed Senior Secured Notes due 2017, Series G.  We refer to these notes as the SunBelt Notes. The SunBelt Notes bear interest at a rate of 7.23% per annum, payable semi-annually in arrears on each June 22 and December 22.  Beginning on December 22, 2002 and each year through 2017, SunBelt is required to repay $12.2 million of the SunBelt Notes, of which $6.1 million is attributable to the Series O Notes and of which $6.1 million is attributable to the Series G Notes.  In December 2015, 2014 and 2013, $12.2 million was repaid on these SunBelt Notes.

We have guaranteed the Series O Notes, and PolyOne, our former SunBelt partner, has guaranteed the Series G Notes, in both cases pursuant to customary guaranty agreements.  We have agreed to indemnify PolyOne for any payments or other costs under the guarantee in favor of the purchasers of the Series G Notes, to the extent any payments or other costs arise from a default or other breach under the SunBelt Notes.  If SunBelt does not make timely payments on the SunBelt Notes, whether as a result of a failure to pay on a guarantee or otherwise, the holders of the SunBelt Notes may proceed against the assets of SunBelt for repayment.

In January 2013, we repaid the $11.4 million 6.5% Senior Notes, which became due.

During 2015, assets of $1.4 million were acquired under capital leases with terms between 6 years and 7 years. During 2013, assets of $4.2 million were acquired under capital leases with terms of 7 years.

At December 31, 2015, we had total letters of credit of $27.6 million outstanding, of which $10.4 million were issued under our $500.0 million senior revolving credit facility.  The letters of credit are used to support certain long-term debt, certain workers compensation insurance policies, certain plant closure and post-closure obligations and certain Canadian pension funding requirements.

Annual maturities of long-term debt, including capital lease obligations, are $206.5 million in 2016, $80.9 million in 2017, $901.9 million in 2018, $135.7 million in 2019, $980.3 million in 2020 and a total of $1,576.4 million thereafter.

We have entered into interest rate swaps, as disclosed below, whereby we agree to pay variable and fixed rates to a counterparty who, in turn, pays us fixed and variable rates.  In all cases the underlying index for variable rates is the six-month LIBOR.  Accordingly, payments are settled every six months and the terms of the swaps are the same as the underlying debt instruments.

The following table reflects the swap activity related to certain debt obligations:

Underlying Debt Instrument	Swap Amount		Date of Swap	December 31, 2015
	($ in millions)			Olin Pays Floating Rate:
6.75%, due 2016	$	65.0	March 2010	3.75 - 4.75%	(a)
6.75%, due 2016	$	60.0	March 2010	3.75 - 4.75%	(a)
				Olin Receives Floating Rate:
6.75%, due 2016	$	65.0	October 2011	3.75 - 4.75%	(a)
6.75%, due 2016	$	60.0	October 2011	3.75 - 4.75%	(a)

(a) Actual rate is set in arrears.  We project the rate will fall within the range shown.

In March 2010, we entered into interest rate swaps on $125 million of our underlying fixed-rate debt obligations, whereby we agreed to pay variable rates to a counterparty who, in turn, pays us fixed rates.  The counterparty to these agreements is Citibank, N.A. (Citibank).  In October 2011, we entered into $125 million of interest rate swaps with equal and opposite terms as the $125 million variable interest rate swaps on the 2016 Notes.  We have agreed to pay a fixed rate to a counterparty who, in turn, pays us variable rates.  The counterparty to this agreement is also Citibank.  The result was a gain of $11.0 million on the $125 million variable interest rate swaps, which will be recognized through 2016.  As of December 31, 2015, $1.2 million of this gain was included in current installments of long-term debt.  In October 2011, we de-designated our $125 million interest rate swaps that had previously been designated as fair value hedges.  The $125 million variable interest rate swaps and the $125 million fixed interest rate swaps do not meet the criteria for hedge accounting.  All changes in the fair value of these interest rate swaps are recorded currently in earnings.

In June 2012, we terminated $73.1 million of interest rate swaps with Wells Fargo, N.A. (Wells Fargo) that had been entered into on the SunBelt Notes in May 2011. The result was a gain of $2.2 million which will be recognized through 2017. As of December 31, 2015, $0.4 million of this gain was included in long-term debt.

Our loss in the event of nonperformance by these counterparties could be significant to our financial position and results of operations.  These interest rate swaps reduced interest expense by $2.8 million in 2015 and $2.9 million in both 2014 and 2013.  The difference between interest paid and interest received is included as an adjustment to interest expense.

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PENSION PLANS

3 Months Ended

12 Months Ended

Mar. 31, 2016

Dec. 31, 2015

Compensation and Retirement Disclosure [Abstract]

PENSION PLANS

PENSION PLANS AND RETIREMENT BENEFITS

Most of our employees participate in defined contribution pension plans. We provide a contribution to an individual retirement contribution account maintained with the Contributing Employee Ownership Plan (CEOP) primarily equal to an amount of between 5% and 10% of the employee’s eligible compensation. The defined contribution pension plans expense was $6.6 million and $4.3 million for the three months ended March 31, 2016 and 2015, respectively.

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 statutory practices. Our 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 health care (medical) and life insurance benefits for eligible active and retired domestic employees. The health care plans are contributory with participants’ contributions adjusted annually based on medical rates of inflation and plan experience.

Effective as of the Closing Date, we changed the approach used to measure service and interest costs for our defined benefit pension plans and on December 31, 2015 changed this approach for our other postretirement benefits. Prior to the change, we measured service and interest costs utilizing a single weighted-average discount rate derived from the yield curve used to measure the plan obligations. Subsequent to the change, we elected to measure service and interest costs by applying the specific spot rates along the yield curve to the plans’ estimated cash flows. We believe the new approach provides a more precise measurement of service and interest costs by aligning the timing of the plans’ liability cash flows to the corresponding spot rates on the yield curve. This change does not affect the measurement of our plan obligations. We have accounted for this change as a change in accounting estimate and, accordingly, have accounted for it on a prospective basis.

As of the Closing Date and as part of the Acquisition, our U.S. qualified defined benefit pension plan assumed certain U.S. qualified defined benefit pension obligations and assets related to active employees and certain terminated, vested retirees of the Acquired Business with a net liability of $281.7 million. In connection therewith, pension assets will be transferred from TDCC’s U.S. qualified defined benefit pension plans to our U.S. qualified defined benefit pension plan. Immediately prior to the Acquisition, the Acquired Business’s participant accounts assumed in the Acquisition were closed to new participants and were no longer accruing additional benefits.

Also as of the Closing Date, we assumed certain accrued defined benefit pension liabilities relating to employees of TDCC in Germany, Switzerland and other international locations who transferred to Olin in connection with the Acquisition. The net liability assumed as of the Closing Date was $160.6 million.

	Pension Benefits						Other Postretirement Benefits
	Three Months Ended March 31,						Three Months Ended March 31,
	2016			2015			2016		2015
Components of Net Periodic Benefit (Income) Cost	($ in millions)
Service cost	$	3.2		$	1.6		$	0.3	$	0.3
Interest cost	22.4			20.6			0.5		0.6
Expected return on plans’ assets	(39.8		)	(35.6		)	—		—
Recognized actuarial loss	5.3			7.5			0.8		0.9
Curtailments/settlements	—			0.1			—		0.1
Net periodic benefit (income) cost	$	(8.9	)	$	(5.8	)	$	1.6	$	1.9

For the three months ended March 31, 2015, we recorded a curtailment charge of $0.2 million associated with permanently closing a portion of the Becancour, Canada chlor alkali facility that has been shut down since late June 2014. This charge was included in restructuring charges for the three months ended March 31, 2015.

We made cash contributions to our international qualified defined benefit pension plans of $0.5 million and $0.2 million for the three months ended March 31, 2016 and 2015, respectively.

PENSION PLANS

Most of our domestic employees participate in defined contribution pension plans.  We provide a contribution to an individual retirement contribution account maintained with the Contributing Employee Ownership Plan (CEOP) equal to an amount of between 5% and 10% of the employee’s eligible compensation.  The defined contribution pension plans expense was $18.1 million, $16.1 million and $15.4 million for 2015, 2014 and 2013, respectively.

A portion of our bargaining hourly employees continue to participate in our domestic defined benefit pension plans under a flat-benefit formula.  Our funding policy for the 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 statutory practices.  Our 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).

Effective as of the Closing Date, we changed the approach used to measure service and interest costs for our defined benefit pension plans. Prior to the Closing Date, we measured service and interest costs utilizing a single weighted-average discount rate derived from the yield curve used to measure the plan obligations. Subsequent to the Closing Date, we elected to measure service and interest costs by applying the specific spot rates along the yield curve to the plans’ estimated cash flows. We believe the new approach provides a more precise measurement of service and interest costs by aligning the timing of the plans’ liability cash flows to the corresponding spot rates on the yield curve. This change does not affect the measurement of our plan obligations. We have accounted for this change as a change in accounting estimate and, accordingly, have accounted for it on a prospective basis.

During the fourth quarter of 2014, the Society of Actuaries (SOA) issued the final report of its mortality tables and mortality improvement scales. The updated mortality data reflected increasing life expectancies in the U.S. During the third quarter of 2012, the “Moving Ahead for Progress in the 21st Century Act” (MAP-21) became law. The law changed the mechanism for determining interest rates to be used for calculating minimum defined benefit pension plan funding requirements. Interest rates are determined using an average of rates for a 25-year period, which can have the effect of increasing the annual discount rate, reducing the defined benefit pension plan obligation, and potentially reducing or eliminating the minimum annual funding requirement. The law also increased premiums paid to the PBGC. During the third quarter of 2014, the “Highway and Transportation Funding Act” (HATFA 2014) became law, which includes an extension of MAP-21’s defined benefit plan funding stabilization relief. Based on our plan assumptions and estimates, we will not be required to make any cash contributions to the domestic qualified defined benefit pension plan at least through 2016.

As of the Closing Date and as part of the Acquisition, our U.S. qualified defined benefit pension plan assumed certain U.S. qualified defined benefit pension obligations and assets related to active employees and certain terminated, vested retirees of the Acquired Business with an estimated net liability of $286.5 million, subject to certain post-closing adjustments. In connection therewith, pension assets will be transferred from TDCC’s U.S. qualified defined benefit pension plans to our U.S. qualified defined benefit pension plan. Immediately prior to the Acquisition, the Acquired Business’s participant accounts assumed in the Acquisition were closed to new participants and were no longer accruing additional benefits.

Also as of the Closing Date, we assumed certain accrued defined benefit pension liabilities relating to employees of TDCC in Germany, Switzerland and other international locations who transferred to Olin in connection with the Acquisition. The estimated net liability assumed as of the Closing Date was $160.6 million, subject to post-closing adjustments.

Pension Obligations and Funded Status

Changes in the benefit obligation and plan assets were as follows:

	December 31, 2015									December 31, 2014
	($ in millions)									($ in millions)
Change in Benefit Obligation	U.S.			Foreign			Total			U.S.			Foreign			Total
Benefit obligation at beginning of year	$	2,116.5		$	66.3		$	2,182.8		$	1,916.5		$	62.2		$	1,978.7
Service cost	2.1			2.2			4.3			2.3			0.5			2.8
Interest cost	80.2			3.1			83.3			83.8			2.7			86.5
Actuarial (gain) loss	(45.8		)	1.8			(44.0		)	245.8			9.8			255.6
Benefits paid	(205.6		)	(2.8		)	(208.4		)	(131.9		)	(3.6		)	(135.5		)
Curtailments/settlements	12.6			0.1			12.7			—			0.2			0.2
Business combination	498.5			171.4			669.9			—			—			—
Currency translation adjustments	—			(14.7		)	(14.7		)	—			(5.5		)	(5.5		)
Benefit obligation at end of year	$	2,458.5		$	227.4		$	2,685.9		$	2,116.5		$	66.3		$	2,182.8

	December 31, 2015									December 31, 2014
	($ in millions)									($ in millions)
Change in Plan Assets	U.S.			Foreign			Total			U.S.			Foreign			Total
Fair value of plans’ assets at beginning of year	$	1,915.4		$	63.3		$	1,978.7		$	1,798.6		$	62.1		$	1,860.7
Actual return on plans’ assets	(25.4		)	0.4			(25.0		)	244.2			9.4			253.6
Employer contributions	77.6			1.0			78.6			4.5			0.9			5.4
Benefits paid	(205.6		)	(2.8		)	(208.4		)	(131.9		)	(3.6		)	(135.5		)
Business combination	212.0			10.8			222.8			—			—			—
Currency translation adjustments	—			(10.2		)	(10.2		)	—			(5.5		)	(5.5		)
Fair value of plans’ assets at end of year	$	1,974.0		$	62.5		$	2,036.5		$	1,915.4		$	63.3		$	1,978.7

	December 31, 2015									December 31, 2014
	($ in millions)									($ in millions)
Funded Status	U.S.			Foreign			Total			U.S.			Foreign			Total
Qualified plans	$	(480.8	)	$	(163.5	)	$	(644.3	)	$	(137.5	)	$	(1.2	)	$	(138.7	)
Non-qualified plans	(3.7		)	(1.4		)	(5.1		)	(63.6		)	(1.8		)	(65.4		)
Total funded status	$	(484.5	)	$	(164.9	)	$	(649.4	)	$	(201.1	)	$	(3.0	)	$	(204.1	)

Under ASC 715 we recorded a $78.8 million after-tax charge ($125.4 million pretax) to shareholders’ equity as of December 31, 2015 for our pension plans.  This charge reflected unfavorable performance on plan assets during 2015, partially offset by a 50-basis point increase in the domestic pension plans’ discount rate.  In 2014, we recorded an $84.8 million after-tax charge ($138.9 million pretax) to shareholders’ equity as of December 31, 2014 for our pension plans.  This charge reflected a 60-basis point decrease in the plans’ discount rate and the negative impact of the newly mandated mortality tables, partially offset by favorable performance on plan assets during rate.

The $44.0 million actuarial gain for 2015 was primarily due to a 50-basis point increase in the domestic pension plans’ discount rate. The $12.7 million curtailments/settlements for 2015 was primarily due to the change in control which created a mandatory acceleration of payments under the domestic non-qualified pension plan as a result of the Acquisition. The $255.6 million actuarial loss for 2014 was primarily due to a 60-basis point decrease in the plans’ discount rate and the negative impact of the newly mandated mortality tables. Our benefit obligation as of December 31, 2014 increased approximately $90.0 as a result of the newly mandated mortality tables.

Amounts recognized in the consolidated balance sheets consisted of:

	December 31, 2015									December 31, 2014
	($ in millions)									($ in millions)
	U.S.			Foreign			Total			U.S.			Foreign			Total
Accrued benefit in current liabilities	$	(0.4	)	$	(0.1	)	$	(0.5	)	$	(21.8	)	$	(0.3	)	$	(22.1	)
Accrued benefit in noncurrent liabilities	(484.1		)	(164.8		)	(648.9		)	(179.3		)	(2.7		)	(182.0		)
Accumulated other comprehensive loss	714.2			26.6			740.8			654.8			23.0			677.8
Net balance sheet impact	$	229.7		$	(138.3	)	$	91.4		$	453.7		$	20.0		$	473.7

At December 31, 2015 and 2014, the benefit obligation of non-qualified pension plans was $5.1 million and $65.4 million, respectively, and was included in the above pension benefit obligation.  There were no plan assets for these non-qualified pension plans.  Benefit payments for the non-qualified pension plans are expected to be as follows:  2016—$0.5 million; 2017—$0.5 million; 2018—$0.4 million; 2019—$0.5 million; and 2020—$0.6 million.  Benefit payments for the qualified plans are projected to be as follows:  2016—$135.9 million; 2017—$135.7 million; 2018—$136.5 million; 2019—$136.6 million; and 2020—$136.7 million.

	December 31,
	2015		2014
	($ in millions)
Projected benefit obligation	$	2,685.9	$	2,182.8
Accumulated benefit obligation	2,655.0		2,170.8
Fair value of plan assets	2,036.5		1,978.7

	Years Ended December 31,
	2015			2014			2013
Components of Net Periodic Benefit Costs (Income)	($ in millions)
Service cost	$	7.8		$	5.3		$	6.2
Interest cost	83.3			86.5			81.1
Expected return on plans’ assets	(147.4		)	(139.5		)	(137.5		)
Amortization of prior service cost	1.6			2.2			1.9
Recognized actuarial loss	26.2			20.3			27.8
Curtailments/settlements	47.2			0.2			—
Net periodic benefit costs (income)	$	18.7		$	(25.0	)	$	(20.5	)
Included in Other Comprehensive Loss (Pretax)
Liability adjustment	$	125.4		$	138.9		$	14.4
Amortization of prior service costs and actuarial losses	(62.4		)	(22.7		)	(29.7		)

The $47.2 million curtailments/settlements for 2015 were due to a settlement of $47.1 million of costs incurred as a result of the change in control which created a mandatory acceleration of payments under the domestic non-qualified pension plan as a result of the Acquisition. Also, for the years ended December 31, 2015 and 2014, we recorded a curtailment charge of $0.1 million and $0.2 million, respectively, associated with permanently closing a portion of the Becancour, Canada chlor alkali facility that has been shut down since late June 2014. These charges were included in restructuring charges.

The defined benefit pension plans’ actuarial loss that will be recognized from accumulated other comprehensive loss into net periodic benefit income in 2016 will be approximately $22 million.

The service cost and the amortization of prior service cost components of pension expense related to the employees of the operating segments are allocated to the operating segments based on their respective estimated census data.

Pension Plan Assumptions

Certain actuarial assumptions, such as discount rate and long-term rate of return on plan assets, have a significant effect on the amounts reported for net periodic benefit cost and accrued benefit obligation amounts.  We use a measurement date of December 31 for our pension plans.

	U.S. Pension Benefits						Foreign Pension Benefits
Weighted-Average Assumptions	2015		2014		2013		2015		2014		2013
Discount rate—periodic benefit cost	3.9	%	4.5	%	3.9	%	2.8	%	4.8	%	4.2	%
Expected return on assets	7.75	%	7.75	%	7.75	%	6.0	%	7.5	%	7.75	%
Rate of compensation increase	3.0	%	3.0	%	3.0	%	3.0	%	3.5	%	3.5	%
Discount rate—benefit obligation	4.4	%	3.9	%	4.5	%	2.7	%	3.9	%	4.8	%

The discount rate is based on a hypothetical yield curve represented by a series of annualized individual zero-coupon bond spot rates for maturities ranging from one-half to thirty years.  The bonds used in the yield curve must have a rating of AA or better per Standard & Poor’s, be non-callable, and have at least $250 million par outstanding.  The yield curve is then applied to the projected benefit payments from the plan.  Based on these bonds and the projected benefit payment streams, the single rate that produces the same yield as the matching bond portfolio, rounded to the nearest quarter point, is used as the discount rate.

The long-term expected rate of return on plan assets represents an estimate of the long-term rate of returns on the investment portfolio consisting of equities, fixed income and alternative investments.  We use long-term historical actual return information, the allocation mix of investments that comprise plan assets, and forecast estimates of long-term investment returns, including inflation rates, by reference to external sources.  The historic rates of return on plan assets have been 7.5% for the last 5 years, 9.3% for the last 10 years and 8.0% for the last 15 years.  The following rates of return by asset class were considered in setting the long-term rate of return assumption:

U.S. equities	9%	to	13%
Non-U.S. equities	10%	to	14%
Fixed income/cash	5%	to	9%
Alternative investments	5%	to	15%
Absolute return strategies	8%	to	12%

Plan Assets

Our pension plan asset allocation at December 31, 2015 and 2014, by asset class was as follows:

	Percentage of Plan Assets
Asset Class	2015		2014
U.S. equities	4	%	4	%
Non-U.S. equities	6	%	7	%
Fixed income/cash	47	%	52	%
Acquisition plan receivable	10	%	—	%
Alternative investments	19	%	21	%
Absolute return strategies	14	%	16	%
Total	100	%	100	%

The Alternative Investments asset class includes hedge funds, real estate and private equity investments.  The Alternative Investments class is intended to help diversify risk and increase returns by utilizing a broader group of assets.

Absolute Return Strategies further diversify the plan’s assets through the use of asset allocations that seek to provide a targeted rate of return over inflation.  The investment managers allocate funds within asset classes that they consider to be undervalued in an effort to preserve gains in overvalued asset classes and to find opportunities in undervalued asset classes.

A master trust was established by our pension plan to accumulate funds required to meet benefit payments of our plan and is administered solely in the interest of our plan’s participants and their beneficiaries.  The master trust’s investment horizon is long term.  Its assets are managed by professional investment managers or invested in professionally managed investment vehicles.

Our pension plan maintains a portfolio of assets designed to achieve an appropriate risk adjusted return.  The portfolio of assets is also structured to protect the funding level from the negative impacts of interest rate changes on the asset and liability values.  This is accomplished by investing in a portfolio of assets with a maturity duration that approximately matches the duration of the plan liabilities.  Risk is managed by diversifying assets across asset classes whose return patterns are not highly correlated, investing in passively and actively managed strategies and in value and growth styles, and by periodic rebalancing of asset classes, strategies and investment styles to objectively set targets.

As of December 31, 2015, the following target allocation and ranges have been set for each asset class:

Asset Class	Target Allocation		Target Range
U.S. equities	6	%	0-14
Non-U.S. equities	6	%	0-14
Fixed income/cash	61	%	48-80
Alternative investments	7	%	0-28
Absolute return strategies	20	%	10-30

We have international qualified defined benefit pension plans to which we made cash contributions of $0.9 million and $0.8 million in 2015 and 2014, respectively, and we anticipate less than $5 million of cash contributions to international qualified defined benefit pension plans in 2016.

Determining which hierarchical level an asset or liability falls within requires significant judgment.  The following table summarizes our domestic and foreign defined benefit pension plan assets measured at fair value as of December 31, 2015:

Asset Class	Quoted Prices In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	($ in millions)
Equity securities
U.S. equities	$	36.4	$	43.2	$	—	$	79.6
Non-U.S. equities	0.8		121.9		—		122.7
Acquisition plan receivable	—		—		212.0		212.0
Fixed income/cash
Cash	60.1		—		—		60.1
Government treasuries	—		425.6		2.0		427.6
Corporate debt instruments	0.3		301.9		12.0		314.2
Asset-backed securities	—		155.6		—		155.6
Alternative investments
Hedge fund of funds	—		—		335.6		335.6
Real estate funds	—		—		27.4		27.4
Private equity funds	—		—		18.4		18.4
Absolute return strategies	—		264.6		18.7		283.3
Total assets	$	97.6	$	1,312.8	$	626.1	$	2,036.5

The following table summarizes our domestic and foreign defined benefit pension plan assets measured at fair value as of December 31, 2014:

Asset Class	Quoted Prices In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	($ in millions)
Equity securities
U.S. equities	$	69.8	$	12.4	$	—	$	82.2
Non-U.S. equities	35.4		115.5		—		150.9
Fixed income/cash
Cash	65.7		—		—		65.7
Government treasuries	—		465.6		4.3		469.9
Corporate debt instruments	0.4		329.7		9.6		339.7
Asset-backed securities	—		150.5		—		150.5
Alternative investments
Hedge fund of funds	—		—		358.8		358.8
Real estate funds	—		—		34.0		34.0
Private equity funds	—		—		17.7		17.7
Absolute return strategies	—		289.0		20.3		309.3
Total assets	$	171.3	$	1,362.7	$	444.7	$	1,978.7

U.S. equities—This class included actively and passively managed equity investments in common stock and commingled funds comprised primarily of large-capitalization stocks with value, core and growth strategies.

Non-U.S. equities—This class included actively managed equity investments in commingled funds comprised primarily of international large-capitalization stocks from both developed and emerging markets.

Acquisition plan receivable—This class included pension assets which will be transferred from TDCC’s U.S. qualified defined benefit pension plan trustee to our qualified defined benefit pension plan trustee in the form of cash related to the Acquisition. This amount is subject to certain post-closing adjustments.

Fixed income and cash—This class included commingled funds comprised of debt instruments issued by the U.S. and Canadian Treasuries, U.S. Agencies, corporate debt instruments, asset- and mortgage-backed securities and cash.

Hedge fund of funds—This class included a hedge fund which invests in the following types of hedge funds:

Event driven hedge funds—This class included hedge funds that invest in securities to capture excess returns that are driven by market or specific company events including activist investment philosophies and the arbitrage of equity and private and public debt securities.

Market neutral hedge funds—This class included investments in U.S. and international equities and fixed income securities while maintaining a market neutral position in those markets.

Other hedge funds—This class primarily included long-short equity strategies and a global macro fund which invested in fixed income, equity, currency, commodity and related derivative markets.

Real estate funds—This class included several funds that invest primarily in U.S. commercial real estate.

Private equity funds—This class included several private equity funds that invest primarily in infrastructure and U.S. power generation and transmission assets.

Absolute return strategies—This class included multiple strategies which use asset allocations that seek to provide a targeted rate of return over inflation.  The investment managers allocate funds within asset classes that they consider to be undervalued in an effort to preserve gains in overvalued asset classes and to find opportunities in undervalued asset classes.  

U.S. equities and non-U.S. equities are primarily valued at the net asset value provided by the independent administrator or custodian of the commingled fund.  The net asset value is based on the value of the underlying equities, which are traded on an active market.  U.S. equities are also valued at the closing price reported in an active market on which the individual securities are traded.  Fixed income investments are primarily valued at the net asset value provided by the independent administrator or custodian of the fund.  The net asset value is based on the underlying assets, which are valued using inputs such as the closing price reported, if traded on an active market, values derived from comparable securities of issuers with similar credit ratings, or under a discounted cash flow approach that utilizes observable inputs, such as current yields of similar instruments, but includes adjustments for risks that may not be observable such as certain credit and liquidity risks.  Alternative investments are primarily valued at the net asset value as determined by the independent administrator or custodian of the fund.  The net asset value is based on the underlying investments, which are valued using inputs such as quoted market prices of identical instruments, discounted future cash flows, independent appraisals and market-based comparable data.  Absolute return strategies are commingled funds which reflect the fair value of our ownership interest in these funds.  The investments in these commingled funds include some or all of the above asset classes and are primarily valued at net asset values based on the underlying investments, which are valued consistent with the methodologies described above for each asset class.

The following table summarizes the activity for our defined benefit pension plans level 3 assets for the year ended December 31, 2015:

	December 31, 2014		Realized Gain/(Loss)		Unrealized Gain/(Loss) Relating to Assets Held at Period End			Purchases, Sales, Settlements, and Other			Transfers In/(Out)		December 31, 2015
	($ in millions)
Acquisition plan receivable	$	—	$	—	$	—		$	212.0		$	—	$	212.0
Fixed income/cash
Government treasuries	4.3		—		(0.7		)	(1.6		)	—		2.0
Corporate debt instruments	9.6		0.5		(0.2		)	2.1			—		12.0
Alternative investments
Hedge fund of funds	358.8		7.2		(3.4		)	(27.0		)	—		335.6
Real estate funds	34.0		2.4		3.7			(12.7		)	—		27.4
Private equity funds	17.7		0.2		0.8			(0.3		)	—		18.4
Absolute return strategies	20.3		—		(0.5		)	(1.1		)	—		18.7
Total level 3 assets	$	444.7	$	10.3	$	(0.3	)	$	171.4		$	—	$	626.1

The following table summarizes the activity for our defined benefit pension plans level 3 assets for the year ended December 31, 2014:

	December 31, 2013		Realized Gain/(Loss)		Unrealized Gain/(Loss) Relating to Assets Held at Period End			Purchases, Sales, Settlements, and Other			Transfers In/(Out)		December 31, 2014
	($ in millions)
Fixed income/cash
Government treasuries	$	4.5	$	—	$	(0.3	)	$	0.1		$	—	$	4.3
Corporate debt instruments	21.5		2.0		(1.3		)	(12.6		)	—		9.6
Alternative investments
Hedge fund of funds	315.9		—		17.9			25.0			—		358.8
Real estate funds	35.7		1.6		2.0			(5.3		)	—		34.0
Private equity funds	17.9		—		(0.2		)	—			—		17.7
Absolute return strategies	18.7		—		0.8			0.8			—		20.3
Total level 3 assets	$	414.2	$	3.6	$	18.9		$	8.0		$	—	$	444.7

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POSTRETIREMENT BENEFITS

12 Months Ended

Dec. 31, 2015

POSTRETIREMENT BENEFITS Disclosure [Abstract]

POSTRETIREMENT BENEFITS

POSTRETIREMENT BENEFITS

We provide certain postretirement healthcare (medical) and life insurance benefits for eligible active and retired domestic employees.  The healthcare plans are contributory with participants’ contributions adjusted annually based on medical rates of inflation and plan experience.  We use a measurement date of December 31 for our postretirement plans.

Effective as of December 31, 2015, we changed the approach used to measure service and interest costs for our other postretirement benefits. For the year ended December 31, 2015, we measured service and interest costs utilizing a single weighted-average discount rate derived from the yield curve used to measure the plan obligations. Beginning in 2016 for our other postretirement benefits, we elected to measure service and interest costs by applying the specific spot rates along the yield curve to the plans’ estimated cash flows. We believe the new approach provides a more precise measurement of service and interest costs by aligning the timing of the plans’ liability cash flows to the corresponding spot rates on the yield curve. This change does not affect the measurement of our plan obligations. We have accounted for this change as a change in accounting estimate and, accordingly, have accounted for it on a prospective basis.

Other Postretirement Benefits Obligations and Funded Status

Changes in the benefit obligation were as follows:

	December 31, 2015									December 31, 2014
	($ in millions)									($ in millions)
Change in Benefit Obligation	U.S.			Foreign			Total			U.S.			Foreign			Total
Benefit obligation at beginning of year	$	58.5		$	8.7		$	67.2		$	59.0		$	8.6		$	67.6
Service cost	1.1			0.1			1.2			1.0			0.1			1.1
Interest cost	2.0			0.3			2.3			2.3			0.4			2.7
Actuarial loss (gain)	(0.7		)	0.7			—			2.4			0.7			3.1
Benefits paid	(7.0		)	(0.3		)	(7.3		)	(6.2		)	(0.4		)	(6.6		)
Currency translation adjustments	—			(1.5		)	(1.5		)	—			(0.7		)	(0.7		)
Curtailment	—			0.1			0.1			—			—			—
Benefit obligation at end of year	$	53.9		$	8.1		$	62.0		$	58.5		$	8.7		$	67.2

	December 31, 2015									December 31, 2014
	($ in millions)									($ in millions)
	U.S.			Foreign			Total			U.S.			Foreign			Total
Funded status	$	(53.9	)	$	(8.1	)	$	(62.0	)	$	(58.5	)	$	(8.7	)	$	(67.2	)

Under ASC 715 we recorded an after-tax benefit of less than $0.1 million ($0.1 million pretax) to shareholders’ equity as of December 31, 2015 for our other postretirement plans.  In 2014, we recorded a $1.8 million after-tax charge ($3.1 million pretax) to shareholders’ equity as of December 31, 2014 for our other postretirement plans.

Amounts recognized in the consolidated balance sheets consisted of:

	December 31, 2015									December 31, 2014
	($ in millions)									($ in millions)
	U.S.			Foreign			Total			U.S.			Foreign			Total
Accrued benefit in current liabilities	$	(5.3	)	$	(0.3	)	$	(5.6	)	$	(5.2	)	$	(0.3	)	$	(5.5	)
Accrued benefit in noncurrent liabilities	(48.6		)	(7.8		)	(56.4		)	(53.3		)	(8.4		)	(61.7		)
Accumulated other comprehensive loss	29.7			0.2			29.9			33.6			(0.4		)	33.2
Net balance sheet impact	$	(24.2	)	$	(7.9	)	$	(32.1	)	$	(24.9	)	$	(9.1	)	$	(34.0	)

	Years Ended December 31,
	2015			2014			2013
Components of Net Periodic Benefit Cost	($ in millions)
Service cost	$	1.2		$	1.1		$	1.3
Interest cost	2.3			2.7			2.6
Amortization of prior service cost	—			(0.1		)	(0.1		)
Recognized actuarial loss	3.1			2.9			3.7
Curtailment	0.1			—			—
Net periodic benefit cost	$	6.7		$	6.6		$	7.5
Included in Other Comprehensive Loss (Pretax)
Liability adjustment	$	(0.1	)	$	3.1		$	(1.9	)
Amortization of prior service costs and actuarial losses	(3.2		)	(2.8		)	(3.6		)

For the year ended December 31, 2015, we recorded a curtailment charge of $0.1 million associated with permanently closing a portion of the Becancour, Canada chlor alkali facility that has been shut down since late June 2014. This charge was included in restructuring charges.

The other postretirement plans’ actuarial loss that will be recognized from accumulated other comprehensive loss into net periodic benefit cost in 2016 will be approximately $3 million.

The service cost and amortization of prior service cost components of postretirement benefit expense related to the employees of the operating segments are allocated to the operating segments based on their respective estimated census data.

Other Postretirement Benefits Plan Assumptions

Certain actuarial assumptions, such as discount rate, have a significant effect on the amounts reported for net periodic benefit cost and accrued benefit obligation amounts.

	December 31,
Weighted-Average Assumptions	2015		2014		2013
Discount rate—periodic benefit cost	3.7	%	4.3	%	3.6	%
Discount rate—benefit obligation	4.1	%	3.7	%	4.3	%

The discount rate is based on a hypothetical yield curve represented by a series of annualized individual zero-coupon bond spot rates for maturities ranging from one-half to thirty years.  The bonds used in the yield curve must have a rating of AA or better per Standard & Poor’s, be non-callable, and have at least $250 million par outstanding.  The yield curve is then applied to the projected benefit payments from the plan.  Based on these bonds and the projected benefit payment streams, the single rate that produces the same yield as the matching bond portfolio, rounded to the nearest quarter point, is used as the discount rate.

We review external data and our own internal trends for healthcare costs to determine the healthcare cost for the post retirement benefit obligation.  The assumed healthcare cost trend rates for pre-65 retirees were as follows:

	December 31,
	2015		2014
Healthcare cost trend rate assumed for next year	8.5	%	8.5	%
Rate that the cost trend rate gradually declines to	5.0	%	5.0	%
Year that the rate reaches the ultimate rate	2022		2021

For post-65 retirees, we provide a fixed dollar benefit, which is not subject to escalation.

Assumed healthcare cost trend rates have an effect on the amounts reported for the healthcare plans.  A one-percentage-point change in assumed healthcare cost trend rates would have the following effects:

	One-Percentage Point Increase		One-Percentage Point Decrease
	($ in millions)
Effect on total of service and interest costs	$	0.2	$	(0.2	)
Effect on postretirement benefit obligation	3.1		(2.6		)

We expect to make payments of approximately $5 million for each of the next five years under the provisions of our other postretirement benefit plans.

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INCOME TAXES

3 Months Ended

12 Months Ended

Mar. 31, 2016

Dec. 31, 2015

Income Tax Disclosure [Abstract]

INCOME TAXES

INCOME TAXES

The following table accounts for the difference between the actual tax provision and the amounts obtained by applying the statutory U.S. federal income tax rate of 35.0% to income before taxes.

	Three Months Ended March 31,
Effective Tax Rate Reconciliation (Percent)	2016		2015
Statutory federal tax rate	35.0	%	35.0	%
Foreign rate differential	(3.8	)	(0.1	)
U.S. tax on foreign earnings	3.8		—
Domestic manufacturing/export tax incentive	—		(3.0	)
Salt Depletion	(3.4	)	(0.6	)
Dividends paid to CEOP	(0.6	)	(0.6	)
State income taxes, net	(1.4	)	0.6
Change in valuation allowance	0.1		1.0
Change in tax contingencies	1.6		—
Other, net	0.3		0.9
Effective tax rate	31.6	%	33.2	%

The condensed balance sheets include income tax receivables that are classified as other noncurrent assets of $1.5 million, $1.5 million and $6.6 million at March 31, 2016, December 31, 2015 and March 31, 2015, respectively.

As of March 31, 2016, we had $33.5 million of gross unrecognized tax benefits, which would have a net $31.9 million impact on the effective tax rate, if recognized. As of March 31, 2015, we had $36.1 million of gross unrecognized tax benefits, of which $35.0 million would have impacted the effective tax rate, if recognized. The amount of unrecognized tax benefits was as follows:

	March 31,
	2016			2015
	($ in millions)
Balance at beginning of year	$	35.1		$	36.1
Decreases for prior year tax positions	(1.6		)	—
Balance at end of period	$	33.5		$	36.1

As of March 31, 2016, we believe it is reasonably possible that our total amount of unrecognized tax benefits will decrease by approximately $9.5 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. Our U.S. federal income tax returns are under examination by the Internal Revenue Service (IRS) for tax years 2008 and 2010 to 2012. In connection with the Acquisition, TDCC retained liabilities relating to taxes to the extent arising prior to the Closing Date. 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	2008; 2010 - 2015
U.S. state income tax	2006 - 2015
Canadian federal income tax	2012 - 2015
Brazil	2014 - 2015
Germany	2015
China	2014 - 2015
The Netherlands	2014 - 2015
South Korea	2014 - 2015
Hong Kong	2015

INCOME TAXES

	Years ended December 31,
	2015			2014			2013
Components of Income from Continuing Operations Before Taxes	($ in millions)
Domestic	$	(66.9	)	$	164.4		$	222.2
Foreign	73.6			(1.7		)	27.8
Income from continuing operations before taxes	$	6.7		$	162.7		$	250.0
Components of Income Tax Provision
Current expense (benefit):
Federal	$	(16.6	)	$	25.9		$	42.1
State	1.2			1.3			9.4
Foreign	14.4			5.3			8.5
	(1.0		)	32.5			60.0
Deferred expense (benefit):
Federal	$	8.9		$	26.9		$	10.4
State	(2.4		)	3.0			1.9
Foreign	2.6			(4.7		)	(0.9		)
	9.1			25.2			11.4
Income tax provision	$	8.1		$	57.7		$	71.4

The following table accounts for the difference between the actual tax provision and the amounts obtained by applying the statutory U.S. federal income tax rate of 35% to the income from continuing operations before taxes.

	Years ended December 31,
Effective Tax Rate Reconciliation (Percent)	2015		2014		2013
Statutory federal tax rate	35.0	%	35.0	%	35.0	%
State income taxes, net	(38.2	)	2.4		2.3
Foreign rate differential	(129.8	)	0.4		(0.9	)
U.S. tax on foreign earnings	128.6		(0.6	)	0.8
Domestic manufacturing/export tax incentive	—		(1.8	)	(1.6	)
Salt depletion	(38.8	)	(0.5	)	(0.3	)
Non-deductible transaction costs	133.1		—		—
Change in valuation allowance	27.9		1.1		(2.1	)
Remeasurement of deferred taxes	7.6		0.4		0.1
Change in tax contingencies	5.0		(0.3	)	(3.8	)
Dividends paid to CEOP	(11.1	)	(0.5	)	(0.3	)
Return to provision	(4.2	)	(0.7	)	(0.1	)
Research tax credit	(3.1	)	—		(0.8	)
Other, net	8.9		0.6		0.3
Effective tax rate	120.9	%	35.5	%	28.6	%

The effective tax rate from continuing operations for 2015 included $8.9 million of expense associated with certain transaction costs related to the Acquisition that are not deductible for U.S. tax purposes and $8.6 million of expense associated with incremental U.S. tax on foreign earnings. These items were partially offset by $8.7 million of benefit associated with foreign earnings taxed at a lower rate than the U.S. statutory rate and $2.6 million of benefit associated with salt depletion deductions. The effective tax rate from continuing operations for 2014 included $1.2 million of benefit associated with return to provision adjustments for the finalization of our 2013 U.S. federal and state income tax returns and $0.7 million of benefit associated with the expiration of the statutes of limitations in federal and state jurisdictions. These items were partially offset by $0.8 million of expense associated with increases in valuation allowances on certain state tax credit balances, primarily due to a change in state tax law, and $0.6 million of expense related to the remeasurement of deferred taxes due to an increase in state effective tax rates. The effective tax rate from continuing operations for 2013 included $11.4 million of benefit associated with the expiration of the statutes of limitations in federal and state jurisdictions, $8.3 million of benefit associated with reductions in valuation allowances on our capital loss carryforwards and $1.9 million of benefit associated with the Research Credit, which were partially offset by $1.8 million of expense associated with changes in tax contingencies and $1.3 million of expense associated with increases in valuation allowances on certain state tax credits carryforwards.

	December 31,
Components of Deferred Tax Assets and Liabilities	2015			2014
	($ in millions)
Deferred tax assets:
Pension and postretirement benefits	$	235.2		$	108.0
Environmental reserves	55.3			56.5
Asset retirement obligations	21.0			22.9
Accrued liabilities	53.7			52.5
Tax credits	23.3			9.2
Federal and state net operating losses	40.1			3.3
Capital loss carryforward	4.7			4.8
Other miscellaneous items	18.5			10.0
Total deferred tax assets	451.8			267.2
Valuation allowance	(29.3		)	(16.6		)
Net deferred tax assets	422.5			250.6
Deferred tax liabilities:
Property, plant and equipment	875.6			174.5
Intangible amortization	138.4			14.2
Inventory and prepaids	11.6			4.5
Partnerships	101.4			97.8
Taxes on unremitted earnings	294.8			—
Total deferred tax liabilities	1,421.8			291.0
Net deferred tax liability	$	(999.3	)	$	(40.4	)

Realization of the net deferred tax assets, irrespective of indefinite-lived deferred tax liabilities, is dependent on future reversals of existing taxable temporary differences and adequate future taxable income, exclusive of reversing temporary differences and carryforwards.  Although realization is not assured, we believe that it is more likely than not that the net deferred tax assets will be realized.

At December 31, 2015, we had a U.S. net operating loss carryforward (NOL) of approximately $75.9 million (representing $26.6 million of deferred tax assets), that will expire in years 2017 through 2035, if not utilized.  The utilization of $2.5 million of the deferred tax assets are limited under Section 382 of the U.S. Internal Revenue Code to $0.5 million in each year through 2020.  

At December 31, 2015, we had deferred state tax benefits of $9.3 million relating to state NOLs, which are available to offset future state taxable income through 2035.

At December 31, 2015, we had deferred state tax benefits of $13.6 million relating to state tax credits, which are available to offset future state tax liabilities through 2030.

At December 31, 2015, we had a capital loss carryforward of $12.3 million (representing $4.7 million of deferred tax assets) that is available to offset future consolidated capital gains that will expire in years 2016 through 2020 if not utilized.  

At December 31, 2015, we had a NOL of approximately $23.1 million (representing $4.2 million of deferred tax assets) in various foreign jurisdictions. Of these, $8.2 million (representing $1.7 million of deferred tax assets) expire in various years from 2020 to 2025. The remaining $14.9 million (representing $2.5 million of deferred tax assets) do not expire.

The activity of our deferred income tax valuation allowance was as follows:

	December 31,
	2015			2014
	($ in millions)
Beginning balance	$	16.6		$	13.4
Charged to income tax provision	1.8			4.1
Acquisition activity	12.3			—
Deductions from reserves - credited to income tax provision	(1.4		)	(0.9		)
Ending balance	$	29.3		$	16.6

As of December 31, 2015, we had $35.1 million of gross unrecognized tax benefits, which would have a net $33.5 million impact on the effective tax rate from continuing operations, if recognized.  As of December 31, 2014, we had $36.1 million of gross unrecognized tax benefits, which would have a net $35.0 million impact on the effective tax rate from continuing operations, if recognized.  The change for 2015 primarily relates to additional gross unrecognized benefits for prior year tax positions, as well as the settlement of ongoing audits.  The change for 2014 primarily relates to additional gross unrecognized benefits for current year and prior year tax positions, as well as the expiration of statute of limitations in domestic jurisdictions and settlement of ongoing audits. The amounts of unrecognized tax benefits were as follows:

	December 31,
	2015			2014
	($ in millions)
Beginning balance	$	36.1		$	34.5
Increase for current year tax positions	—			2.2
Increase for prior year tax positions	0.2			0.2
Reductions due to statute of limitations	—			(0.4		)
Decrease for prior year tax positions	—			(0.3		)
Decrease due to tax settlements	(1.2		)	(0.1		)
Ending balance	$	35.1		$	36.1

Income from discontinued operations, net for the year ended December 31, 2014 included $2.2 million of tax expense related to changes in tax contingencies.

We recognize interest and penalty expense related to unrecognized tax positions as a component of the income tax provision.  As of December 31, 2015 and 2014, interest and penalties accrued were $3.4 million and $3.2 million, respectively.  For 2015, 2014 and 2013, we recorded expense (benefit) related to interest and penalties of $0.2 million, $0.4 million and $(0.5) million, respectively.

As of December 31, 2015, we believe it is reasonably possible that our total amount of unrecognized tax benefits will decrease by approximately $9.4 million over the next twelve months.  The anticipated reduction primarily relates to settlements with tax authorities and the expiration of federal, state and foreign statutes of limitation.

We operate globally and file income tax returns in numerous jurisdictions.  Our tax returns are subject to examination by various federal, state and local tax authorities.  Our U.S. federal income tax returns are under examination by the Internal Revenue Service (IRS) for tax years 2008 and 2010 to 2012. Our Canadian federal income tax returns are under examination by Canada Revenue Authority (CRA) for tax years 2010 and 2011. In connection with the Acquisition, TDCC retained liabilities relating to taxes to the extent arising prior to the Closing Date. 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	2008; 2010 - 2015
U.S. state income tax	2006 - 2014
Canadian federal income tax	2010 - 2014
Brazil	2014 - 2015
Germany	2015
China	2014 - 2015
The Netherlands	2014 - 2015
South Korea	2014 - 2015
Hong Kong	2015

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ACCRUED LIABILITIES

12 Months Ended

Dec. 31, 2015

Accrued Liabilities, Current [Abstract]

ACCRUED LIABILITIES

ACCRUED LIABILITIES

Included in accrued liabilities were the following:

	December 31,
	2015		2014
	($ in millions)
Acquisition-related accruals	$	90.2	$	—
Accrued compensation and payroll taxes	53.4		40.4
Accrued interest	35.0		4.7
Legal and professional costs	32.0		26.3
Accrued employee benefits	24.4		41.5
Environmental (current portion only)	19.0		19.0
Asset retirement obligation (current portion only)	7.3		10.2
Other	66.8		72.2
Accrued liabilities	$	328.1	$	214.3

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CONTRIBUTING EMPLOYEE OWNERSHIP PLAN

12 Months Ended

Dec. 31, 2015

Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]

CONTRIBUTING EMPLOYEE OWNERSHIP PLAN

CONTRIBUTING EMPLOYEE OWNERSHIP PLAN

The CEOP is a defined contribution plan available to essentially all domestic employees.  Company matching contributions are invested in the same investment allocation as the employee’s contribution.  Our matching contributions for eligible employees amounted to $6.9 million, $5.7 million and $5.2 million in 2015, 2014 and 2013, respectively.

Employees generally become vested in the value of the contributions we make to the CEOP according to a schedule based on service.  After two years of service, participants are 25% vested.  They vest in increments of 25% for each additional year and after five years of service, they are 100% vested in the value of the contributions that we have made to their accounts.

Employees may transfer any or all of the value of the investments, including Olin common stock, to any one or combination of investments available in the CEOP.  Employees may transfer balances daily and may elect to transfer any percentage of the balance in the fund from which the transfer is made.  However, when transferring out of a fund, employees are prohibited from trading out of the fund to which the transfer was made for seven calendar days.  This limitation does not apply to trades into the money market fund or the Olin Common Stock Fund.

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STOCK-BASED COMPENSATION

3 Months Ended

12 Months Ended

Mar. 31, 2016

Dec. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

STOCK-BASED COMPENSATION

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,
		2016		2015
	($ in millions)
Stock-based compensation		$	4.4	$	2.5
Mark-to-market adjustments		0.4		5.2
Total expense		$	4.8	$	7.7

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	2016			2015
Dividend yield	6.09		%	2.92		%
Risk-free interest rate	1.35		%	1.69		%
Expected volatility	32		%	34		%
Expected life (years)	6.0			6.0
Weighted average grant fair value (per option)	$	1.90		$	6.80
Weighted average exercise price	$	13.14		$	27.40
Shares granted	1,670,400			776,750

Dividend yield for 2016 and 2015 was based on a historical average. 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.

STOCK-BASED COMPENSATION

Stock-based compensation expense was allocated to the operating segments for the portion related to employees whose compensation would be included in cost of goods sold with the remainder recognized in corporate/other.  There were no significant capitalized stock-based compensation costs.  Stock-based compensation granted includes stock options, performance stock awards, restricted stock awards and deferred directors’ compensation.  Stock-based compensation expense was as follows:

	Years ended December 31,
	2015			2014			2013
	($ in millions)
Stock-based compensation	$	11.5		$	9.2		$	13.3
Mark-to-market adjustments	(3.0		)	(3.6		)	4.2
Total expense	$	8.5		$	5.6		$	17.5

Stock Plans

Under the stock option and long-term incentive plans, options may be granted to purchase shares of our common stock at an exercise price not less than fair market value at the date of grant, and are exercisable for a period not exceeding ten years from that date.  Stock options, restricted stock and performance shares typically vest over three years.  We issue shares to settle stock options, restricted stock and share-based performance awards.  In 2015, 2014 and 2013 long-term incentive awards included stock options, performance share awards and restricted stock.  The stock option exercise price was set at the fair market value of common stock on the date of the grant, and the options have a ten-year term.

Stock option transactions were as follows:

						Exercisable
	Shares		Option Price	Weighted-Average Option Price		Options	Weighted-Average Exercise Price
Outstanding at January 1, 2015	4,133,753		$14.28-27.64	$	20.14	2,976,870	$	18.50
Granted	776,750		27.40	27.40
Exercised	(147,608	)	14.28-25.57	20.11
Canceled	(42,790	)	23.28-27.40	25.14
Outstanding at December 31, 2015	4,720,105		$14.28-27.65	$	21.29	3,371,449	$	19.28

At December 31, 2015, the average exercise period for all outstanding and exercisable options was 65 months and 50 months, respectively.  At December 31, 2015, the aggregate intrinsic value (the difference between the exercise price and market value) for outstanding options was $2.5 million and exercisable options was $2.5 million.  The total intrinsic value of options exercised during the years ended December 31, 2015, 2014 and 2013 was $1.3 million, $3.9 million and $4.2 million, respectively.

The total unrecognized compensation cost related to unvested stock options at December 31, 2015 was $5.3 million and was expected to be recognized over a weighted-average period of 1.3 years.

The following table provides certain information with respect to stock options exercisable at December 31, 2015:

Range of Exercise Prices	Options Exercisable	Weighted-Average Exercise Price		Options Outstanding	Weighted-Average Exercise Price
Under $16.00	916,046	$	15.05	916,046	$	15.05
$16.00 – $22.00	1,870,281	19.85		1,870,281	19.85
Over $22.00	585,122	24.11		1,933,778	25.65
	3,371,449			4,720,105

At December 31, 2015, common shares reserved for issuance and available for grant or purchase under the following plans consisted of:

	Number of Shares
Stock Option Plans	Reserved for Issuance	Available for Grant or Purchase(1)
2000 long term incentive plan	277,586	2,911
2003 long term incentive plan	389,921	10,138
2006 long term incentive plan	1,591,479	168,783
2009 long term incentive plan	2,762,161	506,610
2014 long term incentive plan	3,000,000	2,009,000
Total under stock option plans	8,021,147	2,697,442

	Number of Shares
Stock Purchase Plans	Reserved for Issuance	Available for Grant or Purchase
1997 stock plan for non-employee directors	572,978	567,476
Employee deferral plan	45,627	45,623
Total under stock purchase plans	618,605	613,099

(1) All available to be issued as stock options, but includes a sub-limit for all types of stock awards of 1,420,442 shares.

Under the stock purchase plans, our non-employee directors may defer certain elements of their compensation into shares of our common stock based on fair market value of the shares at the time of deferral.  Non-employee directors annually receive stock grants as a portion of their director compensation.  Of the shares reserved under the stock purchase plans at December 31, 2015, 5,501 shares were committed.

Performance share awards are denominated in shares of our stock and are paid half in cash and half in stock.  Payouts are based on Olin’s average annual return on capital over a three-year performance cycle in relation to the average annual return on capital over the same period among a portfolio of public companies which are selected in concert with outside compensation consultants.  The expense associated with performance shares is recorded based on our estimate of our performance relative to the respective target.  If an employee leaves the company before the end of the performance cycle, the performance shares may be prorated based on the number of months of the performance cycle worked and are settled in cash instead of half in cash and half in stock when the three-year performance cycle is completed.  Performance share transactions were as follows:

	To Settle in Cash				To Settle in Shares
	Shares		Weighted-Average Fair Value per Share		Shares		Weighted-Average Fair Value per Share
Outstanding at January 1, 2015	290,917		$	23.04	281,000		$	23.46
Granted	126,000		27.40		126,000		27.40
Paid/Issued	(105,611	)	23.04		(101,000	)	21.92
Converted from shares to cash	2,111		24.42		(2,111	)	24.42
Canceled	(1,889	)	25.83		(1,889	)	26.49
Outstanding at December 31, 2015	311,528		$	17.48	302,000		$	25.59
Total vested at December 31, 2015	201,528		$	17.48	192,000		$	24.81

The summary of the status of our unvested performance shares to be settled in cash were as follows:

	Shares		Weighted-Average Fair Value per Share
Unvested at January 1, 2015	87,334		$	23.04
Granted	126,000		27.40
Vested	(101,445	)	17.48
Canceled	(1,889	)	25.83
Unvested at December 31, 2015	110,000		$	17.48

At December 31, 2015, the liability recorded for performance shares to be settled in cash totaled $3.5 million.  The total unrecognized compensation cost related to unvested performance shares at December 31, 2015 was $4.9 million and was expected to be recognized over a weighted-average period of 1.2 years.

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SHAREHOLDERS' EQUITY

3 Months Ended

12 Months Ended

Mar. 31, 2016

Dec. 31, 2015

Stockholders' Equity Note [Abstract]

SHAREHOLDERS' EQUITY

SHAREHOLDERS’ EQUITY

On April 24, 2014, our board of directors authorized a share repurchase program for up to 8 million shares of common stock that will terminate in three years for any of the remaining shares not yet repurchased. For the three months ended March 31, 2016 and 2015, no shares were purchased and retired. As of March 31, 2016, we had purchased a total of 1.9 million shares under the April 2014 program, and 6.1 million shares remained authorized to be purchased. Under the Merger Agreement relating to the Acquisition, we were restricted from repurchasing shares of our common stock prior to the consummation of the Merger. For a period of two years subsequent to the Closing Date of the Merger, we will continue to be subject to certain restrictions on our ability to conduct share repurchases.

We issued 0.1 million shares representing stock options exercised for the three months ended March 31, 2015, with a total value of $2.8 million.

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 Postretirement Benefits (net of taxes)			Accumulated Other Comprehensive Loss
	($ in millions)
Balance at January 1, 2015	$	(2.3	)	$	(4.2	)	$	(436.6	)	$	(443.1	)
Unrealized losses	(1.4		)	(2.4		)	—			(3.8		)
Reclassification adjustments into income	—			1.9			8.6			10.5
Tax benefit (provision)	—			0.2			(3.5		)	(3.3		)
Net Change	(1.4		)	(0.3		)	5.1			3.4
Balance at March 31, 2015	$	(3.7	)	$	(4.5	)	$	(431.5	)	$	(439.7	)
Balance at January 1, 2016	$	(12.1	)	$	(6.9	)	$	(473.5	)	$	(492.5	)
Unrealized gains	24.0			1.1			—			25.1
Reclassification adjustments into income	—			3.7			6.1			9.8
Tax provision	(8.5		)	(1.8		)	(2.3		)	(12.6		)
Net Change	15.5			3.0			3.8			22.3
Balance at March 31, 2016	$	3.4		$	(3.9	)	$	(469.7	)	$	(470.2	)

Net (loss) income and cost of goods sold included reclassification adjustments for realized gains and losses on derivative contracts from accumulated other comprehensive loss.

Net (loss) income, cost of goods sold and selling and administrative expenses included the amortization of prior service costs and actuarial losses from accumulated other comprehensive loss. This amortization is recognized equally in cost of goods sold and selling and administrative expenses.

SHAREHOLDERS’ EQUITY

On April 24, 2014, our board of directors authorized a new share repurchase program for up to 8 million shares of common stock that will terminate in three years for any of the remaining shares not yet repurchased.  This authorization replaced the July 2011 share repurchase program. For the year ended December 31, 2015, no shares were purchased and retired. We repurchased and retired 2.5 million and 1.5 million shares in 2014 and 2013, respectively, at a cost of $64.8 million and $36.2 million, respectively.  As of December 31, 2015, we had repurchased a total of 1.9 million shares under the April 2014 program, and 6.1 million shares remained authorized to be purchased. Under the Merger Agreement relating to the Acquisition, we were restricted from repurchasing shares of our common stock prior to the consummation of the Merger. For a period of two years subsequent to the Closing Date of the Merger, we will continue to be subject to certain restrictions on our ability to conduct share repurchases.

During 2015, 2014 and 2013, we issued 0.1 million, 0.5 million and 0.5 million shares, respectively, with a total value of $3.1 million, $12.1 million and $9.7 million, respectively, representing stock options exercised.  

We have registered an undetermined amount of securities with the SEC, so that, from time-to-time, we may issue debt securities, preferred stock and/or common stock and associated warrants in the public market under that registration statement.

The following table represents the activity included in accumulated other comprehensive loss:

	Foreign Currency Translation Adjustment (net of taxes)			Unrealized Gains (Losses) on Derivative Contracts (net of taxes)			Pension and Postretirement Benefits (net of taxes)			Accumulated Other Comprehensive Loss
	($ in millions)
Balance at January 1, 2013	$	2.1		$	4.7		$	(378.1	)	$	(371.3	)
Unrealized losses	(2.6		)	(7.7		)	(12.5		)	(22.8		)
Reclassification adjustments into income	—			1.4			33.3			34.7
Tax benefit (provision)	—			2.5			(8.2		)	(5.7		)
Net change	(2.6		)	(3.8		)	12.6			6.2
Balance at December 31, 2013	(0.5		)	0.9			(365.5		)	(365.1		)
Unrealized losses	(1.8		)	(10.2		)	(142.0		)	(154.0		)
Reclassification adjustments into income	—			1.8			25.5			27.3
Tax benefit	—			3.3			45.4			48.7
Net change	(1.8		)	(5.1		)	(71.1		)	(78.0		)
Balance at December 31, 2014	(2.3		)	(4.2		)	(436.6		)	(443.1		)
Unrealized losses	(15.7		)	(13.9		)	(125.3		)	(154.9		)
Reclassification adjustments into income	—			9.7			65.6			75.3
Tax benefit	5.9			1.5			22.8			30.2
Net change	(9.8		)	(2.7		)	(36.9		)	(49.4		)
Balance at December 31, 2015	$	(12.1	)	$	(6.9	)	$	(473.5	)	$	(492.5	)

Net (loss) income and cost of goods sold included reclassification adjustments for realized gains and losses on derivative contracts from accumulated other comprehensive loss.

Net (loss) income, cost of goods sold and selling and administration expenses included the amortization of prior service costs and actuarial losses from accumulated other comprehensive loss. This amortization is recognized equally in cost of goods sold and selling and administration expenses.

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SEGMENT INFORMATION

3 Months Ended

12 Months Ended

Mar. 31, 2016

Dec. 31, 2015

Segment Reporting [Abstract]

SEGMENT INFORMATION

SEGMENT INFORMATION

We define segment results as income (loss) before interest expense, interest income, other operating income (expense), and income taxes, and include the operating results of non-consolidated affiliates. Consistent with the guidance in ASC 280 “Segment Reporting” (ASC 280), we have determined it is appropriate to include the operating results of non-consolidated affiliates in the relevant segment financial results. Beginning in the fourth quarter of 2015, we modified our reportable segments due to changes in our organization resulting from the Acquisition. We have three operating segments: Chlor Alkali Products and Vinyls, Epoxy and Winchester. For segment reporting purposes, the Acquired Business’s Global Epoxy operating results comprise the newly created Epoxy segment and the Acquired Chlor Alkali Business operating results combined with our former Chlor Alkali Products and Chemical Distribution segments comprise the newly created Chlor Alkali Products and Vinyls segment. The new reporting structure has been retrospectively applied to the financial results for all periods presented. 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.

		Three Months Ended March 31,
		2016			2015
Sales:	($ in millions)
Chlor Alkali Products and Vinyls		$	704.3		$	339.3
Epoxy		460.2			—
Winchester		183.7			178.7
Total sales		$	1,348.2		$	518.0
Income (loss) before taxes:
Chlor Alkali Products and Vinyls		$	68.1		$	24.1
Epoxy		8.2			—
Winchester		28.7			29.8
Corporate/other:
Pension income		12.2			7.1
Environmental expense		(2.7		)	(0.7		)
Other corporate and unallocated costs		(29.6		)	(22.1		)
Restructuring charges		(92.8		)	(1.2		)
Acquisition-related costs		(10.2		)	(10.4		)
Other operating income (expense)		10.9			(0.2		)
Interest expense		(48.5		)	(7.1		)
Interest income		0.3			0.3
Income (loss) before taxes		$	(55.4	)	$	19.6

SEGMENT INFORMATION

We define segment results as income (loss) from continuing operations before interest expense, interest income, other operating income, other income (expense) and income taxes, and include the results of non-consolidated affiliates.  Consistent with the guidance in ASC 280, we have determined it is appropriate to include the operating results of non-consolidated affiliates in the relevant segment financial results. Beginning in the fourth quarter of 2015, we modified our reportable segments due to changes in our organization resulting from the Acquisition. We have three operating segments: Chlor Alkali Products and Vinyls, Epoxy and Winchester. For segment reporting purposes, the Acquired Business’s Global Epoxy operating results comprise the newly created Epoxy segment and the Acquired Chlor Alkali Business operating results combined with our former Chlor Alkali Products and Chemical Distribution segments comprise the newly created Chlor Alkali Products and Vinyls segment. The new reporting structure has been retrospectively applied to financial results for all periods presented. 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.

	Years ended December 31,
	2015			2014			2013
Sales:	($ in millions)
Chlor Alkali Products and Vinyls	$	1,713.4		$	1,502.8		$	1,737.4
Epoxy	429.6			—			—
Winchester	711.4			738.4			777.6
Total sales	$	2,854.4		$	2,241.2		$	2,515.0
Income (loss) from continuing operations before taxes:
Chlor Alkali Products and Vinyls	$	115.5		$	130.1		$	213.5
Epoxy	(7.5		)	—			—
Winchester	115.6			127.3			143.2
Corporate/Other	(40.8		)	(33.9		)	(62.6		)
Restructuring charges	(2.7		)	(15.7		)	(5.5		)
Acquisition-related costs	(123.4		)	(4.2		)	—
Other operating income	45.7			1.5			0.7
Interest expense	(97.0		)	(43.8		)	(38.6		)
Interest income	1.1			1.3			0.6
Other income (expense)	0.2			0.1			(1.3		)
Income from continuing operations before taxes	$	6.7		$	162.7		$	250.0
Earnings of non-consolidated affiliates:
Chlor Alkali Products and Vinyls	$	1.7		$	1.7		$	2.8
Depreciation and amortization expense:
Chlor Alkali Products and Vinyls	$	186.1		$	119.4		$	117.5
Epoxy	20.9			—			—
Winchester	17.4			16.3			14.9
Corporate/Other	4.5			3.4			2.9
Total depreciation and amortization expense	$	228.9		$	139.1		$	135.3
Capital spending:
Chlor Alkali Products and Vinyls	$	94.5		$	49.6		$	68.0
Epoxy	7.7			—			—
Winchester	25.6			21.4			21.2
Corporate/Other	3.1			0.8			1.6
Total capital spending	$	130.9		$	71.8		$	90.8

	December 31,
	2015		2014
Assets:	($ in millions)
Chlor Alkali Products and Vinyls	$	6,690.7	$	1,939.0
Epoxy	1,591.2		—
Winchester	411.9		361.0
Corporate/Other	595.1		389.2
Total assets	$	9,288.9	$	2,689.2
Investments—affiliated companies (at equity):
Chlor Alkali Products and Vinyls	$	25.0	$	23.3

Segment assets include only those assets which are directly identifiable to an operating segment.  Assets of the corporate/other segment include primarily such items as cash and cash equivalents, deferred taxes, restricted cash and other assets.

	Years ended December 31,
Geographic Data	2015		2014		2013
Sales:	($ in millions)
United States	$	2,208.5	$	2,051.4	$	2,316.2
Foreign	645.9		189.8		198.8
Total sales	$	2,854.4	$	2,241.2	$	2,515.0

	December 31,
	2015		2014
Long-lived assets:	($ in millions)
United States	$	3,561.7	$	889.6
Foreign	391.7		41.4
Total long-lived assets	$	3,953.4	$	931.0

Sales are attributed to geographic areas based on customer location and long-lived assets are attributed to geographic areas based on asset location.

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ENVIRONMENTAL

3 Months Ended

12 Months Ended

Mar. 31, 2016

Dec. 31, 2015

Environmental Remediation Obligations [Abstract]

ENVIRONMENTAL

ENVIRONMENTAL

We are party to various government and private environmental actions associated with past manufacturing facilities and former waste disposal sites. Charges to income for investigatory and remedial efforts were material to operating results in 2015 and are expected to be material in 2016. The condensed balance sheets included reserves for future environmental expenditures to investigate and remediate known sites amounting to $139.2 million, $138.1 million and $136.0 million at March 31, 2016, December 31, 2015 and March 31, 2015, respectively, of which $120.2 million, $119.1 million and $117.0 million, respectively, were classified as other noncurrent liabilities.

Environmental provisions charged to income, which are included in cost of goods sold, were $2.7 million and $0.7 million for the three months ended March 31, 2016 and 2015, respectively.

In connection with the Acquisition, TDCC retained liabilities relating to releases of hazardous materials and violations of environmental law to the extent arising prior to the Closing Date.

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.

ENVIRONMENTAL

As is common in our industry, we are subject to environmental laws and regulations related to the use, storage, handling, generation, transportation, emission, discharge, disposal and remediation of, and exposure to, hazardous and non-hazardous substances and wastes in all of the countries in which we do business.

The establishment and implementation of national, state or provincial and local standards to regulate air, water and land quality affect substantially all of our manufacturing locations around the world.  Laws providing for regulation of the manufacture, transportation, use and disposal of hazardous and toxic substances, and remediation of contaminated sites, have imposed additional regulatory requirements on industry, particularly the chemicals industry.  In addition, implementation of environmental laws has required and will continue to require new capital expenditures and will increase plant operating costs.  We employ waste minimization and pollution prevention programs at our manufacturing sites.

In connection with the Acquisition, TDCC retained liabilities relating to releases of hazardous materials and violations of environmental law to the extent arising prior to the Closing Date.

We are party to various governmental and private environmental actions associated with past manufacturing facilities and former waste disposal sites.  Associated costs of investigatory and remedial activities are provided for in accordance with generally accepted accounting principles governing probability and the ability to reasonably estimate future costs.  Our ability to estimate future costs depends on whether our investigatory and remedial activities are in preliminary or advanced stages.  With respect to unasserted claims, we accrue liabilities for costs that, in our experience, we may incur to protect our interests against those unasserted claims.  Our accrued liabilities for unasserted claims amounted to $1.8 million at December 31, 2015.  With respect to asserted claims, we accrue liabilities based on remedial investigation, feasibility study, remedial action and operation, maintenance and monitoring (OM&M) expenses that, in our experience, we may incur in connection with the asserted claims.  Required site OM&M expenses are estimated and accrued in their entirety for required periods not exceeding 30 years, which reasonably approximates the typical duration of long-term site OM&M.

Our liabilities for future environmental expenditures were as follows:

	December 31,
	2015			2014
	($ in millions)
Beginning balance	$	138.3		$	144.6
Charges to income	15.7			9.6
Remedial and investigatory spending	(14.1		)	(14.9		)
Currency translation adjustments	(1.8		)	(1.0		)
Ending balance	$	138.1		$	138.3

At December 31, 2015 and 2014, our consolidated balance sheets included environmental liabilities of $119.1 million and $119.3 million, respectively, which were classified as other noncurrent liabilities.  Our environmental liability amounts do not take into account any discounting of future expenditures or any consideration of insurance recoveries or advances in technology.  These liabilities are reassessed periodically to determine if environmental circumstances have changed and/or remediation efforts and our estimate of related costs have changed.  As a result of these reassessments, future charges to income may be made for additional liabilities.  Of the $138.1 million included on our consolidated balance sheet at December 31, 2015 for future environmental expenditures, we currently expect to utilize $81.1 million of the reserve for future environmental expenditures over the next 5 years, $16.7 million for expenditures 6 to 10 years in the future, and $40.3 million for expenditures beyond 10 years in the future.

Our total estimated environmental liability at December 31, 2015 was attributable to 69 sites, 14 of which were USEPA NPL sites.  Nine sites accounted for 79% of our environmental liability and, of the remaining 60 sites, no one site accounted for more than 3% of our environmental liability.  At four of the nine sites, part of the site is subject to a remedial investigation and another part is in the long-term OM&M stage.  At one of the nine sites, a remedial design is being developed. At one of the nine sites, part of the site is subject to a remedial investigation and another part a remedial design is being developed. At one of these nine sites, a remedial investigation is being performed.  The two remaining sites are in long-term OM&M.  All nine sites are either associated with past manufacturing operations or former waste disposal sites.  None of the nine largest sites represents more than 23% of the liabilities reserved on our consolidated balance sheet at December 31, 2015 for future environmental expenditures.

Charges to income for investigatory and remedial efforts were material to operating results in 2015, 2014 and 2013 and may be material to operating results in future years.

Environmental provisions charged (credited) to income, which are included in cost of goods sold, were as follows:

	Years ended December 31,
	2015		2014			2013
	($ in millions)
Charges to income	$	15.7	$	9.6		$	11.5
Recoveries from third parties of costs incurred and expensed in prior periods	—		(1.4		)	(1.3		)
Total environmental expense	$	15.7	$	8.2		$	10.2

These charges relate primarily to remedial and investigatory activities associated with past manufacturing operations and former waste disposal sites.

Annual environmental-related cash outlays for site investigation and remediation are expected to range between approximately $15 million to $25 million over the next several years, which are expected to be charged against reserves recorded on our consolidated balance sheet.  While we do not anticipate a material increase in the projected annual level of our environmental-related cash outlays for site investigation and remediation, there is always the possibility that such an increase may occur in the future in view of the uncertainties associated with environmental exposures.  Environmental exposures are difficult to assess for numerous reasons, including the identification of new sites, developments at sites resulting from investigatory studies, advances in technology, changes in environmental laws and regulations and their application, changes in regulatory authorities, the scarcity of reliable data pertaining to identified sites, the difficulty in assessing the involvement and financial capability of other PRPs, our ability to obtain contributions from other parties and the lengthy time periods over which site remediation occurs.  It is possible that some of these matters (the outcomes of which are subject to various uncertainties) may be resolved unfavorably to us, which could materially adversely affect our financial position or results of operations.  At December 31, 2015, we estimate that it is reasonably possible that we may have additional contingent environmental liabilities of $60 million in addition to the amounts for which we have already recorded as a reserve.

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COMMITMENTS AND CONTINGENCIES

3 Months Ended

12 Months Ended

Mar. 31, 2016

Dec. 31, 2015

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES

We, and our subsidiaries, are defendants in various legal actions (including proceedings based on alleged exposures to asbestos) incidental to our past and current business activities. As of March 31, 2016, December 31, 2015 and March 31, 2015, our condensed balance sheets included liabilities for these legal actions of $22.1 million, $21.2 million and $22.4 million, respectively. These liabilities do not include costs associated with legal representation. Based on our analysis, and considering the inherent uncertainties associated with litigation, we do not believe that it is reasonably possible that these legal actions will materially adversely affect our financial position, cash flows or results of operations. In connection with the Acquisition, TDCC retained liabilities related to litigation to the extent arising prior to the Closing Date.

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 Accounting Standards Codification (ASC) 450 “Contingencies” (ASC 450) and, therefore, do not record gain contingencies and recognize income until it is earned and realizable.

For the three months ended March 31, 2016, we recognized an insurance recovery of $11.0 million in other operating income (expense) for property damage and business interruption related to a 2008 chlor alkali facility incident.

COMMITMENTS AND CONTINGENCIES

The following table summarizes our contractual commitments under non-cancelable operating leases and purchase contracts as of December 31, 2015:

	Operating Leases		Purchase Commitments
	($ in millions)
2016	$	73.7	$	560.2
2017	60.9		506.4
2018	51.7		449.3
2019	39.5		442.1
2020	27.3		440.3
Thereafter	80.2		2,904.9
Total commitments	$	333.3	$	5,303.2

Our operating lease commitments are primarily for railroad cars but also include distribution, warehousing and office space and data processing and office equipment.  Virtually none of our lease agreements contain escalation clauses or step rent provisions.  Total rent expense charged to operations amounted to $75.1 million, $66.8 million and $64.2 million in 2015, 2014 and 2013, respectively (sublease income is not significant).  The above purchase commitments include raw material, capital expenditure and utility purchasing commitments utilized in our normal course of business for our projected needs.  In connection with the Acquisition, certain additional agreements have been entered into with TDCC, including, long-term purchase agreements for raw materials. These agreements are maintained through long-term cost based contracts that provide us with a reliable supply of key raw materials. Key raw materials received from TDCC include ethylene, propylene and benzene.

We, and our subsidiaries, are defendants in various legal actions (including proceedings based on alleged exposures to asbestos) incidental to our past and current business activities.  At December 31, 2015 and 2014, our consolidated balance sheets included liabilities for these legal actions of $21.2 million and $22.1 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 Acquisition, TDCC retained liabilities related to litigation to the extent arising prior to the Closing Date.

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” (ASC 450) and therefore do not record gain contingencies and recognize income until it is earned and realizable.

For the year ended December 31, 2015 we recognized insurance recoveries of $57.4 million for property damage and business interruption related to the Becancour, Canada and McIntosh, AL chlor alkali facilities. Cost of goods sold was reduced by $10.5 million and selling and administration was reduced by $0.9 million for the reimbursement of costs incurred and expensed in prior periods and other operating income included a gain of $46.0 million. The consolidated statement of cash flows for the year ended December 31, 2015 included $25.8 million for the property damage portion of the insurance recoveries within proceeds from disposition of property, plant and equipment and gains on disposition of property, plant and equipment.

For the year ended December 31, 2013, we recognized $11.0 million as a reduction of cost of goods sold related to a Chlor Alkali Products and Vinyls favorable contract settlement. Also for the year ended December 31, 2013, we recognized $13.9 million as a reduction of selling and administration expense related to the recovery of legacy legal costs.

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DERIVATIVE FINANCIAL INSTRUMENTS

3 Months Ended

12 Months Ended

Mar. 31, 2016

Dec. 31, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

DERIVATIVE FINANCIAL INSTRUMENTS

DERIVATIVE FINANCIAL INSTRUMENTS

We are exposed to market risk in the normal course of our business operations due to our purchases of certain commodities, our ongoing investing and financing activities and our operations that use foreign currencies. The risk of loss can be assessed from the perspective of adverse changes in fair values, cash flows and future earnings. We have established policies and procedures governing our management of market risks and the use of financial instruments to manage exposure to such risks. ASC 815 “Derivatives and Hedging” (ASC 815) requires an entity to recognize all derivatives as either assets or liabilities in the statement of financial position and measure those instruments at fair value. We use hedge accounting treatment for substantially all of our business transactions whose risks are covered using derivative instruments. In accordance with ASC 815, we designate commodity forward contracts as cash flow hedges of forecasted purchases of commodities and 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 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. Those commodity contracts that extend beyond one year correspond with raw material purchases for long-term fixed-price sales contracts.

We enter into forward sales and purchase contracts to manage currency risk resulting from purchase and sale commitments denominated in foreign currencies. At March 31, 2016, we had outstanding forward contracts to buy foreign currency with a notional value of $29.6 million and to sell foreign currency with a notional value of $98.9 million. All of the currency derivatives expire within one year and are for U.S. dollar (USD) equivalents. The counterparties to the forward contracts were 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, 2015, we had outstanding forward contracts to buy foreign currency with a notional value of $21.7 million and to sell foreign currency with a notional value of $10.1 million. At March 31, 2015, we had no forward contracts to buy or sell foreign currencies.

In March 2010, we entered into interest rate swaps on $125 million of our underlying fixed-rate debt obligations, whereby we agreed to pay variable rates to a counterparty who, in turn, pays us fixed rates. The counterparty to these agreements is Citibank, N.A. (Citibank), a major financial institution. In October 2011, we entered into $125 million of interest rate swaps with equal and opposite terms as the $125 million variable interest rate swaps on the 6.75% senior notes due 2016 (2016 Notes). We have agreed to pay a fixed rate to a counterparty who, in turn, pays us variable rates. The counterparty to these agreements is also Citibank. The result was a gain of $11.0 million on the $125 million variable interest rate swaps, which will be recognized through 2016. As of March 31, 2016, $0.6 million of this gain was included in current installments of long-term debt. In October 2011, we de-designated our $125 million interest rate swaps that had previously been designated as fair value hedges. The $125 million variable interest rate swaps and the $125 million fixed interest rate swaps do not meet the criteria for hedge accounting. All changes in the fair value of these interest rate swaps are recorded currently in earnings.

Cash flow hedges

ASC 815 requires that all derivative instruments be recorded on the balance sheet at their fair value. 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 until the hedged item is recognized in earnings. Gains and losses on the derivatives representing hedge ineffectiveness are recognized currently in earnings.

We had the following notional amount of outstanding commodity forward contracts that were entered into to hedge forecasted purchases:

	March 31, 2016		December 31, 2015		March 31, 2015
	($ in millions)
Copper	$	43.1	$	43.6	$	58.3
Zinc	8.5		8.7		5.6
Lead	9.1		9.3		18.5
Natural gas	0.9		2.0		4.3

As of March 31, 2016, the counterparty to $35.0 million of these commodity forward contracts is Wells Fargo Bank, N.A. (Wells Fargo), a major financial institution, and the counterparty to $26.6 million of these commodity forward contracts is Citibank, a major financial institution.

We use cash flow hedges for certain raw material 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 associated with forecasted purchases of raw materials and energy used in the company’s manufacturing process. At March 31, 2016, we had open positions in futures contracts through 2021. If all open futures contracts had been settled on March 31, 2016, we would have recognized a pretax loss of $6.6 million.

If commodity prices were to remain at March 31, 2016 levels, approximately $2.7 million of deferred losses would be reclassified into earnings during the next twelve months. The actual effect on earnings will be dependent on actual commodity prices when the forecasted transactions occur.

Fair value hedges

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. We had no interest rate swaps designated as fair value hedges as of March 31, 2016, December 31, 2015 and March 31, 2015.

In June 2012, we terminated $73.1 million of interest rate swaps with Wells Fargo that had been entered into on the SunBelt Notes in May 2011. The result was a gain of $2.2 million, which will be recognized through 2017. As of March 31, 2016, $0.3 million of this gain was included in long-term debt. Pursuant to a note purchase agreement dated December 22, 1997, the SunBelt Chlor Alkali Partnership (SunBelt) sold $97.5 million of Guaranteed Senior Secured Notes due 2017, Series O, and $97.5 million of Guaranteed Senior Secured Notes due 2017, Series G. We refer to these notes as the SunBelt Notes. The SunBelt Notes bear interest at a rate of 7.23% per annum, payable semi-annually in arrears on each June 22 and December 22.

We use interest rate swaps as a means of managing interest expense and floating interest rate exposure to optimal levels. These interest rate swaps are treated as fair value hedges. The accounting for gains and losses associated with changes in fair value of the derivative and the effect on the condensed financial statements will depend on the hedge designation and whether the hedge is effective in offsetting changes in fair value of cash flows of the asset or liability being hedged.

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:

	Asset Derivatives										Liability Derivatives
		Fair Value										Fair Value
Derivatives Designated as Hedging Instruments	Balance Sheet Location	March 31, 2016			December 31, 2015			March 31, 2015			Balance Sheet Location	March 31, 2016			December 31, 2015			March 31, 2015
		($ in millions)										($ in millions)
Interest rate contracts	Other current assets	$	—		$	—		$	—		Current installments of long-term debt	$	0.6		$	1.2		$	—
Interest rate contracts	Other assets	—			—			—			Long-term debt	0.3			0.4			3.8
Commodity contracts – losses	Other current assets	—			—			—			Accrued liabilities	7.6			11.5			8.1
Commodity contracts – gains	Other current assets	—			—			—			Accrued liabilities	(1.0		)	(0.1		)	(0.5		)
		$	—		$	—		$	—			$	7.5		$	13.0		$	11.4
Derivatives Not Designated as Hedging Instruments
Interest rate contracts – gains	Other current assets	$	0.9		$	1.2		$	—		Accrued liabilities	$	—		$	—		$	—
Interest rate contracts – losses	Other current assets	(0.4		)	(0.1		)	—			Accrued liabilities	—			—			—
Interest rate contracts – gains	Other assets	—			—			3.9			Other liabilities	—			—			—
Interest rate contracts – losses	Other assets	—			—			(1.0		)	Other liabilities	—			—			—
Commodity contracts – losses	Other current assets	—			—			—			Accrued liabilities	0.1			0.2			1.2
Foreign exchange contracts – gains	Other current assets	0.4			0.1			—			Accrued liabilities	(0.3		)	—			—
Foreign exchange contracts – losses	Other current assets	(0.4		)	—			—			Accrued liabilities	1.8			—			—
		$	0.5		$	1.2		$	2.9			$	1.6		$	0.2		$	1.2
Total derivatives(1)		$	0.5		$	1.2		$	2.9			$	9.1		$	13.2		$	12.6

(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 income:

			Amount of Gain (Loss)
			Three Months Ended March 31,
	Location of Gain (Loss)		2016			2015
Derivatives – Cash Flow Hedges		($ in millions)
Recognized in other comprehensive loss (effective portion)	———		$	1.1		$	(2.4	)
Reclassified from accumulated other comprehensive loss into income (effective portion)	Cost of goods sold		$	(3.7	)	$	(1.9	)
Derivatives – Fair Value Hedges
Interest rate contracts	Interest expense		$	0.7		$	0.7
Derivatives Not Designated as Hedging Instruments
Commodity contracts	Cost of goods sold		$	(0.4	)	$	(1.7	)
Foreign exchange contracts	Selling and administration		(3.1		)	—
			$	(3.5	)	$	(1.7	)

The ineffective portion of changes in fair value resulted in zero charged or credited to earnings for the three months ended March 31, 2016 and 2015.

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, exceed 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, 2016 and March 31, 2015, this threshold was not exceeded. As of December 31, 2015, the amount recognized in accrued liabilities for cash collateral provided by us to counterparties was $5.6 million. 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.

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) required an entity to recognize all derivatives as either assets or liabilities in the statement of financial position and measure those instruments at fair value.  We use hedge accounting treatment for substantially all of our business transactions whose risks are covered using derivative instruments.  In accordance with ASC 815, we designate commodity forward contracts as cash flow hedges of forecasted purchases of commodities and 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 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.  Those commodity contracts that extend beyond one year correspond with raw material purchases for long-term fixed-price sales contracts.

We enter into forward sales and purchase contracts to manage currency risk resulting from purchase and sale commitments denominated in foreign currencies. At December 31, 2015 we had outstanding forward contracts to buy foreign currency with a notional value of $21.7 million and to sell foreign currency with a notional value of $10.1 million. All of the currency derivatives expire within one year and are for USD equivalents. The counterparties to the forward contracts were 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, 2014, we had no forward contracts to buy or sell foreign currencies.

In March 2010, we entered into interest rate swaps on $125 million of our underlying fixed-rate debt obligations, whereby we agreed to pay variable rates to a counterparty who, in turn, pays us fixed rates.  The counterparty to these agreements is Citibank.  In October 2011, we entered into $125 million of interest rate swaps with equal and opposite terms as the $125 million variable interest rate swaps on the 2016 Notes.  We have agreed to pay a fixed rate to a counterparty who, in turn, pays us variable rates.  The counterparty to this agreement is also Citibank.  The result was a gain of $11.0 million on the $125 million variable interest rate swaps, which will be recognized through 2016.  As of December 31, 2015, $1.2 million of this gain was included in current installments of long-term debt.  In October 2011, we de-designated our $125 million interest rate swaps that had previously been designated as fair value hedges.  The $125 million variable interest rate swaps and the $125 million fixed interest rate swaps do not meet the criteria for hedge accounting.  All changes in the fair value of these interest rate swaps are recorded currently in earnings.

Cash Flow Hedges

ASC 815 requires that all derivative instruments be recorded on the balance sheet at their fair value.  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 into earnings.  Gains and losses on the derivatives representing hedge ineffectiveness are recognized currently in earnings.

We had the following notional amount of outstanding commodity forward contracts that were entered into to hedge forecasted purchases:

	December 31,
	2015		2014
	($ in millions)
Copper	$	43.6	$	62.7
Zinc	8.7		6.8
Lead	9.3		14.1
Natural gas	2.0		5.7

As of December 31, 2015, the counterparty to $43.3 million of these commodity forward contracts was Wells Fargo, a major financial institution, and the counterparty to $20.3 million of these commodity forward contracts was Citibank, a major financial institution.

We use cash flow hedges for certain raw material 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 associated with forecasted purchases of raw materials and energy used in our manufacturing process.  At December 31, 2015, we had open positions in futures contracts through 2021.  If all open futures contracts had been settled on December 31, 2015, we would have recognized a pretax loss of $11.4 million.

If commodity prices were to remain at December 31, 2015 levels, approximately $5.0 million of deferred losses would be reclassified into earnings during the next twelve months.  The actual effect on earnings will be dependent on actual commodity prices when the forecasted transactions occur.

Fair Value Hedges

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.  We had no interest rate swaps designated as fair value hedges as of December 31, 2015 and 2014.

In June 2012, we terminated $73.1 million of interest rate swaps with Wells Fargo that had been entered into on the SunBelt Notes in May 2011. The result was a gain of $2.2 million which will be recognized through 2017. As of December 31, 2015, $0.4 million of this gain was included in long-term debt.

We use interest rate swaps as a means of managing interest expense and floating interest rate exposure to optimal levels.  These interest rate swaps are treated as fair value hedges.  The accounting for gains and losses associated with changes in fair value of the derivative and the effect on the consolidated financial statements will depend on the hedge designation and whether the hedge is effective in offsetting changes in fair value of cash flows of the asset or liability being hedged.

Financial Statement Impacts

We present our derivative assets and liabilities in our consolidated balance sheets on a net basis whenever we have a legally enforceable master netting agreement with the counterparty to our derivative contracts.  We use these agreements to manage and substantially reduce our potential counterparty credit risk.

The following table summarizes the location and fair value of the derivative instruments on our consolidated balance sheets.  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:

	Asset Derivatives							Liability Derivatives
		Fair Value							Fair Value
		December 31,							December 31,
Derivatives Designated as Hedging Instruments	Balance Sheet Location	2015			2014			Balance Sheet Location	2015			2014
		($ in millions)							($ in millions)
Interest rate contracts	Other current assets	$	—		$	—		Current installments of long-term debt	$	1.2		$	—
Interest rate contracts	Other assets	—			—			Long-term debt	0.4			4.5
Commodity contracts – losses	Other current assets	—			—			Accrued liabilities	11.5			7.2
Commodity contracts – gains	Other current assets	—			—			Accrued liabilities	(0.1		)	(0.1		)
		$	—		$	—			$	13.0		$	11.6
Derivatives Not Designated as Hedging Instruments
Interest rate contracts – gains	Other current assets	$	1.2		$	—		Accrued liabilities	$	—		$	—
Interest rate contracts – losses	Other current assets	(0.1		)	—			Accrued liabilities	—			—
Interest rate contracts – gains	Other assets	—			4.3			Other liabilities	—			—
Interest rate contracts – losses	Other assets	—			(0.8		)	Other liabilities	—			—
Commodity contracts – losses	Other current assets	—			—			Accrued liabilities	0.2			1.5
Foreign exchange contracts – gains	Other current assets	0.1			—			Accrued liabilities	—			—
		$	1.2		$	3.5			$	0.2		$	1.5
Total derivatives(1)		$	1.2		$	3.5			$	13.2		$	13.1

(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 consolidated statements of operations:

		Amount of Gain (Loss)
		Years Ended December 31,
	Location of Gain (Loss)	2015			2014			2013
Derivatives – Cash Flow Hedges		($ in millions)
Recognized in other comprehensive loss (effective portion)	———	$	(13.9	)	$	(10.2	)	$	(7.7	)
Reclassified from accumulated other comprehensive loss into income (effective portion)	Cost of goods sold	$	(9.7	)	$	(1.8	)	$	(1.4	)
Derivatives – Fair Value Hedges
Interest rate contracts	Interest expense	$	2.8		$	2.9		$	2.9
Derivatives Not Designated as Hedging Instruments
Commodity contracts	Cost of goods sold	$	(2.2	)	$	1.4		$	0.4
Foreign exchange contracts	Selling and administration	0.1			—			—
		$	(2.1	)	$	1.4		$	0.4

The ineffective portion of changes in fair value resulted in zero charged or credited to earnings for the years ended December 31, 2015, 2014 and 2013.

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, exceed a specific threshold.  If the threshold is exceeded, cash is either provided by the counterparty to us if the value of the derivatives is our asset, or cash is provided by us to the counterparty if the value of the derivatives is our liability.  As of December 31, 2015, the amount recognized in accrued liabilities for cash collateral provided by us to counterparties was $5.6 million. As of December 31, 2014, 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.

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FAIR VALUE MEASUREMENTS

3 Months Ended

12 Months Ended

Mar. 31, 2016

Dec. 31, 2015

Fair Value Disclosures [Abstract]

FAIR VALUE MEASUREMENTS

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 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, 2016	Level 1		Level 2		Level 3		Total
Assets	($ in millions)
Interest rate swaps	$	—	$	0.5	$	—	$	0.5
Liabilities
Interest rate swaps	$	—	$	0.9	$	—	$	0.9
Commodity forward contracts	—		6.7		—		6.7
Foreign exchange contracts	—		1.5		—		1.5
Balance at December 31, 2015
Assets
Interest rate swaps	$	—	$	1.1	$	—	$	1.1
Foreign exchange contracts	—		0.1		—		0.1
Liabilities
Interest rate swaps	$	—	$	1.6	$	—	$	1.6
Commodity forward contracts	—		11.6		—		11.6
Balance at March 31, 2015
Assets
Interest rate swaps	$	—	$	2.9	$	—	$	2.9
Liabilities
Interest rate swaps	$	—	$	3.8	$	—	$	3.8
Commodity forward contracts	—		8.8		—		8.8

For the three months ended March 31, 2016, there were no transfers into or out of Level 1, Level 2 or Level 3.

Interest Rate Swaps

The fair value of the interest rate swaps was included in other current assets, current installments of long-term debt and long-term debt as of March 31, 2016 and December 31, 2015. The fair value of the interest rate swaps was included in other assets and long-term debt as of March 31, 2015. These 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

The fair value of the commodity forward contracts was classified in accrued liabilities as of March 31, 2016, December 31, 2015 and March 31, 2015, with unrealized gains and losses included in accumulated other comprehensive loss, net of applicable taxes. These 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 forward 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

The fair value of foreign currency contracts was classified within other current assets and accrued liabilities as of March 31, 2016 and December 31, 2015, with gains and losses included in selling and administration expense as these financial instruments do not meet the criteria to qualify for hedge accounting. We had no fair value of foreign currency contracts as of March 31, 2015. 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, restricted cash, 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 on balance sheets
	Level 1		Level 2		Level 3		Total
	($ in millions)
Balance at March 31, 2016	$	—	$	3,778.5	$	153.0	$	3,931.5	$	3,833.0
Balance at December 31, 2015	—		3,826.9		153.0		3,979.9		3,848.8
Balance at March 31, 2015	—		538.7		153.0		691.7		665.1

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, 2016, December 31, 2015 and March 31, 2015.

FAIR VALUE MEASUREMENTS

Assets and liabilities recorded at fair value in the consolidated balance sheets are categorized based upon the level of judgment associated with the inputs used to measure their fair value.  Hierarchical levels are directly related to the amount of subjectivity associated with the inputs to fair valuation of these assets and liabilities.  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.  The following table summarizes the assets and liabilities measured at fair value in the consolidated balance sheets:

Balance at December 31, 2015	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets	($ in millions)
Interest rate swaps	$	—	$	1.1	$	—	$	1.1
Foreign exchange contracts	—		0.1		—		0.1
Liabilities
Interest rate swaps	—		1.6		—		1.6
Commodity forward contracts	—		11.6		—		11.6
Balance at December 31, 2014
Assets
Interest rate swaps	$	—	$	3.5	$	—	$	3.5
Liabilities
Interest rate swaps	—		4.5		—		4.5
Commodity forward contracts	—		8.6		—		8.6

For the year ended December 31, 2015, there were no transfers into or out of Level 1 and Level 2.

The following table summarizes the activity for our earn out liability measured at fair value using Level 3 inputs:

	December 31,
	2015		2014
	($ in millions)
Beginning balance	$	—	$	26.7
Settlements	—		(26.7		)
Ending balance	$	—	$	—

Interest Rate Swaps

The fair value of the interest rate swaps was included in other current assets, current installments of long-term debt and long-term debt as of December 31, 2015.  The fair value of the interest rate swaps was included in other assets and long-term debt as of December 31, 2014.  These 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

The fair value of the commodity forward contracts was classified in accrued liabilities as of December 31, 2015 and 2014, with unrealized gains and losses included in accumulated other comprehensive loss, net of applicable taxes.  These 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 forward contracts for certain raw materials and energy costs such as copper, zinc, lead and natural gas to provide a measure of stability in managing our exposure to price fluctuations.

Foreign Currency Contracts

The fair value of foreign currency contracts was classified within other current assets as of December 31, 2015, with gains and losses included in selling and administration expense as these financial instruments do not meet the criteria to qualify for hedge accounting. We had no fair value of foreign currency contracts as of December 31, 2014.  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, restricted cash, 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 balance sheets:

	Fair Value Measurements
	Level 1		Level 2		Level 3		Total		Amount recorded on balance sheets
	($ in millions)
Balance at December 31, 2015	$	—	$	3,826.9	$	153.0	$	3,979.9	$	3,848.8
Balance at December 31, 2014	—		531.9		153.0		684.9		666.2

Earn Out

On February 11, 2011 we acquired PolyOne’s 50% interest in SunBelt. With this acquisition, we agreed to a three-year earn out, which had no guaranteed minimum or maximum, based on the performance of SunBelt. The fair value of the earn out was estimated using a probability-weighted discounted cash flow model.  This fair value measurement was based on significant inputs not observed in the market.  Key assumptions in determining the fair value of the earn out included the discount rate and cash flow projections. The final earn out payment was made in 2014.

For the year ended December 31, 2014, we paid $26.7 million for the earn out related to the 2013 SunBelt performance. The earn out payment for 2014 included $14.8 million that was recognized as part of the original purchase price. The $14.8 million is included as a financing activity in the statement of cash flows.

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 December 31, 2015 and 2014.

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OTHER FINANCIAL DATA

12 Months Ended

Dec. 31, 2015

Quarterly Financial Data [Abstract]

OTHER FINANCIAL DATA

OTHER FINANCIAL DATA

Quarterly Data (Unaudited)

($ in millions, except per share data)

2015	First Quarter		Second Quarter		Third Quarter		Fourth Quarter			Year
Sales	$	518.0	$	535.4	$	533.6	$	1,267.4		$	2,854.4
Cost of goods sold	433.2		445.5		460.0		1,148.1			2,486.8
Net income (loss)	13.1		42.3		5.9		(62.7		)	(1.4		)
Net income (loss) per common share:
Basic	0.17		0.55		0.08		(0.39		)	(0.01		)
Diluted	0.17		0.54		0.08		(0.39		)	(0.01		)
Common dividends per share	0.20		0.20		0.20		0.20			0.80
Market price of common stock(1)
High	34.34		32.56		27.18		22.13			34.34
Low	22.00		26.77		15.73		16.60			15.73

2014	First Quarter		Second Quarter		Third Quarter		Fourth Quarter		Year
Sales	$	577.4	$	570.4	$	593.6	$	499.8	$	2,241.2
Cost of goods sold	475.4		463.6		492.3		421.9		1,853.2
Income from continuing operations	29.5		36.6		26.1		12.8		105.0
Income from discontinued operations, net	—		0.7		—		—		0.7
Net income	29.5		37.3		26.1		12.8		105.7
Basic income per common share:
Income from continuing operations	0.37		0.46		0.33		0.16		1.33
Income from discontinued operations, net	—		0.01		—		—		0.01
Net income	0.37		0.47		0.33		0.16		1.34
Diluted income per common share:
Income from continuing operations	0.37		0.46		0.33		0.16		1.32
Income from discontinued operations, net	—		0.01		—		—		0.01
Net income	0.37		0.47		0.33		0.16		1.33
Common dividends per share	0.20		0.20		0.20		0.20		0.80
Market price of common stock(1)
High	29.18		29.28		28.08		25.97		29.28
Low	24.51		26.42		25.23		20.43		20.43

(1) NYSE composite transactions.

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SUPPLEMENTAL GUARANTOR FINANCIAL INFORMATION

3 Months Ended

12 Months Ended

Mar. 31, 2016

Dec. 31, 2015

Supplemental Guarantor Financial Information [Abstract]

Supplemental Guarantor Financial Information

Supplemental Guarantor Financial Information

The following condensed consolidating guarantor financial information is presented to comply with the requirements of Rule 3-10 of Regulation S-X.

In October 2015, Spinco (the Issuer) issued $720.0 million aggregate principal amount of the 2023 Notes and $500.0 million aggregate principal amount of the 2025 Notes (collectively, the Notes). The Issuer was formed on March 13, 2015 as a wholly owned subsidiary of TDCC 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, 2016, December 31, 2015 and March 31, 2015, and the related condensed consolidating statements of operations, comprehensive income and cash flows for the three months ended March 31, 2016 and March 31, 2015, 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, 2016
(In millions)
(Unaudited)
	Parent Guarantor			Issuer		Subsidiary Non-Guarantor			Eliminations			Total
Assets
Current assets:
Cash and cash equivalents	$	19.8		$	—	$	295.8		$	—		$	315.6
Receivables, net	119.3			—		693.9			—			813.2
Intercompany receivables	—					1,498.9			(1,498.9		)	—
Income taxes receivable	35.3			—		1.0			—			36.3
Inventories	173.3			—		506.2			—			679.5
Current deferred income taxes	—			—		2.6			(2.6		)	—
Other current assets	150.7			5.0		6.2			(129.1		)	32.8
Total current assets	498.4			5.0		3,004.6			(1,630.6		)	1,877.4
Property, plant and equipment, net	501.4			—		3,357.6			—			3,859.0
Investment in Subsidiaries	5,970.8			3,675.2		—			(9,646.0		)	—
Deferred income taxes	170.8			—		—			(63.4		)	107.4
Other assets	42.8			—		421.0			—			463.8
Long-term receivables—affiliates	—			2,553.2		—			(2,553.2		)
Intangible assets, net	0.1			—		663.1			—			663.2
Goodwill	—			985.4		1,160.7			—			2,146.1
Total assets	$	7,184.3		$	7,218.8	$	8,607.0		$	(13,893.2	)	$	9,116.9
Liabilities and Shareholders' Equity
Current liabilities:
Current installments of long-term debt	$	192.9		$	—	$	12.2		$	—		$	205.1
Accounts payable	45.9			—		432.2			—			478.1
Intercompany payables	1,459.5			39.4		—			(1,498.9		)	—
Income taxes payable	2.5			—		14.2			(2.6		)	14.1
Accrued liabilities	267.8			—		213.6			(129.1		)	352.3
Total current liabilities	1,968.6			39.4		672.2			(1,630.6		)	1,049.6
Long-term debt	1,067.7			2,547.8		12.4			—			3,627.9
Accrued pension liability	182.4			—		452.8			—			635.2
Deferred income taxes	8.6			189.7		892.7			—			1,091.0
Long-term payables—affiliates	1,291.8			281.7		979.7			(2,553.2		)	—
Other liabilities	292.4			—		111.4			(63.4		)	340.4
Total liabilities	4,811.5			3,058.6		3,121.2			(4,247.2		)	6,744.1
Commitments and contingencies
Shareholders' equity:
Common stock	165.2			—		14.6			(14.6		)	165.2
Additional paid-in capital	2,238.9			4,146.1		4,790.3			(8,936.4		)	2,238.9
Accumulated other comprehensive loss	(470.2		)	—		(7.2		)	7.2			(470.2		)
Retained earnings	438.9			14.1		688.1			(702.2		)	438.9
Total shareholders' equity	2,372.8			4,160.2		5,485.8			(9,646.0		)	2,372.8
Total liabilities and shareholders' equity	$	7,184.3		$	7,218.8	$	8,607.0		$	(13,893.2	)	$	9,116.9

CONDENSED CONSOLIDATING BALANCE SHEETS
December 31, 2015
(In millions)
	Parent Guarantor			Issuer			Subsidiary Non-Guarantor			Eliminations			Total
Assets
Current assets:
Cash and cash equivalents	$	119.4		$	—		$	272.6		$	—		$	392.0
Receivables, net	107.7			—			679.4			(3.7		)	783.4
Intercompany receivables	—			—			995.0			(995.0		)	—
Income taxes receivable	34.6			—			1.5			(3.2		)	32.9
Inventories	166.0			—			519.2			—			685.2
Current deferred income taxes	—			—			2.7			(2.7		)
Other current assets	152.1			5.0			4.6			(121.8		)	39.9
Total current assets	579.8			5.0			2,475.0			(1,126.4		)	1,933.4
Property, plant and equipment, net	508.7			—			3,444.7			—			3,953.4
Investment in Subsidiaries	5,905.0			3,636.3			—			(9,541.3		)	—
Deferred income taxes	—			—			104.6			(8.7		)	95.9
Other assets	43.5			—			411.1			—			454.6
Long-term receivables—affiliates	—			2,562.6			—			(2,562.6		)	—
Intangible assets, net	0.5			—			677.0			—			677.5
Goodwill	—			990.2			1,183.9			—			2,174.1
Total assets	$	7,037.5		$	7,194.1		$	8,296.3		$	(13,239.0	)	$	9,288.9
Liabilities and Shareholders' Equity
Current liabilities:
Current installments of long-term debt	$	192.8		$	—		$	12.2		$	—		$	205.0
Accounts payable	36.1			—			576.6			(4.5		)	608.2
Intercompany payables	966.0			29.0			—			(995.0		)	—
Income taxes payable	2.7			—			8.1			(5.9		)	4.9
Accrued liabilities	227.8			—			221.3			(121.0		)	328.1
Total current liabilities	1,425.4			29.0			818.2			(1,126.4		)	1,146.2
Long-term debt	1,084.0			2,547.4			12.4			—			3,643.8
Accrued pension liability	484.3			—			164.6			—			648.9
Deferred income taxes	32.5			189.7			881.7			(8.7		)	1,095.2
Long-term payables—affiliates	1,296.4			286.5			979.7			(2,562.6		)	—
Other liabilities	296.1			—			39.9			—			336.0
Total liabilities	4,618.7			3,052.6			2,896.5			(3,697.7		)	6,870.1
Commitments and contingencies
Shareholders' equity:
Common stock	165.1			—			14.6			(14.6		)	165.1
Additional paid-in capital	2,236.4			4,146.1			4,789.6			(8,935.7		)	2,236.4
Accumulated other comprehensive loss	(492.5		)	—			(31.7		)	31.7			(492.5		)
Retained earnings	509.8			(4.6		)	627.3			(622.7		)	509.8
Total shareholders' equity	2,418.8			4,141.5			5,399.8			(9,541.3		)	2,418.8
Total liabilities and shareholders' equity	$	7,037.5		$	7,194.1		$	8,296.3		$	(13,239.0	)	$	9,288.9

CONDENSED CONSOLIDATING BALANCE SHEETS
March 31, 2015
(In millions)
(Unaudited)
	Parent Guarantor			Issuer		Subsidiary Non-Guarantor			Eliminations			Total
Assets
Current assets:
Cash and cash equivalents	$	179.2		$	—	$	17.6		$	—		$	196.8
Receivables, net	130.0			—		173.8			—			303.8
Intercompany receivables	—			—		622.7			(622.7		)	—
Income taxes receivable	15.1			—		—			—			15.1
Inventories	149.1			—		67.0			—			216.1
Current deferred income taxes	42.6			—		11.4			—			54.0
Other current assets	111.9			—		2.2			(96.7		)	17.4
Total current assets	627.9			—		894.7			(719.4		)	803.2
Property, plant and equipment, net	503.7			—		416.2			—			919.9
Investment in Subsidiaries	1,694.2			—		—			(1,694.2		)	—
Deferred income taxes	64.1			—		—			(51.2		)	12.9
Other assets	60.1			—		10.1			—			70.2
Intangible assets, net	0.5			—		119.3			—			119.8
Goodwill	—			—		747.1			—			747.1
Total assets	$	2,950.5		$	—	$	2,187.4		$	(2,464.8	)	$	2,673.1
Liabilities and Shareholders' Equity
Current liabilities:
Current installments of long-term debt	$	4.2		$	—	$	12.2		$	—		$	16.4
Accounts payable	60.7			—		87.7			(0.6		)	147.8
Intercompany payables	622.7					—			(622.7		)	—
Income taxes payable	1.1			—		—			—			1.1
Accrued liabilities	135.5			—		165.7			(96.1		)	205.1
Total current liabilities	824.2			—		265.6			(719.4		)	370.4
Long-term debt	623.9			—		24.8			—			648.7
Accrued pension liability	165.0			—		2.2			—			167.2
Deferred income taxes	—			—		158.5			(51.2		)	107.3
Other liabilities	319.2			—		42.1			—			361.3
Total liabilities	1,932.3			—		493.2			(770.6		)	1,654.9
Commitments and contingencies
Shareholders' equity:
Common stock	77.5			—		14.6			(14.6		)	77.5
Additional paid-in capital	792.1			—		1,221.3			(1,221.3		)	792.1
Accumulated other comprehensive loss	(439.7		)	—		(20.1		)	20.1			(439.7		)
Retained earnings	588.3			—		478.4			(478.4		)	588.3
Total shareholders' equity	1,018.2			—		1,694.2			(1,694.2		)	1,018.2
Total liabilities and shareholders' equity	$	2,950.5		$	—	$	2,187.4		$	(2,464.8	)	$	2,673.1

CONDENSED CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS
Three Months Ended March 31, 2016
(In millions)
(Unaudited)
	Parent Guarantor			Issuer			Subsidiary Non-Guarantor			Eliminations			Total
Sales	$	320.7		$	—		$	1,141.3		$	(113.8	)	$	1,348.2
Operating expenses:
Cost of goods sold	275.3			—			1,013.9			(113.8		)	1,175.4
Selling and administration	36.8			—			51.3			—			88.1
Restructuring charges	0.3			—			92.5			—			92.8
Acquisition-related costs	10.2			—			—			—			10.2
Other operating (loss) income	(0.5		)	—			11.4			—			10.9
Operating (loss) income	(2.4		)	—			(5.0		)	—			(7.4		)
Earnings of non-consolidated affiliates	0.2			—			—			—			0.2
Equity income (loss) in subsidiaries	(28.8		)	43.6			—			(14.8		)	—
Interest expense	10.7			38.2			1.0			(1.4		)	48.5
Interest income	0.8			—			0.9			(1.4		)	0.3
Income (loss) before taxes	(40.9		)	5.4			(5.1		)	(14.8		)	(55.4		)
Income tax (benefit) provision	(3.0		)	(13.3		)	(1.2		)	—			(17.5		)
Net income (loss)	$	(37.9	)	$	18.7		$	(3.9	)	$	(14.8	)	$	(37.9	)

CONDENSED CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS
Three Months Ended March 31, 2015
(In millions)
(Unaudited)
	Parent Guarantor			Issuer		Subsidiary Non-Guarantor		Eliminations			Total
Sales	$	323.1		$	—	$	289.4	$	(94.5	)	$	518.0
Operating expenses:
Cost of goods sold	274.7			—		253.0		(94.5		)	433.2
Selling and administration	35.3			—		11.7		—			47.0
Restructuring charges	—			—		1.2		—			1.2
Acquisition-related costs	10.4			—		—		—			10.4
Other operating (loss) income	(0.6		)	—		0.4		—			(0.2		)
Operating income	2.1			—		23.9		—			26.0
Earnings of non-consolidated affiliates	0.4			—		—		—			0.4
Equity income (loss) in subsidiaries	15.1			—		—		(15.1		)	—
Interest expense	7.9			—		0.5		(1.3		)	7.1
Interest income	0.8			—		0.8		(1.3		)	0.3
Income (loss) before taxes	10.5			—		24.2		(15.1		)	19.6
Income tax provision	(2.6		)	—		9.1		—			6.5
Net income (loss)	$	13.1		$	—	$	15.1	$	(15.1	)	$	13.1

CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME
Three Months Ended March 31, 2016
(In millions)
(Unaudited)
	Parent Guarantor			Issuer		Subsidiary Non-Guarantor			Eliminations			Total
Net income (loss)	$	(37.9	)	$	18.7	$	(3.9	)	$	(14.8	)	$	(37.9	)
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments, net	15.5			—		15.5			(15.5		)	15.5
Unrealized losses on derivative contracts, net	3.0			—		—			—			3.0
Amortization of prior service costs and actuarial losses, net	3.8			—		0.5			(0.5		)	3.8
Total other comprehensive income (loss), net of tax	22.3			—		16.0			(16.0		)	22.3
Comprehensive income (loss)	$	(15.6	)	$	18.7	$	12.1		$	(30.8	)	$	(15.6	)

CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME
Three Months Ended March 31, 2015
(In millions)
(Unaudited)
	Parent Guarantor			Issuer		Subsidiary Non-Guarantor			Eliminations			Total
Net (loss) income	$	13.1		$	—	$	15.1		$	(15.1	)	$	13.1
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments, net	(1.4		)	—		(1.4		)	1.4			(1.4		)
Unrealized losses on derivative contracts, net	(0.3		)	—		—			—			(0.3		)
Amortization of prior service costs and actuarial losses, net	5.1			—		0.4			(0.4		)	5.1
Total other comprehensive (loss) income, net of tax	3.4			—		(1.0		)	1.0			3.4
Comprehensive (loss) income	$	16.5		$	—	$	14.1		$	(14.1	)	$	16.5

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS
Three Months Ended March 31, 2016
(In millions)
(Unaudited)
	Parent Guarantor			Issuer		Subsidiary Non-Guarantor			Eliminations	Total
Net operating activities	$	(35.5	)	—		$	82.5		—	$	47.0
Investing Activities
Capital expenditures	(16.2		)	—		(59.9		)	—	(76.1		)
Proceeds from disposition of property, plant and equipment	—			—		0.1			—	0.1
Distributions from affiliated companies, net	2.2			—		—			—	2.2
Net investing activities	(14.0		)	—		(59.8		)	—	(73.8		)
Financing Activities
Long-term debt repayments	(0.2		)	(16.9	)	—			—	(17.1		)
Dividends paid	(33.0		)	—		—			—	(33.0		)
Intercompany financing activities	(16.9		)	16.9		—			—	—
Net financing activities	(50.1		)	—		—			—	(50.1		)
Effect of exchange rate changes on cash and cash equivalents	—			—		0.5			—	0.5
Net (decrease) increase in cash and cash equivalents	(99.6		)	—		23.2			—	(76.4		)
Cash and cash equivalents, beginning of year	119.4			—		272.6			—	392.0
Cash and cash equivalents, end of year	$	19.8		—		$	295.8		—	$	315.6

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS
Three Months Ended March 31, 2015
(In millions)
(Unaudited)
	Parent Guarantor			Issuer		Subsidiary Non-Guarantor			Eliminations		Total
Net operating activities	$	(15.5	)	$	—	$	5.9		$	—	$	(9.6	)
Investing Activities
Capital expenditures	(18.6		)	—		(4.7		)	—		(23.3		)
Proceeds from disposition of property, plant and equipment	0.2			—		0.4			—		0.6
Distributions from affiliated companies, net	2.2			—		—			—		2.2
Other investing activities	—			—		(1.4		)	—		(1.4		)
Net investing activities	(16.2		)	—		(5.7		)	—		(21.9		)
Financing Activities
Long-term debt repayments	(1.0		)	—		—			—		(1.0		)
Stock options exercised	2.0			—		—			—		2.0
Excess tax benefits from stock-based compensation	0.3			—		—			—		0.3
Dividends paid	(15.5		)	—		—			—		(15.5		)
Debt and equity issuance costs	(14.3		)	—		—			—		(14.3		)
Net financing activities	(28.5		)	—		—			—		(28.5		)
Net (decrease) increase in cash and cash equivalents	(60.2		)	—		0.2			—		(60.0		)
Cash and cash equivalents, beginning of year	239.4			—		17.4			—		256.8
Cash and cash equivalents, end of year	$	179.2		$	—	$	17.6		$	—	$	196.8

Supplemental Guarantor Financial Information

The following condensed consolidating guarantor financial information is presented to comply with the requirements of Rule 3-10 of Regulation S-X.

In October 2015, Spinco (the Issuer) issued $720.0 million aggregate principal amount of the 2023 Notes and $500.0 million aggregate principal amount of the 2025 Notes (collectively, the Notes). The Issuer was formed on March 13, 2015 as a wholly owned subsidiary of TDCC 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 December 31, 2015 and 2014, and the related condensed consolidating statements of operations, comprehensive income and cash flows for each of the years in the three-year period ended December 31, 2015 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.

In April 2015, the FASB issued ASU 2015-03 “Simplifying the Presentation of Debt Issuance Costs” (ASU 2015-03) and, in August 2015, the FASB issued ASU 2015-15 “Interest-Imputation of Interest” (ASU 2015-15), which both amend ASC 835-30 “Interest-Imputation of Interest.” These updates require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability while debt issuance costs related to line-of-credit arrangements will continue to be presented as an asset. We adopted ASU 2015-03 and ASU 2015-15 on January 1, 2016 which required retrospective application. Historical balance sheet amounts have been adjusted to reflect the adoption of the updates requiring debt issuance costs to be presented as a direct reduction from the carrying value of the related debt.

CONDENSED CONSOLIDATING BALANCE SHEETS
December 31, 2015
(In millions)
	Parent Guarantor		Issuer		Subsidiary Non-Guarantor		Eliminations			Total
Assets
Current assets:
Cash and cash equivalents	$	119.4	$	—	$	272.6	$	—		$	392.0
Receivables, net	107.7		—		679.4		(3.7		)	783.4
Intercompany receivables	—		—		995.0		(995.0		)	—
Income taxes receivable	34.6		—		1.5		(3.2		)	32.9
Inventories	166.0		—		519.2		—			685.2
Current deferred income taxes	—		—		2.7		(2.7		)
Other current assets	152.1		5.0		4.6		(121.8		)	39.9
Total current assets	579.8		5.0		2,475.0		(1,126.4		)	1,933.4
Property, plant and equipment, net	508.7		—		3,444.7		—			3,953.4
Investment in Subsidiaries	5,905.0		3,636.3		—		(9,541.3		)	—
Deferred income taxes	—		—		104.6		(8.7		)	95.9
Other assets	43.5		—		411.1		—			454.6
Long-term receivables—affiliates	—		2,562.6		—		(2,562.6		)	—
Intangible assets, net	0.5		—		677.0		—			677.5
Goodwill	—		990.2		1,183.9		—			2,174.1
Total assets	$	7,037.5	$	7,194.1	$	8,296.3	$	(13,239.0	)	$	9,288.9
Liabilities and Shareholders' Equity
Current liabilities:
Current installments of long-term debt	$	192.8	$	—	$	12.2	$	—		$	205.0
Accounts payable	36.1		—		576.6		(4.5		)	608.2
Intercompany payables	966.0		29.0		—		(995.0		)	—
Income taxes payable	2.7		—		8.1		(5.9		)	4.9
Accrued liabilities	227.8		—		221.3		(121.0		)	328.1
Total current liabilities	1,425.4		29.0		818.2		(1,126.4		)	1,146.2
Long-term debt	1,084.0		2,547.4		12.4		—			3,643.8
Accrued pension liability	484.3		—		164.6		—			648.9
Deferred income taxes	32.5		189.7		881.7		(8.7		)	1,095.2
Long-term payables—affiliates	1,296.4		286.5		979.7		(2,562.6		)	—

Other liabilities	296.1			—			39.9			—			336.0
Total liabilities	4,618.7			3,052.6			2,896.5			(3,697.7		)	6,870.1
Commitments and contingencies
Shareholders' equity:
Common stock	165.1			—			14.6			(14.6		)	165.1
Additional paid-in capital	2,236.4			4,146.1			4,789.6			(8,935.7		)	2,236.4
Accumulated other comprehensive loss	(492.5		)	—			(31.7		)	31.7			(492.5		)
Retained earnings	509.8			(4.6		)	627.3			(622.7		)	509.8
Total shareholders' equity	2,418.8			4,141.5			5,399.8			(9,541.3		)	2,418.8
Total liabilities and shareholders' equity	$	7,037.5		$	7,194.1		$	8,296.3		$	(13,239.0	)	$	9,288.9

CONDENSED CONSOLIDATING BALANCE SHEETS
December 31, 2014
(In millions)
	Parent Guarantor			Issuer		Subsidiary Non-Guarantor			Eliminations			Total
Assets
Current assets:
Cash and cash equivalents	$	239.4		$	—	$	17.4		$	—		$	256.8
Receivables, net	107.3			—		155.8			—			263.1
Intercompany receivables	—					617.1			(617.1		)	—
Income taxes receivable	21.4			—		0.2			—			21.6
Inventories	136.1			—		74.0			—			210.1
Current deferred income taxes	41.9			—		12.3			—			54.2
Other current assets	99.0			—		1.9			(90.6		)	10.3
Total current assets	645.1			—		878.7			(707.7		)	816.1
Property, plant and equipment, net	505.3			—		425.7			—			931.0
Investment in Subsidiaries	1,683.9			—		—			(1,683.9		)	—
Deferred income taxes	61.2			—		—			(48.7		)	12.5
Other assets	48.4			—		10.6			—			59.0
Intangible assets, net	0.5			—		123.0			—			123.5
Goodwill	—			—		747.1			—			747.1
Total assets	$	2,944.4		$	—	$	2,185.1		$	(2,440.3	)	$	2,689.2
Liabilities and Shareholders' Equity
Current liabilities:
Current installments of long-term debt	$	4.2		$	—	$	12.2		$	—		$	16.4
Accounts payable	54.0			—		93.4			(0.6		)	146.8
Intercompany payables	617.1					—			(617.1		)	—
Income taxes payable	0.2			—		—			—			0.2
Accrued liabilities	137.0			—		167.3			(90.0		)	214.3
Total current liabilities	812.5			—		272.9			(707.7		)	377.7
Long-term debt	624.9			—		24.9			—			649.8
Accrued pension liability	179.1			—		2.9			—			182.0
Deferred income taxes	—			—		155.8			(48.7		)	107.1
Other liabilities	314.6			—		44.7			—			359.3
Total liabilities	1,931.1			—		501.2			(756.4		)	1,675.9
Commitments and contingencies
Shareholders' equity:
Common stock	77.4			—		14.6			(14.6		)	77.4
Additional paid-in capital	788.3			—		1,221.2			(1,221.2		)	788.3
Accumulated other comprehensive loss	(443.1		)	—		(19.0		)	19.0			(443.1		)
Retained earnings	590.7			—		467.1			(467.1		)	590.7
Total shareholders' equity	1,013.3			—		1,683.9			(1,683.9		)	1,013.3
Total liabilities and shareholders' equity	$	2,944.4		$	—	$	2,185.1		$	(2,440.3	)	$	2,689.2

CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS
Year Ended December 31, 2015
(In millions)
	Parent Guarantor			Issuer			Subsidiary Non-Guarantor			Eliminations			Total
Sales	$	1,215.4		$	—		$	2,002.5		$	(363.5	)	$	2,854.4
Operating expenses:
Cost of goods sold	1,057.8			—			1,792.5			(363.5		)	2,486.8
Selling and administration	110.4			—			76.1			—			186.5
Restructuring charges	0.7			—			2.0			—			2.7
Acquisition-related costs	117.9			—			5.5			—			123.4
Other operating (loss) income	(4.0		)	—			49.7			—			45.7
Operating (loss) income	(75.4		)	—			176.1			—			100.7
Earnings of non-consolidated affiliates	1.7			—			—			—			1.7
Equity income (loss) in subsidiaries	90.2			19.7			—			(109.9		)	—
Interest expense	60.9			37.0			4.5			(5.4		)	97.0
Interest income	3.1			—			3.4			(5.4		)	1.1
Other income (expense)	0.4			—			(0.2		)	—			0.2
Income (loss) before taxes	(40.9		)	(17.3		)	174.8			(109.9		)	6.7
Income tax provision (benefit)	(39.5		)	(12.8		)	60.3			—			8.1
Net income (loss)	$	(1.4	)	$	(4.6	)	$	114.5		$	(109.9	)	$	(1.4	)

CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS
Year Ended December 31, 2014
(In millions)
	Parent Guarantor		Issuer		Subsidiary Non-Guarantor		Eliminations			Total
Sales	$	1,373.2	$	—	$	1,285.5	$	(417.5	)	$	2,241.2
Operating expenses:					—
Cost of goods sold	1,148.1		—		1,122.6		(417.5		)	1,853.2
Selling and administration	90.8		—		75.4		—			166.2
Restructuring charges	4.8		—		10.9		—			15.7
Acquisition-related costs	4.2		—		—		—			4.2
Other operating income	0.9		—		0.6		—			1.5
Operating income	126.2		—		77.2		—			203.4
Earnings of non-consolidated affiliates	1.7		—		—		—			1.7
Equity income (loss) in subsidiaries	48.8		—		—		(48.8		)	—
Interest expense	47.0		—		1.3		(4.5		)	43.8
Interest income	2.5		—		3.3		(4.5		)	1.3
Other income	0.1		—		—		—			0.1
Income (loss) from continuing operations before taxes	132.3		—		79.2		(48.8		)	162.7
Income tax provision	27.3		—		30.4		—			57.7
Income (loss) from continuing operations	105.0		—		48.8		(48.8		)	105.0
Income from discontinued operations, net	0.7		—		—		—			0.7
Net income (loss)	$	105.7	$	—	$	48.8	$	(48.8	)	$	105.7

CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS
Year Ended December 31, 2013
(In millions)
	Parent Guarantor			Issuer		Subsidiary Non-Guarantor			Eliminations			Total
Sales	$	1,379.4		$	—	$	1,569.6		$	(434.0	)	$	2,515.0
Operating expenses:						—
Cost of goods sold	1,159.3			—		1,308.4			(434.0		)	2,033.7
Selling and administration	132.8			—		57.2			—			190.0
Restructuring charges	5.5			—		—			—			5.5
Acquisition-related costs	—			—		—			—			—
Other operating income	0.6			—		0.1			—			0.7
Operating income	82.4			—		204.1			—			286.5
Earnings of non-consolidated affiliates	2.8			—		—			—			2.8
Equity income (loss) in subsidiaries	129.8			—		—			(129.8		)	—
Interest expense	37.8			—		7.9			(7.1		)	38.6
Interest income	4.4			—		3.3			(7.1		)	0.6
Other (expense) income	(0.1		)	—		(1.2		)	—			(1.3		)
Income (loss) before taxes	181.5			—		198.3			(129.8		)	250.0
Income tax provision	2.9			—		68.5			—			71.4
Net income (loss)	$	178.6		$	—	$	129.8		$	(129.8	)	$	178.6

CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME
Year Ended December 31, 2015
(In millions)
	Parent Guarantor			Issuer			Subsidiary Non-Guarantor			Eliminations			Total
Net income (loss)	$	(1.4	)	$	(4.6	)	$	114.5		$	(109.9	)	$	(1.4	)
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments, net	(9.8		)	—			(9.8		)	9.8			(9.8		)
Unrealized losses on derivative contracts, net	(2.7		)	—			—			—			(2.7		)
Pension and postretirement liability adjustments, net	(78.8		)	—			(5.1		)	5.1			(78.8		)
Amortization of prior service costs and actuarial losses, net	41.9			—			2.3			(2.3		)	41.9
Total other comprehensive (loss) income, net of tax	(49.4		)	—			(12.6		)	12.6			(49.4		)
Comprehensive (loss) income	$	(50.8	)	$	(4.6	)	$	101.9		$	(97.3	)	$	(50.8	)

CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME
Year Ended December 31, 2014
(In millions)
	Parent Guarantor			Issuer		Subsidiary Non-Guarantor			Eliminations			Total
Net income (loss)	$	105.7		$	—	$	48.8		$	(48.8	)	$	105.7
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments, net	(1.8		)	—		(1.8		)	1.8			(1.8		)
Unrealized losses on derivative contracts, net	(5.1		)	—		—			—			(5.1		)
Pension and postretirement liability adjustments, net	(86.6		)	—		(3.2		)	3.2			(86.6		)
Amortization of prior service costs and actuarial losses, net	15.5			—		1.4			(1.4		)	15.5
Total other comprehensive (loss) income, net of tax	(78.0		)	—		(3.6		)	3.6			(78.0		)
Comprehensive income (loss)	$	27.7		$	—	$	45.2		$	(45.2	)	$	27.7

CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME
Year Ended December 31, 2013
(In millions)
	Parent Guarantor			Issuer		Subsidiary Non-Guarantor			Eliminations			Total
Net income (loss)	$	178.6		$	—	$	129.8		$	(129.8	)	$	178.6
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net	(2.6		)	—		(2.6		)	2.6			(2.6		)
Unrealized losses on derivative contracts, net	(3.8		)	—		—			—			(3.8		)
Pension and postretirement liability adjustments, net	(7.7		)	—		(1.4		)	1.4			(7.7		)
Amortization of prior service costs and actuarial losses, net	20.3			—		1.1			(1.1		)	20.3
Total other comprehensive income (loss), net of tax	6.2			—		(2.9		)	2.9			6.2
Comprehensive income (loss)	$	184.8		$	—	$	126.9		$	(126.9	)	$	184.8

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS
Year Ended December 31, 2015
(In millions)
	Parent Guarantor			Issuer			Subsidiary Non-Guarantor			Eliminations		Total
Net operating activities	$	(70.6	)	$	—		$	287.7		$	—	$	217.1
Investing Activities
Capital expenditures	(74.0		)	—			(56.9		)	—		(130.9		)
Business acquired and related transactions, net of cash acquired	(408.1		)	—			—			—		(408.1		)
Proceeds from disposition of property, plant and equipment	1.7			—			24.5			—		26.2
Distributions from affiliated companies, net	8.8			—			—			—		8.8
Net investing activities	(471.6		)	—			(32.4		)	—		(504.0		)
Financing Activities
Long-term debt:
Borrowings	1,275.0			—			—			—		1,275.0
Repayments	(149.5		)	—			(581.2		)	—		(730.7		)
Stock options exercised	2.2			—			—			—		2.2
Excess tax benefits from stock-based compensation	0.4			—			—			—		0.4
Dividends paid	(79.5		)	—			—			—		(79.5		)
Debt and equity issuance costs	(35.2		)	(10.0		)	—			—		(45.2		)
Intercompany financing activities	(591.2		)	10.0			581.2					—
Net financing activities	422.2			—			—			—		422.2
Effect of exchange rate changes on cash and cash equivalents	—			—			(0.1		)	—		(0.1		)
Net (decrease) increase in cash and cash equivalents	(120.0		)	—			255.2			—		135.2
Cash and cash equivalents, beginning of year	239.4			—			17.4			—		256.8
Cash and cash equivalents, end of year	$	119.4		$	—		$	272.6		$	—	$	392.0

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS
Year Ended December 31, 2014
(In millions)
	Parent Guarantor			Issuer		Subsidiary Non-Guarantor			Eliminations		Total
Net operating activities	$	134.7		$	—	$	24.5		$	—	$	159.2
Investing Activities
Capital expenditures	(51.3		)	—		(20.5		)	—		(71.8		)
Proceeds from disposition of property, plant and equipment	3.5			—		2.1			—		5.6
Restricted cash activity, net	4.2			—		—			—		4.2
Other investing activities	—			—		0.3			—		0.3
Net investing activities	(43.6		)	—		(18.1		)	—		(61.7		)
Financing Activities
Long-term debt:
Borrowings	150.0			—		—			—		150.0
Repayments	(150.2		)	—		(12.2		)	—		(162.4		)
Earn out payment - SunBelt	—			—		(14.8		)	—		(14.8		)
Common stock repurchased and retired	(64.8		)	—		—			—		(64.8		)
Stock options exercised	6.6			—		—			—		6.6
Excess tax benefits from stock-based compensation	1.1			—		—			—		1.1
Dividends paid	(63.0		)	—		—			—		(63.0		)
Debt and equity issuance costs	(1.2		)	—		—			—		(1.2		)
Intercompany financing activities	(27.0		)			27.0					—
Net financing activities	(148.5		)	—		—			—		(148.5		)
Net (decrease) increase in cash and cash equivalents	(57.4		)	—		6.4			—		(51.0		)
Cash and cash equivalents, beginning of year	296.8			—		11.0			—		307.8
Cash and cash equivalents, end of year	$	239.4		$	—	$	17.4		$	—	$	256.8

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS
Year Ended December 31, 2013
(In millions)
	Parent Guarantor			Issuer	Subsidiary Non-Guarantor			Eliminations			Total
Net operating activities	$	336.9		—	$	(19.9	)	$	—		$	317.0
Investing Activities
Capital expenditures	(63.6		)	—	(27.2		)	—			(90.8		)
Proceeds from sale/leaseback of equipment	—			—	35.8			—			35.8
Proceeds from disposition of property, plant and equipment	3.7			—	0.9			—			4.6
Distributions from affiliated companies, net	1.5			—	—			—			1.5
Distributions from consolidated subsidiaries, Net	7.9			—	—			(7.9		)	—
Restricted cash activity, net	7.7			—	—			—			7.7
Other investing activities	—			—	(2.6		)	—			(2.6		)
Net investing activities	(42.8		)	—	6.9			(7.9		)	(43.8		)
Financing Activities
Long-term debt repayments	(11.5		)	—	(12.2		)	—			(23.7		)
Earn out payment - SunBelt	—			—	(17.1		)	—			(17.1		)
Common stock repurchased and retired	(36.2		)	—	—			—			(36.2		)
Stock options exercised	8.8			—	—			—			8.8
Excess tax benefits from stock-based compensation	1.6			—	—			—			1.6
Dividends paid	(64.0		)	—	(7.9		)	7.9			(64.0		)
Intercompany financing activities	(29.3		)		29.3						—
Net financing activities	(130.6		)	—	(7.9		)	7.9			(130.6		)
Net increase (decrease) in cash and cash equivalents	163.5			—	(20.9		)	—			142.6
Cash and cash equivalents, beginning of year	133.3			—	31.9			—			165.2
Cash and cash equivalents, end of year	$	296.8		—	$	11.0		—			$	307.8

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ACCOUNTING POLICIES (Policies)

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation

The consolidated financial statements include the accounts of Olin Corporation and all majority-owned subsidiaries. Investment in our affiliates are accounted for on the equity method.  Accordingly, we include only our share of earnings or losses of these affiliates in consolidated net (loss) income.  Certain reclassifications were made to prior year amounts to conform to the 2015 presentation.

Revenue Recognition

Revenue Recognition

Revenues are recognized on sales of product at the time the goods are shipped and the risks of ownership have passed to the customer.  Shipping and handling fees billed to customers are included in sales.  Allowances for estimated returns, discounts and rebates are recognized when sales are recorded and are based on various market data, historical trends and information from customers.  Actual returns, discounts and rebates have not been materially different from estimates.

Cost of Goods Sold and Selling and Administration Expenses

Cost of Goods Sold and Selling and Administration Expenses

Cost of goods sold includes the costs of inventory sold, related purchasing, distribution and warehousing costs, costs incurred for shipping and handling, depreciation and amortization expense related to these activities and environmental remediation costs and recoveries.  Selling and administration expenses include personnel costs associated with sales, marketing and administration, research and development, legal and legal-related costs, consulting and professional services fees, advertising expenses, depreciation expense related to these activities, foreign currency translation and other similar costs.

Other Operating Income

Other Operating Income

Other operating income consists of miscellaneous operating income items, which are related to our business activities, and (losses) gains on disposition of property, plant and equipment.

Included in other operating income were the following:

	Years Ended December 31,
	2015			2014		2013
	($ in millions)
(Losses) gains on disposition of property, plant and equipment, net	$	(0.6	)	$	0.2	$	(1.1	)
Gains on dispositions of former manufacturing facilities	—			—		1.5
Gains on insurance recoveries	46.0			—		—
Gain on resolution of a contract matter	—			1.0		—
Other	0.3			0.3		0.3
Other operating income	$	45.7		$	1.5	$	0.7

The gains on insurance recoveries in 2015 included insurance recoveries for property damage and business interruption of $42.3 million related to the portion of the Becancour, Canada chlor alkali facility that has been shut down since late June 2014 and $3.7 million related to the McIntosh, AL chlor alkali facility.

Other Income (Expense)

Other Income (Expense)

Other income (expense) consists of non-operating income items which are not related to our primary business activities.  Other income (expense) in 2013 included $7.9 million of expense for our earn out liability from the acquisition of the remaining 50% of the SunBelt Chlor Alkali Partnership, which we refer to as SunBelt. Other income (expense) in 2013 also included a gain of $6.5 million on the sale of our equity interest in a bleach joint venture.

Foreign Currency Translation

Foreign Currency Translation

Our worldwide operations utilize the U.S. dollar (USD) or local currency as the functional currency, where applicable. For foreign entities where the USD is the functional currency, gains and losses resulting from balance sheet translations are included in selling and administration. For foreign entities where the local currency is the functional currency, assets and liabilities denominated in local currencies are translated into USD at end-of-period exchange rates and the resultant translation adjustments are included in accumulated other comprehensive loss. Assets and liabilities denominated in other than the local currency are remeasured into the local currency prior to translation into USD and the resultant exchange gains or losses are included in income in the period in which they occur. Income and expenses are translated into USD using an approximation of the average rate prevailing during the period. We change the functional currency of our separate and distinct foreign entities only when significant changes in economic facts and circumstances indicate clearly that the functional currency has changed.

Cash and Cash Equivalents

Cash and Cash Equivalents

All highly liquid investments, with a maturity of three months or less at the date of purchase, are considered to be cash equivalents.

Short-Term Investments

Short-Term Investments

We classify our marketable securities as available-for-sale, which are reported at fair market value with unrealized gains and losses included in accumulated other comprehensive loss, net of applicable taxes.  The fair value of marketable securities is determined by quoted market prices.  Realized gains and losses on sales of investments, as determined on the specific identification method, and declines in value of securities judged to be other-than-temporary are included in other income (expense) in the consolidated statements of operations.  Interest and dividends on all securities are included in interest income and other income (expense), respectively.

Allowance for Doubtful Accounts Receivable

Allowance for Doubtful Accounts Receivable

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.

Inventories

Inventories

Inventories are valued at the lower of cost or market. For U.S. inventories, inventory costs are determined principally by the dollar value 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 include raw materials, direct labor and manufacturing overhead.

Property, Plant and Equipment

Property, Plant and Equipment

Property, plant and equipment are recorded at cost.  Depreciation is computed on a straight-line basis over the estimated useful lives of the related assets.  Interest costs incurred to finance expenditures for major long-term construction projects are capitalized as part of the historical cost and included in property, plant and equipment and are depreciated over the useful lives of the related assets.  Leasehold improvements are amortized over the term of the lease or the estimated useful life of the improvement, whichever is shorter.  Start-up costs are expensed as incurred.  Expenditures for maintenance and repairs are charged to expense when incurred while the costs of significant improvements, which extend the useful life of the underlying asset, are capitalized.

Property, plant and equipment are reviewed for impairment when conditions indicate that the carrying values of the assets may not be recoverable.  Such impairment conditions include an extended period of idleness or a plan of disposal.  If such impairment indicators are present or other factors exist that indicate that the carrying amount of an asset may not be recoverable, we determine whether impairment has occurred through the use of an undiscounted cash flow analysis at the lowest level for which identifiable cash flows exist.  For our Chlor Alkali Products and Vinyls, Epoxy and Winchester segments, the lowest level for which identifiable cash flows exist is the operating facility level or an appropriate grouping of operating facilities level. The amount of impairment loss, if any, is measured by the difference between the net book value of the assets and the estimated fair value of the related assets.

Restricted Cash

Restricted Cash

Restricted cash, which is restricted as to withdrawal or usage, is classified on our consolidated balance sheet as a noncurrent asset separately from cash and cash equivalents.

Asset Retirement Obligations

Asset Retirement Obligations

We record the fair value of an asset retirement obligation associated with the retirement of a tangible long-lived asset as a liability in the period incurred.  The liability is measured at discounted fair value and is adjusted to its present value in subsequent periods as accretion expense is recorded.  The corresponding asset retirement costs are capitalized as part of the carrying amount of the related long-lived asset and depreciated over the asset’s useful life.  Asset retirement obligations are reviewed annually in the fourth quarter and/or when circumstances or other events indicate that changes underlying retirement assumptions may have occurred.

The activity of our asset retirement obligation was as follows:

	December 31,
	2015			2014
	($ in millions)
Beginning balance	$	54.4		$	60.8
Accretion	3.6			3.5
Spending	(8.2		)	(11.2		)
Currency translation adjustments	(1.1		)	(0.7		)
Acquisition activity	1.7			—
Adjustments	3.1			2.0
Ending balance	$	53.5		$	54.4

At December 31, 2015 and 2014, our consolidated balance sheets included an asset retirement obligation of $46.2 million and $44.2 million, respectively, which were classified as other noncurrent liabilities.

In 2015, we had net adjustments that increased the asset retirement obligation by $3.1 million, which were primarily comprised of increases in estimated costs for certain assets. In 2014, we had net adjustments that increased the asset retirement obligation by $2.0 million, which were primarily due to changes in the estimated timing of payments for certain assets.

Comprehensive Income (Loss)

Comprehensive Income (Loss)

Accumulated other comprehensive loss consists of foreign currency translation adjustments, pension and postretirement liability adjustments, pension and postretirement amortization of prior service costs and actuarial losses and net unrealized (losses) gains on derivative contracts.  

Goodwill

Goodwill and Intangible Assets

Goodwill is not amortized, but is reviewed for impairment annually in the fourth quarter and/or when circumstances or other events indicate that impairment may have occurred.  On January 1, 2012, we adopted Accounting Standards Update (ASU) 2011-08 “Testing Goodwill for Impairment” (ASU 2011-08) which permits entities to make a qualitative assessment of whether it is more likely than not that a reporting unit’s fair value is less than its carrying amount before applying the two-step goodwill impairment test. Circumstances that are considered as part of the qualitative assessment and could trigger the two-step impairment test include, but are not limited to:  a significant adverse change in the business climate; a significant adverse legal judgment; adverse cash flow trends; an adverse action or assessment by a government agency; unanticipated competition; decline in our stock price; and a significant restructuring charge within a reporting unit.  We define reporting units at the business segment level or one level below the business segment level.  For purposes of testing goodwill for impairment, goodwill has been allocated to our reporting units to the extent it relates to each reporting unit. Based upon our qualitative assessment, it is more likely than not that the fair value of our reporting units are greater than their carrying value at December 31, 2015.  No impairment charges were recorded for 2015, 2014 or 2013.

It is our practice, at a minimum, to perform a quantitative goodwill impairment test in the fourth quarter every three years. In the fourth quarter of 2014, we performed our triennial quantitative goodwill impairment test for our reporting units. We use a discounted cash flow approach to develop the estimated fair value of a reporting unit when a quantitative test is performed.  Management judgment is required in developing the assumptions for the discounted cash flow model.  We also corroborate our discounted cash flow analysis by evaluating a market-based approach that considers earnings before interest, taxes, depreciation and amortization (EBITDA) multiples from a representative sample of comparable public companies.  As a further indicator that each reporting unit has been valued appropriately using a discounted cash flow model, the aggregate fair value of all reporting units is reconciled to the total market value of Olin. An impairment would be recorded if the carrying amount exceeded the estimated fair value.

The discount rate, profitability assumptions and terminal growth rate of our reporting units and the cyclical nature of the chlor alkali industry were the material assumptions utilized in the discounted cash flow model used to estimate the fair value of each reporting unit.  The discount rate reflects a weighted-average cost of capital, which is calculated based on observable market data.  Some of these data (such as the risk free or treasury rate and the pretax cost of debt) are based on the market data at a point in time.  Other data (such as the equity risk premium) are based uponmarket data over time for a peer group of companies in the chemical manufacturing or distribution industries with a market capitalization premium added, as applicable.

The discounted cash flow analysis requires estimates, assumptions and judgments about future events.  Our analysis uses our internally generated long-range plan.  Our discounted cash flow analysis uses the assumptions in our long-range plan about terminal growth rates, forecasted capital expenditures and changes in future working capital requirements to determine the implied fair value of each reporting unit.  The long-range plan reflects management judgment, supplemented by independent chemical industry analyses which provide multi-year industry operating and pricing forecasts.

We believe the assumptions used in our goodwill impairment analysis are appropriate and result in reasonable estimates of the implied fair value of each reporting unit. However, given the economic environment and the uncertainties regarding the impact on our business, there can be no assurance that our estimates and assumptions, made for purposes of our goodwill impairment testing will prove to be an accurate prediction of the future.  If our assumptions regarding future performance are not achieved, we may be required to record goodwill impairment charges in future periods.  It is not possible at this time to determine if any such future impairment charge would result or, if it does, whether such charge would be material.

During 2012, we adopted ASU 2012-02 “Testing Indefinite Lived Intangible Assets for Impairment” (ASU 2012-02) which permits entities to make a qualitative assessment of whether it is more likely than not that an indefinite-lived intangible asset’s fair value is less than its carrying amount before performing a quantitative impairment test. Circumstances that are considered as part of the qualitative assessment and could trigger a quantitative impairment test include, but are not limited to:  a significant adverse change in the business climate; a significant adverse legal judgment including asset specific factors; adverse cash flow trends; an adverse action or assessment by a government agency; unanticipated competition; decline in our stock price; and a significant restructuring charge within a reporting unit. Based upon our qualitative assessment, it is more likely than not that the fair value of our indefinite-lived intangible asset is greater than its carrying amount as of December 31, 2015. No impairment of our intangible assets were recorded in 2015, 2014 or 2013.

Other Assets

Other Assets

Included in other assets were the following:

	December 31,
	2015		2014
	($ in millions)
Investments in non-consolidated affiliates	$	25.0	$	23.3
Deferred debt issuance costs	3.3		1.4
Bleach joint venture receivable	—		7.8
Income tax receivable	1.5		6.6
Interest rate swaps	—		3.5
Supply contracts	406.5		—
Other	18.3		16.4
Other assets	$	454.6	$	59.0

In connection with the Acquisition, Olin and TDCC have agreed to enter into arrangements for the long-term supply of ethylene by TDCC to Olin, pursuant to which, among other things, Olin has made upfront payments of $433.5 million upon the Closing Date in order to receive ethylene at producer economics and for certain reservation fees for the option to obtain additional future ethylene supply at producer economics. The fair value of the long-term supply contracts recorded as of the Closing Date was a long-term asset of $410.8 million which will be amortized over the life of the contracts as ethylene is received. If the options are exercised by us, additional payments will be made to TDCC of between $230 million and $250 million on or about the fourth quarter of 2017 and between $425 million and $465 million on or about the fourth quarter of 2020, which will increase the value of the long-term asset. Amortization expense of $4.3 million was recognized within cost of goods sold in 2015 related to these supply contracts and is reflected in depreciation and amortization on the consolidated statements of cash flows. The long-term supply contracts are monitored for impairment each reporting period.

Environmental Liabilities and Expenditures

Environmental Liabilities and Expenditures

Accruals (charges to income) for environmental matters are recorded when it is probable that a liability has been incurred and the amount of the liability can be reasonably estimated, based upon current law and existing technologies.  These amounts, which are not discounted and are exclusive of claims against third parties, are adjusted periodically as assessment and remediation efforts progress or additional technical or legal information becomes available.  Environmental costs are capitalized if the costs increase the value of the property and/or mitigate or prevent contamination from future operations.

Discontinued Operations

Discontinued Operations

We present the results of operations, financial position and cash flows that have either been sold or that meet the criteria for “held for sale” accounting as discontinued operations. At the time an operation qualifies for held for sale accounting, the operation is evaluated to determine whether or not the carrying value exceeds its fair value less cost to sell. Any loss as a result of carrying value in excess of fair value less cost to sell is recorded in the period the operation meets held for sale accounting. Management judgment is required to assess the criteria required to meet held for sale accounting, and estimate fair value. Changes to the operation could cause it to no longer qualify for held for sale accounting and changes to fair value or adjustments to amounts previously reported as discontinued operations could result in an increase or decrease to previously recognized losses.

Income Taxes

Income Taxes

Deferred taxes are provided for differences between the financial statement and tax bases of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse.  A valuation allowance is provided to offset deferred tax assets if, based on the available evidence, it is more likely than not that some or all of the value of the deferred tax assets will not be realized.

Derivative Financial Instruments

Derivative Financial Instruments

We are exposed to market risk in the normal course of our business operations due to our purchases of certain commodities, our ongoing investing and financing activities and our operations that use foreign currencies.  The risk of loss can be assessed from the perspective of adverse changes in fair values, cash flows and future earnings.  We have established policies and procedures governing our management of market risks and the use of financial instruments to manage exposure to such risks.  We use hedge accounting treatment for substantially all of our business transactions whose risks are covered using derivative instruments.  The hedge accounting treatment provides for the deferral of gains or losses on derivative instruments until such time as the related transactions occur.

Concentration of Credit Risk

Concentration of Credit Risk

Accounts receivable is the principal financial instrument which subjects us to a concentration of credit risk.  Credit is extended based upon the evaluation of a customer’s financial condition and, generally, collateral is not required. Concentrations of credit risk with respect to receivables are somewhat limited due to our large number of customers, the diversity of these customers’ businesses and the geographic dispersion of such customers.  Our accounts receivable are predominantly derived from sales denominated in USD or the Euro.  We maintain an allowance for doubtful accounts based upon the expected collectibility of all trade receivables.

Fair Value

Fair Value

Fair value is defined as the price at which an asset could be exchanged in a current transaction between knowledgeable, willing parties or the amount that would be paid to transfer a liability to a new obligor, not the amount that would be paid to settle the liability with the creditor.  Where available, fair value is based on observable market prices or parameters or derived from such prices or parameters.  Where observable prices or inputs are not available, valuation models are applied.  These valuation techniques involve some level of management estimation and judgment, the degree of which is dependent on the price transparency for the instruments or market and the instruments’ complexity.

Assets and liabilities recorded at fair value in the consolidated balance sheets are categorized based upon the level of judgment associated with the inputs used to measure their fair value.  Hierarchical levels, defined by Accounting Standards Codification (ASC) 820 “Fair Value Measurement” (ASC 820), and directly related to the amount of subjectivity associated with the inputs to fair valuation of these assets and liabilities, are as follows:

Level 1 — Inputs were unadjusted, quoted prices in active markets for identical assets or liabilities at the measurement date.

Level 2 — Inputs (other than quoted prices included in Level 1) were either directly or indirectly observable for the asset or liability through correlation with market data at the measurement date and for the duration of the instrument’s anticipated life.

Level 3 — Inputs reflected management’s best estimate of what market participants would use in pricing the asset or liability at the measurement date.  Consideration was given to the risk inherent in the valuation technique and the risk inherent in the inputs to the model.

Retirement-Related Benefits

Retirement-Related Benefits

We account for our defined benefit pension plans and non-pension postretirement benefit plans using actuarial models required by ASC 715 “Compensation-Retirement Benefits” (ASC 715).  These models use an attribution approach that generally spreads the financial impact of changes to the plan and actuarial assumptions over the average remaining service lives of the employees in the plan.  Changes in liability due to changes in actuarial assumptions such as discount rate, rate of compensation increases and mortality, as well as annual deviations between what was assumed and what was experienced by the plan are treated as actuarial gains or losses.  The principle underlying the required attribution approach is that employees render service over their average remaining service lives on a relatively smooth basis and, therefore, the accounting for benefits earned under the pension or non-pension postretirement benefits plans should follow the same relatively smooth pattern.  Substantially all domestic defined benefit pension plan participants are no longer accruing benefits; therefore, actuarial gains and losses are amortized based upon the remaining life expectancy of the inactive plan participants.  For the years ended December 31, 2015 and 2014, the average remaining life expectancy of the inactive participants in the defined benefit pension plan was 19 years and 18 years, respectively.

One of the key assumptions for the net periodic pension calculation is the expected long-term rate of return on plan assets, used to determine the “market-related value of assets.”  The “market-related value of assets” recognizes differences between the plan’s actual return and expected return over a five year period.  The required use of an expected long-term rate of return on the market-related value of plan assets may result in a recognized pension income that is greater or less than the actual returns of those plan assets in any given year.  Over time, however, the expected long-term returns are designed to approximate the actual long-term returns and, therefore, result in a pattern of income and expense recognition that more closely matches the pattern of the services provided by the employees.  As differences between actual and expected returns are recognized over five years, they subsequently generate gains and losses that are subject to amortization over the average remaining life expectancy of the inactive plan participants, as described in the preceding paragraph.

We use long-term historical actual return information, the mix of investments that comprise plan assets, and future estimates of long-term investment returns and inflation by reference to external sources to develop the expected long-term rate of return on plan assets as of December 31.

The discount rate assumptions used for pension and non-pension postretirement benefit plan accounting reflect the rates available on high-quality fixed-income debt instruments on December 31 of each year.  The rate of compensation increase is based upon our long-term plans for such increases.  For retiree medical plan accounting, we review external data and our own historical trends for healthcare costs to determine the healthcare cost trend rates.

Stock-Based Compensation

Stock-Based Compensation

We measure the cost of employee services received in exchange for an award of equity instruments, such as stock options, performance shares and restricted stock, based on the grant-date fair value of the award.  This cost is recognized over the period during which an employee is required to provide service in exchange for the award, the requisite service period (usually the vesting period).  An initial measurement is made of the cost of employee services received in exchange for an award of liability instruments based on its current fair value and the value of that award is subsequently remeasured at each reporting date through the settlement date.  Changes in fair value of liability awards during the requisite service period are recognized as compensation cost over that period.

The fair value of each option granted, which typically vests ratably over three years, but not less than one year, was estimated on the date of grant, using the Black-Scholes option-pricing model with the following assumptions:

	2015			2014			2013
Dividend yield	2.92		%	3.13		%	3.44		%
Risk-free interest rate	1.69		%	2.13		%	1.35		%
Expected volatility	34		%	42		%	43		%
Expected life (years)	6.0			7.0			7.0
Weighted-average grant fair value (per option)	$	6.80		$	8.34		$	7.05
Weighted-average exercise price	$	27.40		$	25.69		$	23.28
Shares granted	776,750			624,200			621,000

Dividend yield was based on a historical average.  Risk-free interest rate was based on zero coupon U.S. Treasury securities rates for the expected life of the options.  Expected volatility was based on our historical stock price movements, as we believe that historical experience is the best available indicator of the expected volatility.  Expected life of the option grant was based on historical exercise and cancellation patterns, as we believe that historical experience is the best estimate for future exercise patterns.

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ACCOUNTING POLICIES (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2016

Dec. 31, 2015

Accounting Policies [Abstract]

Other Operating Income

Included in other operating income were the following:

	Years Ended December 31,
	2015			2014		2013
	($ in millions)
(Losses) gains on disposition of property, plant and equipment, net	$	(0.6	)	$	0.2	$	(1.1	)
Gains on dispositions of former manufacturing facilities	—			—		1.5
Gains on insurance recoveries	46.0			—		—
Gain on resolution of a contract matter	—			1.0		—
Other	0.3			0.3		0.3
Other operating income	$	45.7		$	1.5	$	0.7

Asset retirement obligation activity

The activity of our asset retirement obligation was as follows:

	December 31,
	2015			2014
	($ in millions)
Beginning balance	$	54.4		$	60.8
Accretion	3.6			3.5
Spending	(8.2		)	(11.2		)
Currency translation adjustments	(1.1		)	(0.7		)
Acquisition activity	1.7			—
Adjustments	3.1			2.0
Ending balance	$	53.5		$	54.4

Other Assets

Included in other assets were the following:

	December 31,
	2015		2014
	($ in millions)
Investments in non-consolidated affiliates	$	25.0	$	23.3
Deferred debt issuance costs	3.3		1.4
Bleach joint venture receivable	—		7.8
Income tax receivable	1.5		6.6
Interest rate swaps	—		3.5
Supply contracts	406.5		—
Other	18.3		16.4
Other assets	$	454.6	$	59.0

Schedule of assumptions for the Black-Scholes option pricing model

The fair value of each stock option granted, which typically vests ratably over three years, but not less than one year, was estimated on the date of grant, using the Black-Scholes option-pricing model with the following weighted-average assumptions:

Grant date	2016			2015
Dividend yield	6.09		%	2.92		%
Risk-free interest rate	1.35		%	1.69		%
Expected volatility	32		%	34		%
Expected life (years)	6.0			6.0
Weighted average grant fair value (per option)	$	1.90		$	6.80
Weighted average exercise price	$	13.14		$	27.40
Shares granted	1,670,400			776,750

The fair value of each option granted, which typically vests ratably over three years, but not less than one year, was estimated on the date of grant, using the Black-Scholes option-pricing model with the following assumptions:

	2015			2014			2013
Dividend yield	2.92		%	3.13		%	3.44		%
Risk-free interest rate	1.69		%	2.13		%	1.35		%
Expected volatility	34		%	42		%	43		%
Expected life (years)	6.0			7.0			7.0
Weighted-average grant fair value (per option)	$	6.80		$	8.34		$	7.05
Weighted-average exercise price	$	27.40		$	25.69		$	23.28
Shares granted	776,750			624,200			621,000

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ACQUISITION (Tables) - DCP Business

3 Months Ended

12 Months Ended

Mar. 31, 2016

Dec. 31, 2015

Business Acquisition [Line Items]

Schedule of Aggregate Purchase Consideration [Table Text Block]

The following table summarizes the aggregate purchase price for the Acquired Business and related transactions, after the final post-closing adjustments:

	October 5, 2015
	(In millions, except per share data)
Shares	87.5
Value of common stock on October 2, 2015	17.46
Equity consideration by exchange of shares	$	1,527.4
Cash and debt instruments received by TDCC	2,095.0
Accrual for future payments	69.5
Up-front payments under the ethylene agreements	433.5
Total cash, debt and equity consideration	$	4,125.4
Long-term debt assumed	569.0
Pension liabilities assumed	442.3
Aggregate purchase price	$	5,136.7

The following table summarizes the aggregate purchase price for the Acquired Business and related transactions, subject to certain post-closing adjustments:

	October 5, 2015
	(In millions, except per share data)
Shares	87.5
Value of common stock on October 2, 2015	17.46
Equity consideration by exchange of shares	$	1,527.4
Cash and debt instruments received by TDCC	2,095.0
Accrual for future payments	90.2
Up-front payments under the ethylene agreements	433.5
Total cash, debt and equity consideration	$	4,146.1
Long-term debt assumed	569.0
Pension liabilities assumed	447.1
Aggregate purchase price	$	5,162.2

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]

The following table summarizes the preliminary allocation of the purchase price to the Acquired Business’s assets and liabilities on the Closing Date:

	Initial Valuation		Measurement Period Adjustments			As of March 31, 2016
	($ in millions)
Total current assets	$	921.7	$	(2.9	)	$	918.8
Property, plant and equipment	3,090.8		—			3,090.8
Deferred taxes	76.8		—			76.8
Intangible assets	582.3		—			582.3
Other assets	426.5		6.2			432.7
Total assets acquired	5,098.1		3.3			5,101.4
Total current liabilities	357.6		(6.2		)	351.4
Long-term debt	517.9		—			517.9
Accrued pension liability	447.1		(4.8		)	442.3
Deferred tax liability	1,054.9		—			1,054.9
Other liabilities	2.0		6.2			8.2
Total liabilities assumed	2,379.5		(4.8		)	2,374.7
Net identifiable assets acquired	2,718.6		8.1			2,726.7
Goodwill	1,427.5		(28.8		)	1,398.7
Fair value of net assets acquired	$	4,146.1	$	(20.7	)	$	4,125.4

The following table summarizes the preliminary allocation of the purchase price to the Acquired Business’s assets and liabilities:

	October 5, 2015
	($ in millions)
Total current assets	$	921.7
Property, plant and equipment	3,090.8
Deferred taxes	76.8
Intangible assets	582.3
Other assets	426.5
Total assets acquired	5,098.1
Total current liabilities	357.6
Long-term debt	517.9
Accrued pension liability	447.1
Deferred tax liability	1,054.9
Other liabilities	2.0
Total liabilities assumed	2,379.5
Net identifiable assets acquired	2,718.6
Goodwill	1,427.5
Fair value of net assets acquired	$	4,146.1

Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]

Based on preliminary valuations, purchase price was allocated to intangible assets as follows:

	October 5, 2015
	Weighted-Average Amortization Period	Gross Amount
		($ in millions)
Customers, customer contracts and relationships	15 Years	$	490.3
Acquired technology	7 Years	85.0
Trade name	Indefinite	7.0
Total acquired intangible assets		$	582.3

Based on preliminary valuations, purchase price was allocated to intangible assets as follows:

	October 5, 2015
	Weighted-Average Amortization Period	Gross Amount
		($ in millions)
Customers, customer contracts and relationships	15 Years	$	490.3
Acquired technology	7 Years	85.0
Trade name	Indefinite	7.0
Total acquired intangible assets		$	582.3

Pro forma summary

The following pro forma summary reflects consolidated results of operation as if the Acquisition had occurred on January 1, 2014 (unaudited).

	Three Months Ended March 31,
	2015
	(In millions, except per share data)
Sales	$	1,439.0
Net loss	(39.5		)
Net loss per common share:
Basic	$	(0.24	)
Diluted	$	(0.24	)

The following pro forma summary reflects consolidated results of operation as if the Acquisition had occurred on January 1, 2014 (unaudited).

	Years Ended December 31,
	2015			2014
	($ in millions, except per share data)
Sales	$	5,681.8		$	6,948.2
Net (loss) income	(36.4		)	2.4
Net (loss) income per common share:
Basic	$	(0.22	)	$	0.01
Diluted	$	(0.22	)	$	0.01

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RESTRUCTURING CHARGES (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2016

Dec. 31, 2015

Restructuring and Related Activities [Abstract]

Schedule of Restructuring Reserve by Type of Cost [Table Text Block]

The following table summarizes the activity by major component of these 2016, 2014 and 2010 restructuring actions and the remaining balances of accrued restructuring costs as of March 31, 2016:

		Employee severance and job related benefits			Lease and other contract termination costs			Employee relocation costs			Facility exit costs			Write-off of equipment and facility			Total
		($ in millions)
Balance at January 1, 2015		$	11.2		$	4.5		$	—		$	—		$	—		$	15.7
	Restructuring charges	—			0.7			0.1			0.2			0.2			1.2
	Amounts utilized	(2.8		)	—			(0.1		)	(0.2		)	(0.2		)	(3.3		)
	Currency translation adjustments	(0.4		)	(0.3		)	—			—			—			(0.7		)
Balance at March 31, 2015		$	8.0		$	4.9		$	—		$	—		$	—		$	12.9
Balance at January 1, 2016		$	4.6		$	2.1		$	—		$	—		$	—		$	6.7
	Restructuring charges	3.9			9.2			0.2			2.9			76.6			92.8
	Amounts utilized	(1.7		)	(0.1		)	(0.2		)	(0.6		)	(76.6		)	(79.2		)
	Currency translation adjustments	0.1			0.1			—			—			—			0.2
Balance at March 31, 2016		$	6.9		$	11.3		$	—		$	2.3		$	—		$	20.5

The following table summarizes the 2015, 2014 and 2013 activities by major component of these 2014 and 2010 restructuring actions and the remaining balances of accrued restructuring costs as of December 31, 2015:

	Employee severance and job related benefits			Lease and other contract termination costs			Employee relocation costs			Facility exit costs			Write-off of equipment and facility			Total
	($ in millions)
Balance January 1, 2013	$	13.5		$	0.4		$	—		$	—		$	—		$	13.9
2013 restructuring charges (credits)	0.4			(0.4		)	0.6			4.9			—			5.5
Amounts utilized	(3.7		)	—			(0.6		)	(4.9		)	—			(9.2		)
Balance at December 31, 2013	10.2			—			—			—			—			10.2
2014 restructuring charges	4.5			4.5			0.5			2.9			3.3			15.7
Amounts utilized	(3.5		)	—			(0.5		)	(2.9		)	(3.3		)	(10.2		)
Balance at December 31, 2014	11.2			4.5			—			—			—			15.7
2015 restructuring charges	—			0.7			0.6			0.9			0.5			2.7
Amounts utilized	(6.0		)	(2.9		)	(0.6		)	(0.9		)	(0.5		)	(10.9		)
Currency translation adjustments	(0.6		)	(0.2		)	—			—			—			(0.8		)
Balance at December 31, 2015	$	4.6		$	2.1		$	—		$	—		$	—		$	6.7

Restructuring and Related Costs [Table Text Block]

The following table summarizes the cumulative restructuring charges of these 2016, 2014 and 2010 restructuring actions by major component through March 31, 2016:

	Chlor Alkali Products and Vinyls				Winchester		Total
	Becancour		Capacity Reductions
	($ in millions)
Write-off of equipment and facility	$	3.5	$	76.6	$	—	$	80.1
Employee severance and job related benefits	2.7		3.9		13.1		19.7
Facility exit costs	0.9		2.5		2.3		5.7
Pension and other postretirement benefits curtailment	—		—		4.1		4.1
Employee relocation costs	—		—		5.5		5.5
Lease and other contract termination costs	5.2		9.2		—		14.4
Total cumulative restructuring charges	$	12.3	$	92.2	$	25.0	$	129.5

The following table summarizes the cumulative restructuring charges of these 2014 and 2010 restructuring actions by major component through December 31, 2015:

	Chlor Alkali Products and Vinyls				Winchester		Total
	Becancour		Mercury
	($ in millions)
Write-off of equipment and facility	$	3.5	$	17.8	$	—	$	21.3
Employee severance and job related benefits	2.7		5.6		13.1		21.4
Facility exit costs	0.6		15.6		2.2		18.4
Pension and other postretirement benefits curtailment	—		—		4.1		4.1
Employee relocation costs	—		0.9		5.3		6.2
Lease and other contract termination costs	5.2		0.7		—		5.9
Total cumulative restructuring charges	$	12.0	$	40.6	$	24.7	$	77.3

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DISCONTINUED OPERATIONS (Tables)

12 Months Ended

Dec. 31, 2015

Discontinued Operations [Abstract]

Discontinued Operations

Income from discontinued operations, net consisted of the following:

	Years Ended December 31,
	2015		2014		2013
	($ in millions)
Income from discontinued operations	$	—	$	4.6	$	—
Tax provision	—		3.9		—
Income from discontinued operations, net	$	—	$	0.7	$	—

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EARNINGS PER SHARE (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2016

Dec. 31, 2015

Earnings Per Share [Abstract]

Basic and Diluted Earnings Per Share Table

	Three Months Ended March 31,
	2016			2015
Computation of Income (Loss) per Share	(In millions, except per share data)
Net (loss) income	$	(37.9	)	$	13.1
Basic shares	165.1			77.4
Basic net (loss) income per share	$	(0.23	)	$	0.17
Diluted shares:
Basic shares	165.1			77.4
Stock-based compensation	—			1.1
Diluted shares	165.1			78.5
Diluted net (loss) income per share	$	(0.23	)	$	0.17

	Years ended December 31,
	2015			2014		2013
Computation of Income (loss) per Share	(In millions, except per share data)
Income (loss) from continuing operations, net	$	(1.4	)	$	105.0	$	178.6
Income from discontinued operations, net	—			0.7		—
Net (loss) income	$	(1.4	)	$	105.7	$	178.6
Basic shares	103.4			78.6		79.9
Basic (loss) income per share:
Income (loss) from continuing operations	$	(0.01	)	$	1.33	$	2.24
Income from discontinued operations, net	—			0.01		—
Net (loss) income	$	(0.01	)	$	1.34	$	2.24
Diluted shares:
Basic shares	103.4			78.6		79.9
Stock-based compensation	—			1.1		1.0
Diluted shares	103.4			79.7		80.9
Diluted (loss) income per share:
Income (loss) from continuing operations	$	(0.01	)	$	1.32	$	2.21
Income from discontinued operations, net	—			0.01		—
Net (loss) income	$	(0.01	)	$	1.33	$	2.21

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ALLOWANCE FOR DOUBTFUL ACCOUNTS RECEIVABLES (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2016

Dec. 31, 2015

Accounts Receivable, Net [Abstract]

Allowance for Doubtful Accounts Receivable

Allowance for doubtful accounts receivable consisted of the following:

	March 31,
	2016			2015
	($ in millions)
Balance at beginning of year	$	6.4		$	3.0
Provisions charged	1.4			0.2
Write-offs, net of recoveries	(1.5		)	(0.1		)
Balance at end of period	$	6.3		$	3.1

ALLOWANCE FOR DOUBTFUL ACCOUNTS RECEIVABLES

Allowance for doubtful accounts receivable consisted of the following:

	December 31,
	2015			2014
	($ in millions)
Beginning balance	$	3.0		$	3.4
Provisions charged	5.2			0.2
Write-offs, net of recoveries	(1.8		)	(0.6		)
Ending balance	$	6.4		$	3.0

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INVENTORIES (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2016

Dec. 31, 2015

Inventory Disclosure [Abstract]

Inventories Table

Inventories consisted of the following:

	March 31, 2016			December 31, 2015			March 31, 2015
	($ in millions)
Supplies	$	73.7		$	86.5		$	40.2
Raw materials	88.0			91.5			63.6
Work in process	108.1			105.8			37.2
Finished goods	452.2			445.3			141.1
	722.0			729.1			282.1
LIFO reserve	(42.5		)	(43.9		)	(66.0		)
Inventories, net	$	679.5		$	685.2		$	216.1

	December 31,
	2015			2014
	($ in millions)
Supplies	$	86.5		$	39.2
Raw materials	91.5			63.3
Work in process	105.8			31.8
Finished goods	445.3			141.5
	729.1			275.8
LIFO reserves	(43.9		)	(65.7		)
Inventories, net	$	685.2		$	210.1

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PROPERTY, PLANT AND EQUIPMENT (Tables)

12 Months Ended

Dec. 31, 2015

Property, Plant and Equipment [Abstract]

Schedule of property, plant and equipment along with respective useful lives

		December 31,
	Useful Lives	2015			2014
		($ in millions)
Land and improvements to land	10-20 Years	$	280.4		$	157.3
Buildings and building equipment	10-30 Years	380.4			212.1
Machinery and equipment	3-15 Years	4,665.8			1,846.1
Leasehold improvements		2.7			2.6
Construction in progress		123.5			43.6
Property, plant and equipment		5,452.8			2,261.7
Accumulated depreciation		(1,499.4		)	(1,330.7		)
Property, plant and equipment, net		$	3,953.4		$	931.0

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INVESTMENTS-AFFILIATED COMPANIES (Tables)

12 Months Ended

Dec. 31, 2015

Equity Method Investments and Joint Ventures [Abstract]

Investment in non-consolidated equity affiliates

The following table summarizes our investment in our non-consolidated equity affiliate:

	December 31,
	2015		2014
	($ in millions)
Bay Gas	$	25.0	$	23.3

Summary of equity earnings of non-consolidated affiliates

The following table summarizes our equity earnings of non-consolidated affiliates:

	Years Ended December 31,
	2015		2014		2013
	($ in millions)
Bay Gas	$	1.7	$	1.7	$	2.1
Bleach joint venture	—		—		0.7
Equity earnings of non-consolidated affiliates	$	1.7	$	1.7	$	2.8

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OTHER ASSETS (Tables)

3 Months Ended

Mar. 31, 2016

Other Assets [Abstract]

Schedule of Other Assets [Table Text Block]

Included in other assets were the following:

	March 31, 2016		December 31, 2015		March 31, 2015
	($ in millions)
Investments in non-consolidated affiliates	$	25.2	$	25.0	$	23.7
Deferred debt issuance costs	3.1		3.3		15.1
Bleach joint venture receivable	—		—		5.8
Tax-related receivables	14.4		1.5		6.6
Interest rate swaps	—		—		2.9
Supply contracts	402.2		406.5		—
Other	18.9		18.3		16.1
Other assets	$	463.8	$	454.6	$	70.2

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GOODWILL AND INTANGIBLES GOODWILL AND INTANGIBLES (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2016

Dec. 31, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill [Table Text Block]

Changes in the carrying value of goodwill were as follows:

	Chlor Alkali Products and Vinyls			Epoxy			Total
	($ in millions)
Balance at January 1, 2015	$	747.1		$	—		$	747.1
Acquisition activity	—			—			—
Balance at March 31, 2015	$	747.1		$	—		$	747.1
Balance at January 1, 2016	$	1,877.5		$	296.6		$	2,174.1
Acquisition activity	(23.3		)	(5.5		)	(28.8		)
Foreign currency translation adjustment	0.6			0.2			0.8
Balance at March 31, 2016	$	1,854.8		$	291.3		$	2,146.1

Changes in the carrying value of goodwill were as follows:

	Chlor Alkali Products and Vinyls			Epoxy			Total
	($ in millions)
Balance at January 1, 2014	$	747.1		$	—		$	747.1
Acquisition activity	—			—			—
Balance at December 31, 2014	747.1			—			747.1
Acquisition activity	1,130.8			296.7			1,427.5
Foreign currency translation adjustment	(0.4		)	(0.1		)	(0.5		)
Balance at December 31, 2015	$	1,877.5		$	296.6		$	2,174.1

Schedule of Finite-Lived Intangible Assets [Table Text Block]

Intangible assets consisted of the following:

	March 31, 2016								December 31, 2015								March 31, 2015
	Gross Amount		Accumulated Amortization				Net		Gross Amount		Accumulated Amortization				Net		Gross Amount		Accumulated Amortization				Net
	($ in millions)
Customers, customer contracts and relationships	$	643.8		$	(75.9	)	$	567.9	$	641.0		$	(64.0	)	$	577.0	$	152.9		$	(44.7	)	$	108.2
Trade name	17.9			(2.7		)	15.2		17.9			—			17.9		10.9			—			10.9
Acquired technology	85.2			(5.7		)	79.5		84.7			(2.7		)	82.0		—			—			—
Other	2.3			(1.7		)	0.6		2.3			(1.7		)	0.6		2.3			(1.6		)	0.7
Total intangible assets	$	749.2		$	(86.0	)	$	663.2	$	745.9		$	(68.4	)	$	677.5	$	166.1		$	(46.3	)	$	119.8

Intangible assets consisted of the following:

		December 31,
		2015							2014
	Useful Lives	Gross Amount		Accumulated Amortization			Net		Gross Amount		Accumulated Amortization			Net
		($ in millions)
Customers, customer contracts and relationships	(10-15 years)	$	641.0	$	(64.0	)	$	577.0	$	152.9	$	(41.0	)	$	111.9
Trade name	(indefinite)	17.9		—			17.9		10.9		—			10.9
Acquired technology	(7 years)	84.7		(2.7		)	82.0		—		—			—
Other	(4-10 years)	2.3		(1.7		)	0.6		2.3		(1.6		)	0.7
Total intangible assets		$	745.9	$	(68.4	)	$	677.5	$	166.1	$	(42.6	)	$	123.5

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DEBT (Tables)

12 Months Ended

Dec. 31, 2015

Debt Instruments [Abstract]

Schedule of long-term debt

	December 31,
	2015			2014
Notes payable:	($ in millions)
Variable-rate Senior Term Loan facility, due 2020 (2.17% at December 31, 2015)	$	1,350.0		$	—
Variable-rate Sumitomo credit facility, due 2018 (1.77% at December 31, 2015)	800.0			—
Variable-rate Recovery Zone bonds, due 2024-2035 (1.40% and 1.31% at December 31, 2015 and 2014, respectively)	103.0			103.0
Variable-rate Go Zone bonds, due 2024 (1.40% and 1.31% at December 31, 2015 and 2014, respectively)	50.0			50.0
Variable-rate Industrial development and environmental improvement obligations, due 2025 (0.27% and 0.20% at December 31, 2015 and 2014, respectively)	2.9			2.9
Variable-rate Senior Term Loan facility, due 2019 (1.66% at December 31, 2014)	—			149.1
9.75%, due 2023	720.0			—
10.00%, due 2025	500.0			—
5.50%, due 2022	200.0			200.0
6.75%, due 2016 (includes interest rate swaps of $1.2 million and $3.7 million in 2015 and 2014, respectively)	126.2			128.7
7.23%, SunBelt Notes due 2013-2017 (includes unamortized fair value premium of $0.2 million and $0.5 million and interest rate swaps of $0.4 million and $0.8 million in 2015 and 2014, respectively)	25.0			37.8
Capital lease obligations	4.6			3.6
Deferred debt issuance costs	(32.9		)	(8.9		)
Total debt	3,848.8			666.2
Amounts due within one year	205.0			16.4
Total long-term debt	$	3,643.8		$	649.8

Swap activity related to certain debt obligations

The following table reflects the swap activity related to certain debt obligations:

Underlying Debt Instrument	Swap Amount		Date of Swap	December 31, 2015
	($ in millions)			Olin Pays Floating Rate:
6.75%, due 2016	$	65.0	March 2010	3.75 - 4.75%	(a)
6.75%, due 2016	$	60.0	March 2010	3.75 - 4.75%	(a)
				Olin Receives Floating Rate:
6.75%, due 2016	$	65.0	October 2011	3.75 - 4.75%	(a)
6.75%, due 2016	$	60.0	October 2011	3.75 - 4.75%	(a)

(a) Actual rate is set in arrears.  We project the rate will fall within the range shown.

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PENSION PLANS (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2016

Dec. 31, 2015

Compensation and Retirement Disclosure [Abstract]

Changes in benefit obligation and plan assets

Changes in the benefit obligation and plan assets were as follows:

	December 31, 2015									December 31, 2014
	($ in millions)									($ in millions)
Change in Benefit Obligation	U.S.			Foreign			Total			U.S.			Foreign			Total
Benefit obligation at beginning of year	$	2,116.5		$	66.3		$	2,182.8		$	1,916.5		$	62.2		$	1,978.7
Service cost	2.1			2.2			4.3			2.3			0.5			2.8
Interest cost	80.2			3.1			83.3			83.8			2.7			86.5
Actuarial (gain) loss	(45.8		)	1.8			(44.0		)	245.8			9.8			255.6
Benefits paid	(205.6		)	(2.8		)	(208.4		)	(131.9		)	(3.6		)	(135.5		)
Curtailments/settlements	12.6			0.1			12.7			—			0.2			0.2
Business combination	498.5			171.4			669.9			—			—			—
Currency translation adjustments	—			(14.7		)	(14.7		)	—			(5.5		)	(5.5		)
Benefit obligation at end of year	$	2,458.5		$	227.4		$	2,685.9		$	2,116.5		$	66.3		$	2,182.8

	December 31, 2015									December 31, 2014
	($ in millions)									($ in millions)
Change in Plan Assets	U.S.			Foreign			Total			U.S.			Foreign			Total
Fair value of plans’ assets at beginning of year	$	1,915.4		$	63.3		$	1,978.7		$	1,798.6		$	62.1		$	1,860.7
Actual return on plans’ assets	(25.4		)	0.4			(25.0		)	244.2			9.4			253.6
Employer contributions	77.6			1.0			78.6			4.5			0.9			5.4
Benefits paid	(205.6		)	(2.8		)	(208.4		)	(131.9		)	(3.6		)	(135.5		)
Business combination	212.0			10.8			222.8			—			—			—
Currency translation adjustments	—			(10.2		)	(10.2		)	—			(5.5		)	(5.5		)
Fair value of plans’ assets at end of year	$	1,974.0		$	62.5		$	2,036.5		$	1,915.4		$	63.3		$	1,978.7

	December 31, 2015									December 31, 2014
	($ in millions)									($ in millions)
Funded Status	U.S.			Foreign			Total			U.S.			Foreign			Total
Qualified plans	$	(480.8	)	$	(163.5	)	$	(644.3	)	$	(137.5	)	$	(1.2	)	$	(138.7	)
Non-qualified plans	(3.7		)	(1.4		)	(5.1		)	(63.6		)	(1.8		)	(65.4		)
Total funded status	$	(484.5	)	$	(164.9	)	$	(649.4	)	$	(201.1	)	$	(3.0	)	$	(204.1	)

Amounts recognized in consolidated balance sheets

Amounts recognized in the consolidated balance sheets consisted of:

	December 31, 2015									December 31, 2014
	($ in millions)									($ in millions)
	U.S.			Foreign			Total			U.S.			Foreign			Total
Accrued benefit in current liabilities	$	(0.4	)	$	(0.1	)	$	(0.5	)	$	(21.8	)	$	(0.3	)	$	(22.1	)
Accrued benefit in noncurrent liabilities	(484.1		)	(164.8		)	(648.9		)	(179.3		)	(2.7		)	(182.0		)
Accumulated other comprehensive loss	714.2			26.6			740.8			654.8			23.0			677.8
Net balance sheet impact	$	229.7		$	(138.3	)	$	91.4		$	453.7		$	20.0		$	473.7

Schedule of projected and accumulated benefit obligation, and fair value of plan assets

	December 31,
	2015		2014
	($ in millions)
Projected benefit obligation	$	2,685.9	$	2,182.8
Accumulated benefit obligation	2,655.0		2,170.8
Fair value of plan assets	2,036.5		1,978.7

Components of net periodic benefit income (loss)

	Pension Benefits						Other Postretirement Benefits
	Three Months Ended March 31,						Three Months Ended March 31,
	2016			2015			2016		2015
Components of Net Periodic Benefit (Income) Cost	($ in millions)
Service cost	$	3.2		$	1.6		$	0.3	$	0.3
Interest cost	22.4			20.6			0.5		0.6
Expected return on plans’ assets	(39.8		)	(35.6		)	—		—
Recognized actuarial loss	5.3			7.5			0.8		0.9
Curtailments/settlements	—			0.1			—		0.1
Net periodic benefit (income) cost	$	(8.9	)	$	(5.8	)	$	1.6	$	1.9

	Years Ended December 31,
	2015			2014			2013
Components of Net Periodic Benefit Costs (Income)	($ in millions)
Service cost	$	7.8		$	5.3		$	6.2
Interest cost	83.3			86.5			81.1
Expected return on plans’ assets	(147.4		)	(139.5		)	(137.5		)
Amortization of prior service cost	1.6			2.2			1.9
Recognized actuarial loss	26.2			20.3			27.8
Curtailments/settlements	47.2			0.2			—
Net periodic benefit costs (income)	$	18.7		$	(25.0	)	$	(20.5	)
Included in Other Comprehensive Loss (Pretax)
Liability adjustment	$	125.4		$	138.9		$	14.4
Amortization of prior service costs and actuarial losses	(62.4		)	(22.7		)	(29.7		)

Assumptions used in calculations

	U.S. Pension Benefits						Foreign Pension Benefits
Weighted-Average Assumptions	2015		2014		2013		2015		2014		2013
Discount rate—periodic benefit cost	3.9	%	4.5	%	3.9	%	2.8	%	4.8	%	4.2	%
Expected return on assets	7.75	%	7.75	%	7.75	%	6.0	%	7.5	%	7.75	%
Rate of compensation increase	3.0	%	3.0	%	3.0	%	3.0	%	3.5	%	3.5	%
Discount rate—benefit obligation	4.4	%	3.9	%	4.5	%	2.7	%	3.9	%	4.8	%

Schedule of Rate of Returns by Asset Class Considered in Setting Long-Term Rate of Return Assumption

The following rates of return by asset class were considered in setting the long-term rate of return assumption:

U.S. equities	9%	to	13%
Non-U.S. equities	10%	to	14%
Fixed income/cash	5%	to	9%
Alternative investments	5%	to	15%
Absolute return strategies	8%	to	12%

Pension plan asset allocation by asset class

Our pension plan asset allocation at December 31, 2015 and 2014, by asset class was as follows:

	Percentage of Plan Assets
Asset Class	2015		2014
U.S. equities	4	%	4	%
Non-U.S. equities	6	%	7	%
Fixed income/cash	47	%	52	%
Acquisition plan receivable	10	%	—	%
Alternative investments	19	%	21	%
Absolute return strategies	14	%	16	%
Total	100	%	100	%

Target allocation and ranges

As of December 31, 2015, the following target allocation and ranges have been set for each asset class:

Asset Class	Target Allocation		Target Range
U.S. equities	6	%	0-14
Non-U.S. equities	6	%	0-14
Fixed income/cash	61	%	48-80
Alternative investments	7	%	0-28
Absolute return strategies	20	%	10-30

Pension Plan Investments Measured At Fair Value [Text Block]

 The following table summarizes our domestic and foreign defined benefit pension plan assets measured at fair value as of December 31, 2015:

Asset Class	Quoted Prices In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	($ in millions)
Equity securities
U.S. equities	$	36.4	$	43.2	$	—	$	79.6
Non-U.S. equities	0.8		121.9		—		122.7
Acquisition plan receivable	—		—		212.0		212.0
Fixed income/cash
Cash	60.1		—		—		60.1
Government treasuries	—		425.6		2.0		427.6
Corporate debt instruments	0.3		301.9		12.0		314.2
Asset-backed securities	—		155.6		—		155.6
Alternative investments
Hedge fund of funds	—		—		335.6		335.6
Real estate funds	—		—		27.4		27.4
Private equity funds	—		—		18.4		18.4
Absolute return strategies	—		264.6		18.7		283.3
Total assets	$	97.6	$	1,312.8	$	626.1	$	2,036.5

The following table summarizes our domestic and foreign defined benefit pension plan assets measured at fair value as of December 31, 2014:

Asset Class	Quoted Prices In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	($ in millions)
Equity securities
U.S. equities	$	69.8	$	12.4	$	—	$	82.2
Non-U.S. equities	35.4		115.5		—		150.9
Fixed income/cash
Cash	65.7		—		—		65.7
Government treasuries	—		465.6		4.3		469.9
Corporate debt instruments	0.4		329.7		9.6		339.7
Asset-backed securities	—		150.5		—		150.5
Alternative investments
Hedge fund of funds	—		—		358.8		358.8
Real estate funds	—		—		34.0		34.0
Private equity funds	—		—		17.7		17.7
Absolute return strategies	—		289.0		20.3		309.3
Total assets	$	171.3	$	1,362.7	$	444.7	$	1,978.7

Summary of activity for defined benefit plan with significant unobservable inputs

The following table summarizes the activity for our defined benefit pension plans level 3 assets for the year ended December 31, 2015:

	December 31, 2014		Realized Gain/(Loss)		Unrealized Gain/(Loss) Relating to Assets Held at Period End			Purchases, Sales, Settlements, and Other			Transfers In/(Out)		December 31, 2015
	($ in millions)
Acquisition plan receivable	$	—	$	—	$	—		$	212.0		$	—	$	212.0
Fixed income/cash
Government treasuries	4.3		—		(0.7		)	(1.6		)	—		2.0
Corporate debt instruments	9.6		0.5		(0.2		)	2.1			—		12.0
Alternative investments
Hedge fund of funds	358.8		7.2		(3.4		)	(27.0		)	—		335.6
Real estate funds	34.0		2.4		3.7			(12.7		)	—		27.4
Private equity funds	17.7		0.2		0.8			(0.3		)	—		18.4
Absolute return strategies	20.3		—		(0.5		)	(1.1		)	—		18.7
Total level 3 assets	$	444.7	$	10.3	$	(0.3	)	$	171.4		$	—	$	626.1

The following table summarizes the activity for our defined benefit pension plans level 3 assets for the year ended December 31, 2014:

	December 31, 2013		Realized Gain/(Loss)		Unrealized Gain/(Loss) Relating to Assets Held at Period End			Purchases, Sales, Settlements, and Other			Transfers In/(Out)		December 31, 2014
	($ in millions)
Fixed income/cash
Government treasuries	$	4.5	$	—	$	(0.3	)	$	0.1		$	—	$	4.3
Corporate debt instruments	21.5		2.0		(1.3		)	(12.6		)	—		9.6
Alternative investments
Hedge fund of funds	315.9		—		17.9			25.0			—		358.8
Real estate funds	35.7		1.6		2.0			(5.3		)	—		34.0
Private equity funds	17.9		—		(0.2		)	—			—		17.7
Absolute return strategies	18.7		—		0.8			0.8			—		20.3
Total level 3 assets	$	414.2	$	3.6	$	18.9		$	8.0		$	—	$	444.7

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POSTRETIREMENT BENEFITS (Tables)

12 Months Ended

Dec. 31, 2015

POSTRETIREMENT BENEFITS Disclosure [Abstract]

Postretirement plan change in benefit obligation

Changes in the benefit obligation were as follows:

	December 31, 2015									December 31, 2014
	($ in millions)									($ in millions)
Change in Benefit Obligation	U.S.			Foreign			Total			U.S.			Foreign			Total
Benefit obligation at beginning of year	$	58.5		$	8.7		$	67.2		$	59.0		$	8.6		$	67.6
Service cost	1.1			0.1			1.2			1.0			0.1			1.1
Interest cost	2.0			0.3			2.3			2.3			0.4			2.7
Actuarial loss (gain)	(0.7		)	0.7			—			2.4			0.7			3.1
Benefits paid	(7.0		)	(0.3		)	(7.3		)	(6.2		)	(0.4		)	(6.6		)
Currency translation adjustments	—			(1.5		)	(1.5		)	—			(0.7		)	(0.7		)
Curtailment	—			0.1			0.1			—			—			—
Benefit obligation at end of year	$	53.9		$	8.1		$	62.0		$	58.5		$	8.7		$	67.2

	December 31, 2015									December 31, 2014
	($ in millions)									($ in millions)
	U.S.			Foreign			Total			U.S.			Foreign			Total
Funded status	$	(53.9	)	$	(8.1	)	$	(62.0	)	$	(58.5	)	$	(8.7	)	$	(67.2	)

Amounts recognized in consolidated balance sheet

Amounts recognized in the consolidated balance sheets consisted of:

	December 31, 2015									December 31, 2014
	($ in millions)									($ in millions)
	U.S.			Foreign			Total			U.S.			Foreign			Total
Accrued benefit in current liabilities	$	(5.3	)	$	(0.3	)	$	(5.6	)	$	(5.2	)	$	(0.3	)	$	(5.5	)
Accrued benefit in noncurrent liabilities	(48.6		)	(7.8		)	(56.4		)	(53.3		)	(8.4		)	(61.7		)
Accumulated other comprehensive loss	29.7			0.2			29.9			33.6			(0.4		)	33.2
Net balance sheet impact	$	(24.2	)	$	(7.9	)	$	(32.1	)	$	(24.9	)	$	(9.1	)	$	(34.0	)

Components of net periodic benefit cost

	Years Ended December 31,
	2015			2014			2013
Components of Net Periodic Benefit Cost	($ in millions)
Service cost	$	1.2		$	1.1		$	1.3
Interest cost	2.3			2.7			2.6
Amortization of prior service cost	—			(0.1		)	(0.1		)
Recognized actuarial loss	3.1			2.9			3.7
Curtailment	0.1			—			—
Net periodic benefit cost	$	6.7		$	6.6		$	7.5
Included in Other Comprehensive Loss (Pretax)
Liability adjustment	$	(0.1	)	$	3.1		$	(1.9	)
Amortization of prior service costs and actuarial losses	(3.2		)	(2.8		)	(3.6		)

Schedule of actuarial assumption

	December 31,
Weighted-Average Assumptions	2015		2014		2013
Discount rate—periodic benefit cost	3.7	%	4.3	%	3.6	%
Discount rate—benefit obligation	4.1	%	3.7	%	4.3	%

Assumed healthcare cost trend rates

The assumed healthcare cost trend rates for pre-65 retirees were as follows:

	December 31,
	2015		2014
Healthcare cost trend rate assumed for next year	8.5	%	8.5	%
Rate that the cost trend rate gradually declines to	5.0	%	5.0	%
Year that the rate reaches the ultimate rate	2022		2021

Effects of one percent change in the assumed health care cost trend rates

 A one-percentage-point change in assumed healthcare cost trend rates would have the following effects:

	One-Percentage Point Increase		One-Percentage Point Decrease
	($ in millions)
Effect on total of service and interest costs	$	0.2	$	(0.2	)
Effect on postretirement benefit obligation	3.1		(2.6		)

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INCOME TAXES (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2016

Dec. 31, 2015

Income Tax Disclosure [Abstract]

Components of income tax provision

	Years ended December 31,
	2015			2014			2013
Components of Income from Continuing Operations Before Taxes	($ in millions)
Domestic	$	(66.9	)	$	164.4		$	222.2
Foreign	73.6			(1.7		)	27.8
Income from continuing operations before taxes	$	6.7		$	162.7		$	250.0
Components of Income Tax Provision
Current expense (benefit):
Federal	$	(16.6	)	$	25.9		$	42.1
State	1.2			1.3			9.4
Foreign	14.4			5.3			8.5
	(1.0		)	32.5			60.0
Deferred expense (benefit):
Federal	$	8.9		$	26.9		$	10.4
State	(2.4		)	3.0			1.9
Foreign	2.6			(4.7		)	(0.9		)
	9.1			25.2			11.4
Income tax provision	$	8.1		$	57.7		$	71.4

Effective tax rate reconciliation

The following table accounts for the difference between the actual tax provision and the amounts obtained by applying the statutory U.S. federal income tax rate of 35.0% to income before taxes.

	Three Months Ended March 31,
Effective Tax Rate Reconciliation (Percent)	2016		2015
Statutory federal tax rate	35.0	%	35.0	%
Foreign rate differential	(3.8	)	(0.1	)
U.S. tax on foreign earnings	3.8		—
Domestic manufacturing/export tax incentive	—		(3.0	)
Salt Depletion	(3.4	)	(0.6	)
Dividends paid to CEOP	(0.6	)	(0.6	)
State income taxes, net	(1.4	)	0.6
Change in valuation allowance	0.1		1.0
Change in tax contingencies	1.6		—
Other, net	0.3		0.9
Effective tax rate	31.6	%	33.2	%

The following table accounts for the difference between the actual tax provision and the amounts obtained by applying the statutory U.S. federal income tax rate of 35% to the income from continuing operations before taxes.

	Years ended December 31,
Effective Tax Rate Reconciliation (Percent)	2015		2014		2013
Statutory federal tax rate	35.0	%	35.0	%	35.0	%
State income taxes, net	(38.2	)	2.4		2.3
Foreign rate differential	(129.8	)	0.4		(0.9	)
U.S. tax on foreign earnings	128.6		(0.6	)	0.8
Domestic manufacturing/export tax incentive	—		(1.8	)	(1.6	)
Salt depletion	(38.8	)	(0.5	)	(0.3	)
Non-deductible transaction costs	133.1		—		—
Change in valuation allowance	27.9		1.1		(2.1	)
Remeasurement of deferred taxes	7.6		0.4		0.1
Change in tax contingencies	5.0		(0.3	)	(3.8	)
Dividends paid to CEOP	(11.1	)	(0.5	)	(0.3	)
Return to provision	(4.2	)	(0.7	)	(0.1	)
Research tax credit	(3.1	)	—		(0.8	)
Other, net	8.9		0.6		0.3
Effective tax rate	120.9	%	35.5	%	28.6	%

Components of deferred tax assets and liabilities

	December 31,
Components of Deferred Tax Assets and Liabilities	2015			2014
	($ in millions)
Deferred tax assets:
Pension and postretirement benefits	$	235.2		$	108.0
Environmental reserves	55.3			56.5
Asset retirement obligations	21.0			22.9
Accrued liabilities	53.7			52.5
Tax credits	23.3			9.2
Federal and state net operating losses	40.1			3.3
Capital loss carryforward	4.7			4.8
Other miscellaneous items	18.5			10.0
Total deferred tax assets	451.8			267.2
Valuation allowance	(29.3		)	(16.6		)
Net deferred tax assets	422.5			250.6
Deferred tax liabilities:
Property, plant and equipment	875.6			174.5
Intangible amortization	138.4			14.2
Inventory and prepaids	11.6			4.5
Partnerships	101.4			97.8
Taxes on unremitted earnings	294.8			—
Total deferred tax liabilities	1,421.8			291.0
Net deferred tax liability	$	(999.3	)	$	(40.4	)

Summary of Valuation Allowance

The activity of our deferred income tax valuation allowance was as follows:

	December 31,
	2015			2014
	($ in millions)
Beginning balance	$	16.6		$	13.4
Charged to income tax provision	1.8			4.1
Acquisition activity	12.3			—
Deductions from reserves - credited to income tax provision	(1.4		)	(0.9		)
Ending balance	$	29.3		$	16.6

Unrecognized tax benefits

The amount of unrecognized tax benefits was as follows:

	March 31,
	2016			2015
	($ in millions)
Balance at beginning of year	$	35.1		$	36.1
Decreases for prior year tax positions	(1.6		)	—
Balance at end of period	$	33.5		$	36.1

The amounts of unrecognized tax benefits were as follows:

	December 31,
	2015			2014
	($ in millions)
Beginning balance	$	36.1		$	34.5
Increase for current year tax positions	—			2.2
Increase for prior year tax positions	0.2			0.2
Reductions due to statute of limitations	—			(0.4		)
Decrease for prior year tax positions	—			(0.3		)
Decrease due to tax settlements	(1.2		)	(0.1		)
Ending balance	$	35.1		$	36.1

Tax years subject to examination

For our primary tax jurisdictions, the tax years that remain subject to examination are as follows:

	Tax Years
U.S. federal income tax	2008; 2010 - 2015
U.S. state income tax	2006 - 2015
Canadian federal income tax	2012 - 2015
Brazil	2014 - 2015
Germany	2015
China	2014 - 2015
The Netherlands	2014 - 2015
South Korea	2014 - 2015
Hong Kong	2015

For our primary tax jurisdictions, the tax years that remain subject to examination are as follows:

	Tax Years
U.S. federal income tax	2008; 2010 - 2015
U.S. state income tax	2006 - 2014
Canadian federal income tax	2010 - 2014
Brazil	2014 - 2015
Germany	2015
China	2014 - 2015
The Netherlands	2014 - 2015
South Korea	2014 - 2015
Hong Kong	2015

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ACCRUED LIABILITIES (Tables)

12 Months Ended

Dec. 31, 2015

Accrued Liabilities, Current [Abstract]

Accrued Liabilities

Included in accrued liabilities were the following:

	December 31,
	2015		2014
	($ in millions)
Acquisition-related accruals	$	90.2	$	—
Accrued compensation and payroll taxes	53.4		40.4
Accrued interest	35.0		4.7
Legal and professional costs	32.0		26.3
Accrued employee benefits	24.4		41.5
Environmental (current portion only)	19.0		19.0
Asset retirement obligation (current portion only)	7.3		10.2
Other	66.8		72.2
Accrued liabilities	$	328.1	$	214.3

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STOCK-BASED COMPENSATION (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2016

Dec. 31, 2015

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,
		2016		2015
	($ in millions)
Stock-based compensation		$	4.4	$	2.5
Mark-to-market adjustments		0.4		5.2
Total expense		$	4.8	$	7.7

Stock-based compensation expense was as follows:

	Years ended December 31,
	2015			2014			2013
	($ in millions)
Stock-based compensation	$	11.5		$	9.2		$	13.3
Mark-to-market adjustments	(3.0		)	(3.6		)	4.2
Total expense	$	8.5		$	5.6		$	17.5

Stock Options Activity

Stock option transactions were as follows:

						Exercisable
	Shares		Option Price	Weighted-Average Option Price		Options	Weighted-Average Exercise Price
Outstanding at January 1, 2015	4,133,753		$14.28-27.64	$	20.14	2,976,870	$	18.50
Granted	776,750		27.40	27.40
Exercised	(147,608	)	14.28-25.57	20.11
Canceled	(42,790	)	23.28-27.40	25.14
Outstanding at December 31, 2015	4,720,105		$14.28-27.65	$	21.29	3,371,449	$	19.28

Stock Options Exercisable, Exercise Price Range

The following table provides certain information with respect to stock options exercisable at December 31, 2015:

Range of Exercise Prices	Options Exercisable	Weighted-Average Exercise Price		Options Outstanding	Weighted-Average Exercise Price
Under $16.00	916,046	$	15.05	916,046	$	15.05
$16.00 – $22.00	1,870,281	19.85		1,870,281	19.85
Over $22.00	585,122	24.11		1,933,778	25.65
	3,371,449			4,720,105

Common shares reserved and available for grant or purchase

At December 31, 2015, common shares reserved for issuance and available for grant or purchase under the following plans consisted of:

	Number of Shares
Stock Option Plans	Reserved for Issuance	Available for Grant or Purchase(1)
2000 long term incentive plan	277,586	2,911
2003 long term incentive plan	389,921	10,138
2006 long term incentive plan	1,591,479	168,783
2009 long term incentive plan	2,762,161	506,610
2014 long term incentive plan	3,000,000	2,009,000
Total under stock option plans	8,021,147	2,697,442

	Number of Shares
Stock Purchase Plans	Reserved for Issuance	Available for Grant or Purchase
1997 stock plan for non-employee directors	572,978	567,476
Employee deferral plan	45,627	45,623
Total under stock purchase plans	618,605	613,099

(1) All available to be issued as stock options, but includes a sub-limit for all types of stock awards of 1,420,442 shares.

Performance Shares Transactions

Performance share transactions were as follows:

	To Settle in Cash				To Settle in Shares
	Shares		Weighted-Average Fair Value per Share		Shares		Weighted-Average Fair Value per Share
Outstanding at January 1, 2015	290,917		$	23.04	281,000		$	23.46
Granted	126,000		27.40		126,000		27.40
Paid/Issued	(105,611	)	23.04		(101,000	)	21.92
Converted from shares to cash	2,111		24.42		(2,111	)	24.42
Canceled	(1,889	)	25.83		(1,889	)	26.49
Outstanding at December 31, 2015	311,528		$	17.48	302,000		$	25.59
Total vested at December 31, 2015	201,528		$	17.48	192,000		$	24.81

Summary of Unvested Performance Shares

The summary of the status of our unvested performance shares to be settled in cash were as follows:

	Shares		Weighted-Average Fair Value per Share
Unvested at January 1, 2015	87,334		$	23.04
Granted	126,000		27.40
Vested	(101,445	)	17.48
Canceled	(1,889	)	25.83
Unvested at December 31, 2015	110,000		$	17.48

Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]

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	2016			2015
Dividend yield	6.09		%	2.92		%
Risk-free interest rate	1.35		%	1.69		%
Expected volatility	32		%	34		%
Expected life (years)	6.0			6.0
Weighted average grant fair value (per option)	$	1.90		$	6.80
Weighted average exercise price	$	13.14		$	27.40
Shares granted	1,670,400			776,750

The fair value of each option granted, which typically vests ratably over three years, but not less than one year, was estimated on the date of grant, using the Black-Scholes option-pricing model with the following assumptions:

	2015			2014			2013
Dividend yield	2.92		%	3.13		%	3.44		%
Risk-free interest rate	1.69		%	2.13		%	1.35		%
Expected volatility	34		%	42		%	43		%
Expected life (years)	6.0			7.0			7.0
Weighted-average grant fair value (per option)	$	6.80		$	8.34		$	7.05
Weighted-average exercise price	$	27.40		$	25.69		$	23.28
Shares granted	776,750			624,200			621,000

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SHAREHOLDERS' EQUITY (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2016

Dec. 31, 2015

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 Postretirement Benefits (net of taxes)			Accumulated Other Comprehensive Loss
	($ in millions)
Balance at January 1, 2015	$	(2.3	)	$	(4.2	)	$	(436.6	)	$	(443.1	)
Unrealized losses	(1.4		)	(2.4		)	—			(3.8		)
Reclassification adjustments into income	—			1.9			8.6			10.5
Tax benefit (provision)	—			0.2			(3.5		)	(3.3		)
Net Change	(1.4		)	(0.3		)	5.1			3.4
Balance at March 31, 2015	$	(3.7	)	$	(4.5	)	$	(431.5	)	$	(439.7	)
Balance at January 1, 2016	$	(12.1	)	$	(6.9	)	$	(473.5	)	$	(492.5	)
Unrealized gains	24.0			1.1			—			25.1
Reclassification adjustments into income	—			3.7			6.1			9.8
Tax provision	(8.5		)	(1.8		)	(2.3		)	(12.6		)
Net Change	15.5			3.0			3.8			22.3
Balance at March 31, 2016	$	3.4		$	(3.9	)	$	(469.7	)	$	(470.2	)

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 Postretirement Benefits (net of taxes)			Accumulated Other Comprehensive Loss
	($ in millions)
Balance at January 1, 2013	$	2.1		$	4.7		$	(378.1	)	$	(371.3	)
Unrealized losses	(2.6		)	(7.7		)	(12.5		)	(22.8		)
Reclassification adjustments into income	—			1.4			33.3			34.7
Tax benefit (provision)	—			2.5			(8.2		)	(5.7		)
Net change	(2.6		)	(3.8		)	12.6			6.2
Balance at December 31, 2013	(0.5		)	0.9			(365.5		)	(365.1		)
Unrealized losses	(1.8		)	(10.2		)	(142.0		)	(154.0		)
Reclassification adjustments into income	—			1.8			25.5			27.3
Tax benefit	—			3.3			45.4			48.7
Net change	(1.8		)	(5.1		)	(71.1		)	(78.0		)
Balance at December 31, 2014	(2.3		)	(4.2		)	(436.6		)	(443.1		)
Unrealized losses	(15.7		)	(13.9		)	(125.3		)	(154.9		)
Reclassification adjustments into income	—			9.7			65.6			75.3
Tax benefit	5.9			1.5			22.8			30.2
Net change	(9.8		)	(2.7		)	(36.9		)	(49.4		)
Balance at December 31, 2015	$	(12.1	)	$	(6.9	)	$	(473.5	)	$	(492.5	)

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SEGMENT INFORMATION (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2016

Dec. 31, 2015

Segment Reporting [Abstract]

Segment Information

		Three Months Ended March 31,
		2016			2015
Sales:	($ in millions)
Chlor Alkali Products and Vinyls		$	704.3		$	339.3
Epoxy		460.2			—
Winchester		183.7			178.7
Total sales		$	1,348.2		$	518.0
Income (loss) before taxes:
Chlor Alkali Products and Vinyls		$	68.1		$	24.1
Epoxy		8.2			—
Winchester		28.7			29.8
Corporate/other:
Pension income		12.2			7.1
Environmental expense		(2.7		)	(0.7		)
Other corporate and unallocated costs		(29.6		)	(22.1		)
Restructuring charges		(92.8		)	(1.2		)
Acquisition-related costs		(10.2		)	(10.4		)
Other operating income (expense)		10.9			(0.2		)
Interest expense		(48.5		)	(7.1		)
Interest income		0.3			0.3
Income (loss) before taxes		$	(55.4	)	$	19.6

	Years ended December 31,
	2015			2014			2013
Sales:	($ in millions)
Chlor Alkali Products and Vinyls	$	1,713.4		$	1,502.8		$	1,737.4
Epoxy	429.6			—			—
Winchester	711.4			738.4			777.6
Total sales	$	2,854.4		$	2,241.2		$	2,515.0
Income (loss) from continuing operations before taxes:
Chlor Alkali Products and Vinyls	$	115.5		$	130.1		$	213.5
Epoxy	(7.5		)	—			—
Winchester	115.6			127.3			143.2
Corporate/Other	(40.8		)	(33.9		)	(62.6		)
Restructuring charges	(2.7		)	(15.7		)	(5.5		)
Acquisition-related costs	(123.4		)	(4.2		)	—
Other operating income	45.7			1.5			0.7
Interest expense	(97.0		)	(43.8		)	(38.6		)
Interest income	1.1			1.3			0.6
Other income (expense)	0.2			0.1			(1.3		)
Income from continuing operations before taxes	$	6.7		$	162.7		$	250.0
Earnings of non-consolidated affiliates:
Chlor Alkali Products and Vinyls	$	1.7		$	1.7		$	2.8
Depreciation and amortization expense:
Chlor Alkali Products and Vinyls	$	186.1		$	119.4		$	117.5
Epoxy	20.9			—			—
Winchester	17.4			16.3			14.9
Corporate/Other	4.5			3.4			2.9
Total depreciation and amortization expense	$	228.9		$	139.1		$	135.3
Capital spending:
Chlor Alkali Products and Vinyls	$	94.5		$	49.6		$	68.0
Epoxy	7.7			—			—
Winchester	25.6			21.4			21.2
Corporate/Other	3.1			0.8			1.6
Total capital spending	$	130.9		$	71.8		$	90.8

	December 31,
	2015		2014
Assets:	($ in millions)
Chlor Alkali Products and Vinyls	$	6,690.7	$	1,939.0
Epoxy	1,591.2		—
Winchester	411.9		361.0
Corporate/Other	595.1		389.2
Total assets	$	9,288.9	$	2,689.2
Investments—affiliated companies (at equity):
Chlor Alkali Products and Vinyls	$	25.0	$	23.3

Segment geographic data

	Years ended December 31,
Geographic Data	2015		2014		2013
Sales:	($ in millions)
United States	$	2,208.5	$	2,051.4	$	2,316.2
Foreign	645.9		189.8		198.8
Total sales	$	2,854.4	$	2,241.2	$	2,515.0

	December 31,
	2015		2014
Long-lived assets:	($ in millions)
United States	$	3,561.7	$	889.6
Foreign	391.7		41.4
Total long-lived assets	$	3,953.4	$	931.0

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ENVIRONMENTAL (Tables)

12 Months Ended

Dec. 31, 2015

Environmental Remediation Obligations [Abstract]

Rollforward of environmental liabilities

Our liabilities for future environmental expenditures were as follows:

	December 31,
	2015			2014
	($ in millions)
Beginning balance	$	138.3		$	144.6
Charges to income	15.7			9.6
Remedial and investigatory spending	(14.1		)	(14.9		)
Currency translation adjustments	(1.8		)	(1.0		)
Ending balance	$	138.1		$	138.3

Environmental Provisions Charged (Credited) to Income Table

Environmental provisions charged (credited) to income, which are included in cost of goods sold, were as follows:

	Years ended December 31,
	2015		2014			2013
	($ in millions)
Charges to income	$	15.7	$	9.6		$	11.5
Recoveries from third parties of costs incurred and expensed in prior periods	—		(1.4		)	(1.3		)
Total environmental expense	$	15.7	$	8.2		$	10.2

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COMMITMENTS AND CONTINGENCIES (Tables)

12 Months Ended

Dec. 31, 2015

Commitments and Contingencies Disclosure [Abstract]

Contractual commitments under non-cancelable operating leases and purchase contracts

The following table summarizes our contractual commitments under non-cancelable operating leases and purchase contracts as of December 31, 2015:

	Operating Leases		Purchase Commitments
	($ in millions)
2016	$	73.7	$	560.2
2017	60.9		506.4
2018	51.7		449.3
2019	39.5		442.1
2020	27.3		440.3
Thereafter	80.2		2,904.9
Total commitments	$	333.3	$	5,303.2

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DERIVATIVE FINANCIAL INSTRUMENTS (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2016

Dec. 31, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of derivative instruments

We had the following notional amount of outstanding commodity forward contracts that were entered into to hedge forecasted purchases:

	December 31,
	2015		2014
	($ in millions)
Copper	$	43.6	$	62.7
Zinc	8.7		6.8
Lead	9.3		14.1
Natural gas	2.0		5.7

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:

	Asset Derivatives										Liability Derivatives
		Fair Value										Fair Value
Derivatives Designated as Hedging Instruments	Balance Sheet Location	March 31, 2016			December 31, 2015			March 31, 2015			Balance Sheet Location	March 31, 2016			December 31, 2015			March 31, 2015
		($ in millions)										($ in millions)
Interest rate contracts	Other current assets	$	—		$	—		$	—		Current installments of long-term debt	$	0.6		$	1.2		$	—
Interest rate contracts	Other assets	—			—			—			Long-term debt	0.3			0.4			3.8
Commodity contracts – losses	Other current assets	—			—			—			Accrued liabilities	7.6			11.5			8.1
Commodity contracts – gains	Other current assets	—			—			—			Accrued liabilities	(1.0		)	(0.1		)	(0.5		)
		$	—		$	—		$	—			$	7.5		$	13.0		$	11.4
Derivatives Not Designated as Hedging Instruments
Interest rate contracts – gains	Other current assets	$	0.9		$	1.2		$	—		Accrued liabilities	$	—		$	—		$	—
Interest rate contracts – losses	Other current assets	(0.4		)	(0.1		)	—			Accrued liabilities	—			—			—
Interest rate contracts – gains	Other assets	—			—			3.9			Other liabilities	—			—			—
Interest rate contracts – losses	Other assets	—			—			(1.0		)	Other liabilities	—			—			—
Commodity contracts – losses	Other current assets	—			—			—			Accrued liabilities	0.1			0.2			1.2
Foreign exchange contracts – gains	Other current assets	0.4			0.1			—			Accrued liabilities	(0.3		)	—			—
Foreign exchange contracts – losses	Other current assets	(0.4		)	—			—			Accrued liabilities	1.8			—			—
		$	0.5		$	1.2		$	2.9			$	1.6		$	0.2		$	1.2
Total derivatives(1)		$	0.5		$	1.2		$	2.9			$	9.1		$	13.2		$	12.6

(1) Does not include the impact of cash collateral received from or provided to counterparties.

The following table summarizes the location and fair value of the derivative instruments on our consolidated 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:

	Asset Derivatives							Liability Derivatives
		Fair Value							Fair Value
		December 31,							December 31,
Derivatives Designated as Hedging Instruments	Balance Sheet Location	2015			2014			Balance Sheet Location	2015			2014
		($ in millions)							($ in millions)
Interest rate contracts	Other current assets	$	—		$	—		Current installments of long-term debt	$	1.2		$	—
Interest rate contracts	Other assets	—			—			Long-term debt	0.4			4.5
Commodity contracts – losses	Other current assets	—			—			Accrued liabilities	11.5			7.2
Commodity contracts – gains	Other current assets	—			—			Accrued liabilities	(0.1		)	(0.1		)
		$	—		$	—			$	13.0		$	11.6
Derivatives Not Designated as Hedging Instruments
Interest rate contracts – gains	Other current assets	$	1.2		$	—		Accrued liabilities	$	—		$	—
Interest rate contracts – losses	Other current assets	(0.1		)	—			Accrued liabilities	—			—
Interest rate contracts – gains	Other assets	—			4.3			Other liabilities	—			—
Interest rate contracts – losses	Other assets	—			(0.8		)	Other liabilities	—			—
Commodity contracts – losses	Other current assets	—			—			Accrued liabilities	0.2			1.5
Foreign exchange contracts – gains	Other current assets	0.1			—			Accrued liabilities	—			—
		$	1.2		$	3.5			$	0.2		$	1.5
Total derivatives(1)		$	1.2		$	3.5			$	13.2		$	13.1

(1) Does not include the impact of cash collateral received from or provided to counterparties.

Summary of effects of derivative instruments on consolidated statements of operations

The following table summarizes the effects of derivative instruments on our condensed statements of income:

			Amount of Gain (Loss)
			Three Months Ended March 31,
	Location of Gain (Loss)		2016			2015
Derivatives – Cash Flow Hedges		($ in millions)
Recognized in other comprehensive loss (effective portion)	———		$	1.1		$	(2.4	)
Reclassified from accumulated other comprehensive loss into income (effective portion)	Cost of goods sold		$	(3.7	)	$	(1.9	)
Derivatives – Fair Value Hedges
Interest rate contracts	Interest expense		$	0.7		$	0.7
Derivatives Not Designated as Hedging Instruments
Commodity contracts	Cost of goods sold		$	(0.4	)	$	(1.7	)
Foreign exchange contracts	Selling and administration		(3.1		)	—
			$	(3.5	)	$	(1.7	)

The following table summarizes the effects of derivative instruments on our consolidated statements of operations:

		Amount of Gain (Loss)
		Years Ended December 31,
	Location of Gain (Loss)	2015			2014			2013
Derivatives – Cash Flow Hedges		($ in millions)
Recognized in other comprehensive loss (effective portion)	———	$	(13.9	)	$	(10.2	)	$	(7.7	)
Reclassified from accumulated other comprehensive loss into income (effective portion)	Cost of goods sold	$	(9.7	)	$	(1.8	)	$	(1.4	)
Derivatives – Fair Value Hedges
Interest rate contracts	Interest expense	$	2.8		$	2.9		$	2.9
Derivatives Not Designated as Hedging Instruments
Commodity contracts	Cost of goods sold	$	(2.2	)	$	1.4		$	0.4
Foreign exchange contracts	Selling and administration	0.1			—			—
		$	(2.1	)	$	1.4		$	0.4

The ineffective portion of changes in fair value resulted in zero charged or credited to earnings for the years ended December 31, 2015, 2014 and 2013.

XML

FAIR VALUE MEASUREMENTS (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2016

Dec. 31, 2015

Fair Value Disclosures [Abstract]

Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]

The following table summarizes the assets and liabilities measured at fair value in the condensed balance sheets:

	Fair Value Measurements
Balance at March 31, 2016	Level 1		Level 2		Level 3		Total
Assets	($ in millions)
Interest rate swaps	$	—	$	0.5	$	—	$	0.5
Liabilities
Interest rate swaps	$	—	$	0.9	$	—	$	0.9
Commodity forward contracts	—		6.7		—		6.7
Foreign exchange contracts	—		1.5		—		1.5
Balance at December 31, 2015
Assets
Interest rate swaps	$	—	$	1.1	$	—	$	1.1
Foreign exchange contracts	—		0.1		—		0.1
Liabilities
Interest rate swaps	$	—	$	1.6	$	—	$	1.6
Commodity forward contracts	—		11.6		—		11.6
Balance at March 31, 2015
Assets
Interest rate swaps	$	—	$	2.9	$	—	$	2.9
Liabilities
Interest rate swaps	$	—	$	3.8	$	—	$	3.8
Commodity forward contracts	—		8.8		—		8.8

Fair Value, by Balance Sheet Grouping [Table Text Block]

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 on balance sheets
	Level 1		Level 2		Level 3		Total
	($ in millions)
Balance at March 31, 2016	$	—	$	3,778.5	$	153.0	$	3,931.5	$	3,833.0
Balance at December 31, 2015	—		3,826.9		153.0		3,979.9		3,848.8
Balance at March 31, 2015	—		538.7		153.0		691.7		665.1

The following table summarizes the assets and liabilities measured at fair value in the consolidated balance sheets:

Balance at December 31, 2015	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets	($ in millions)
Interest rate swaps	$	—	$	1.1	$	—	$	1.1
Foreign exchange contracts	—		0.1		—		0.1
Liabilities
Interest rate swaps	—		1.6		—		1.6
Commodity forward contracts	—		11.6		—		11.6
Balance at December 31, 2014
Assets
Interest rate swaps	$	—	$	3.5	$	—	$	3.5
Liabilities
Interest rate swaps	—		4.5		—		4.5
Commodity forward contracts	—		8.6		—		8.6

Activity summary of financial instruments measured at fair value using level 3 inputs

The following table summarizes the activity for our earn out liability measured at fair value using Level 3 inputs:

	December 31,
	2015		2014
	($ in millions)
Beginning balance	$	—	$	26.7
Settlements	—		(26.7		)
Ending balance	$	—	$	—

Fair Value Of Debt Table [Table Text Block]

The following table summarizes the fair value measurements of debt and the actual debt recorded on our balance sheets:

	Fair Value Measurements
	Level 1		Level 2		Level 3		Total		Amount recorded on balance sheets
	($ in millions)
Balance at December 31, 2015	$	—	$	3,826.9	$	153.0	$	3,979.9	$	3,848.8
Balance at December 31, 2014	—		531.9		153.0		684.9		666.2

XML

OTHER FINANCIAL DATA (Tables)

12 Months Ended

Dec. 31, 2015

Quarterly Financial Data [Abstract]

Quarterly Data (Unaudited)

2015	First Quarter		Second Quarter		Third Quarter		Fourth Quarter			Year
Sales	$	518.0	$	535.4	$	533.6	$	1,267.4		$	2,854.4
Cost of goods sold	433.2		445.5		460.0		1,148.1			2,486.8
Net income (loss)	13.1		42.3		5.9		(62.7		)	(1.4		)
Net income (loss) per common share:
Basic	0.17		0.55		0.08		(0.39		)	(0.01		)
Diluted	0.17		0.54		0.08		(0.39		)	(0.01		)
Common dividends per share	0.20		0.20		0.20		0.20			0.80
Market price of common stock(1)
High	34.34		32.56		27.18		22.13			34.34
Low	22.00		26.77		15.73		16.60			15.73

2014	First Quarter		Second Quarter		Third Quarter		Fourth Quarter		Year
Sales	$	577.4	$	570.4	$	593.6	$	499.8	$	2,241.2
Cost of goods sold	475.4		463.6		492.3		421.9		1,853.2
Income from continuing operations	29.5		36.6		26.1		12.8		105.0
Income from discontinued operations, net	—		0.7		—		—		0.7
Net income	29.5		37.3		26.1		12.8		105.7
Basic income per common share:
Income from continuing operations	0.37		0.46		0.33		0.16		1.33
Income from discontinued operations, net	—		0.01		—		—		0.01
Net income	0.37		0.47		0.33		0.16		1.34
Diluted income per common share:
Income from continuing operations	0.37		0.46		0.33		0.16		1.32
Income from discontinued operations, net	—		0.01		—		—		0.01
Net income	0.37		0.47		0.33		0.16		1.33
Common dividends per share	0.20		0.20		0.20		0.20		0.80
Market price of common stock(1)
High	29.18		29.28		28.08		25.97		29.28
Low	24.51		26.42		25.23		20.43		20.43

(1) NYSE composite transactions.

XML

SUPPLEMENTAL GUARANTOR FINANCIAL INFORMATION SUPPLEMENTAL GUARANTOR FINANCIAL INFORMATION (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2016

Dec. 31, 2015

Supplemental Guarantor Financial Information [Abstract]

Supplemental Guarantor Financial Information Balance Sheets

CONDENSED CONSOLIDATING BALANCE SHEETS
March 31, 2016
(In millions)
(Unaudited)
	Parent Guarantor			Issuer		Subsidiary Non-Guarantor			Eliminations			Total
Assets
Current assets:
Cash and cash equivalents	$	19.8		$	—	$	295.8		$	—		$	315.6
Receivables, net	119.3			—		693.9			—			813.2
Intercompany receivables	—					1,498.9			(1,498.9		)	—
Income taxes receivable	35.3			—		1.0			—			36.3
Inventories	173.3			—		506.2			—			679.5
Current deferred income taxes	—			—		2.6			(2.6		)	—
Other current assets	150.7			5.0		6.2			(129.1		)	32.8
Total current assets	498.4			5.0		3,004.6			(1,630.6		)	1,877.4
Property, plant and equipment, net	501.4			—		3,357.6			—			3,859.0
Investment in Subsidiaries	5,970.8			3,675.2		—			(9,646.0		)	—
Deferred income taxes	170.8			—		—			(63.4		)	107.4
Other assets	42.8			—		421.0			—			463.8
Long-term receivables—affiliates	—			2,553.2		—			(2,553.2		)
Intangible assets, net	0.1			—		663.1			—			663.2
Goodwill	—			985.4		1,160.7			—			2,146.1
Total assets	$	7,184.3		$	7,218.8	$	8,607.0		$	(13,893.2	)	$	9,116.9
Liabilities and Shareholders' Equity
Current liabilities:
Current installments of long-term debt	$	192.9		$	—	$	12.2		$	—		$	205.1
Accounts payable	45.9			—		432.2			—			478.1
Intercompany payables	1,459.5			39.4		—			(1,498.9		)	—
Income taxes payable	2.5			—		14.2			(2.6		)	14.1
Accrued liabilities	267.8			—		213.6			(129.1		)	352.3
Total current liabilities	1,968.6			39.4		672.2			(1,630.6		)	1,049.6
Long-term debt	1,067.7			2,547.8		12.4			—			3,627.9
Accrued pension liability	182.4			—		452.8			—			635.2
Deferred income taxes	8.6			189.7		892.7			—			1,091.0
Long-term payables—affiliates	1,291.8			281.7		979.7			(2,553.2		)	—
Other liabilities	292.4			—		111.4			(63.4		)	340.4
Total liabilities	4,811.5			3,058.6		3,121.2			(4,247.2		)	6,744.1
Commitments and contingencies
Shareholders' equity:
Common stock	165.2			—		14.6			(14.6		)	165.2
Additional paid-in capital	2,238.9			4,146.1		4,790.3			(8,936.4		)	2,238.9
Accumulated other comprehensive loss	(470.2		)	—		(7.2		)	7.2			(470.2		)
Retained earnings	438.9			14.1		688.1			(702.2		)	438.9
Total shareholders' equity	2,372.8			4,160.2		5,485.8			(9,646.0		)	2,372.8
Total liabilities and shareholders' equity	$	7,184.3		$	7,218.8	$	8,607.0		$	(13,893.2	)	$	9,116.9

CONDENSED CONSOLIDATING BALANCE SHEETS
December 31, 2015
(In millions)
	Parent Guarantor			Issuer			Subsidiary Non-Guarantor			Eliminations			Total
Assets
Current assets:
Cash and cash equivalents	$	119.4		$	—		$	272.6		$	—		$	392.0
Receivables, net	107.7			—			679.4			(3.7		)	783.4
Intercompany receivables	—			—			995.0			(995.0		)	—
Income taxes receivable	34.6			—			1.5			(3.2		)	32.9
Inventories	166.0			—			519.2			—			685.2
Current deferred income taxes	—			—			2.7			(2.7		)
Other current assets	152.1			5.0			4.6			(121.8		)	39.9
Total current assets	579.8			5.0			2,475.0			(1,126.4		)	1,933.4
Property, plant and equipment, net	508.7			—			3,444.7			—			3,953.4
Investment in Subsidiaries	5,905.0			3,636.3			—			(9,541.3		)	—
Deferred income taxes	—			—			104.6			(8.7		)	95.9
Other assets	43.5			—			411.1			—			454.6
Long-term receivables—affiliates	—			2,562.6			—			(2,562.6		)	—
Intangible assets, net	0.5			—			677.0			—			677.5
Goodwill	—			990.2			1,183.9			—			2,174.1
Total assets	$	7,037.5		$	7,194.1		$	8,296.3		$	(13,239.0	)	$	9,288.9
Liabilities and Shareholders' Equity
Current liabilities:
Current installments of long-term debt	$	192.8		$	—		$	12.2		$	—		$	205.0
Accounts payable	36.1			—			576.6			(4.5		)	608.2
Intercompany payables	966.0			29.0			—			(995.0		)	—
Income taxes payable	2.7			—			8.1			(5.9		)	4.9
Accrued liabilities	227.8			—			221.3			(121.0		)	328.1
Total current liabilities	1,425.4			29.0			818.2			(1,126.4		)	1,146.2
Long-term debt	1,084.0			2,547.4			12.4			—			3,643.8
Accrued pension liability	484.3			—			164.6			—			648.9
Deferred income taxes	32.5			189.7			881.7			(8.7		)	1,095.2
Long-term payables—affiliates	1,296.4			286.5			979.7			(2,562.6		)	—
Other liabilities	296.1			—			39.9			—			336.0
Total liabilities	4,618.7			3,052.6			2,896.5			(3,697.7		)	6,870.1
Commitments and contingencies
Shareholders' equity:
Common stock	165.1			—			14.6			(14.6		)	165.1
Additional paid-in capital	2,236.4			4,146.1			4,789.6			(8,935.7		)	2,236.4
Accumulated other comprehensive loss	(492.5		)	—			(31.7		)	31.7			(492.5		)
Retained earnings	509.8			(4.6		)	627.3			(622.7		)	509.8
Total shareholders' equity	2,418.8			4,141.5			5,399.8			(9,541.3		)	2,418.8
Total liabilities and shareholders' equity	$	7,037.5		$	7,194.1		$	8,296.3		$	(13,239.0	)	$	9,288.9

CONDENSED CONSOLIDATING BALANCE SHEETS
March 31, 2015
(In millions)
(Unaudited)
	Parent Guarantor			Issuer		Subsidiary Non-Guarantor			Eliminations			Total
Assets
Current assets:
Cash and cash equivalents	$	179.2		$	—	$	17.6		$	—		$	196.8
Receivables, net	130.0			—		173.8			—			303.8
Intercompany receivables	—			—		622.7			(622.7		)	—
Income taxes receivable	15.1			—		—			—			15.1
Inventories	149.1			—		67.0			—			216.1
Current deferred income taxes	42.6			—		11.4			—			54.0
Other current assets	111.9			—		2.2			(96.7		)	17.4
Total current assets	627.9			—		894.7			(719.4		)	803.2
Property, plant and equipment, net	503.7			—		416.2			—			919.9
Investment in Subsidiaries	1,694.2			—		—			(1,694.2		)	—
Deferred income taxes	64.1			—		—			(51.2		)	12.9
Other assets	60.1			—		10.1			—			70.2
Intangible assets, net	0.5			—		119.3			—			119.8
Goodwill	—			—		747.1			—			747.1
Total assets	$	2,950.5		$	—	$	2,187.4		$	(2,464.8	)	$	2,673.1
Liabilities and Shareholders' Equity
Current liabilities:
Current installments of long-term debt	$	4.2		$	—	$	12.2		$	—		$	16.4
Accounts payable	60.7			—		87.7			(0.6		)	147.8
Intercompany payables	622.7					—			(622.7		)	—
Income taxes payable	1.1			—		—			—			1.1
Accrued liabilities	135.5			—		165.7			(96.1		)	205.1
Total current liabilities	824.2			—		265.6			(719.4		)	370.4
Long-term debt	623.9			—		24.8			—			648.7
Accrued pension liability	165.0			—		2.2			—			167.2
Deferred income taxes	—			—		158.5			(51.2		)	107.3
Other liabilities	319.2			—		42.1			—			361.3
Total liabilities	1,932.3			—		493.2			(770.6		)	1,654.9
Commitments and contingencies
Shareholders' equity:
Common stock	77.5			—		14.6			(14.6		)	77.5
Additional paid-in capital	792.1			—		1,221.3			(1,221.3		)	792.1
Accumulated other comprehensive loss	(439.7		)	—		(20.1		)	20.1			(439.7		)
Retained earnings	588.3			—		478.4			(478.4		)	588.3
Total shareholders' equity	1,018.2			—		1,694.2			(1,694.2		)	1,018.2
Total liabilities and shareholders' equity	$	2,950.5		$	—	$	2,187.4		$	(2,464.8	)	$	2,673.1

CONDENSED CONSOLIDATING BALANCE SHEETS
December 31, 2015
(In millions)
	Parent Guarantor		Issuer		Subsidiary Non-Guarantor		Eliminations			Total
Assets
Current assets:
Cash and cash equivalents	$	119.4	$	—	$	272.6	$	—		$	392.0
Receivables, net	107.7		—		679.4		(3.7		)	783.4
Intercompany receivables	—		—		995.0		(995.0		)	—
Income taxes receivable	34.6		—		1.5		(3.2		)	32.9
Inventories	166.0		—		519.2		—			685.2
Current deferred income taxes	—		—		2.7		(2.7		)
Other current assets	152.1		5.0		4.6		(121.8		)	39.9
Total current assets	579.8		5.0		2,475.0		(1,126.4		)	1,933.4
Property, plant and equipment, net	508.7		—		3,444.7		—			3,953.4
Investment in Subsidiaries	5,905.0		3,636.3		—		(9,541.3		)	—
Deferred income taxes	—		—		104.6		(8.7		)	95.9
Other assets	43.5		—		411.1		—			454.6
Long-term receivables—affiliates	—		2,562.6		—		(2,562.6		)	—
Intangible assets, net	0.5		—		677.0		—			677.5
Goodwill	—		990.2		1,183.9		—			2,174.1
Total assets	$	7,037.5	$	7,194.1	$	8,296.3	$	(13,239.0	)	$	9,288.9
Liabilities and Shareholders' Equity
Current liabilities:
Current installments of long-term debt	$	192.8	$	—	$	12.2	$	—		$	205.0
Accounts payable	36.1		—		576.6		(4.5		)	608.2
Intercompany payables	966.0		29.0		—		(995.0		)	—
Income taxes payable	2.7		—		8.1		(5.9		)	4.9
Accrued liabilities	227.8		—		221.3		(121.0		)	328.1
Total current liabilities	1,425.4		29.0		818.2		(1,126.4		)	1,146.2
Long-term debt	1,084.0		2,547.4		12.4		—			3,643.8
Accrued pension liability	484.3		—		164.6		—			648.9
Deferred income taxes	32.5		189.7		881.7		(8.7		)	1,095.2
Long-term payables—affiliates	1,296.4		286.5		979.7		(2,562.6		)	—

Other liabilities	296.1			—			39.9			—			336.0
Total liabilities	4,618.7			3,052.6			2,896.5			(3,697.7		)	6,870.1
Commitments and contingencies
Shareholders' equity:
Common stock	165.1			—			14.6			(14.6		)	165.1
Additional paid-in capital	2,236.4			4,146.1			4,789.6			(8,935.7		)	2,236.4
Accumulated other comprehensive loss	(492.5		)	—			(31.7		)	31.7			(492.5		)
Retained earnings	509.8			(4.6		)	627.3			(622.7		)	509.8
Total shareholders' equity	2,418.8			4,141.5			5,399.8			(9,541.3		)	2,418.8
Total liabilities and shareholders' equity	$	7,037.5		$	7,194.1		$	8,296.3		$	(13,239.0	)	$	9,288.9

CONDENSED CONSOLIDATING BALANCE SHEETS
December 31, 2014
(In millions)
	Parent Guarantor			Issuer		Subsidiary Non-Guarantor			Eliminations			Total
Assets
Current assets:
Cash and cash equivalents	$	239.4		$	—	$	17.4		$	—		$	256.8
Receivables, net	107.3			—		155.8			—			263.1
Intercompany receivables	—					617.1			(617.1		)	—
Income taxes receivable	21.4			—		0.2			—			21.6
Inventories	136.1			—		74.0			—			210.1
Current deferred income taxes	41.9			—		12.3			—			54.2
Other current assets	99.0			—		1.9			(90.6		)	10.3
Total current assets	645.1			—		878.7			(707.7		)	816.1
Property, plant and equipment, net	505.3			—		425.7			—			931.0
Investment in Subsidiaries	1,683.9			—		—			(1,683.9		)	—
Deferred income taxes	61.2			—		—			(48.7		)	12.5
Other assets	48.4			—		10.6			—			59.0
Intangible assets, net	0.5			—		123.0			—			123.5
Goodwill	—			—		747.1			—			747.1
Total assets	$	2,944.4		$	—	$	2,185.1		$	(2,440.3	)	$	2,689.2
Liabilities and Shareholders' Equity
Current liabilities:
Current installments of long-term debt	$	4.2		$	—	$	12.2		$	—		$	16.4
Accounts payable	54.0			—		93.4			(0.6		)	146.8
Intercompany payables	617.1					—			(617.1		)	—
Income taxes payable	0.2			—		—			—			0.2
Accrued liabilities	137.0			—		167.3			(90.0		)	214.3
Total current liabilities	812.5			—		272.9			(707.7		)	377.7
Long-term debt	624.9			—		24.9			—			649.8
Accrued pension liability	179.1			—		2.9			—			182.0
Deferred income taxes	—			—		155.8			(48.7		)	107.1
Other liabilities	314.6			—		44.7			—			359.3
Total liabilities	1,931.1			—		501.2			(756.4		)	1,675.9
Commitments and contingencies
Shareholders' equity:
Common stock	77.4			—		14.6			(14.6		)	77.4
Additional paid-in capital	788.3			—		1,221.2			(1,221.2		)	788.3
Accumulated other comprehensive loss	(443.1		)	—		(19.0		)	19.0			(443.1		)
Retained earnings	590.7			—		467.1			(467.1		)	590.7
Total shareholders' equity	1,013.3			—		1,683.9			(1,683.9		)	1,013.3
Total liabilities and shareholders' equity	$	2,944.4		$	—	$	2,185.1		$	(2,440.3	)	$	2,689.2

Supplemental Guarantor Financial Information Statement of Operations

CONDENSED CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS
Three Months Ended March 31, 2016
(In millions)
(Unaudited)
	Parent Guarantor			Issuer			Subsidiary Non-Guarantor			Eliminations			Total
Sales	$	320.7		$	—		$	1,141.3		$	(113.8	)	$	1,348.2
Operating expenses:
Cost of goods sold	275.3			—			1,013.9			(113.8		)	1,175.4
Selling and administration	36.8			—			51.3			—			88.1
Restructuring charges	0.3			—			92.5			—			92.8
Acquisition-related costs	10.2			—			—			—			10.2
Other operating (loss) income	(0.5		)	—			11.4			—			10.9
Operating (loss) income	(2.4		)	—			(5.0		)	—			(7.4		)
Earnings of non-consolidated affiliates	0.2			—			—			—			0.2
Equity income (loss) in subsidiaries	(28.8		)	43.6			—			(14.8		)	—
Interest expense	10.7			38.2			1.0			(1.4		)	48.5
Interest income	0.8			—			0.9			(1.4		)	0.3
Income (loss) before taxes	(40.9		)	5.4			(5.1		)	(14.8		)	(55.4		)
Income tax (benefit) provision	(3.0		)	(13.3		)	(1.2		)	—			(17.5		)
Net income (loss)	$	(37.9	)	$	18.7		$	(3.9	)	$	(14.8	)	$	(37.9	)

CONDENSED CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS
Three Months Ended March 31, 2015
(In millions)
(Unaudited)
	Parent Guarantor			Issuer		Subsidiary Non-Guarantor		Eliminations			Total
Sales	$	323.1		$	—	$	289.4	$	(94.5	)	$	518.0
Operating expenses:
Cost of goods sold	274.7			—		253.0		(94.5		)	433.2
Selling and administration	35.3			—		11.7		—			47.0
Restructuring charges	—			—		1.2		—			1.2
Acquisition-related costs	10.4			—		—		—			10.4
Other operating (loss) income	(0.6		)	—		0.4		—			(0.2		)
Operating income	2.1			—		23.9		—			26.0
Earnings of non-consolidated affiliates	0.4			—		—		—			0.4
Equity income (loss) in subsidiaries	15.1			—		—		(15.1		)	—
Interest expense	7.9			—		0.5		(1.3		)	7.1
Interest income	0.8			—		0.8		(1.3		)	0.3
Income (loss) before taxes	10.5			—		24.2		(15.1		)	19.6
Income tax provision	(2.6		)	—		9.1		—			6.5
Net income (loss)	$	13.1		$	—	$	15.1	$	(15.1	)	$	13.1

CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS
Year Ended December 31, 2015
(In millions)
	Parent Guarantor			Issuer			Subsidiary Non-Guarantor			Eliminations			Total
Sales	$	1,215.4		$	—		$	2,002.5		$	(363.5	)	$	2,854.4
Operating expenses:
Cost of goods sold	1,057.8			—			1,792.5			(363.5		)	2,486.8
Selling and administration	110.4			—			76.1			—			186.5
Restructuring charges	0.7			—			2.0			—			2.7
Acquisition-related costs	117.9			—			5.5			—			123.4
Other operating (loss) income	(4.0		)	—			49.7			—			45.7
Operating (loss) income	(75.4		)	—			176.1			—			100.7
Earnings of non-consolidated affiliates	1.7			—			—			—			1.7
Equity income (loss) in subsidiaries	90.2			19.7			—			(109.9		)	—
Interest expense	60.9			37.0			4.5			(5.4		)	97.0
Interest income	3.1			—			3.4			(5.4		)	1.1
Other income (expense)	0.4			—			(0.2		)	—			0.2
Income (loss) before taxes	(40.9		)	(17.3		)	174.8			(109.9		)	6.7
Income tax provision (benefit)	(39.5		)	(12.8		)	60.3			—			8.1
Net income (loss)	$	(1.4	)	$	(4.6	)	$	114.5		$	(109.9	)	$	(1.4	)

CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS
Year Ended December 31, 2014
(In millions)
	Parent Guarantor		Issuer		Subsidiary Non-Guarantor		Eliminations			Total
Sales	$	1,373.2	$	—	$	1,285.5	$	(417.5	)	$	2,241.2
Operating expenses:					—
Cost of goods sold	1,148.1		—		1,122.6		(417.5		)	1,853.2
Selling and administration	90.8		—		75.4		—			166.2
Restructuring charges	4.8		—		10.9		—			15.7
Acquisition-related costs	4.2		—		—		—			4.2
Other operating income	0.9		—		0.6		—			1.5
Operating income	126.2		—		77.2		—			203.4
Earnings of non-consolidated affiliates	1.7		—		—		—			1.7
Equity income (loss) in subsidiaries	48.8		—		—		(48.8		)	—
Interest expense	47.0		—		1.3		(4.5		)	43.8
Interest income	2.5		—		3.3		(4.5		)	1.3
Other income	0.1		—		—		—			0.1
Income (loss) from continuing operations before taxes	132.3		—		79.2		(48.8		)	162.7
Income tax provision	27.3		—		30.4		—			57.7
Income (loss) from continuing operations	105.0		—		48.8		(48.8		)	105.0
Income from discontinued operations, net	0.7		—		—		—			0.7
Net income (loss)	$	105.7	$	—	$	48.8	$	(48.8	)	$	105.7

CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS
Year Ended December 31, 2013
(In millions)
	Parent Guarantor			Issuer		Subsidiary Non-Guarantor			Eliminations			Total
Sales	$	1,379.4		$	—	$	1,569.6		$	(434.0	)	$	2,515.0
Operating expenses:						—
Cost of goods sold	1,159.3			—		1,308.4			(434.0		)	2,033.7
Selling and administration	132.8			—		57.2			—			190.0
Restructuring charges	5.5			—		—			—			5.5
Acquisition-related costs	—			—		—			—			—
Other operating income	0.6			—		0.1			—			0.7
Operating income	82.4			—		204.1			—			286.5
Earnings of non-consolidated affiliates	2.8			—		—			—			2.8
Equity income (loss) in subsidiaries	129.8			—		—			(129.8		)	—
Interest expense	37.8			—		7.9			(7.1		)	38.6
Interest income	4.4			—		3.3			(7.1		)	0.6
Other (expense) income	(0.1		)	—		(1.2		)	—			(1.3		)
Income (loss) before taxes	181.5			—		198.3			(129.8		)	250.0
Income tax provision	2.9			—		68.5			—			71.4
Net income (loss)	$	178.6		$	—	$	129.8		$	(129.8	)	$	178.6

Supplemental Guarantor Financial Information Statements Of Comprehensive Income

CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME
Three Months Ended March 31, 2016
(In millions)
(Unaudited)
	Parent Guarantor			Issuer		Subsidiary Non-Guarantor			Eliminations			Total
Net income (loss)	$	(37.9	)	$	18.7	$	(3.9	)	$	(14.8	)	$	(37.9	)
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments, net	15.5			—		15.5			(15.5		)	15.5
Unrealized losses on derivative contracts, net	3.0			—		—			—			3.0
Amortization of prior service costs and actuarial losses, net	3.8			—		0.5			(0.5		)	3.8
Total other comprehensive income (loss), net of tax	22.3			—		16.0			(16.0		)	22.3
Comprehensive income (loss)	$	(15.6	)	$	18.7	$	12.1		$	(30.8	)	$	(15.6	)

CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME
Three Months Ended March 31, 2015
(In millions)
(Unaudited)
	Parent Guarantor			Issuer		Subsidiary Non-Guarantor			Eliminations			Total
Net (loss) income	$	13.1		$	—	$	15.1		$	(15.1	)	$	13.1
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments, net	(1.4		)	—		(1.4		)	1.4			(1.4		)
Unrealized losses on derivative contracts, net	(0.3		)	—		—			—			(0.3		)
Amortization of prior service costs and actuarial losses, net	5.1			—		0.4			(0.4		)	5.1
Total other comprehensive (loss) income, net of tax	3.4			—		(1.0		)	1.0			3.4
Comprehensive (loss) income	$	16.5		$	—	$	14.1		$	(14.1	)	$	16.5

CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME
Year Ended December 31, 2015
(In millions)
	Parent Guarantor			Issuer			Subsidiary Non-Guarantor			Eliminations			Total
Net income (loss)	$	(1.4	)	$	(4.6	)	$	114.5		$	(109.9	)	$	(1.4	)
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments, net	(9.8		)	—			(9.8		)	9.8			(9.8		)
Unrealized losses on derivative contracts, net	(2.7		)	—			—			—			(2.7		)
Pension and postretirement liability adjustments, net	(78.8		)	—			(5.1		)	5.1			(78.8		)
Amortization of prior service costs and actuarial losses, net	41.9			—			2.3			(2.3		)	41.9
Total other comprehensive (loss) income, net of tax	(49.4		)	—			(12.6		)	12.6			(49.4		)
Comprehensive (loss) income	$	(50.8	)	$	(4.6	)	$	101.9		$	(97.3	)	$	(50.8	)

CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME
Year Ended December 31, 2014
(In millions)
	Parent Guarantor			Issuer		Subsidiary Non-Guarantor			Eliminations			Total
Net income (loss)	$	105.7		$	—	$	48.8		$	(48.8	)	$	105.7
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments, net	(1.8		)	—		(1.8		)	1.8			(1.8		)
Unrealized losses on derivative contracts, net	(5.1		)	—		—			—			(5.1		)
Pension and postretirement liability adjustments, net	(86.6		)	—		(3.2		)	3.2			(86.6		)
Amortization of prior service costs and actuarial losses, net	15.5			—		1.4			(1.4		)	15.5
Total other comprehensive (loss) income, net of tax	(78.0		)	—		(3.6		)	3.6			(78.0		)
Comprehensive income (loss)	$	27.7		$	—	$	45.2		$	(45.2	)	$	27.7

CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME
Year Ended December 31, 2013
(In millions)
	Parent Guarantor			Issuer		Subsidiary Non-Guarantor			Eliminations			Total
Net income (loss)	$	178.6		$	—	$	129.8		$	(129.8	)	$	178.6
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net	(2.6		)	—		(2.6		)	2.6			(2.6		)
Unrealized losses on derivative contracts, net	(3.8		)	—		—			—			(3.8		)
Pension and postretirement liability adjustments, net	(7.7		)	—		(1.4		)	1.4			(7.7		)
Amortization of prior service costs and actuarial losses, net	20.3			—		1.1			(1.1		)	20.3
Total other comprehensive income (loss), net of tax	6.2			—		(2.9		)	2.9			6.2
Comprehensive income (loss)	$	184.8		$	—	$	126.9		$	(126.9	)	$	184.8

Supplemental Guarantor Financial Information Statements Of Cash Flows

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS
Three Months Ended March 31, 2016
(In millions)
(Unaudited)
	Parent Guarantor			Issuer		Subsidiary Non-Guarantor			Eliminations	Total
Net operating activities	$	(35.5	)	—		$	82.5		—	$	47.0
Investing Activities
Capital expenditures	(16.2		)	—		(59.9		)	—	(76.1		)
Proceeds from disposition of property, plant and equipment	—			—		0.1			—	0.1
Distributions from affiliated companies, net	2.2			—		—			—	2.2
Net investing activities	(14.0		)	—		(59.8		)	—	(73.8		)
Financing Activities
Long-term debt repayments	(0.2		)	(16.9	)	—			—	(17.1		)
Dividends paid	(33.0		)	—		—			—	(33.0		)
Intercompany financing activities	(16.9		)	16.9		—			—	—
Net financing activities	(50.1		)	—		—			—	(50.1		)
Effect of exchange rate changes on cash and cash equivalents	—			—		0.5			—	0.5
Net (decrease) increase in cash and cash equivalents	(99.6		)	—		23.2			—	(76.4		)
Cash and cash equivalents, beginning of year	119.4			—		272.6			—	392.0
Cash and cash equivalents, end of year	$	19.8		—		$	295.8		—	$	315.6

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS
Three Months Ended March 31, 2015
(In millions)
(Unaudited)
	Parent Guarantor			Issuer		Subsidiary Non-Guarantor			Eliminations		Total
Net operating activities	$	(15.5	)	$	—	$	5.9		$	—	$	(9.6	)
Investing Activities
Capital expenditures	(18.6		)	—		(4.7		)	—		(23.3		)
Proceeds from disposition of property, plant and equipment	0.2			—		0.4			—		0.6
Distributions from affiliated companies, net	2.2			—		—			—		2.2
Other investing activities	—			—		(1.4		)	—		(1.4		)
Net investing activities	(16.2		)	—		(5.7		)	—		(21.9		)
Financing Activities
Long-term debt repayments	(1.0		)	—		—			—		(1.0		)
Stock options exercised	2.0			—		—			—		2.0
Excess tax benefits from stock-based compensation	0.3			—		—			—		0.3
Dividends paid	(15.5		)	—		—			—		(15.5		)
Debt and equity issuance costs	(14.3		)	—		—			—		(14.3		)
Net financing activities	(28.5		)	—		—			—		(28.5		)
Net (decrease) increase in cash and cash equivalents	(60.2		)	—		0.2			—		(60.0		)
Cash and cash equivalents, beginning of year	239.4			—		17.4			—		256.8
Cash and cash equivalents, end of year	$	179.2		$	—	$	17.6		$	—	$	196.8

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS
Year Ended December 31, 2015
(In millions)
	Parent Guarantor			Issuer			Subsidiary Non-Guarantor			Eliminations		Total
Net operating activities	$	(70.6	)	$	—		$	287.7		$	—	$	217.1
Investing Activities
Capital expenditures	(74.0		)	—			(56.9		)	—		(130.9		)
Business acquired and related transactions, net of cash acquired	(408.1		)	—			—			—		(408.1		)
Proceeds from disposition of property, plant and equipment	1.7			—			24.5			—		26.2
Distributions from affiliated companies, net	8.8			—			—			—		8.8
Net investing activities	(471.6		)	—			(32.4		)	—		(504.0		)
Financing Activities
Long-term debt:
Borrowings	1,275.0			—			—			—		1,275.0
Repayments	(149.5		)	—			(581.2		)	—		(730.7		)
Stock options exercised	2.2			—			—			—		2.2
Excess tax benefits from stock-based compensation	0.4			—			—			—		0.4
Dividends paid	(79.5		)	—			—			—		(79.5		)
Debt and equity issuance costs	(35.2		)	(10.0		)	—			—		(45.2		)
Intercompany financing activities	(591.2		)	10.0			581.2					—
Net financing activities	422.2			—			—			—		422.2
Effect of exchange rate changes on cash and cash equivalents	—			—			(0.1		)	—		(0.1		)
Net (decrease) increase in cash and cash equivalents	(120.0		)	—			255.2			—		135.2
Cash and cash equivalents, beginning of year	239.4			—			17.4			—		256.8
Cash and cash equivalents, end of year	$	119.4		$	—		$	272.6		$	—	$	392.0

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS
Year Ended December 31, 2014
(In millions)
	Parent Guarantor			Issuer		Subsidiary Non-Guarantor			Eliminations		Total
Net operating activities	$	134.7		$	—	$	24.5		$	—	$	159.2
Investing Activities
Capital expenditures	(51.3		)	—		(20.5		)	—		(71.8		)
Proceeds from disposition of property, plant and equipment	3.5			—		2.1			—		5.6
Restricted cash activity, net	4.2			—		—			—		4.2
Other investing activities	—			—		0.3			—		0.3
Net investing activities	(43.6		)	—		(18.1		)	—		(61.7		)
Financing Activities
Long-term debt:
Borrowings	150.0			—		—			—		150.0
Repayments	(150.2		)	—		(12.2		)	—		(162.4		)
Earn out payment - SunBelt	—			—		(14.8		)	—		(14.8		)
Common stock repurchased and retired	(64.8		)	—		—			—		(64.8		)
Stock options exercised	6.6			—		—			—		6.6
Excess tax benefits from stock-based compensation	1.1			—		—			—		1.1
Dividends paid	(63.0		)	—		—			—		(63.0		)
Debt and equity issuance costs	(1.2		)	—		—			—		(1.2		)
Intercompany financing activities	(27.0		)			27.0					—
Net financing activities	(148.5		)	—		—			—		(148.5		)
Net (decrease) increase in cash and cash equivalents	(57.4		)	—		6.4			—		(51.0		)
Cash and cash equivalents, beginning of year	296.8			—		11.0			—		307.8
Cash and cash equivalents, end of year	$	239.4		$	—	$	17.4		$	—	$	256.8

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS
Year Ended December 31, 2013
(In millions)
	Parent Guarantor			Issuer	Subsidiary Non-Guarantor			Eliminations			Total
Net operating activities	$	336.9		—	$	(19.9	)	$	—		$	317.0
Investing Activities
Capital expenditures	(63.6		)	—	(27.2		)	—			(90.8		)
Proceeds from sale/leaseback of equipment	—			—	35.8			—			35.8
Proceeds from disposition of property, plant and equipment	3.7			—	0.9			—			4.6
Distributions from affiliated companies, net	1.5			—	—			—			1.5
Distributions from consolidated subsidiaries, Net	7.9			—	—			(7.9		)	—
Restricted cash activity, net	7.7			—	—			—			7.7
Other investing activities	—			—	(2.6		)	—			(2.6		)
Net investing activities	(42.8		)	—	6.9			(7.9		)	(43.8		)
Financing Activities
Long-term debt repayments	(11.5		)	—	(12.2		)	—			(23.7		)
Earn out payment - SunBelt	—			—	(17.1		)	—			(17.1		)
Common stock repurchased and retired	(36.2		)	—	—			—			(36.2		)
Stock options exercised	8.8			—	—			—			8.8
Excess tax benefits from stock-based compensation	1.6			—	—			—			1.6
Dividends paid	(64.0		)	—	(7.9		)	7.9			(64.0		)
Intercompany financing activities	(29.3		)		29.3						—
Net financing activities	(130.6		)	—	(7.9		)	7.9			(130.6		)
Net increase (decrease) in cash and cash equivalents	163.5			—	(20.9		)	—			142.6
Cash and cash equivalents, beginning of year	133.3			—	31.9			—			165.2
Cash and cash equivalents, end of year	$	296.8		—	$	11.0		—			$	307.8

XML

ACCOUNTING POLICIES (Detail Textuals) $ in Millions		3 Months Ended	12 Months Ended
	Oct. 05, 2015 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Feb. 28, 2011
Business Combination, Separately Recognized Transactions [Line Items]
Gain in Other Operating Income due to Insurance Recoveries at Becancour			$ 42.3
Gain in Other Operating Income due to Insurance Recoveries at McIntosh			3.7
Expense for earnout liability					$ 7.9
Business Acquisition, Percentage of Voting Interests Acquired						50.00%
Gain (Loss) on Sale of Equity Investments			0.0	$ 0.0	6.5
Asset retirement obligation non-current			46.2	44.2
Asset Retirement Obligation, Revision of Estimate			3.1	2.0
Goodwill and Intangible Asset Impairment			0.0	$ 0.0	$ 0.0
Up-front payments under the ethylene agreements	$ 433.5
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Ethylene Asset	$ 410.8
Amortization of Supply Contracts		$ 4.3	$ 4.3
Average remaining life expectancy of the inactive participants in the defined benefit pension plan (in years)			19	18
Minimum
Business Combination, Separately Recognized Transactions [Line Items]
Q4 2017 Supply Contract Payment			$ 230.0
Q4 2020 Supply Contract Payment			425.0
Maximum
Business Combination, Separately Recognized Transactions [Line Items]
Q4 2017 Supply Contract Payment			250.0
Q4 2020 Supply Contract Payment			$ 465.0

XML

ACCOUNTING POLICIES (Details 1) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Component of Operating Income [Abstract]
(Losses) gains on disposition of property, plant and equipment		$ (0.6)	$ 0.2	$ (1.1)
Gains on Disposition of Former Manufacturing Facilities		0.0	0.0	1.5
Gain in Other Operating Income due to Insurance Recoveries		46.0	0.0	0.0
Gain on resolution of a contract matter		0.0	1.0	0.0
Misc Other Operating Income		0.3	0.3	0.3
Other operating income	$ 10.9	$ 45.7	$ 1.5	$ 0.7

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ACCOUNTING POLICIES (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Asset retirement obligation [Roll Forward]
Beginning balance	$ 54.4	$ 60.8
Accretion	3.6	3.5
Spending	(8.2)	(11.2)
Currency translation adjustments	(1.1)	(0.7)
Acquisition activity	1.7	0.0
Adjustments	3.1	2.0
Ending balance	$ 53.5	$ 54.4

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ACCOUNTING POLICIES (Details 3) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Components of other assets [Abstract]
Investments in non-consolidated affiliates	$ 25.2	$ 25.0	$ 23.7	$ 23.3
Deferred debt issuance costs	3.1	3.3	15.1	1.4
Long term receivable from the sale of an equity method investment	0.0	0.0	5.8	7.8
Income tax receivable	1.5	1.5	6.6	6.6
Interest rate swaps	0.0	0.0	2.9	3.5
Supply contracts	402.2	406.5	0.0	0.0
Other	18.9	18.3	16.1	16.4
Other assets	$ 463.8	$ 454.6	$ 70.2	$ 59.0

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ACCOUNTING POLICIES (Details 4) - $ / shares	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted vesting period (in years)			3 years
Black-Sholes assumptions [Abstract]
Dividend yield (in hundredths)	6.09%	2.92%	2.92%	3.13%	3.44%
Risk-free interest rate (in hundredths)	1.35%	1.69%	1.69%	2.13%	1.35%
Expected volatility (in hundredths)	32.00%	34.00%	34.00%	42.00%	43.00%
Fair Value Assumptions, Expected Term, Simplified Method	6.0	6.0
Expected life (years)			6 years	7 years	7 years
Grant fair value (in dollars per share)	$ 1.90	$ 6.80	$ 6.80	$ 8.34	$ 7.05
Exercise price (in dollars per share)	$ 13.14	$ 27.40	$ 27.40	$ 25.69	$ 23.28
Shares granted (in shares)	1,670,400	776,750	776,750	624,200	621,000
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted vesting period (in years)			3 years
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted vesting period (in years)			1 year

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RECENT ACCOUNTING PRONOUNCEMENTS RECENT ACCOUNTING PRONOUNCEMENTS (Detail Textuals) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Other Asset to Long Term Debt [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 31.4	$ 8.9
Other Asset to Short Term Debt [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 1.5	$ 0.0

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ACQUISITION (Details Textuals) - USD ($) shares in Millions			3 Months Ended									12 Months Ended
	Oct. 05, 2015	Oct. 05, 2015	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Nov. 05, 2015	Nov. 03, 2015	Oct. 01, 2015	Jun. 23, 2015	Mar. 26, 2015	Jun. 24, 2014	Jun. 23, 2014
Business Acquisition [Line Items]
Business Combination, Acquisition Related Costs General			$ 10,200,000				$ 10,400,000					$ 76,300,000
Financing Fees							400,000					30,500,000
Change in Control Mandatory Acceleration of Expenses Under the Non-Qualified Pension Plan												47,100,000
Sales			1,348,200,000	$ 1,267,400,000	$ 533,600,000	$ 535,400,000	518,000,000	$ 499,800,000	$ 593,600,000	$ 570,400,000	$ 577,400,000	2,854,400,000	$ 2,241,200,000	$ 2,515,000,000
Net (loss) income			(55,400,000)				19,600,000					6,700,000	162,700,000	250,000,000
Goodwill			$ 2,146,100,000	2,174,100,000			747,100,000	$ 747,100,000				2,174,100,000	$ 747,100,000	747,100,000
Cash and Debt Distribution from Spinco	$ 2,095,000,000	$ 2,095,000,000
2023 Senior Notes	720,000,000	720,000,000
2025 Senior Notes	500,000,000	500,000,000
Delayed-Draw Term Loan Facility of Spinco																		$ 1,050,000,000
Delayed-Draw Term Loan Facility of Spinco, Amount Drawn	875,000,000	875,000,000
Senior Credit Facility																		1,850,000,000		$ 415,000,000
Line of Credit Facility, Maximum Borrowing Capacity																		500,000,000		$ 265,000,000	$ 265,000,000
Delayed-Draw Term Loan Facility, Maximum Borrowing Capacity																		1,350,000,000
Delayed-Draw Term Loan Facility, Amount Drawn	475,000,000	475,000,000
Combined Senior Credit Facility	1,850,000,000	1,850,000,000		$ 1,850,000,000								1,850,000,000
Combined Delayed Draw Term Loan Facility Amount Drawn	1,350,000,000	1,350,000,000
Subfacility of Senior Credit Facility																		$ 100,000,000
Annual Required Principal Payment (Percent) in Years 1 and 2																		5.00%
Annual Required Principal Payment (Percent) in Year 3																		7.50%
Annual Required Principal Payment (Percent) in Years 4 and 5																		10.00%
Sumitomo Credit Facility	600,000,000	600,000,000
Sumitomo Credit Facility Amendment																$ 200,000,000
Sumitomo Credit Facility Amendment Borrowing															$ 200,000,000
Bridge Financing Commitments																			$ 3,354,500,000
Bridge Financing Amortized Debt Issuance Costs							$ 14,300,000					$ 30,000,000
Accrual for future payments	90,200,000	90,200,000
Up-front payments under the ethylene agreements	433,500,000
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Ethylene Asset	$ 410,800,000	$ 410,800,000
Common stock, authorized (in shares)			240.0	240.0	120.0		120.0	120.0				240.0	120.0				240.0
DCP Business
Business Acquisition [Line Items]
Shares	87.5	87.5
Percentage of Outstanding Common Stock Acquired by Third Party	53.00%	53.00%
Percentage of Outstanding Common Stock Retained by Existing Stockholders	47.00%	47.00%
Change in Control Mandatory Acceleration of Expenses Under the Non-Qualified Pension Plan												$ 47,100,000
Sales							$ 1,439,000,000					5,681,800,000	$ 6,948,200,000
Net (loss) income							(39,500,000)					(36,400,000)	2,400,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	$ 25,400,000	$ 25,400,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory	477,100,000	477,100,000
Business Acquisition, Purchase Price Allocation, Current Assets, Receivables	416,000,000	416,000,000
Business Acquisition Contracted Receivables Acquired	420,600,000	420,600,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt	51,100,000	51,100,000
Goodwill	1,398,700,000	1,398,700,000
Business Acquisition, Goodwill, Expected Tax Deductible Amount	0	0
Accrual for future payments	69,500,000	69,500,000
Up-front payments under the ethylene agreements		433,500,000
Pro Forma Adjustment For Acquisition Related Costs							10,400,000					47,000,000	4,200,000
Pro Forma Adjustment For Fair Value Adjustment Inventory												24,000,000
Epoxy Segment
Business Acquisition [Line Items]
Sales			$ 460,200,000				0					429,600,000	0	0
Net (loss) income			8,200,000				0					(7,500,000)	0	0
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest from DCP Business			8,200,000
Goodwill			291,300,000	$ 296,600,000			0	$ 0				296,600,000	0	0
Chlor Alkali Products and Vinyls Segment
Business Acquisition [Line Items]
Sales			704,300,000				339,300,000					1,713,400,000	1,502,800,000	1,737,400,000
Net (loss) income			68,100,000				24,100,000					115,500,000	130,100,000	213,500,000
Revenue, Net from DCP Business			395,900,000									373,000,000
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest from DCP Business			56,300,000									37,200,000
Goodwill			1,854,800,000	$ 1,877,500,000			$ 747,100,000	$ 747,100,000				$ 1,877,500,000	$ 747,100,000	$ 747,100,000
2023 Notes
Business Acquisition [Line Items]
2023 Senior Notes	$ 720,000,000	$ 720,000,000
Interest rate	9.75%	9.75%		9.75%				0.00%				9.75%	0.00%
2025 Notes
Business Acquisition [Line Items]
2025 Senior Notes	$ 500,000,000	$ 500,000,000
Interest rate	10.00%	10.00%		10.00%				0.00%				10.00%	0.00%
Minimum
Business Acquisition [Line Items]
Q4 2017 Supply Contract Payment												$ 230,000,000
Q4 2020 Supply Contract Payment												425,000,000
2017 Supply Contract Payment			205,000,000
2020 Supply Contract Payment			425,000,000
Maximum
Business Acquisition [Line Items]
Q4 2017 Supply Contract Payment												250,000,000
Q4 2020 Supply Contract Payment												$ 465,000,000
2017 Supply Contract Payment			215,000,000
2020 Supply Contract Payment			$ 465,000,000
Initial Valuation [Member] | DCP Business
Business Acquisition [Line Items]
Shares	87.5
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory	$ 477,100,000	$ 477,100,000
Business Acquisition, Purchase Price Allocation, Current Assets, Receivables	418,900,000	418,900,000
Business Acquisition Contracted Receivables Acquired	423,500,000	423,500,000
Goodwill	1,427,500,000	1,427,500,000
Accrual for future payments	90,200,000	$ 90,200,000
Up-front payments under the ethylene agreements	$ 433,500,000

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ACQUISITION ACQUISITION (Details 1) $ / shares in Units, shares in Millions, $ in Millions	Oct. 05, 2015 USD ($) $ / shares shares	Oct. 05, 2015 USD ($) $ / shares shares
Schedule of Aggregate Purchase Consideration [Line Items]
Accrual for future payments	$ 90.2	$ 90.2
Up-front payments under the ethylene agreements	433.5
Long-term debt assumed	$ 569.0	$ 569.0
DCP Business
Schedule of Aggregate Purchase Consideration [Line Items]
Shares | shares	87.5	87.5
Value of common stock on October 2, 2015 | $ / shares	$ 17.46	$ 17.46
Equity consideration by exchange of shares	$ 1,527.4	$ 1,527.4
Cash and debt instruments received by TDCC		2,095.0
Accrual for future payments	69.5	69.5
Up-front payments under the ethylene agreements		433.5
Total cash, debt and equity consideration		4,125.4
Long-term debt assumed	569.0	569.0
Pension liabilities assumed	$ 442.3	442.3
Aggregate purchase price		$ 5,136.7
Initial Valuation [Member] | DCP Business
Schedule of Aggregate Purchase Consideration [Line Items]
Shares | shares	87.5
Value of common stock on October 2, 2015 | $ / shares	$ 17.46	$ 17.46
Equity consideration by exchange of shares	$ 1,527.4	$ 1,527.4
Cash and debt instruments received by TDCC	2,095.0
Accrual for future payments	90.2	90.2
Up-front payments under the ethylene agreements	433.5
Total cash, debt and equity consideration	4,146.1
Long-term debt assumed	569.0	569.0
Pension liabilities assumed	447.1	$ 447.1
Aggregate purchase price	$ 5,162.2

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ACQUISITION (Details 2) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015	Oct. 05, 2015	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Goodwill	$ 2,146.1	$ 2,174.1		$ 747.1	$ 747.1	$ 747.1
DCP Business
Business Acquisition [Line Items]
Total current assets			$ 918.8
Property, plant and equipment			3,090.8
Deferred taxes			76.8
Intangible assets			582.3
Other assets			432.7
Total assets acquired			5,101.4
Total current liabilities			351.4
Other liabilities			8.2
Total liabilities assumed			2,374.7
Net identifiable assets acquired			2,726.7
Goodwill			1,398.7
Fair value of net assets acquired			4,125.4
Long-term debt			517.9
Accrued pension liability			442.3
Deferred tax liability			1,054.9
Initial Valuation [Member] | DCP Business
Business Acquisition [Line Items]
Total current assets			921.7
Property, plant and equipment			3,090.8
Deferred taxes			76.8
Intangible assets			582.3
Other assets			426.5
Total assets acquired			5,098.1
Total current liabilities			357.6
Other liabilities			2.0
Total liabilities assumed			2,379.5
Net identifiable assets acquired			2,718.6
Goodwill			1,427.5
Fair value of net assets acquired			4,146.1
Long-term debt			517.9
Accrued pension liability			447.1
Deferred tax liability			1,054.9
Measurement Period Adjustments [Member] | DCP Business
Business Acquisition [Line Items]
Total current assets			(2.9)
Property, plant and equipment			0.0
Deferred taxes			0.0
Intangible assets			0.0
Other assets			6.2
Total assets acquired			3.3
Total current liabilities			(6.2)
Other liabilities			6.2
Total liabilities assumed			(4.8)
Net identifiable assets acquired			8.1
Goodwill			(28.8)
Fair value of net assets acquired			(20.7)
Long-term debt			0.0
Accrued pension liability			(4.8)
Deferred tax liability			$ 0.0

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ACQUISITION ACQUISITION (Details 3) - DCP Business - USD ($) $ in Millions		12 Months Ended
	Oct. 05, 2015	Dec. 31, 2015
Acquired Indefinite-lived Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 582.3
Intangible assets	$ 582.3
Customers, customer contracts and relationships
Acquired Indefinite-lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	15 years	15 years
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 490.3
Acquired Technology
Acquired Indefinite-lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	7 years	7 years
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 85.0
Trade Names
Acquired Indefinite-lived Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 7.0

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ACQUISITION (Details 4) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended									12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Sales	$ 1,348.2	$ 1,267.4	$ 533.6	$ 535.4	$ 518.0	$ 499.8	$ 593.6	$ 570.4	$ 577.4	$ 2,854.4	$ 2,241.2	$ 2,515.0
Net (loss) income	$ (55.4)				19.6					6.7	162.7	$ 250.0
DCP Business
Business Acquisition [Line Items]
Sales					1,439.0					5,681.8	6,948.2
Net (loss) income					$ (39.5)					$ (36.4)	$ 2.4
Pro Forma Earnings Per Share, Basic					$ (0.24)					$ (0.22)	$ 0.01
Pro Forma Earnings Per Share, Diluted					$ (0.24)					$ (0.22)	$ 0.01

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RESTRUCTURING CHARGES (Detail Textuals) $ in Millions		3 Months Ended			12 Months Ended			13 Months Ended	16 Months Ended	62 Months Ended	65 Months Ended
	Mar. 31, 2016 USD ($)	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2015 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Mar. 31, 2016 USD ($)	Mar. 21, 2016 T	Dec. 12, 2014 T	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 09, 2010 T
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 92.8	$ 1.2		$ 2.7	$ 15.7	$ 5.5			$ 77.3	$ 129.5
Restructuring and Related Cost, Incurred Cost										37.3	23.8
Restructuring Reserve, Settled without Cash										32.5	84.6
Accrued Restructuring Costs	$ 20.5	20.5	12.9	$ 15.7	6.7	15.7	10.2	$ 6.7	$ 20.5	6.7	20.5			$ 13.9
Chlor Alkali Products and Vinyls Capacity Reductions [Member]
Restructuring Cost and Reserve [Line Items]
Total Product Segment Production Capacity Decrease | T												433,000
Restructuring charges	92.2
Additional restructuring and related expected cost	45.0	45.0							45.0		45.0
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
Chlor Alkali Products Becancour
Restructuring Cost and Reserve [Line Items]
Tonnage reduction in chlor alkali manufacturing capacity (in tons) | T													185,000
Restructuring charges		0.3	1.2	$ 10.0	2.0			12.0	12.3
Additional restructuring and related expected cost	4.0	4.0			4.0			4.0	4.0	4.0	4.0
Chlor Alkali Products Mercury
Restructuring Cost and Reserve [Line Items]
Restructuring charges						3.8	3.7			40.6
Previous mercury cell capacity tonnage at Charleston, TN facility (in tons) | T																260,000
Membrane capacity tonnage capacity at Charleston, TN facility (in tons) | T																200,000
Winchester Segment
Restructuring Cost and Reserve [Line Items]
Restructuring charges		0.3	$ 0.1		0.7	$ 1.9	$ 1.8			24.7	25.0
Additional restructuring and related expected cost	0.7	0.7			1.0			1.0	0.7	1.0	0.7
Estimated Project Cost For Plant Relocation	110.0	110.0			110.0			110.0	110.0	110.0	110.0
Estimated Capital Spending For Facility Relocation	$ 80.0	80.0			80.0			$ 80.0	$ 80.0	$ 80.0	$ 80.0
Government Grants for Facility Relocation Capital Spending															$ 31.0
Winchester Segment | Minimum
Restructuring Cost and Reserve [Line Items]
Forecast to reduce Winchester's annual operating costs		35.0			35.0
Winchester Segment | Maximum
Restructuring Cost and Reserve [Line Items]
Forecast to reduce Winchester's annual operating costs		$ 40.0			$ 40.0

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RESTRUCTURING CHARGES (Details 1) - USD ($) $ in Millions	3 Months Ended		12 Months Ended			62 Months Ended	65 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Mar. 31, 2016	Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 20.5	$ 12.9	$ 6.7	$ 15.7	$ 10.2	$ 6.7	$ 20.5	$ 13.9
Restructuring charges	92.8	1.2	2.7	15.7	5.5	77.3	129.5
Amounts utilized	(79.2)	(3.3)	(10.9)	(10.2)	(9.2)
Restructuring Reserve, Translation Adjustment	0.2	(0.7)	(0.8)
Employee severance and job related benefits
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	6.9	8.0	4.6	11.2	10.2	4.6	6.9	13.5
Restructuring charges	3.9	0.0	0.0	4.5	0.4	21.4	19.7
Amounts utilized	(1.7)	(2.8)	(6.0)	(3.5)	(3.7)
Restructuring Reserve, Translation Adjustment	0.1	(0.4)	(0.6)
Pension and other postretirement benefits curtailment
Restructuring Cost and Reserve [Line Items]
Restructuring charges						4.1	4.1
Lease and other contract termination costs
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	11.3	4.9	2.1	4.5	0.0	2.1	11.3	0.4
Restructuring charges	9.2	0.7	0.7	4.5	(0.4)	5.9	14.4
Amounts utilized	(0.1)	0.0	(2.9)	0.0	0.0
Restructuring Reserve, Translation Adjustment	0.1	(0.3)	(0.2)
Employee relocation cost
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	0.0	0.0	0.0	0.0		0.0	0.0
Restructuring charges	0.2	0.1					5.5
Amounts utilized	(0.2)	(0.1)
Restructuring Reserve, Translation Adjustment	0.0	0.0
Employee relocation costs
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve			0.0	0.0	0.0	0.0		0.0
Restructuring charges			0.6	0.5	0.6	6.2
Amounts utilized			(0.6)	(0.5)	(0.6)
Restructuring Reserve, Translation Adjustment			0.0
Facility exit costs (asset retirement obligations)
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	2.3	0.0	0.0	0.0	0.0	0.0	2.3	0.0
Restructuring charges	2.9	0.2	0.9	2.9	4.9	18.4	5.7
Amounts utilized	(0.6)	(0.2)	(0.9)	(2.9)	(4.9)
Restructuring Reserve, Translation Adjustment	0.0	0.0	0.0
Write-off of equipment and facility
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	0.0	0.0	0.0	0.0	0.0	0.0	0.0	$ 0.0
Restructuring charges	76.6	0.2	0.5	3.3	0.0	$ 21.3	$ 80.1
Amounts utilized	(76.6)	(0.2)	(0.5)	$ (3.3)	$ 0.0
Restructuring Reserve, Translation Adjustment	$ 0.0	$ 0.0	$ 0.0

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RESTRUCTURING CHARGES (Details 2) - USD ($) $ in Millions		3 Months Ended			12 Months Ended			13 Months Ended	16 Months Ended	62 Months Ended	65 Months Ended
	Mar. 31, 2016	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 92.8	$ 1.2		$ 2.7	$ 15.7	$ 5.5			$ 77.3	$ 129.5
Write-off of equipment and facility
Restructuring Cost and Reserve [Line Items]
Restructuring charges		76.6	0.2		0.5	3.3	0.0			21.3	80.1
Employee severance and job related benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges		3.9	0.0		0.0	4.5	0.4			21.4	19.7
Facility exit costs (asset retirement obligations)
Restructuring Cost and Reserve [Line Items]
Restructuring charges		2.9	0.2		0.9	2.9	4.9			18.4	5.7
Pension and other postretirement benefits curtailment
Restructuring Cost and Reserve [Line Items]
Restructuring charges										4.1	4.1
Employee relocation cost
Restructuring Cost and Reserve [Line Items]
Restructuring charges		0.2	0.1								5.5
Employee relocation costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges					0.6	0.5	0.6			6.2
Lease and other contract termination costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges		9.2	0.7		0.7	4.5	(0.4)			5.9	14.4
Chlor Alkali Products Becancour
Restructuring Cost and Reserve [Line Items]
Restructuring charges		0.3	1.2	$ 10.0	2.0			$ 12.0	$ 12.3
Chlor Alkali Products Becancour | Write-off of equipment and facility
Restructuring Cost and Reserve [Line Items]
Restructuring charges								3.5	3.5
Chlor Alkali Products Becancour | Employee severance and job related benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges								2.7	2.7
Chlor Alkali Products Becancour | Facility exit costs (asset retirement obligations)
Restructuring Cost and Reserve [Line Items]
Restructuring charges								0.6	0.9
Chlor Alkali Products Becancour | Pension and other postretirement benefits curtailment
Restructuring Cost and Reserve [Line Items]
Restructuring charges								0.0	0.0
Chlor Alkali Products Becancour | Employee relocation cost
Restructuring Cost and Reserve [Line Items]
Restructuring charges									0.0
Chlor Alkali Products Becancour | Employee relocation costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges								0.0
Chlor Alkali Products Becancour | Lease and other contract termination costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges								$ 5.2	$ 5.2
Chlor Alkali Products and Vinyls Capacity Reductions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 92.2
Chlor Alkali Products and Vinyls Capacity Reductions [Member] | Write-off of equipment and facility
Restructuring Cost and Reserve [Line Items]
Restructuring charges	76.6
Chlor Alkali Products and Vinyls Capacity Reductions [Member] | Employee severance and job related benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	3.9
Chlor Alkali Products and Vinyls Capacity Reductions [Member] | Facility exit costs (asset retirement obligations)
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2.5
Chlor Alkali Products and Vinyls Capacity Reductions [Member] | Pension and other postretirement benefits curtailment
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.0
Chlor Alkali Products and Vinyls Capacity Reductions [Member] | Employee relocation cost
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.0
Chlor Alkali Products and Vinyls Capacity Reductions [Member] | Lease and other contract termination costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 9.2
Chlor Alkali Products Mercury
Restructuring Cost and Reserve [Line Items]
Restructuring charges						3.8	3.7			40.6
Chlor Alkali Products Mercury | Write-off of equipment and facility
Restructuring Cost and Reserve [Line Items]
Restructuring charges										17.8
Chlor Alkali Products Mercury | Employee severance and job related benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges										5.6
Chlor Alkali Products Mercury | Facility exit costs (asset retirement obligations)
Restructuring Cost and Reserve [Line Items]
Restructuring charges										15.6
Chlor Alkali Products Mercury | Pension and other postretirement benefits curtailment
Restructuring Cost and Reserve [Line Items]
Restructuring charges										0.0
Chlor Alkali Products Mercury | Employee relocation costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges										0.9
Chlor Alkali Products Mercury | Lease and other contract termination costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges										0.7
Winchester Segment
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 0.3	$ 0.1		$ 0.7	$ 1.9	$ 1.8			24.7	25.0
Winchester Segment | Write-off of equipment and facility
Restructuring Cost and Reserve [Line Items]
Restructuring charges										0.0	0.0
Winchester Segment | Employee severance and job related benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges										13.1	13.1
Winchester Segment | Facility exit costs (asset retirement obligations)
Restructuring Cost and Reserve [Line Items]
Restructuring charges										2.2	2.3
Winchester Segment | Pension and other postretirement benefits curtailment
Restructuring Cost and Reserve [Line Items]
Restructuring charges										4.1	4.1
Winchester Segment | Employee relocation cost
Restructuring Cost and Reserve [Line Items]
Restructuring charges											5.5
Winchester Segment | Employee relocation costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges										5.3
Winchester Segment | Lease and other contract termination costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges										$ 0.0	$ 0.0

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DISCONTINUED OPERATIONS (Details Textuals) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Discontinued Operations [Abstract]
Payment of Indemnity Obligations		$ 5.5
Income from Discontinued Operation, before Income Tax	$ 0.0	4.6	$ 0.0
Expense recorded due to changes in tax contingencies from discontinued operations		$ 2.2

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DISCONTINUED OPERATIONS (Details 1) - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Discontinued Operations [Abstract]
Income from Discontinued Operation, before Income Tax					$ 0.0	$ 4.6	$ 0.0
Discontinued Operation, Tax Effect of Discontinued Operation					0.0	3.9	0.0
Income from discontinued operations, net	$ 0.0	$ 0.0	$ 0.7	$ 0.0	$ 0.0	$ 0.7	$ 0.0

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EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended									12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share [Abstract]
Income from continuing operations						$ 12.8	$ 26.1	$ 36.6	$ 29.5	$ (1.4)	$ 105.0	$ 178.6
Income from discontinued operations, net						0.0	0.0	0.7	0.0	0.0	0.7	0.0
Net income	$ (37.9)	$ (62.7)	$ 5.9	$ 42.3	$ 13.1	$ 12.8	$ 26.1	$ 37.3	$ 29.5	$ (1.4)	$ 105.7	$ 178.6
Basic shares (in shares)	165.1				77.4					103.4	78.6	79.9
Earnings per Share, Basic [Abstract]
Income from continuing operations						$ 0.16	$ 0.33	$ 0.46	$ 0.37	$ (0.01)	$ 1.33	$ 2.24
Income from discontinued operations, net						0.00	0.00	0.01	0.00	0.00	0.01	0.00
Basic net income per share (in dollars per share)	$ (0.23)	$ (0.39)	$ 0.08	$ 0.55	$ 0.17	0.16	0.33	0.47	0.37	$ (0.01)	$ 1.34	$ 2.24
Earnings per Share, Diluted [Abstract]
Basic shares (in shares)	165.1				77.4					103.4	78.6	79.9
Stock-based compensation (in shares)	0.0				1.1					0.0	1.1	1.0
Diluted shares (in shares)	165.1				78.5					103.4	79.7	80.9
Income from continuing operations						0.16	0.33	0.46	0.37	$ (0.01)	$ 1.32	$ 2.21
Income from discontinued operations, net						0.00	0.00	0.01	0.00	0.00	0.01	0.00
Diluted net income per share (in dollars per share)	$ (0.23)	$ (0.39)	$ 0.08	$ 0.54	$ 0.17	$ 0.16	$ 0.33	$ 0.47	$ 0.37	$ (0.01)	$ 1.33	$ 2.21
Antidilutive shares excluded from the computation of earnings per share (in shares)	7.0				1.4					5.2	0.6	0.6

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ALLOWANCE FOR DOUBTFUL ACCOUNTS RECEIVABLES (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	$ 6.4	$ 3.0	$ 3.0	$ 3.4
Provisions charged	1.4	0.2	5.2	0.2
Write-offs, net of recoveries	(1.5)	(0.1)	(1.8)	(0.6)
Balance at end of period	$ 6.3	$ 3.1	6.4	3.0
Other Receivables			$ 71.1	$ 21.2

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INVENTORIES (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2014	Mar. 31, 2016	Dec. 31, 2015	Oct. 05, 2015	Mar. 31, 2015
Business Acquisition [Line Items]
Supplies	$ 39.2	$ 73.7	$ 86.5		$ 40.2
Raw materials	63.3	88.0	91.5		63.6
Work in process	31.8	108.1	105.8		37.2
Finished goods	141.5	452.2	445.3		141.1
Inventory, Gross	275.8	722.0	729.1		282.1
LIFO reserves	(65.7)	(42.5)	(43.9)		(66.0)
Inventories	$ 210.1	$ 679.5	$ 685.2		$ 216.1
Percentage of inventory using the last-in, first-out (LIFO) method of inventory accounting (in hundredths)	58.00%		49.00%
Effect of LIFO Inventory Liquidation on Income	$ 1.5
DCP Business
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory				$ 477.1
Initial Valuation [Member] | DCP Business
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory				$ 477.1

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PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 5,452.8			$ 2,261.7
Accumulated depreciation	(1,499.4)	$ (1,587.9)	$ (1,357.9)	(1,330.7)
Property, plant and equipment, net	3,953.4	$ 3,859.0	$ 919.9	931.0
Land and improvements to land
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 280.4			157.3
Land and improvements to land | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (in years)	10 years
Land and improvements to land | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (in years)	20 years
Building and building equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 380.4			212.1
Building and building equipment | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (in years)	10 years
Building and building equipment | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (in years)	30 years
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 4,665.8			1,846.1
Machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (in years)	3 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (in years)	15 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 2.7			2.6
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 123.5			$ 43.6

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PROPERTY, PLANT AND EQUIPMENT PROPERTY, PLANT AND EQUIPMENT (Details Textuals) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Oct. 05, 2015 USD ($)
Property, Plant and Equipment [Line Items]
Weighted Average Useful Life of Machinery and Equipment	12
Depreciation expense	$ 198.1	$ 124.5	$ 120.7
Interest capitalized	1.1	0.2	1.1
Maintenance and repairs	158.5	125.0	134.7
(Decrease) Increase in Capital Expenditures Incurred but Not Yet Paid	(7.4)	(0.5)	7.9
Proceeds from sale/leaseback of equipment	0.0	$ 0.0	35.8
Capital Leased Assets, Gross	$ 1.4		$ 4.2
DCP Business
Property, Plant and Equipment [Line Items]
Business Combination, Property, Plant, and Equipment Acquired				$ 3,090.8

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INVESTMENTS-AFFILIATED COMPANIES (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Nov. 16, 2007
Schedule of Equity Method Investments [Line Items]
Gain (Loss) on Sale of Equity Investments			$ 0.0	$ 0.0	$ 6.5
Equity Method Investments	$ 25.2	$ 23.7	25.0	23.3
Earnings of non-consolidated affiliates	$ (0.2)	$ (0.4)	(1.7)	(1.7)	(2.8)
Distributions from our non-consolidated affiliates			0.0	0.0	1.5
Bleach Joint Venture
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Aggregate Cost						$ 11.6
Gain (Loss) on Sale of Equity Investments					6.5
Receivable from the sale of an equity method investment			8.5
Proceeds from the sale of an equity method investment			8.8
Earnings of non-consolidated affiliates			$ 0.0	0.0	(0.7)
Bay Gas
Schedule of Equity Method Investments [Line Items]
Limited partner interest (in hundredths)			9.10%
General partner interest (in hundredths)			90.90%
Equity Method Investments			$ 25.0	23.3
Earnings of non-consolidated affiliates			$ (1.7)	$ (1.7)	$ (2.1)

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OTHER ASSETS (Details) - USD ($) $ in Millions			3 Months Ended	12 Months Ended
	Oct. 05, 2015	Oct. 05, 2015	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Business Combination, Separately Recognized Transactions [Line Items]
Equity Method Investments			$ 25.2	$ 25.0	$ 23.7	$ 23.3
Deferred debt issuance costs			3.1	3.3	15.1	1.4
Long term receivable from the sale of an equity method investment			0.0	0.0	5.8	7.8
Tax-Related Receivable, Noncurrent			14.4	1.5	6.6
Hedging Assets, Noncurrent			0.0	0.0	2.9	3.5
Supply contracts			402.2	406.5	0.0	0.0
Other Assets, Miscellaneous, Noncurrent			18.9	18.3	16.1	16.4
Other assets			463.8	454.6	$ 70.2	$ 59.0
Up-front payments under the ethylene agreements	$ 433.5
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Ethylene Asset	$ 410.8	$ 410.8
Amortization of Supply Contracts			4.3	$ 4.3
DCP Business
Business Combination, Separately Recognized Transactions [Line Items]
Up-front payments under the ethylene agreements		$ 433.5
Minimum
Business Combination, Separately Recognized Transactions [Line Items]
2017 Supply Contract Payment			205.0
2020 Supply Contract Payment			425.0
Maximum
Business Combination, Separately Recognized Transactions [Line Items]
2017 Supply Contract Payment			215.0
2020 Supply Contract Payment			$ 465.0

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GOODWILL AND INTANGIBLES GOODWILL AND INTANGIBLES (Details 1) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill [Line Items]
Goodwill	$ 2,146.1	$ 747.1	$ 2,174.1	$ 747.1	$ 747.1
Goodwill, Purchase Accounting Adjustments	(28.8)	0.0
Acquisition activity			1,427.5	0.0
Foreign currency translation adjustment	0.8		(0.5)
Chlor Alkali Products and Vinyls Segment
Goodwill [Line Items]
Goodwill	1,854.8	747.1	1,877.5	747.1	747.1
Goodwill, Purchase Accounting Adjustments	(23.3)	0.0
Acquisition activity			1,130.8	0.0
Foreign currency translation adjustment	0.6		(0.4)
Epoxy Segment
Goodwill [Line Items]
Goodwill	291.3	0.0	296.6	0.0	$ 0.0
Goodwill, Purchase Accounting Adjustments	(5.5)	$ 0.0
Acquisition activity			296.7	$ 0.0
Foreign currency translation adjustment	$ 0.2		$ (0.1)

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GOODWILL AND INTANGIBLES GOODWILL AND INTANGIBLES (Details 2) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Assets, Gross	$ 749.2	$ 745.9	$ 166.1	$ 166.1
Finite-Lived Intangible Assets, Accumulated Amortization	(86.0)	(68.4)	(46.3)	(42.6)
Finite-Lived Intangible Assets, Net	663.2	677.5	119.8	123.5
Customers, customer contracts and relationships
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Assets, Gross	643.8	641.0	152.9	152.9
Finite-Lived Intangible Assets, Accumulated Amortization	(75.9)	(64.0)	(44.7)	(41.0)
Finite-Lived Intangible Assets, Net	$ 567.9	577.0	108.2	111.9
Trade Names
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Asset, Useful Life	1 year
Finite-Lived Intangible Assets, Gross	$ 17.9	17.9	10.9	10.9
Finite-Lived Intangible Assets, Accumulated Amortization	(2.7)	0.0	0.0	0.0
Finite-Lived Intangible Assets, Net	15.2	17.9	10.9	10.9
Acquired Technology
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Assets, Gross	85.2	84.7	0.0	0.0
Finite-Lived Intangible Assets, Accumulated Amortization	(5.7)	(2.7)	0.0	0.0
Finite-Lived Intangible Assets, Net	79.5	82.0	0.0	0.0
Other Intangible Assets
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Assets, Gross	2.3	2.3	2.3	2.3
Finite-Lived Intangible Assets, Accumulated Amortization	(1.7)	(1.7)	(1.6)	(1.6)
Finite-Lived Intangible Assets, Net	$ 0.6	$ 0.6	$ 0.7	$ 0.7
Minimum | Customers, customer contracts and relationships
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Asset, Useful Life		10 years
Minimum | Acquired Technology
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Asset, Useful Life		7 years
Minimum | Other Intangible Assets
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Asset, Useful Life		4 years
Maximum | Customers, customer contracts and relationships
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Asset, Useful Life		15 years
Maximum | Acquired Technology
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Asset, Useful Life		7 years
Maximum | Other Intangible Assets
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Asset, Useful Life		10 years

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GOODWILL AND INTANGIBLES GOODWILL AND INTANGIBLES (Detail Textuals) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Oct. 05, 2015
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Amortization		$ 25.8	$ 14.6	$ 14.6
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months		59.3
Finite-Lived Intangible Assets, Amortization Expense, Year Two		59.2
Finite-Lived Intangible Assets, Amortization Expense, Year Three		59.2
Finite-Lived Intangible Assets, Amortization Expense, Year Four		59.2
Finite-Lived Intangible Assets, Amortization Expense, Year Five		$ 59.2
DCP Business
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Intangible assets					$ 582.3
Trade Names
Schedule Of Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items]
Finite-Lived Intangible Asset, Useful Life	1 year
Amortization	$ 2.7

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DEBT (Detail Textuals) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Mar. 31, 2016	Nov. 05, 2015	Nov. 03, 2015	Oct. 05, 2015	Jun. 23, 2015	Mar. 26, 2015	Aug. 31, 2014	Jun. 24, 2014	Jun. 23, 2014	Jun. 30, 2012	Oct. 31, 2011	Dec. 22, 1997
Debt Instrument [Line Items]
2023 Senior Notes								$ 720.0
2025 Senior Notes								500.0
Delayed-Draw Term Loan Facility of Spinco									$ 1,050.0
Delayed-Draw Term Loan Facility of Spinco, Amount Drawn								875.0
Senior Credit Facility									1,850.0			$ 415.0
Maximum amount of senior revolving credit facility									500.0			265.0	$ 265.0
Delayed-Draw Term Loan Facility, Maximum Borrowing Capacity									1,350.0
Delayed-Draw Term Loan Facility, Amount Drawn								475.0
Subfacility of Senior Credit Facility									$ 100.0
Available credit under senior revolving credit facility		$ 489.6
Amount of letters of credit issued under subfacility		10.4
Annual Required Principal Payment (Percent) in Years 1 and 2									5.00%
Annual Required Principal Payment (Percent) in Year 3									7.50%
Annual Required Principal Payment (Percent) in Years 4 and 5									10.00%
Sumitomo Credit Facility								600.0
Sumitomo Credit Facility Amendment							$ 200.0
Sumitomo Credit Facility Amendment Borrowing						$ 200.0
Long-term debt assumed								569.0
Combined Senior Credit Facility		1,850.0						1,850.0
Business Acquisition Debt Issuance Costs		13.3
Bridge Financing Commitments										$ 3,354.5
Bridge Financing Amortized Debt Issuance Costs	$ 14.3	30.0
Notes payable	$ 665.1	3,848.8	$ 666.2		$ 3,833.0
Call premium and write-off of unamortized deferred debt issuance costs and unamortized discount			9.5
Call premium			6.7
Write-off of unamortized deferred debt issuance costs		0.5	2.1
Write-off of unamortized discount			0.7
Delayed-Draw Term Loan Facility												$ 150.0
Capital Leased Assets, Gross		1.4		$ 4.2
Total letters of credit outstanding		27.6
Expected maturities of long-term debt [Abstract]
2016		206.5
2017		80.9
2018		901.9
2019		135.7
2020		980.3
Thereafter		1,576.4
Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge					0.3									$ 2.2
Reduction in interest expense due to interest rate swaps		2.8	2.9	2.9
Variable -Rate Go Zone Bonds
Debt Instrument [Line Items]
Notes payable		$ 50.0	$ 50.0
Interest rate		1.40%	1.31%
Senior Term Loan Facility due 2019
Debt Instrument [Line Items]
Notes payable		$ 0.0	$ 149.1
Repayments of Senior Debt		2.8	$ 0.9
Refinancing of Senior Debt		$ 146.3
Interest rate		0.00%	1.66%
2023 Notes
Debt Instrument [Line Items]
2023 Senior Notes								$ 720.0
Notes payable		$ 720.0	$ 0.0
Interest rate		9.75%	0.00%					9.75%
2025 Notes
Debt Instrument [Line Items]
2025 Senior Notes								$ 500.0
Notes payable		$ 500.0	$ 0.0
Interest rate		10.00%	0.00%					10.00%
SunBelt Notes
Debt Instrument [Line Items]
Notes payable		$ 25.0	$ 37.8
Interest rate		7.23%	7.23%
Repayments of Debt		$ 12.2	$ 12.2	12.2
Notes payable due 2019
Debt Instrument [Line Items]
Notes payable											$ 150.0
Notes payable due 2013
Debt Instrument [Line Items]
Repayments of Senior Debt				$ 11.4
Variable Interest Rate Swaps $125M
Expected maturities of long-term debt [Abstract]
Swap Amount		125.0			125.0
Deferred (Gain) Loss on Discontinuation of Fair Value Hedge		1.2	3.7		(0.6)										$ 11.0
Fixed Interest Rate Swaps $125M
Expected maturities of long-term debt [Abstract]
Swap Amount		125.0			$ 125.0
SunBelt Notes
Expected maturities of long-term debt [Abstract]
Swap Amount														73.1
Deferred (Gain) Loss on Discontinuation of Fair Value Hedge		0.4	$ 0.8											$ 2.2
Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge		(0.4)
Guaranteed Senior Secured Notes due 2017, Series O
Debt Instrument [Line Items]
Face amount of senior secured notes																$ 97.5
Required annual debt repayment for Series O and Series G notes		6.1
Guaranteed Senior Secured Notes due 2017, Series G
Debt Instrument [Line Items]
Face amount of senior secured notes																$ 97.5
Required annual debt repayment for Series O and Series G notes		6.1
SunBelt
Debt Instrument [Line Items]
Interest rate																7.23%
Required annual debt repayment for Series O and Series G notes		$ 12.2

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DEBT (Details 1) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015	Oct. 05, 2015	Mar. 31, 2015	Dec. 31, 2014	Jun. 30, 2012	Oct. 31, 2011
Debt Instrument [Line Items]
Notes payable	$ 3,833.0	$ 3,848.8		$ 665.1	$ 666.2
Capital Lease Obligations		4.6			3.6
Debt Issuance Cost		(32.9)			(8.9)
Current installments of long-term debt	205.1	205.0		16.4	16.4
Long-term debt	3,627.9	3,643.8		$ 648.7	649.8
Senior Term Loan Facility
Debt Instrument [Line Items]
Notes payable		$ 1,350.0			$ 0.0
Interest rate		2.17%			0.00%
Sumitomo Credit Facility
Debt Instrument [Line Items]
Notes payable		$ 800.0			$ 0.0
Interest rate		1.77%			0.00%
Variable-Rate Recovery Zone Bonds
Debt Instrument [Line Items]
Notes payable		$ 103.0			$ 103.0
Interest rate		1.40%			1.31%
Variable -Rate Go Zone Bonds
Debt Instrument [Line Items]
Notes payable		$ 50.0			$ 50.0
Interest rate		1.40%			1.31%
Industrial Development and Environmental Improvement Obligations
Debt Instrument [Line Items]
Notes payable		$ 2.9			$ 2.9
Interest rate		0.27%			0.20%
Senior Term Loan Facility due 2019
Debt Instrument [Line Items]
Notes payable		$ 0.0			$ 149.1
Interest rate		0.00%			1.66%
2023 Notes
Debt Instrument [Line Items]
Notes payable		$ 720.0			$ 0.0
Interest rate		9.75%	9.75%		0.00%
2025 Notes
Debt Instrument [Line Items]
Notes payable		$ 500.0			$ 0.0
Interest rate		10.00%	10.00%		0.00%
2022 Notes
Debt Instrument [Line Items]
Notes payable		$ 200.0			$ 200.0
Interest rate		5.50%			5.50%
Notes payable due 2016
Debt Instrument [Line Items]
Notes payable		$ 126.2			$ 128.7
Interest rate		6.75%			6.75%
SunBelt Notes
Debt Instrument [Line Items]
Notes payable		$ 25.0			$ 37.8
Interest rate		7.23%			7.23%
Unamortized fair value premium		$ 0.2			$ 0.5
Variable Interest Rate Swaps $125M
Debt Instrument [Line Items]
Deferred (Gain) Loss on Discontinuation of Fair Value Hedge	$ (0.6)	1.2			3.7		$ 11.0
SunBelt Notes
Debt Instrument [Line Items]
Deferred (Gain) Loss on Discontinuation of Fair Value Hedge		$ 0.4			$ 0.8	$ 2.2

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DEBT (Details 2) $ in Millions	Dec. 31, 2015 USD ($)
Interest Rate Floating Swap Due 2016 65
Debt Instrument [Line Items]
Derivative, Notional Amount	$ 65.0
Derivative, Lower Variable Interest Rate Range	3.75%
Derivative, Higher Variable Interest Rate Range	4.75%
Interest Rate Floating Swap Due 2016 60
Debt Instrument [Line Items]
Derivative, Notional Amount	$ 60.0
Derivative, Lower Variable Interest Rate Range	3.75%
Derivative, Higher Variable Interest Rate Range	4.75%
Interest Rate Fixed Swap Due 2016 65
Debt Instrument [Line Items]
Derivative, Notional Amount	$ 65.0
Derivative, Lower Variable Interest Rate Range	3.75%
Derivative, Higher Variable Interest Rate Range	4.75%
Interest Rate Fixed Swap Due 2016 60
Debt Instrument [Line Items]
Derivative, Notional Amount	$ 60.0
Derivative, Lower Variable Interest Rate Range	3.75%
Derivative, Higher Variable Interest Rate Range	4.75%

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PENSION PLANS (Details Textuals)	3 Months Ended		12 Months Ended
	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Oct. 05, 2015 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Cost Recognized	$ 6,600,000	$ 4,300,000	$ 6,900,000	$ 5,700,000	$ 5,200,000
Expenses of the defined contribution pension plans			18,100,000	16,100,000	15,400,000
After-tax charge to shareholders' equity			78,800,000	84,800,000
Pretax amount of after-tax (benefit) charge recorded in shareholders' equity			$ (125,400,000)	$ (138,900,000)	(14,400,000)
Basis point increase (decrease) in the plans' discount rate reflected in charge to shareholders' equity			50	(60)
Defined Benefit Plan, Curtailments			$ (12,700,000)	$ (200,000)
Actuarial (gain) loss			(44,000,000)	255,600,000
Benefit Obligation, Period Increase (Decrease) Due to New Mortality Tables				90.0
Defined Benefit Plan, Benefit Obligation			2,685,900,000	2,182,800,000	1,978,700,000
Projected benefit payments [Abstract]
Curtailments		(200,000)	47,200,000	200,000	0
Change in Control Mandatory Acceleration of Expenses Under the Non-Qualified Pension Plan			47,100,000
Defined Benefit Plan Recognized Net Gain Loss Due To Settlement and Curtailments Becancour			(100,000)
Defined Benefit Plan, Amortization of Net Losses			22,000,000
Par outstanding value of bonds used to determine the discount rate yield curve			$ 250,000,000
Historic rate of return on plan assets in the last 5 year period (in hundredths)			7.50%
Historic rate of return on plan assets in the last 10 year period (in hundredths)			9.30%
Historic rate of return on plan assets in the last 15 year period (in hundredths)			8.00%
Defined Benefit Plan, Contributions by Employer	500,000	200,000	$ 78,600,000	5,400,000
United States Pension Plan of US Entity
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Curtailments			(12,600,000)	0
Actuarial (gain) loss			(45,800,000)	245,800,000
Defined Benefit Plan, Benefit Obligation			2,458,500,000	2,116,500,000	1,916,500,000
Projected benefit payments [Abstract]
Curtailments	$ 0	$ 100,000
Defined Benefit Plan, Contributions by Employer			77,600,000	4,500,000
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Curtailments			(100,000)	(200,000)
Actuarial (gain) loss			1,800,000	9,800,000
Defined Benefit Plan, Benefit Obligation			227,400,000	66,300,000	$ 62,200,000
Projected benefit payments [Abstract]
Defined Benefit Plan, Contributions by Employer			900,000	800,000
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year			5,000,000
Defined Benefit Plan, Contributions by Employer			1,000,000	900,000
Non-Qualified Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation			5,100,000	$ 65,400,000
Projected benefit payments [Abstract]
2016			500,000
2017			500,000
2018			400,000
2019			500,000
2020			600,000
Qualified Pension Plan
Projected benefit payments [Abstract]
2016			135,900,000
2017			135,700,000
2018			136,500,000
2019			136,600,000
2020			$ 136,700,000
Minimum
Defined Benefit Plan Disclosure [Line Items]
Contribution To Individual Retirement Account Percentage Of Employees Eligible Compensation	5.00%		5.00%
Maximum
Defined Benefit Plan Disclosure [Line Items]
Contribution To Individual Retirement Account Percentage Of Employees Eligible Compensation	10.00%		10.00%
DCP Business
Defined Benefit Plan Disclosure [Line Items]
Pension liabilities assumed						$ 442,300,000
Projected benefit payments [Abstract]
Change in Control Mandatory Acceleration of Expenses Under the Non-Qualified Pension Plan			$ 47,100,000
DCP Business | United States Pension Plan of US Entity
Defined Benefit Plan Disclosure [Line Items]
Pension liabilities assumed						281,700,000
DCP Business | Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Pension liabilities assumed						160,600,000
Initial Valuation [Member] | DCP Business
Defined Benefit Plan Disclosure [Line Items]
Pension liabilities assumed						447,100,000
Initial Valuation [Member] | DCP Business | United States Pension Plan of US Entity
Defined Benefit Plan Disclosure [Line Items]
Pension liabilities assumed						$ 286,500,000

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PENSION PLANS (Details 1) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	$ 2,685.9	$ 2,182.8	$ 2,182.8	$ 1,978.7
Service cost			4.3	2.8
Interest cost			83.3	86.5	$ 81.1
Actuarial (gain) loss			(44.0)	255.6
Benefits paid			(208.4)	(135.5)
Curtailments/settlements			12.7	0.2
Business combination			669.9	0.0
Currency translation adjustments			(14.7)	(5.5)
Benefit obligation at end of year			2,685.9	2,182.8	1,978.7
Change in Plan Assets [Roll Forward]
Fair value of plans' assets at beginning of year	2,036.5	1,978.7	1,978.7	1,860.7
Actual return on plans' assets			(25.0)	253.6
Employer contributions	0.5	0.2	78.6	5.4
Benefits paid			(208.4)	(135.5)
Business combination			222.8	0.0
Currency translation adjustments			(10.2)	(5.5)
Fair value of plans' assets at end of year			2,036.5	1,978.7	1,860.7
Funded Status [Abstract]
Total funded status			(649.4)	(204.1)
Qualified Pension Plan
Funded Status [Abstract]
Total funded status			(644.3)	(138.7)
Non-Qualified Pension Plan
Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	5.1	65.4	65.4
Benefit obligation at end of year			5.1	65.4
Funded Status [Abstract]
Total funded status			(5.1)	(65.4)
United States Pension Plan of US Entity
Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	2,458.5	2,116.5	2,116.5	1,916.5
Service cost			2.1	2.3
Interest cost	22.4	20.6	80.2	83.8
Actuarial (gain) loss			(45.8)	245.8
Benefits paid			(205.6)	(131.9)
Curtailments/settlements			12.6	0.0
Business combination			498.5	0.0
Currency translation adjustments			0.0	0.0
Benefit obligation at end of year			2,458.5	2,116.5	1,916.5
Change in Plan Assets [Roll Forward]
Fair value of plans' assets at beginning of year	1,974.0	1,915.4	1,915.4	1,798.6
Actual return on plans' assets			(25.4)	244.2
Employer contributions			77.6	4.5
Benefits paid			(205.6)	(131.9)
Business combination			212.0	0.0
Currency translation adjustments			0.0	0.0
Fair value of plans' assets at end of year			1,974.0	1,915.4	1,798.6
Funded Status [Abstract]
Total funded status			(484.5)	(201.1)
United States Pension Plan of US Entity | Qualified Pension Plan
Funded Status [Abstract]
Total funded status			(480.8)	(137.5)
United States Pension Plan of US Entity | Non-Qualified Pension Plan
Funded Status [Abstract]
Total funded status			(3.7)	(63.6)
Foreign Pension Plans, Defined Benefit
Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	227.4	66.3	66.3	62.2
Service cost			2.2	0.5
Interest cost			3.1	2.7
Actuarial (gain) loss			1.8	9.8
Benefits paid			(2.8)	(3.6)
Curtailments/settlements			0.1	0.2
Business combination			171.4	0.0
Currency translation adjustments			(14.7)	(5.5)
Benefit obligation at end of year			227.4	66.3	62.2
Change in Plan Assets [Roll Forward]
Fair value of plans' assets at beginning of year	$ 62.5	$ 63.3	63.3	62.1
Actual return on plans' assets			0.4	9.4
Employer contributions			1.0	0.9
Benefits paid			(2.8)	(3.6)
Business combination			10.8	0.0
Currency translation adjustments			(10.2)	(5.5)
Fair value of plans' assets at end of year			62.5	63.3	$ 62.1
Funded Status [Abstract]
Total funded status			(164.9)	(3.0)
Foreign Pension Plans, Defined Benefit | Qualified Pension Plan
Funded Status [Abstract]
Total funded status			(163.5)	(1.2)
Foreign Pension Plans, Defined Benefit | Non-Qualified Pension Plan
Funded Status [Abstract]
Total funded status			$ (1.4)	$ (1.8)

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PENSION PLANS (Details 2) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Amounts Recognized in Balance Sheet [Abstract]
Accrued benefit in current liabilities	$ (0.5)	$ (22.1)
Accrued benefit in noncurrent liabilities	(648.9)	(182.0)
Accumulated other comprehensive loss	740.8	677.8
Net balance sheet impact	91.4	473.7
United States Pension Plan of US Entity
Amounts Recognized in Balance Sheet [Abstract]
Accrued benefit in current liabilities	(0.4)	(21.8)
Accrued benefit in noncurrent liabilities	(484.1)	(179.3)
Accumulated other comprehensive loss	714.2	654.8
Net balance sheet impact	229.7	453.7
Foreign Pension Plans, Defined Benefit
Amounts Recognized in Balance Sheet [Abstract]
Accrued benefit in current liabilities	(0.1)	(0.3)
Accrued benefit in noncurrent liabilities	(164.8)	(2.7)
Accumulated other comprehensive loss	26.6	23.0
Net balance sheet impact	$ (138.3)	$ 20.0

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PENSION PLANS (Details 3) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Projected benefit obligation	$ 2,685.9	$ 2,182.8
Accumulated benefit obligation	2,655.0	2,170.8
Fair value of plan assets	$ 2,036.5	$ 1,978.7

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PENSION PLANS (Details 4) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost			$ 7.8	$ 5.3	$ 6.2
Interest cost			83.3	86.5	81.1
Expected return on plans' assets			(147.4)	(139.5)	(137.5)
Actuarial (gain) loss			(44.0)	255.6
Amortization of prior service cost			1.6	2.2	1.9
Recognized actuarial loss			26.2	20.3	27.8
Curtailments/settlements		$ (0.2)	47.2	0.2	0.0
Net periodic benefit income (cost)			18.7	(25.0)	(20.5)
Included in Other Comprehensive Loss (Pretax) [Abstract]
Liability adjustment			125.4	138.9	14.4
Amortization of prior service costs and actuarial losses			(62.4)	(22.7)	$ (29.7)
United States Pension Plan of US Entity
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 3.2	1.6
Interest cost	22.4	20.6	80.2	83.8
Expected return on plans' assets	(39.8)	(35.6)
Actuarial (gain) loss			(45.8)	245.8
Recognized actuarial loss	5.3	7.5
Curtailments/settlements	0.0	0.1
Net periodic benefit income (cost)	(8.9)	(5.8)
United States Postretirement Benefit Plan of US Entity [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0.3	0.3
Interest cost	0.5	0.6	2.0	2.3
Expected return on plans' assets	0.0	0.0
Actuarial (gain) loss			$ (0.7)	$ 2.4
Recognized actuarial loss	0.8	0.9
Curtailments/settlements	0.0	0.1
Net periodic benefit income (cost)	$ 1.6	$ 1.9

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PENSION PLANS (Details 5)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
United States Pension Plans of US Entity, Defined Benefit
Weighted Average Assumptions [Abstract]
Discount rate-periodic benefit cost (in hundredths)	3.90%	4.50%	3.90%
Expected return on assets (in hundredths)	7.75%	7.75%	7.75%
Rate of compensation increase (in hundredths)	3.00%	3.00%	3.00%
Discount rate-benefit obligation (in hundredths)	4.40%	3.90%	4.50%
Foreign Pension Plans, Defined Benefit
Weighted Average Assumptions [Abstract]
Discount rate-periodic benefit cost (in hundredths)	2.80%	4.80%	4.20%
Expected return on assets (in hundredths)	6.00%	7.50%	7.75%
Rate of compensation increase (in hundredths)	3.00%	3.50%	3.50%
Discount rate-benefit obligation (in hundredths)	2.70%	3.90%	4.80%

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PENSION PLANS (Details 6)	12 Months Ended
	Dec. 31, 2015
Long-term rate of return assumption by asset class [Abstract]
U.S. equities, minimum (in hundredths)	9.00%
U.S. equities, maximum (in hundredths)	13.00%
Non-U.S. equities, minimum (in hundredths)	10.00%
Non-U.S. equities, maximum (in hundredths)	14.00%
Fixed income/cash, minimum (in hundredths)	5.00%
Fixed income/cash, maximum (in hundredths)	9.00%
Alternative investments, minimum (in hundredths)	5.00%
Alternative investments, maximum (in hundredths)	15.00%
Absolute return strategies, minimum (in hundredths)	8.00%
Absolute return strategies, maximum (in hundredths)	12.00%

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PENSION PLANS (Details 7)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations	100.00%	100.00%
U.S. Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations	4.00%	4.00%
Defined Benefit Plan, Target Plan Asset Allocations	6.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	0.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	14.00%
Non-U.S. Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations	6.00%	7.00%
Defined Benefit Plan, Target Plan Asset Allocations	6.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	0.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	14.00%
Fixed Income / Cash
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations	47.00%	52.00%
Defined Benefit Plan, Target Plan Asset Allocations	61.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	48.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	80.00%
Acquisition plan receivable
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations	10.00%	0.00%
Alternative Investments
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations	19.00%	21.00%
Defined Benefit Plan, Target Plan Asset Allocations	7.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	0.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	28.00%
Absolute Return Strategies
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations	14.00%	16.00%
Defined Benefit Plan, Target Plan Asset Allocations	20.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	10.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	30.00%

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PENSION PLANS (Details 8) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	$ 2,036.5	$ 1,978.7	$ 1,860.7
Fair Value, Inputs, Level 1
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	97.6	171.3
Fair Value, Inputs, Level 2
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	1,312.8	1,362.7
Fair Value, Inputs, Level 3
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	626.1	444.7
U.S. Equity Securities
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	79.6	82.2
U.S. Equity Securities | Fair Value, Inputs, Level 1
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	36.4	69.8
U.S. Equity Securities | Fair Value, Inputs, Level 2
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	43.2	12.4
U.S. Equity Securities | Fair Value, Inputs, Level 3
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	0.0	0.0
Non-U.S. Equity Securities
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	122.7	150.9
Non-U.S. Equity Securities | Fair Value, Inputs, Level 1
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	0.8	35.4
Non-U.S. Equity Securities | Fair Value, Inputs, Level 2
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	121.9	115.5
Non-U.S. Equity Securities | Fair Value, Inputs, Level 3
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	0.0	0.0
Acquisition plan receivable
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	212.0
Acquisition plan receivable | Fair Value, Inputs, Level 1
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	0.0
Acquisition plan receivable | Fair Value, Inputs, Level 2
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	0.0
Acquisition plan receivable | Fair Value, Inputs, Level 3
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	212.0
Cash and Cash Equivalents
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	60.1	65.7
Cash and Cash Equivalents | Fair Value, Inputs, Level 1
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	60.1	65.7
Cash and Cash Equivalents | Fair Value, Inputs, Level 2
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	0.0	0.0
Cash and Cash Equivalents | Fair Value, Inputs, Level 3
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	0.0	0.0
US Treasury Securities
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	427.6	469.9
US Treasury Securities | Fair Value, Inputs, Level 1
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	0.0	0.0
US Treasury Securities | Fair Value, Inputs, Level 2
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	425.6	465.6
US Treasury Securities | Fair Value, Inputs, Level 3
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	2.0	4.3
Corporate Debt Securities
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	314.2	339.7
Corporate Debt Securities | Fair Value, Inputs, Level 1
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	0.3	0.4
Corporate Debt Securities | Fair Value, Inputs, Level 2
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	301.9	329.7
Corporate Debt Securities | Fair Value, Inputs, Level 3
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	12.0	9.6
Asset-backed Securities
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	155.6	150.5
Asset-backed Securities | Fair Value, Inputs, Level 1
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	0.0	0.0
Asset-backed Securities | Fair Value, Inputs, Level 2
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	155.6	150.5
Asset-backed Securities | Fair Value, Inputs, Level 3
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	0.0	0.0
Hedge Funds, Equity
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	335.6	358.8
Hedge Funds, Equity | Fair Value, Inputs, Level 1
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	0.0	0.0
Hedge Funds, Equity | Fair Value, Inputs, Level 2
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	0.0	0.0
Hedge Funds, Equity | Fair Value, Inputs, Level 3
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	335.6	358.8
Real Estate Funds
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	27.4	34.0
Real Estate Funds | Fair Value, Inputs, Level 1
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	0.0	0.0
Real Estate Funds | Fair Value, Inputs, Level 2
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	0.0	0.0
Real Estate Funds | Fair Value, Inputs, Level 3
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	27.4	34.0
Private Equity Funds
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	18.4	17.7
Private Equity Funds | Fair Value, Inputs, Level 1
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	0.0	0.0
Private Equity Funds | Fair Value, Inputs, Level 2
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	0.0	0.0
Private Equity Funds | Fair Value, Inputs, Level 3
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	18.4	17.7
Absolute Return Strategies
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	283.3	309.3
Absolute Return Strategies | Fair Value, Inputs, Level 1
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	0.0	0.0
Absolute Return Strategies | Fair Value, Inputs, Level 2
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	264.6	289.0
Absolute Return Strategies | Fair Value, Inputs, Level 3
Defined benefit pension plan assets [Abstract]
Fair value of plan assets	$ 18.7	$ 20.3

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PENSION PLANS (Details 9) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Assets measured with significant unobservable input [Roll Forward]
Balance, Beginning Period	$ 444.7	$ 414.2
Realized Gain/(Loss)	10.3	3.6
Unrealized Gain/(Loss) Relating to Assets Held at Period End	(0.3)	18.9
Purchases, Sales, Settlements, and Other	171.4	8.0
Transfers In/(Out)	0.0	0.0
Balance, Ending Period	626.1	444.7
Acquisition plan receivable
Assets measured with significant unobservable input [Roll Forward]
Balance, Beginning Period	0.0
Realized Gain/(Loss)	0.0
Unrealized Gain/(Loss) Relating to Assets Held at Period End	0.0
Purchases, Sales, Settlements, and Other	212.0
Transfers In/(Out)	0.0
Balance, Ending Period	212.0	0.0
US Treasury Securities
Assets measured with significant unobservable input [Roll Forward]
Balance, Beginning Period	4.3	4.5
Realized Gain/(Loss)	0.0	0.0
Unrealized Gain/(Loss) Relating to Assets Held at Period End	(0.7)	(0.3)
Purchases, Sales, Settlements, and Other	(1.6)	0.1
Transfers In/(Out)	0.0	0.0
Balance, Ending Period	2.0	4.3
Corporate Debt Securities
Assets measured with significant unobservable input [Roll Forward]
Balance, Beginning Period	9.6	21.5
Realized Gain/(Loss)	0.5	2.0
Unrealized Gain/(Loss) Relating to Assets Held at Period End	(0.2)	(1.3)
Purchases, Sales, Settlements, and Other	2.1	(12.6)
Transfers In/(Out)	0.0	0.0
Balance, Ending Period	12.0	9.6
Hedge Funds, Equity
Assets measured with significant unobservable input [Roll Forward]
Balance, Beginning Period	358.8	315.9
Realized Gain/(Loss)	7.2	0.0
Unrealized Gain/(Loss) Relating to Assets Held at Period End	(3.4)	17.9
Purchases, Sales, Settlements, and Other	(27.0)	25.0
Transfers In/(Out)	0.0	0.0
Balance, Ending Period	335.6	358.8
Real Estate Funds
Assets measured with significant unobservable input [Roll Forward]
Balance, Beginning Period	34.0	35.7
Realized Gain/(Loss)	2.4	1.6
Unrealized Gain/(Loss) Relating to Assets Held at Period End	3.7	2.0
Purchases, Sales, Settlements, and Other	(12.7)	(5.3)
Transfers In/(Out)	0.0	0.0
Balance, Ending Period	27.4	34.0
Private Equity Funds
Assets measured with significant unobservable input [Roll Forward]
Balance, Beginning Period	17.7	17.9
Realized Gain/(Loss)	0.2	0.0
Unrealized Gain/(Loss) Relating to Assets Held at Period End	0.8	(0.2)
Purchases, Sales, Settlements, and Other	(0.3)	0.0
Transfers In/(Out)	0.0	0.0
Balance, Ending Period	18.4	17.7
Absolute Return Strategies
Assets measured with significant unobservable input [Roll Forward]
Balance, Beginning Period	20.3	18.7
Realized Gain/(Loss)	0.0	0.0
Unrealized Gain/(Loss) Relating to Assets Held at Period End	(0.5)	0.8
Purchases, Sales, Settlements, and Other	(1.1)	0.8
Transfers In/(Out)	0.0	0.0
Balance, Ending Period	$ 18.7	$ 20.3

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POSTRETIREMENT BENEFITS (Details Textuals) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Shareholders' Equity Charges
Pretax amount of after-tax (benefit) charge recorded in shareholders' equity		$ (125.4)	$ (138.9)	$ (14.4)
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments	$ 0.2	(47.2)	(0.2)	0.0
Change in Control Mandatory Acceleration of Expenses Under the Non-Qualified Pension Plan		47.1
Defined Benefit Plan Recognized Net Gain Loss Due To Settlement and Curtailments Becancour		(0.1)
Defined Benefit Plan, Amortization of Net Losses		22.0
Other Postretirement Benefit Plans, Defined Benefit
Shareholders' Equity Charges
After-tax (benefit) charge to shareholders' equity for other postretirement plans		(0.1)	1.8
Pretax amount of after-tax (benefit) charge recorded in shareholders' equity		0.1	(3.1)	1.9
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments		(0.1)	0.0	$ 0.0
Defined Benefit Plan, Amortization of Net Losses		3.0
Par outstanding value of non-callable zero coupon bond used to determine the hypothetical yield curve		250.0
Defined Benefit Plan, Expected Future Benefit Payments in Year One		$ 5.0
Defined Benefit Plan, Expected Future Benefit Payments in Year Two			5.0
Defined Benefit Plan, Expected Future Benefit Payments in Year Three			5.0
Defined Benefit Plan, Expected Future Benefit Payments in Year Four			5.0
Defined Benefit Plan, Expected Future Benefit Payments in Year Five			$ 5.0

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POSTRETIREMENT BENEFITS (Details 1) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	$ 2,685.9	$ 2,182.8	$ 2,182.8	$ 1,978.7
Service cost			4.3	2.8
Interest cost			83.3	86.5	$ 81.1
Actuarial (gain) loss			(44.0)	255.6
Benefits paid			(208.4)	(135.5)
Currency translation adjustments			(14.7)	(5.5)
Defined Benefit Plan, Curtailments			(12.7)	(0.2)
Benefit obligation at end of year			2,685.9	2,182.8	1,978.7
Funded status			(649.4)	(204.1)
US Postretirement Plans
Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	53.9	58.5	58.5	59.0
Service cost			1.1	1.0
Interest cost	0.5	0.6	2.0	2.3
Actuarial (gain) loss			(0.7)	2.4
Benefits paid			(7.0)	(6.2)
Currency translation adjustments			0.0	0.0
Defined Benefit Plan, Curtailments			0.0	0.0
Benefit obligation at end of year			53.9	58.5	59.0
Funded status			(53.9)	(58.5)
Foreign Plans
Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	8.1	8.7	8.7	8.6
Service cost			0.1	0.1
Interest cost			0.3	0.4
Actuarial (gain) loss			0.7	0.7
Benefits paid			(0.3)	(0.4)
Currency translation adjustments			(1.5)	(0.7)
Defined Benefit Plan, Curtailments			0.1	0.0
Benefit obligation at end of year			8.1	8.7	8.6
Funded status			(8.1)	(8.7)
Other Postretirement Benefit Plans, Defined Benefit
Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	$ 62.0	$ 67.2	67.2	67.6
Service cost			1.2	1.1	1.3
Interest cost			2.3	2.7	2.6
Actuarial (gain) loss			0.0	3.1
Benefits paid			(7.3)	(6.6)
Currency translation adjustments			(1.5)	(0.7)
Defined Benefit Plan, Curtailments			0.1	0.0
Benefit obligation at end of year			62.0	67.2	$ 67.6
Funded status			$ (62.0)	$ (67.2)

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POSTRETIREMENT BENEFITS (Details 2) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Amounts recognized in consolidated balance sheet [Abstract]
Accrued benefit in current liabilities	$ (0.5)	$ (22.1)
Accrued benefit in noncurrent liabilities	(648.9)	(182.0)
Accumulated other comprehensive loss	740.8	677.8
Net balance sheet impact	91.4	473.7
US Postretirement Plans
Amounts recognized in consolidated balance sheet [Abstract]
Accrued benefit in current liabilities	(5.3)	(5.2)
Accrued benefit in noncurrent liabilities	(48.6)	(53.3)
Accumulated other comprehensive loss	29.7	33.6
Net balance sheet impact	(24.2)	(24.9)
Foreign Plans
Amounts recognized in consolidated balance sheet [Abstract]
Accrued benefit in current liabilities	(0.3)	(0.3)
Accrued benefit in noncurrent liabilities	(7.8)	(8.4)
Accumulated other comprehensive loss	0.2	(0.4)
Net balance sheet impact	(7.9)	(9.1)
Other Postretirement Benefit Plans, Defined Benefit
Amounts recognized in consolidated balance sheet [Abstract]
Accrued benefit in current liabilities	(5.6)	(5.5)
Accrued benefit in noncurrent liabilities	(56.4)	(61.7)
Accumulated other comprehensive loss	29.9	33.2
Net balance sheet impact	$ (32.1)	$ (34.0)

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POSTRETIREMENT BENEFITS (Details 3) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Components of Net Periodic Benefit Cost [Abstract]
Service cost			$ 4.3	$ 2.8
Interest cost			83.3	86.5	$ 81.1
Amortization of prior service cost			1.6	2.2	1.9
Curtailments		$ (0.2)	47.2	0.2	0.0
Net periodic benefit income (cost)			18.7	(25.0)	(20.5)
Included in Other Comprehensive Loss (Pretax) [Abstract]
Liability adjustment			125.4	138.9	14.4
Amortization of prior service costs and actuarial losses	$ 6.1	$ 8.6	65.6	25.5	33.3
Other Postretirement Benefit Plans, Defined Benefit
Components of Net Periodic Benefit Cost [Abstract]
Service cost			1.2	1.1	1.3
Interest cost			2.3	2.7	2.6
Amortization of prior service cost			0.0	(0.1)	(0.1)
Recognized actuarial loss			3.1	2.9	3.7
Curtailments			0.1	0.0	0.0
Net periodic benefit income (cost)			6.7	6.6	7.5
Included in Other Comprehensive Loss (Pretax) [Abstract]
Liability adjustment			(0.1)	3.1	(1.9)
Amortization of prior service costs and actuarial losses			$ (3.2)	$ (2.8)	$ (3.6)

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POSTRETIREMENT BENEFITS (Details 4) - Other Postretirement Benefit Plans, Defined Benefit	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Weighted Average Assumptions [Abstract]
Discount rate-periodic benefit cost (in hundredths)	3.70%	4.30%	3.60%
Discount rate-benefit obligation (in hundredths)	4.10%	3.70%	4.30%

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POSTRETIREMENT BENEFITS (Details 5) - Other Postretirement Benefit Plans, Defined Benefit	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Assumed healthcare cost trend rates [Abstract]
Healthcare cost trend rate assumed for next year (in hundredths)	8.50%	8.50%
Rate that the cost trend rate gradually declines to (in hundredths)	5.00%	5.00%
Year that the rate reaches the ultimate rate	2022	2021

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POSTRETIREMENT BENEFITS (Details 6) - Other Postretirement Benefit Plans, Defined Benefit $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)
One-Percentage Point Increase [Abstract]
Effect of one percentage point increase on total of service and interest costs	$ 0.2
Effect of one percentage point increase on postretirement benefit obligation	3.1
One-Percentage Point Decrease [Abstract]
Effect of one percentage point decrease on total of service and interest costs	(0.2)
Effect of one percentage point decrease on postretirement benefit obligation	$ (2.6)

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INCOME TAXES (Detail Textuals) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Loss Carryforwards [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%	35.00%	35.00%	35.00%	35.00%
Income tax receivable	$ 1.5	$ 6.6	$ 1.5	$ 6.6
U.S. Tax on Foreign Earnings, Amount			8.6
Non-deductible Transactions Costs, Amount			8.9
Lower Foreign Earnings Tax, Amount			8.7
Salt Depletion Benefit, Amount			2.6
Return to Provision Adjustment				1.2
Benefit from expiration of statute of limitation				0.7	$ 11.4
Increases in Valuation Allowances on State Tax Credit Balances				(0.8)	8.3
Remeasurement of Deferred Taxes				0.6
Benefit from Section 41 Research Credit					1.9
Expense due to changes in Tax Contingency, Amount					1.8
Expense associated with increase in valuation allowance on state tax credits					1.3
Deferred Tax Assets, Operating Loss Carryforwards			40.1	3.3
Deferred state tax benefits relating to net operating losses			9.3
State tax credit carryforward			13.6
Capital loss carry-forward			12.3
Deferred Tax Assets, Capital Loss Carryforwards			4.7	4.8
Unrecognized tax benefits [Abstract]
Unrecognized Tax Benefits	33.5	36.1	35.1	36.1	34.5
Impact on the effective tax rate, if recognized	31.9	$ 35.0	33.5	35.0
Expense recorded due to changes in tax contingencies from discontinued operations				2.2
Interest and penalties accrued			3.4	3.2
Interest and penalties (benefit) expense			0.2	$ 0.4	$ (0.5)
Reasonable possibility that unrecognized tax benefits will decrease over next twelve months	$ 9.5		9.4
United States
Operating Loss Carryforwards [Line Items]
Net operating loss carry-forward (NOL)			75.9
Deferred Tax Assets, Operating Loss Carryforwards			26.6
Operating loss carryforward limitation on use			2.5
Operating loss carryforward annual limitation on use			0.5
Foreign
Operating Loss Carryforwards [Line Items]
Net operating loss carry-forward (NOL)			23.1
Deferred Tax Assets, Operating Loss Carryforwards			4.2
Operating Loss Carryforwards Subject to Expiration			8.2
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration			1.7
Operating Loss Carryforwards Not Subject to Expiration			14.9
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration			$ 2.5

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INCOME TAXES (Details 1) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Components of Income Before Taxes [Abstract]
Domestic income before taxes			$ (66.9)	$ 164.4	$ 222.2
Foreign income before taxes			73.6	(1.7)	27.8
Income from continuing operations before taxes	$ (55.4)	$ 19.6	6.7	162.7	250.0
Current Expense (Benefit) [Abstract]
Federal			(16.6)	25.9	42.1
State			1.2	1.3	9.4
Foreign			14.4	5.3	8.5
Total current income tax expense			(1.0)	32.5	60.0
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Deferred Federal Income Tax Expense (Benefit)			8.9	26.9	10.4
Deferred State Income Tax Expense (Benefit)			(2.4)	3.0	1.9
Deferred Foreign Income Tax Expense (Benefit)			2.6	(4.7)	(0.9)
Deferred Income Tax Expense			9.1	25.2	11.4
Income tax provision	$ (17.5)	$ 6.5	$ 8.1	$ 57.7	$ 71.4

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INCOME TAXES (Details 2)	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Effective Tax Rate Reconciliation (Percent)
Statutory federal tax rate (in hundredths)	35.00%	35.00%	35.00%	35.00%	35.00%
State income taxes, net (in hundredths)	(1.40%)	0.60%	(38.20%)	2.40%	2.30%
Foreign rate differential (in hundredths)	(3.80%)	(0.10%)	(129.80%)	0.40%	(0.90%)
US Tax on Foreign Earnings	3.80%	0.00%	128.60%	(0.60%)	0.80%
Domestic manufacturing/export tax incentive (in hundredths)	(0.00%)	(3.00%)	(0.00%)	(1.80%)	(1.60%)
Effective Income Tax Rate Reconciliation, Deduction, Salt Depletion, Percent	(3.40%)	(0.60%)	(38.80%)	(0.50%)	(0.30%)
Effective Income Tax Rate Reconciliation, Non-deductible Transaction Costs, Percent			133.10%	0.00%	0.00%
Change in valuation allowance (in hundredths)	0.10%	1.00%	27.90%	1.10%	(2.10%)
Remeasurement of deferred taxes (in hundredths)			7.60%	0.40%	0.10%
Change in tax contingencies (in hundredths)	1.60%	0.00%	5.00%	(0.30%)	(3.80%)
Dividends paid to CEOP (in hundredths)	(0.60%)	(0.60%)	(11.10%)	(0.50%)	(0.30%)
Return to provision (in hundredths)			(4.20%)	(0.70%)	(0.10%)
Research tax credit (in hundredths)			(3.10%)	(0.00%)	(0.80%)
Other, net (in hundredths)	0.30%	0.90%	8.90%	0.60%	0.30%
Effective tax rate (in hundredths)	31.60%	33.20%	120.90%	35.50%	28.60%

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INCOME TAXES (Details 3) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets [Abstract]
Pension and postretirement benefits	$ 235.2	$ 108.0
Environmental reserves	55.3	56.5
Asset retirement obligations	21.0	22.9
Accrued liabilities	53.7	52.5
Tax credits	23.3	9.2
Federal and state net operating losses	40.1	3.3
Capital loss carryforward	4.7	4.8
Other miscellaneous items	18.5	10.0
Total deferred tax assets	451.8	267.2
Valuation allowance	29.3	16.6	$ 13.4
Net deferred tax assets	422.5	250.6
Deferred tax liabilities [Abstract]
Property, plant and equipment	875.6	174.5
Intangible amortization	138.4	14.2
Deferred Tax Liabilities, Inventory	11.6	4.5
Partnerships	101.4	97.8
Deferred Tax Liabilities, Undistributed Foreign Earnings	294.8	0.0
Deferred Tax Liabilities, Gross	1,421.8	291.0
Total deferred tax liabilities	$ (999.3)	$ (40.4)

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INCOME TAXES INCOME TAXES (Details 4) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Valuation Allowance [Abstract]
Valuation allowance	$ 29.3	$ 16.6	$ 13.4
Amount charged to income tax provision	1.8	4.1
Purchase accounting	12.3	0.0
Amount credited to income tax provision (i.e. deduction from reserve)	$ (1.4)	$ (0.9)

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INCOME TAXES (Details 5) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Balance at beginning of period	$ 35.1	$ 36.1	$ 36.1	$ 34.5
Increases for current year tax positions			0.0	2.2
Increases for prior year tax positions			0.2	0.2
Reductions due to statute of limitations			0.0	(0.4)
Decreases for prior year tax positions	(1.6)	0.0	0.0	(0.3)
Decreases due to tax settlements			(1.2)	(0.1)
Balance at end of period	$ 33.5	$ 36.1	$ 35.1	$ 36.1

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INCOME TAXES (Details 6)	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
U.S Federal Income Tax | Early Open Year
Income Tax Examination [Line Items]
Tax years	2008
U.S Federal Income Tax | Early Range Maximum
Income Tax Examination [Line Items]
Tax years		2008
U.S Federal Income Tax | Late Range Minimum
Income Tax Examination [Line Items]
Tax years	2010	2010
U.S Federal Income Tax | Late Range Maximum
Income Tax Examination [Line Items]
Tax years	2015	2015
U.S State Income Tax | Minimum
Income Tax Examination [Line Items]
Tax years	2006	2006
U.S State Income Tax | Maximum
Income Tax Examination [Line Items]
Tax years	2015	2014
Canada | Foreign Income Tax | Minimum
Income Tax Examination [Line Items]
Tax years	2012	2010
Canada | Foreign Income Tax | Maximum
Income Tax Examination [Line Items]
Tax years	2015	2014
Brazil | Foreign Income Tax | Minimum
Income Tax Examination [Line Items]
Tax years	2014	2014
Brazil | Foreign Income Tax | Maximum
Income Tax Examination [Line Items]
Tax years	2015	2015
Germany | Foreign Income Tax
Income Tax Examination [Line Items]
Tax years	2015	2015
China | Foreign Income Tax | Minimum
Income Tax Examination [Line Items]
Tax years	2014	2014
China | Foreign Income Tax | Maximum
Income Tax Examination [Line Items]
Tax years	2015	2015
The Netherlands | Foreign Income Tax | Minimum
Income Tax Examination [Line Items]
Tax years	2014	2014
The Netherlands | Foreign Income Tax | Maximum
Income Tax Examination [Line Items]
Tax years	2015	2015
South Korea | Foreign Income Tax | Minimum
Income Tax Examination [Line Items]
Tax years	2014	2014
South Korea | Foreign Income Tax | Maximum
Income Tax Examination [Line Items]
Tax years	2015	2015
Hong Kong | Foreign Income Tax
Income Tax Examination [Line Items]
Tax years	2015
Hong Kong | Foreign Income Tax | Maximum
Income Tax Examination [Line Items]
Tax years		2015

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ACCRUED LIABILITIES (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Accrued Liabilities, Current [Abstract]
Acquisition-related accruals		$ 90.2		$ 0.0
Accrued compensation and payroll taxes		53.4		40.4
Accrued interest		35.0		4.7
Legal and professional costs		32.0		26.3
Accrued employee benefits		24.4		41.5
Environmental (current portion only)		19.0		19.0
Asset retirement obligation (current portion only)		7.3		10.2
Other		66.8		72.2
Accrued liabilities	$ 352.3	$ 328.1	$ 205.1	$ 214.3

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CONTRIBUTING EMPLOYEE OWNERSHIP PLAN (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Employer matching contributions to employee ownership plan	$ 6.6	$ 4.3	$ 6.9	$ 5.7	$ 5.2
Initial vesting period (in years)			2
Initial vesting period vested percentage			25.00%
Additional vesting percentage for each additional year of service			25.00%
Years of service for full vesting			5
Vesting percentage after five years			100.00%
Number of days an employee is prohibited from trading out of the fund to which the transfer was made			7

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STOCK-BASED COMPENSATION (Detail Textuals) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option and long-term incentive plans, exercisable period (in years)	10 years
Stock options, restricted stock and performance shares vesting period (in years)	3 years
Average exercise period for outstanding options (in months)	65 months
Average exercise period for exercisable options (in months)	50 months
Aggregate intrinsic value for outstanding options	$ 2.5
Aggregate intrinsic value for exercisable options	2.5
Total intrinsic value of options exercised	1.3	$ 3.9	$ 4.2
Total unrecognized compensation, unvested	$ 5.3
Total unrecognized compensation, unvested, weighted average recognition period (in years)	15 months
Performance share award cycle (in years)	3
Liability recorded for performance shares to be settled in cash	$ 3.5
Performance Share Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation, unvested	$ 4.9
Total unrecognized compensation, unvested, weighted average recognition period (in years)	14 months

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STOCK-BASED COMPENSATION (Details 1) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Allocated Share-based Compensation Expense	$ 4.4	$ 2.5	$ 11.5	$ 9.2	$ 13.3
Mark-to-market adjustments	0.4	5.2	(3.0)	(3.6)	4.2
Total expense	$ 4.8	$ 7.7	$ 8.5	$ 5.6	$ 17.5

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STOCK-BASED COMPENSATION STOCK-BASED COMPENSATION (Details 2) - $ / shares	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Stock Options Activity [Rollforward]
Outstanding at beginning of year (in shares)	4,720,105	4,133,753	4,133,753
Granted (in shares)	1,670,400	776,750	776,750	624,200	621,000
Exercised (in shares)			(147,608)
Canceled (in shares)			(42,790)
Outstanding at end of year (in shares)			4,720,105	4,133,753
Option Price, outstanding, beginning of period, minimum (in dollars per share)				$ 14.28
Option price, outstanding, beginning of period, maximum (in dollars per share)		$ 27.64	$ 27.64
Option price, granted, minimum (in dollars per share)			27.40
Option price, granted, maximum (in dollars per share)			27.40
Option price, exercised, minimum (in dollars per share)			14.28
Option price exercised, maximum (in dollars per share)			25.57
Option price, canceled, minimum (in dollars per share)			23.28
Option price, canceled, maximum (in dollars per share)			27.40
Option price, outstanding, minimum, end of period (in dollars per share)			14.28
Option price, outstanding, maximum, end of period (in dollars per share)			27.65
Weighted average option price, beginning of period (in dollars per share)	$ 21.29	20.14	20.14
Weighted average option price, granted (in dollars per share)	$ 13.14	$ 27.40	27.40	25.69	$ 23.28
Weighted average option price, exercised (in dollars per share)			20.11
Weighted average option price, canceled (in dollars per share)			25.14
Weighted average option price, outstanding, end of period (in dollars per share)			$ 21.29	$ 20.14
Options exercisable, beginning of period (in shares)	3,371,449	2,976,870	2,976,870
Options exercisable, end of period (in shares)			3,371,449	2,976,870
Weighted average exercise price, exercisable , beginning of period (in dollars per share)	$ 19.28	$ 18.50	$ 18.50
Weighted average exercise price, exercisable, end of period (in dollars per share)			$ 19.28	$ 18.50

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STOCK-BASED COMPENSATION (Details 3)	12 Months Ended
	Dec. 31, 2015 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercisable (in shares) | shares	3,371,449
Options outstanding (in shares) | shares	4,720,105
Under $16
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise price, minimum, (in dollars per share)	$ 0.00
Range of exercise price, maximum, (in dollars per share)	$ 16.00
Options exercisable (in shares) | shares	916,046
Weighted average exercise price, exercisable (in dollars per share)	$ 15.05
Options outstanding (in shares) | shares	916,046
Weighted average exercise price, outstanding (in dollars per share)	$ 15.05
$16-$22
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise price, minimum, (in dollars per share)	16.00
Range of exercise price, maximum, (in dollars per share)	$ 22.00
Options exercisable (in shares) | shares	1,870,281
Weighted average exercise price, exercisable (in dollars per share)	$ 19.85
Options outstanding (in shares) | shares	1,870,281
Weighted average exercise price, outstanding (in dollars per share)	$ 19.85
Over $22
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise price, minimum, (in dollars per share)	$ 22.00
Options exercisable (in shares) | shares	585,122
Weighted average exercise price, exercisable (in dollars per share)	$ 24.11
Options outstanding (in shares) | shares	1,933,778
Weighted average exercise price, outstanding (in dollars per share)	$ 25.65

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STOCK-BASED COMPENSATION (Details 4)	Dec. 31, 2015 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Sub-limit for all types of stock awards included in available to be issued stock options (in shares)	1,420,442
2000 Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long Term Incentive Plan authorized additional shares reserved for issuance (in shares)	277,586
Number of shares available for grant or purchase (in shares)	2,911
2003 Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long Term Incentive Plan authorized additional shares reserved for issuance (in shares)	389,921
Number of shares available for grant or purchase (in shares)	10,138
2006 Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long Term Incentive Plan authorized additional shares reserved for issuance (in shares)	1,591,479
Number of shares available for grant or purchase (in shares)	168,783
2009 Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long Term Incentive Plan authorized additional shares reserved for issuance (in shares)	2,762,161
Number of shares available for grant or purchase (in shares)	506,610
2014 Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long Term Incentive Plan authorized additional shares reserved for issuance (in shares)	3,000,000
Number of shares available for grant or purchase (in shares)	2,009,000
Long Term Incentive Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long Term Incentive Plan authorized additional shares reserved for issuance (in shares)	8,021,147
Long Term Incentive Stock Option Plan Expired And Assumed
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant or purchase (in shares)	2,697,442
1997 Stock Plan For Non Employee Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long Term Incentive Plan authorized additional shares reserved for issuance (in shares)	572,978
Number of shares available for grant or purchase (in shares)	567,476
Employee deferral Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long Term Incentive Plan authorized additional shares reserved for issuance (in shares)	45,627
Number of shares available for grant or purchase (in shares)	45,623
Stock Purchase Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long Term Incentive Plan authorized additional shares reserved for issuance (in shares)	618,605
Number of shares available for grant or purchase (in shares)	613,099
Committed shares reserved under the stock purchase plans for non employee Directors	5,501

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STOCK-BASED COMPENSATION (Details 5)	12 Months Ended
	Dec. 31, 2015 $ / shares shares
Unvested Performance Shares [Rollforward]
Unvested, beginning of period (in shares) | shares	87,334
Granted (in shares) | shares	126,000
Vested (in shares) | shares	(101,445)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period | shares	(1,889)
Unvested, end of period (in shares) | shares	110,000
Weighted average fair value per share, beginning of period (in dollars per share) | $ / shares	$ 23.04
Weighted average fair value per share, granted (in dollars per share) | $ / shares	27.40
Weighted average fair value, vested (in dollars per share) | $ / shares	17.48
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value | $ / shares	25.83
Weighted average fair value, end of period (in dollars per share) | $ / shares	$ 17.48
To Settle in Cash
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding at beginning of period, performance shares (in shares) | shares	290,917
Granted, performance shares (in shares) | shares	126,000
Paid/Issued, performance shares (in shares) | shares	(105,611)
Performance shares converted to cash | shares	2,111
Canceled, performance shares (in shares) | shares	(1,889)
Shares outstanding at end of period, performance shares (in shares) | shares	311,528
Total vested at end of period, performance shares (in shares) | shares	201,528
Weighted average fair value, outstanding at beginning of period, performance shares (in dollars per share) | $ / shares	$ 23.04
Weighted average fair value, granted, performance shares (in dollars per share) | $ / shares	27.40
Weighted average fair value, paid/issued, performance shares (in dollars per share) | $ / shares	23.04
Weighted Average Fair Value Performance Shares Converted to Cash | $ / shares	24.42
Weighted average fair value, canceled, performance shares (in dollars per share) | $ / shares	25.83
Weighted average fair value, outstanding at end of period, performance shares (in dollars per share) | $ / shares	17.48
Weighted average fair value, total vested at end of period, performance shares (in dollars per share) | $ / shares	$ 17.48
To Settle in Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding at beginning of period, performance shares (in shares) | shares	281,000
Granted, performance shares (in shares) | shares	126,000
Paid/Issued, performance shares (in shares) | shares	(101,000)
Performance shares converted to cash | shares	(2,111)
Canceled, performance shares (in shares) | shares	(1,889)
Shares outstanding at end of period, performance shares (in shares) | shares	302,000
Total vested at end of period, performance shares (in shares) | shares	192,000
Weighted average fair value, outstanding at beginning of period, performance shares (in dollars per share) | $ / shares	$ 23.46
Weighted average fair value, granted, performance shares (in dollars per share) | $ / shares	27.40
Weighted average fair value, paid/issued, performance shares (in dollars per share) | $ / shares	21.92
Weighted Average Fair Value Performance Shares Converted to Cash | $ / shares	24.42
Weighted average fair value, canceled, performance shares (in dollars per share) | $ / shares	26.49
Weighted average fair value, outstanding at end of period, performance shares (in dollars per share) | $ / shares	25.59
Weighted average fair value, total vested at end of period, performance shares (in dollars per share) | $ / shares	$ 24.81

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SHAREHOLDERS' EQUITY (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		12 Months Ended			20 Months Ended	23 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Mar. 31, 2016	Apr. 24, 2014
Stockholders' Equity Note [Abstract]
Authorized share repurchase program (in shares)								8.0
Stock repurchase program, period in force (in years)						3 years	3 years
Common stock repurchased and retired (in shares)	0.0	0.0	0.0	(2.5)	(1.5)
Value of common stock repurchased and retired	$ 0.0	$ 0.0	$ 0.0	$ 64.8	$ 36.2
Total repurchased shares under this program (in shares)						1.9	1.9
Remaining shares authorized to be purchased (in shares)	6.1		6.1			6.1	6.1
Stock options exercised (in shares)		0.1	0.1	0.5	0.5
Total value of stock options exercised		$ 2.8	$ 3.1	$ 12.1	$ 9.7
Foreign currency translation adjustment [Roll Forward]
Beginning balance	$ (12.1)	(2.3)	(2.3)	(0.5)	2.1
Unrealized losses, before Reclassification Adjustments and Tax	24.0	(1.4)	(15.7)	(1.8)	(2.6)
Reclassification adjustments into income	0.0	0.0	0.0	0.0	0.0
Tax benefit	8.5	0.0	5.9	0.0	0.0
Net Change in Foreign Currency Translation Adjustment	15.5	(1.4)	(9.8)	(1.8)	(2.6)
Ending balance	3.4	(3.7)	(12.1)	(2.3)	(0.5)	$ (12.1)	$ 3.4
Unrealized gains (losses) on derivative contracts (net of taxes) [Roll Forward]
Beginning balance	(6.9)	(4.2)	(4.2)	0.9	4.7
Unrealized Loss on Derivatives Arising During Period, before Tax	1.1	(2.4)	(13.9)	(10.2)	(7.7)
Reclassification Adjustment from AOCI on Derivatives, before Tax	3.7	1.9	9.7	1.8	1.4
Derivatives Qualifying as Hedges, Tax	(1.8)	0.2	1.5	3.3	2.5
Unrealized losses on derivative contracts, net	3.0	(0.3)	(2.7)	(5.1)	(3.8)
Ending balance	(3.9)	(4.5)	(6.9)	(4.2)	0.9	(6.9)	(3.9)
Pension and postretirement benefits (net of taxes) [Roll Forward]
Beginning balance	(473.5)	(436.6)	(436.6)	(365.5)	(378.1)
Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments and Tax	0.0	0.0	(125.3)	(142.0)	(12.5)
Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax	6.1	8.6	65.6	25.5	33.3
Deferred tax benefit (provision) on pension and postretirement benefits	2.3	3.5	(22.8)	(45.4)	8.2
Net Change in Pension and Other Postretirement Benefit Plans	3.8	5.1	(36.9)	(71.1)	12.6
Ending balance	(469.7)	(431.5)	(473.5)	(436.6)	(365.5)	(473.5)	(469.7)
Accumulated other comprehensive loss [Roll Forward]
Beginning balance	(492.5)	(443.1)	(443.1)	(365.1)	(371.3)
Other Comprehensive Income (Loss), Net Gain (Loss) Recognized, Before Tax	25.1	(3.8)	(154.9)	(154.0)	(22.8)
Reclassification Adjustment from AOCI, before Tax	9.8	10.5	75.3	27.3	34.7
Other Comprehensive Income (Loss), Tax	(12.6)	(3.3)	30.2	48.7	(5.7)
Other Comprehensive Income (Loss), Net of Tax	22.3	3.4	(49.4)	(78.0)	6.2
Ending balance	$ (470.2)	$ (439.7)	$ (492.5)	$ (443.1)	$ (365.1)	$ (492.5)	$ (470.2)

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SEGMENT INFORMATION (Details 1) - USD ($) $ in Millions	3 Months Ended									12 Months Ended			62 Months Ended	65 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Mar. 31, 2016
Sales [Abstract]
Sales	$ 1,348.2	$ 1,267.4	$ 533.6	$ 535.4	$ 518.0	$ 499.8	$ 593.6	$ 570.4	$ 577.4	$ 2,854.4	$ 2,241.2	$ 2,515.0
Income before taxes [Abstract]
Net (loss) income	(55.4)				19.6					6.7	162.7	250.0
Restructuring charge	(92.8)				(1.2)					(2.7)	(15.7)	(5.5)	$ (77.3)	$ (129.5)
Acquisition-related costs	(10.2)				(10.4)					(123.4)	(4.2)	0.0
Other Operating Income (Expense), Net	10.9				(0.2)					45.7	1.5	0.7
Other operating income	10.9									45.7	1.5	0.7
Interest expense	(48.5)				(7.1)					(97.0)	(43.8)	(38.6)
Interest income	0.3				0.3					1.1	1.3	0.6
Other income (expense)										0.2	0.1	(1.3)
Earnings of non-consolidated affiliates [Abstract]
Total earnings of non-consolidated affiliates	0.2				0.4					1.7	1.7	2.8
Depreciation and amortization expense [Abstract]
Total depreciation and amortization expense	129.7				34.4					228.9	139.1	135.3
Capital spending [Abstract]
Capital expenditures	(76.1)				(23.3)					(130.9)	(71.8)	(90.8)
Assets
Total assets	9,116.9	9,288.9			2,673.1	2,689.2				9,288.9	2,689.2		9,288.9	9,116.9
Investments-Affiliated Companies (at equity) [Abstract]
Investments in non-consolidated affiliates	25.2	25.0			23.7	23.3				25.0	23.3		25.0	25.2
Total Environmental Income Expense										15.7	8.2	10.2
Chlor Alkali Products and Vinyls Segment
Sales [Abstract]
Sales	704.3				339.3					1,713.4	1,502.8	1,737.4
Income before taxes [Abstract]
Net (loss) income	68.1				24.1					115.5	130.1	213.5
Earnings of non-consolidated affiliates [Abstract]
Total earnings of non-consolidated affiliates										1.7	1.7	2.8
Depreciation and amortization expense [Abstract]
Total depreciation and amortization expense										186.1	119.4	117.5
Capital spending [Abstract]
Capital expenditures										(94.5)	(49.6)	(68.0)
Assets
Total assets		6,690.7				1,939.0				6,690.7	1,939.0		6,690.7
Investments-Affiliated Companies (at equity) [Abstract]
Investments in non-consolidated affiliates		25.0				23.3				25.0	23.3		25.0
Epoxy Segment
Sales [Abstract]
Sales	460.2				0.0					429.6	0.0	0.0
Income before taxes [Abstract]
Net (loss) income	8.2				0.0					(7.5)	0.0	0.0
Depreciation and amortization expense [Abstract]
Total depreciation and amortization expense										20.9	0.0	0.0
Capital spending [Abstract]
Capital expenditures										(7.7)	0.0	0.0
Assets
Total assets		1,591.2				0.0				1,591.2	0.0		1,591.2
Winchester Segment
Sales [Abstract]
Sales	183.7				178.7					711.4	738.4	777.6
Income before taxes [Abstract]
Net (loss) income	28.7				29.8					115.6	127.3	143.2
Restructuring charge	(0.3)				(0.1)					(0.7)	(1.9)	(1.8)	(24.7)	$ (25.0)
Depreciation and amortization expense [Abstract]
Total depreciation and amortization expense										17.4	16.3	14.9
Capital spending [Abstract]
Capital expenditures										(25.6)	(21.4)	(21.2)
Assets
Total assets		411.9				361.0				411.9	361.0		411.9
Corporate/Other
Income before taxes [Abstract]
Net (loss) income										(40.8)	(33.9)	(62.6)
Restructuring charge	(92.8)				(1.2)
Acquisition-related costs	(10.2)				(10.4)
Depreciation and amortization expense [Abstract]
Total depreciation and amortization expense										4.5	3.4	2.9
Capital spending [Abstract]
Capital expenditures										(3.1)	(0.8)	$ (1.6)
Assets
Total assets		$ 595.1				$ 389.2				$ 595.1	$ 389.2		$ 595.1
Investments-Affiliated Companies (at equity) [Abstract]
Pension income	12.2				7.1
Total Environmental Income Expense	2.7				0.7
Other corporate and unallocated costs	$ 29.6				$ 22.1

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SEGMENT INFORMATION (Details 2) - USD ($) $ in Millions	3 Months Ended									12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Sales By Geographic Area [Abstract]
Sales	$ 1,348.2	$ 1,267.4	$ 533.6	$ 535.4	$ 518.0	$ 499.8	$ 593.6	$ 570.4	$ 577.4	$ 2,854.4	$ 2,241.2	$ 2,515.0
Long-Lived Assets		3,953.4				931.0				3,953.4	931.0
United States
Sales By Geographic Area [Abstract]
Sales										2,208.5	2,051.4	2,316.2
Long-Lived Assets		3,561.7				889.6				3,561.7	889.6
Foreign
Sales By Geographic Area [Abstract]
Sales										645.9	189.8	$ 198.8
Long-Lived Assets		$ 391.7				$ 41.4				$ 391.7	$ 41.4

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ENVIRONMENTAL (Details 1) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Accrued liabilities for unasserted claims			$ 1.8
Maximum period for required site OM and M expense accrual (in years)			30
Accrual for environmental loss contingencies [Roll Forward]
Beginning balance	$ 138.1	$ 138.3	$ 138.3	$ 144.6
Charges to income	2.7	0.7	15.7	9.6	$ 11.5
Remedial and investigatory spending			(14.1)	(14.9)
Currency translation adjustments			(1.8)	(1.0)
Ending balance	139.2	136.0	138.1	138.3	$ 144.6
Reserves for environmental expenditures-noncurrent	$ 120.2	$ 117.0	119.1	$ 119.3
Future environmental expenditures expected to be utilized over the next 5 years			81.1
Future environmental expenditures expected to be utilized over the next 6 to 10 years			16.7
Future environmental expenditures expected to be utilized beyond 10 years			$ 40.3
Number of sites included in the total estimated environmental liability			69
Number of USEPA NPL sites			14
Number of sites which constituted the largest portion of the environmental liability			9
Percentage of environmental liability that the larger sites made up (in hundredths)			79.00%
Number of sites which constituted the smallest portion of the environmental liability			60
Percentage of environmental liability any one of the smallest sites made up, maximum (in hundredths)			3.00%
Number of larger sites in which part of the site is subject to a remedial investigation and another part is in the long-term OM and M stage			4
Number of larger sites remedial design being developed			1
Number of larger sites subject to remedial investigation and remedial design being developed			1
Number of larger sites in which a remedial investigation is being performed			1
Number of larger sites which are in long-term OM and M			2
Percentage of environmental liability any one of the largest sites made up., maximum (in hundredths)			23.00%
Possible additional contingent environmental liabilities			$ 60.0
Minimum
Expected annual environmental-related cash outlay for site investigation and remediation			15.0
Maximum
Expected annual environmental-related cash outlay for site investigation and remediation			$ 25.0

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ENVIRONMENTAL (Details 2) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Environmental Remediation Obligations [Abstract]
Accrual for Environmental Loss Contingencies	$ 139.2	$ 136.0	$ 138.1	$ 138.3	$ 144.6
Accrued Environmental Loss Contingencies, Noncurrent	120.2	117.0	119.1	119.3
Charges to income	$ 2.7	$ 0.7	15.7	9.6	11.5
Recoveries from third parties of costs incurred and expensed in prior periods			0.0	(1.4)	(1.3)
Total environmental expense (income)			$ 15.7	$ 8.2	$ 10.2

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COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Mar. 31, 2015
Future minimum operating leases [Abstract]
2016		$ 73.7
2017		60.9
2018		51.7
2019		39.5
2020		27.3
Thereafter		80.2
Total operating leases		333.3
Future minimum purchase commitments [Abstract]
2016		560.2
2017		506.4
2018		449.3
2019		442.1
2020		440.3
Thereafter		2,904.9
Total purchase commitments		5,303.2
Total rent expense charged to operations		75.1	$ 66.8	$ 64.2
Legal action liabilities	$ 22.1	21.2	22.1		$ 22.4
Insurance Recoveries	$ 11.0	57.4
Reduction in Cost of Goods Sold Due to Insurance Recoveries		10.5
Reduction in Selling and Administration Due to Insurance Recoveries		0.9
Gain in Other Operating Income due to Insurance Recoveries		46.0	$ 0.0	0.0
Proceeds from Property Damage Portion of Insurance Recoveries		$ 25.8
Customer contract settlement				11.0
Recovery of legacy legal costs				$ 13.9

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DERIVATIVE FINANCIAL INSTRUMENTS (Details Textuals) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jun. 30, 2012	Oct. 31, 2011	Dec. 22, 1997
Derivative [Line Items]
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net	$ 0.0	$ 0.0	$ 0.0	$ 0.0	$ 0.0
CashCollateralProvidedByUsToCounterparties			5.6
Commodity Forward Contracts with Counterparty Wells Fargo	35.0
Series O Face Amount								$ 97.5
Series G Face Amount								$ 97.5
Interest Rate on SunBelt Notes								7.23%
Commodity Forward Contracts with Counterparty Citibank	26.6
Cash flow hedges [Abstract]
Commodity forward contracts with Wells Fargo			43.3
Commodity forward contracts with Citibank			20.3
Cash Flow Hedges Derivative Instruments at Fair Value, Net	(6.6)		11.4
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	(2.7)		5.0
Fair value hedges [Abstract]
Notional Amount on Discontinuation of Interest Rate Fair Value Hedge			73.1			$ 73.1
Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge	(0.3)					(2.2)
Forward Contracts
Derivative [Line Items]
Derivative, Notional Amount	29.6	0.0	21.7	0.0
Forward Contracts Sell
Derivative [Line Items]
Derivative, Notional Amount	98.9	0.0	10.1	0.0
Variable Interest Rate Swaps $125M
Derivative [Line Items]
Derivative, Notional Amount	125.0		125.0
Deferred gain recognized	(0.6)		1.2	3.7			$ 11.0
Fixed Interest Rate Swaps $125M
Derivative [Line Items]
Derivative, Notional Amount	125.0		125.0
Interest Rate Swaps Designated As Fair Value Hedges
Derivative [Line Items]
Derivative, Notional Amount	$ 0.0	$ 0.0	0.0	0.0
SunBelt Notes [Member]
Derivative [Line Items]
Derivative, Notional Amount						73.1
Deferred gain recognized			0.4	$ 0.8		$ 2.2
Fair value hedges [Abstract]
Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge			$ 0.4

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DERIVATIVE FINANCIAL INSTRUMENTS (Details 1) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Copper Commodity Forward Contracts
Derivative [Line Items]
Derivative, Notional Amount	$ 43.1	$ 43.6	$ 58.3	$ 62.7
Zinc Commodity Forward Contracts
Derivative [Line Items]
Derivative, Notional Amount	8.5	8.7	5.6	6.8
Lead Commodity Forward Contracts
Derivative [Line Items]
Derivative, Notional Amount	9.1	9.3	18.5	14.1
Natural Gas Commodity Forward Contracts
Derivative [Line Items]
Derivative, Notional Amount	$ 0.9	$ 2.0	$ 4.3	$ 5.7

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DERIVATIVE FINANCIAL INSTRUMENTS (Details 2) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 0.5	$ 1.2	$ 2.9	$ 3.5
Derivative Liability, Fair Value, Gross Liability	9.1	13.2	12.6	13.1
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0.0	0.0	0.0	0.0
Derivative Liability, Fair Value, Gross Liability	7.5	13.0	11.4	11.6
Designated as Hedging Instrument | Interest Rate Contract Gains | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0.0	0.0	0.0	0.0
Designated as Hedging Instrument | Interest Rate Contract Gains | Other Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0.0	0.0	0.0	0.0
Designated as Hedging Instrument | Interest Rate Contract Gains | Current Installments of Long-term Debt
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	0.6	1.2	0.0	0.0
Designated as Hedging Instrument | Interest Rate Contract Gains | Long-term Debt
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	0.3	0.4	3.8	4.5
Designated as Hedging Instrument | Commodity Contracts Losses | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0.0	0.0	0.0	0.0
Designated as Hedging Instrument | Commodity Contracts Losses | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	7.6	11.5	8.1	7.2
Designated as Hedging Instrument | Commodity Contracts Gains | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0.0	0.0	0.0	0.0
Designated as Hedging Instrument | Commodity Contracts Gains | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	(1.0)	(0.1)	(0.5)	(0.1)
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0.5	1.2	2.9	3.5
Derivative Liability, Fair Value, Gross Liability	1.6	0.2	1.2	1.5
Not Designated as Hedging Instrument | Interest Rate Contract Gains | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0.9	1.2	0.0	0.0
Not Designated as Hedging Instrument | Interest Rate Contract Gains | Other Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0.0	0.0	3.9	4.3
Not Designated as Hedging Instrument | Interest Rate Contract Gains | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	0.0	0.0	0.0	0.0
Not Designated as Hedging Instrument | Interest Rate Contract Gains | Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	0.0	0.0	0.0	0.0
Not Designated as Hedging Instrument | Interest Rate Contract Loss | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	(0.4)	(0.1)	0.0	0.0
Not Designated as Hedging Instrument | Interest Rate Contract Loss | Other Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0.0	0.0	(1.0)	(0.8)
Not Designated as Hedging Instrument | Interest Rate Contract Loss | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	0.0	0.0	0.0	0.0
Not Designated as Hedging Instrument | Interest Rate Contract Loss | Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	0.0	0.0	0.0	0.0
Not Designated as Hedging Instrument | Commodity Contracts Losses | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0.0	0.0	0.0	0.0
Not Designated as Hedging Instrument | Commodity Contracts Losses | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	0.1	0.2	1.2	1.5
Not Designated as Hedging Instrument | Foreign Exchange Contract | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0.4	0.1	0.0	0.0
Not Designated as Hedging Instrument | Foreign Exchange Contract | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	(0.3)	0.0	0.0	$ 0.0
Not Designated as Hedging Instrument | Foreign Exchange Contract Loss [Member] | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	(0.4)	0.0	0.0
Not Designated as Hedging Instrument | Foreign Exchange Contract Loss [Member] | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	$ 1.8	$ 0.0	$ 0.0

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DERIVATIVE FINANCIAL INSTRUMENTS (Details 3) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	$ 1.1	$ (2.4)	$ (13.9)	$ (10.2)	$ (7.7)
Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	(3.5)	(1.7)	(2.1)	1.4	0.4
Cost of Sales | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(3.7)	(1.9)	(9.7)	(1.8)	(1.4)
Interest Rate Contract Gains | Interest Expense | Fair Value Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	0.7	0.7	2.8	2.9	2.9
Commodity Contracts Losses | Cost of Sales | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	(0.4)	(1.7)	(2.2)	1.4	0.4
Foreign Exchange Contract | Selling and Administrative Expenses | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	$ (3.1)	$ 0.0	$ 0.1	$ 0.0	$ 0.0

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FAIR VALUE MEASUREMENTS (Details Textuals) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Mar. 31, 2016	Mar. 31, 2015	Feb. 28, 2011
Fair Value Disclosures [Abstract]
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount	$ 0.0			$ 0.0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount	0.0			0.0
Fair Value, Liabilities, Level 1 to Level 2 Transfers, Amount	0.0			0.0
Fair Value, Liabilities, Level 2 to Level 1 Transfers, Amount	0.0			0.0
Foreign Currency Contracts		$ 0.0
Business Acquisition, Percentage of Voting Interests Acquired						50.00%
Total earn out payment - SunBelt		26.7
Financing portion of earn out payment - SunBelt	0.0	(14.8)	$ (17.1)
Assets, Fair Value Disclosure, Nonrecurring	$ 0.0	$ 0.0	$ 0.0	$ 0.0	$ 0.0

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FAIR VALUE MEASUREMENTS (Details 1) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest Rate Swap Asset Fair Value Disclosure		$ 1.1		$ 3.5
Foreign Currency Contract, Asset, Fair Value Disclosure		0.1
Interest Rate Swap Liability Fair Value Disclosure		1.6		4.5
Commodity Forward Contracts Liability Fair Value Disclosure		11.6		8.6
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest Rate Swap Asset Fair Value Disclosure		0.0		0.0
Foreign Currency Contract, Asset, Fair Value Disclosure		0.0
Interest Rate Swap Liability Fair Value Disclosure		0.0		0.0
Commodity Forward Contracts Liability Fair Value Disclosure		0.0		0.0
Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest Rate Swap Asset Fair Value Disclosure		1.1		3.5
Foreign Currency Contract, Asset, Fair Value Disclosure		0.1
Interest Rate Swap Liability Fair Value Disclosure		1.6		4.5
Commodity Forward Contracts Liability Fair Value Disclosure		11.6		8.6
Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest Rate Swap Asset Fair Value Disclosure		0.0		0.0
Foreign Currency Contract, Asset, Fair Value Disclosure		0.0
Interest Rate Swap Liability Fair Value Disclosure		0.0		0.0
Commodity Forward Contracts Liability Fair Value Disclosure		0.0		$ 0.0
Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	$ 0.5	1.1	$ 2.9
Derivative Liability	0.9	1.6	3.8
Interest Rate Swap [Member] | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0.0	0.0	0.0
Derivative Liability	0.0	0.0	0.0
Interest Rate Swap [Member] | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0.5	1.1	2.9
Derivative Liability	0.9	1.6	3.8
Interest Rate Swap [Member] | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0.0	0.0	0.0
Derivative Liability	0.0	0.0	0.0
Commodity Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability	6.7	11.6	8.8
Commodity Contract [Member] | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability	0.0	0.0	0.0
Commodity Contract [Member] | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability	6.7	11.6	8.8
Commodity Contract [Member] | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability	0.0	0.0	$ 0.0
Foreign Exchange Contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		0.1
Derivative Liability	1.5
Foreign Exchange Contract | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		0.0
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		0.1
Derivative Liability	1.5
Foreign Exchange Contract | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset		$ 0.0
Derivative Liability	$ 0.0

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FAIR VALUE MEASUREMENTS (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	$ 0.0	$ 0.0	$ 26.7
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, Sales, Issuances, Settlements	$ 0.0	$ (26.7)

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FAIR VALUE MEASUREMENTS (Details 3) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Long-term Debt, Fair Value	$ 3,931.5	$ 3,979.9	$ 691.7	$ 684.9
Notes payable	3,833.0	3,848.8	665.1	666.2
Fair Value, Inputs, Level 1
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Long-term Debt, Fair Value	0.0	0.0	0.0	0.0
Fair Value, Inputs, Level 2
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Long-term Debt, Fair Value	3,778.5	3,826.9	538.7	531.9
Fair Value, Inputs, Level 3
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Long-term Debt, Fair Value	$ 153.0	$ 153.0	$ 153.0	$ 153.0

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OTHER FINANCIAL DATA (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended									12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Data [Abstract]
Sales	$ 1,348.2	$ 1,267.4	$ 533.6	$ 535.4	$ 518.0	$ 499.8	$ 593.6	$ 570.4	$ 577.4	$ 2,854.4	$ 2,241.2	$ 2,515.0
Cost of goods sold	1,175.4	1,148.1	460.0	445.5	433.2	421.9	492.3	463.6	475.4	2,486.8	1,853.2	2,033.7
Income from continuing operations						12.8	26.1	36.6	29.5	(1.4)	105.0	178.6
Income from discontinued operations, net						0.0	0.0	0.7	0.0	0.0	0.7	0.0
Net income	$ (37.9)	$ (62.7)	$ 5.9	$ 42.3	$ 13.1	$ 12.8	$ 26.1	$ 37.3	$ 29.5	$ (1.4)	$ 105.7	$ 178.6
Earnings per Share, Basic [Abstract]
Income from continuing operations						$ 0.16	$ 0.33	$ 0.46	$ 0.37	$ (0.01)	$ 1.33	$ 2.24
Income from discontinued operations, net						0.00	0.00	0.01	0.00	0.00	0.01	0.00
Basic net income per share (in dollars per share)	$ (0.23)	$ (0.39)	$ 0.08	$ 0.55	$ 0.17	0.16	0.33	0.47	0.37	(0.01)	1.34	2.24
Earnings per Share, Diluted [Abstract]
Income (Loss) from Continuing Operations, Per Diluted Share						0.16	0.33	0.46	0.37	(0.01)	1.32	2.21
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share						0.00	0.00	0.01	0.00	0.00	0.01	0.00
Diluted net income per share (in dollars per share)	(0.23)	(0.39)	0.08	0.54	0.17	0.16	0.33	0.47	0.37	(0.01)	1.33	$ 2.21
Common Stock, Dividends, Per Share, Declared	$ 0.20	0.20	0.20	0.20	0.20	0.20	0.20	0.20	0.20	0.80	0.80
Market price of common stock [Abstract]
High (in dollars per share)		22.13	27.18	32.56	34.34	25.97	28.08	29.28	29.18	34.34	29.28
Low (in dollars per share)		$ 16.60	$ 15.73	$ 26.77	$ 22.00	$ 20.43	$ 25.23	$ 26.42	$ 24.51	$ 15.73	$ 20.43

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SUPPLEMENTAL GUARANTOR FINANCIAL INFORMATION SUPPLEMENTAL GUARANTOR FINANCIAL INFORMATION (Detail Textuals) $ in Millions	Oct. 05, 2015 USD ($)
Supplemental Guarantor Financial Information [Abstract]
2023 Senior Notes	$ 720.0
2025 Senior Notes	$ 500.0

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SUPPLEMENTAL GUARANTOR FINANCIAL INFORMATION SUPPLEMENTAL GUARANTOR FINANCIAL INFORMATION (Balance Sheet) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Supplemental Guarantor Financial Information Balance Sheets [Line Items]
Cash and Cash Equivalents, at Carrying Value	$ 315.6	$ 392.0	$ 196.8	$ 256.8	$ 307.8	$ 165.2
Receivables, Net, Current	813.2	783.4	303.8	263.1
Due from Affiliate, Current	0.0	0.0	0.0	0.0
Income Taxes Receivable, Current	36.3	32.9	15.1	21.6
Inventory, Net	679.5	685.2	216.1	210.1
Deferred Tax Assets, Net, Current	0.0		54.0	54.2
Other Assets, Current	32.8	39.9	17.4	10.3
Assets, Current	1,877.4	1,933.4	803.2	816.1
Property, Plant and Equipment, Net	3,859.0	3,953.4	919.9	931.0
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	0.0	0.0	0.0	0.0
Deferred Tax Assets, Net, Noncurrent	107.4	95.9	12.9	12.5
Other Assets, Noncurrent	463.8	454.6	70.2	59.0
Due from Affiliate, Noncurrent		0.0
Intangible Assets, Net (Excluding Goodwill)	663.2	677.5	119.8	123.5
Goodwill	2,146.1	2,174.1	747.1	747.1	747.1
Assets	9,116.9	9,288.9	2,673.1	2,689.2
Long-term Debt, Current Maturities	205.1	205.0	16.4	16.4
Accounts Payable, Current	478.1	608.2	147.8	146.8
Due to Affiliate, Current	0.0	0.0	0.0	0.0
Accrued Income Taxes, Current	14.1	4.9	1.1	0.2
Accrued Liabilities, Current	352.3	328.1	205.1	214.3
Liabilities, Current	1,049.6	1,146.2	370.4	377.7
Long-term Debt, Excluding Current Maturities	3,627.9	3,643.8	648.7	649.8
Defined Benefit Pension Plan, Liabilities, Noncurrent	635.2	648.9	167.2	182.0
Deferred Tax Liabilities, Net, Noncurrent	1,091.0	1,095.2	107.3	107.1
Due to Affiliate, Noncurrent	0.0	0.0
Other Liabilities, Noncurrent	340.4	336.0	361.3	359.3
Liabilities	6,744.1	6,870.1	1,654.9	1,675.9
Commitments and contingencies
Common Stock, Value, Issued	165.2	165.1	77.5	77.4
Additional Paid in Capital, Common Stock	2,238.9	2,236.4	792.1	788.3
Accumulated Other Comprehensive Income (Loss), Net of Tax	(470.2)	(492.5)	(439.7)	(443.1)	(365.1)	(371.3)
Retained Earnings (Accumulated Deficit)	438.9	509.8	588.3	590.7
Stockholders' Equity Attributable to Parent	2,372.8	2,418.8	1,018.2	1,013.3	1,101.1	998.4
Liabilities and Equity	9,116.9	9,288.9	2,673.1	2,689.2
Parent Company [Member]
Supplemental Guarantor Financial Information Balance Sheets [Line Items]
Cash and Cash Equivalents, at Carrying Value	19.8	119.4	179.2	239.4	296.8	133.3
Receivables, Net, Current	119.3	107.7	130.0	107.3
Due from Affiliate, Current	0.0	0.0	0.0	0.0
Income Taxes Receivable, Current	35.3	34.6	15.1	21.4
Inventory, Net	173.3	166.0	149.1	136.1
Deferred Tax Assets, Net, Current	0.0	0.0	42.6	41.9
Other Assets, Current	150.7	152.1	111.9	99.0
Assets, Current	498.4	579.8	627.9	645.1
Property, Plant and Equipment, Net	501.4	508.7	503.7	505.3
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	5,970.8	5,905.0	1,694.2	1,683.9
Deferred Tax Assets, Net, Noncurrent	170.8	0.0	64.1	61.2
Other Assets, Noncurrent	42.8	43.5	60.1	48.4
Due from Affiliate, Noncurrent	0.0	0.0
Intangible Assets, Net (Excluding Goodwill)	0.1	0.5	0.5	0.5
Goodwill	0.0	0.0	0.0	0.0
Assets	7,184.3	7,037.5	2,950.5	2,944.4
Long-term Debt, Current Maturities	192.9	192.8	4.2	4.2
Accounts Payable, Current	45.9	36.1	60.7	54.0
Due to Affiliate, Current	1,459.5	966.0	622.7	617.1
Accrued Income Taxes, Current	2.5	2.7	1.1	0.2
Accrued Liabilities, Current	267.8	227.8	135.5	137.0
Liabilities, Current	1,968.6	1,425.4	824.2	812.5
Long-term Debt, Excluding Current Maturities	1,067.7	1,084.0	623.9	624.9
Defined Benefit Pension Plan, Liabilities, Noncurrent	182.4	484.3	165.0	179.1
Deferred Tax Liabilities, Net, Noncurrent	8.6	32.5	0.0	0.0
Due to Affiliate, Noncurrent	1,291.8	1,296.4
Other Liabilities, Noncurrent	292.4	296.1	319.2	314.6
Liabilities	4,811.5	4,618.7	1,932.3	1,931.1
Commitments and contingencies
Common Stock, Value, Issued	165.2	165.1	77.5	77.4
Additional Paid in Capital, Common Stock	2,238.9	2,236.4	792.0	788.3
Accumulated Other Comprehensive Income (Loss), Net of Tax	(470.2)	(492.5)	(440.0)	(443.1)
Retained Earnings (Accumulated Deficit)	438.9	509.8	588.0	590.7
Stockholders' Equity Attributable to Parent	2,372.8	2,418.8	1,018.0	1,013.3
Liabilities and Equity	7,184.3	7,037.5	2,951.0	2,944.4
Subsidiary Issuer [Member]
Supplemental Guarantor Financial Information Balance Sheets [Line Items]
Cash and Cash Equivalents, at Carrying Value	0.0	0.0	0.0	0.0	0.0	0.0
Receivables, Net, Current	0.0	0.0	0.0	0.0
Due from Affiliate, Current		0.0	0.0
Income Taxes Receivable, Current	0.0	0.0	0.0	0.0
Inventory, Net	0.0	0.0	0.0	0.0
Deferred Tax Assets, Net, Current	0.0	0.0	0.0	0.0
Other Assets, Current	5.0	5.0	0.0	0.0
Assets, Current	5.0	5.0	0.0	0.0
Property, Plant and Equipment, Net	0.0	0.0	0.0	0.0
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	3,675.2	3,636.3	0.0	0.0
Deferred Tax Assets, Net, Noncurrent	0.0	0.0	0.0	0.0
Other Assets, Noncurrent	0.0	0.0	0.0	0.0
Due from Affiliate, Noncurrent	2,553.2	2,562.6
Intangible Assets, Net (Excluding Goodwill)	0.0	0.0	0.0	0.0
Goodwill	985.4	990.2	0.0	0.0
Assets	7,218.8	7,194.1	0.0	0.0
Long-term Debt, Current Maturities	0.0	0.0	0.0	0.0
Accounts Payable, Current	0.0	0.0	0.0	0.0
Due to Affiliate, Current	39.4	29.0
Accrued Income Taxes, Current	0.0	0.0	0.0	0.0
Accrued Liabilities, Current	0.0	0.0	0.0	0.0
Liabilities, Current	39.4	29.0	0.0	0.0
Long-term Debt, Excluding Current Maturities	2,547.8	2,547.4	0.0	0.0
Defined Benefit Pension Plan, Liabilities, Noncurrent	0.0	0.0	0.0	0.0
Deferred Tax Liabilities, Net, Noncurrent	189.7	189.7	0.0	0.0
Due to Affiliate, Noncurrent	281.7	286.5
Other Liabilities, Noncurrent	0.0	0.0	0.0	0.0
Liabilities	3,058.6	3,052.6	0.0	0.0
Commitments and contingencies
Common Stock, Value, Issued	0.0	0.0	0.0	0.0
Additional Paid in Capital, Common Stock	4,146.1	4,146.1	0.0	0.0
Accumulated Other Comprehensive Income (Loss), Net of Tax	0.0	0.0	0.0	0.0
Retained Earnings (Accumulated Deficit)	14.1	(4.6)	0.0	0.0
Stockholders' Equity Attributable to Parent	4,160.2	4,141.5	0.0	0.0
Liabilities and Equity	7,218.8	7,194.1	0.0	0.0
Non-Guarantor Subsidiaries [Member]
Supplemental Guarantor Financial Information Balance Sheets [Line Items]
Cash and Cash Equivalents, at Carrying Value	295.8	272.6	17.6	17.4	11.0	31.9
Receivables, Net, Current	693.9	679.4	173.8	155.8
Due from Affiliate, Current	1,498.9	995.0	622.7	617.1
Income Taxes Receivable, Current	1.0	1.5	0.0	0.2
Inventory, Net	506.2	519.2	67.0	74.0
Deferred Tax Assets, Net, Current	2.6	2.7	11.4	12.3
Other Assets, Current	6.2	4.6	2.2	1.9
Assets, Current	3,004.6	2,475.0	894.7	878.7
Property, Plant and Equipment, Net	3,357.6	3,444.7	416.2	425.7
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	0.0	0.0	0.0	0.0
Deferred Tax Assets, Net, Noncurrent	0.0	104.6	0.0	0.0
Other Assets, Noncurrent	421.0	411.1	10.1	10.6
Due from Affiliate, Noncurrent	0.0	0.0
Intangible Assets, Net (Excluding Goodwill)	663.1	677.0	119.3	123.0
Goodwill	1,160.7	1,183.9	747.1	747.1
Assets	8,607.0	8,296.3	2,187.4	2,185.1
Long-term Debt, Current Maturities	12.2	12.2	12.2	12.2
Accounts Payable, Current	432.2	576.6	87.7	93.4
Due to Affiliate, Current	0.0	0.0	0.0	0.0
Accrued Income Taxes, Current	14.2	8.1	0.0	0.0
Accrued Liabilities, Current	213.6	221.3	165.7	167.3
Liabilities, Current	672.2	818.2	265.6	272.9
Long-term Debt, Excluding Current Maturities	12.4	12.4	24.8	24.9
Defined Benefit Pension Plan, Liabilities, Noncurrent	452.8	164.6	2.2	2.9
Deferred Tax Liabilities, Net, Noncurrent	892.7	881.7	158.5	155.8
Due to Affiliate, Noncurrent	979.7	979.7
Other Liabilities, Noncurrent	111.4	39.9	42.1	44.7
Liabilities	3,121.2	2,896.5	493.2	501.2
Commitments and contingencies
Common Stock, Value, Issued	14.6	14.6	15.0	14.6
Additional Paid in Capital, Common Stock	4,790.3	4,789.6	1,221.0	1,221.2
Accumulated Other Comprehensive Income (Loss), Net of Tax	(7.2)	(31.7)	(20.1)	(19.0)
Retained Earnings (Accumulated Deficit)	688.1	627.3	478.0	467.1
Stockholders' Equity Attributable to Parent	5,485.8	5,399.8	1,694.0	1,683.9
Liabilities and Equity	8,607.0	8,296.3	2,187.4	2,185.1
Consolidation, Eliminations [Member]
Supplemental Guarantor Financial Information Balance Sheets [Line Items]
Cash and Cash Equivalents, at Carrying Value	0.0	0.0	0.0	0.0	$ 0.0	$ 0.0
Receivables, Net, Current	0.0	(3.7)	0.0	0.0
Due from Affiliate, Current	(1,498.9)	(995.0)	(622.7)	(617.1)
Income Taxes Receivable, Current	0.0	(3.2)	0.0	0.0
Inventory, Net	0.0	0.0	0.0	0.0
Deferred Tax Assets, Net, Current	(2.6)	(2.7)	0.0	0.0
Other Assets, Current	(129.1)	(121.8)	(96.7)	(90.6)
Assets, Current	(1,630.6)	(1,126.4)	(719.4)	(707.7)
Property, Plant and Equipment, Net	0.0	0.0	0.0	0.0
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	(9,646.0)	(9,541.3)	(1,694.2)	(1,683.9)
Deferred Tax Assets, Net, Noncurrent	(63.4)	(8.7)	(51.2)	(48.7)
Other Assets, Noncurrent	0.0	0.0	0.0	0.0
Due from Affiliate, Noncurrent	(2,553.2)	(2,562.6)
Intangible Assets, Net (Excluding Goodwill)	0.0	0.0	0.0	0.0
Goodwill	0.0	0.0	0.0	0.0
Assets	(13,893.2)	(13,239.0)	(2,464.8)	(2,440.3)
Long-term Debt, Current Maturities	0.0	0.0	0.0	0.0
Accounts Payable, Current	0.0	(4.5)	(0.6)	(0.6)
Due to Affiliate, Current	(1,498.9)	(995.0)	(622.7)	(617.1)
Accrued Income Taxes, Current	(2.6)	(5.9)	0.0	0.0
Accrued Liabilities, Current	(129.1)	(121.0)	(96.1)	(90.0)
Liabilities, Current	(1,630.6)	(1,126.4)	(719.4)	(707.7)
Long-term Debt, Excluding Current Maturities	0.0	0.0	0.0	0.0
Defined Benefit Pension Plan, Liabilities, Noncurrent	0.0	0.0	0.0	0.0
Deferred Tax Liabilities, Net, Noncurrent	0.0	(8.7)	(51.2)	(48.7)
Due to Affiliate, Noncurrent	(2,553.2)	(2,562.6)
Other Liabilities, Noncurrent	(63.4)	0.0	0.0	0.0
Liabilities	(4,247.2)	(3,697.7)	(770.6)	(756.4)
Commitments and contingencies
Common Stock, Value, Issued	(14.6)	(14.6)	(15.0)	(14.6)
Additional Paid in Capital, Common Stock	(8,936.4)	(8,935.7)	(1,221.0)	(1,221.2)
Accumulated Other Comprehensive Income (Loss), Net of Tax	7.2	31.7	20.0	19.0
Retained Earnings (Accumulated Deficit)	(702.2)	(622.7)	(478.0)	(467.1)
Stockholders' Equity Attributable to Parent	(9,646.0)	(9,541.3)	(1,694.2)	(1,683.9)
Liabilities and Equity	$ (13,893.2)	$ (13,239.0)	$ (2,465.0)	$ (2,440.3)

XML

SUPPLEMENTAL GUARANTOR FINANCIAL INFORMATION SUPPLEMENTAL GUARANTOR FINANCIAL INFORMATION (Statements of Operations) - USD ($) $ in Millions	3 Months Ended									12 Months Ended			62 Months Ended	65 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Mar. 31, 2016
Supplemental Guarantor Financial Information Statement of Operations [Line Items]
Sales	$ 1,348.2	$ 1,267.4	$ 533.6	$ 535.4	$ 518.0	$ 499.8	$ 593.6	$ 570.4	$ 577.4	$ 2,854.4	$ 2,241.2	$ 2,515.0
Cost of goods sold	1,175.4	1,148.1	460.0	445.5	433.2	421.9	492.3	463.6	475.4	2,486.8	1,853.2	2,033.7
Selling and administration	88.1				47.0					186.5	166.2	190.0
Restructuring charges	92.8				1.2					2.7	15.7	5.5	$ 77.3	$ 129.5
Acquisition-related costs	10.2				10.4					123.4	4.2	0.0
Other operating income	10.9									45.7	1.5	0.7
Other operating income	10.9				(0.2)					45.7	1.5	0.7
Operating Income (Loss)	(7.4)				26.0					100.7	203.4	286.5
Earnings of non-consolidated affiliates	(0.2)				(0.4)					(1.7)	(1.7)	(2.8)
Income Loss From Equity Method Investments Consolidating Subsidiaries	0.0				0.0					0.0	0.0	0.0
Interest Expense	48.5				7.1					97.0	43.8	38.6
Interest income	0.3				0.3					1.1	1.3	0.6
Other income (expense)										0.2	0.1	(1.3)
Net (loss) income	(55.4)				19.6					6.7	162.7	250.0
Income tax provision	(17.5)				6.5					8.1	57.7	71.4
Income (Loss) from Continuing Operations Attributable to Parent						12.8	26.1	36.6	29.5	(1.4)	105.0	178.6
Income from discontinued operations, net						0.0	0.0	0.7	0.0	0.0	0.7	0.0
Net income	(37.9)	$ (62.7)	$ 5.9	$ 42.3	13.1	$ 12.8	$ 26.1	$ 37.3	$ 29.5	(1.4)	105.7	178.6
Parent Company [Member]
Supplemental Guarantor Financial Information Statement of Operations [Line Items]
Sales	320.7				323.1					1,215.4	1,373.2	1,379.4
Cost of goods sold	275.3				274.7					1,057.8	1,148.1	1,159.3
Selling and administration	36.8				35.3					110.4	90.8	132.8
Restructuring charges	0.3				0.0					0.7	4.8	5.5
Acquisition-related costs	10.2				10.4					117.9	4.2	0.0
Other operating income	(0.5)									(4.0)	0.9	0.6
Other operating income					(0.6)
Operating Income (Loss)	(2.4)				2.1					(75.4)	126.2	82.4
Earnings of non-consolidated affiliates	(0.2)				(0.4)					(1.7)	(1.7)	(2.8)
Income Loss From Equity Method Investments Consolidating Subsidiaries	(28.8)				15.1					90.2	48.8	129.8
Interest Expense	10.7				7.9					60.9	47.0	37.8
Interest income	0.8				0.8					3.1	2.5	4.4
Other income (expense)										0.4	0.1	(0.1)
Net (loss) income	(40.9)				10.5					(40.9)	132.3	181.5
Income tax provision	(3.0)				(2.6)					(39.5)	27.3	2.9
Income (Loss) from Continuing Operations Attributable to Parent											105.0
Income from discontinued operations, net											0.7
Net income	(37.9)				13.1					(1.4)	105.7	178.6
Non-Guarantor Subsidiaries [Member]
Supplemental Guarantor Financial Information Statement of Operations [Line Items]
Sales	1,141.3				289.4					2,002.5	1,285.5	1,569.6
Cost of goods sold	1,013.9				253.0					1,792.5	1,122.6	1,308.4
Selling and administration	51.3				11.7					76.1	75.4	57.2
Restructuring charges	92.5				1.2					2.0	10.9	0.0
Acquisition-related costs	0.0				0.0					5.5	0.0	0.0
Other operating income	11.4									49.7	0.6	0.1
Other operating income					0.4
Operating Income (Loss)	(5.0)				23.9					176.1	77.2	204.1
Earnings of non-consolidated affiliates	0.0				0.0					0.0	0.0	0.0
Income Loss From Equity Method Investments Consolidating Subsidiaries	0.0				0.0					0.0	0.0	0.0
Interest Expense	1.0				0.5					4.5	1.3	7.9
Interest income	0.9				0.8					3.4	3.3	3.3
Other income (expense)										(0.2)	0.0	(1.2)
Net (loss) income	(5.1)				24.2					174.8	79.2	198.3
Income tax provision	(1.2)				9.1					60.3	30.4	68.5
Income (Loss) from Continuing Operations Attributable to Parent											48.8
Income from discontinued operations, net											0.0
Net income	(3.9)				15.1					114.5	48.8	129.8
Subsidiary Issuer [Member]
Supplemental Guarantor Financial Information Statement of Operations [Line Items]
Sales	0.0				0.0					0.0	0.0	0.0
Cost of goods sold	0.0				0.0					0.0	0.0	0.0
Selling and administration	0.0				0.0					0.0	0.0	0.0
Restructuring charges	0.0				0.0					0.0	0.0	0.0
Acquisition-related costs	0.0				0.0					0.0	0.0	0.0
Other operating income	0.0									0.0	0.0	0.0
Other operating income					0.0
Operating Income (Loss)	0.0				0.0					0.0	0.0	0.0
Earnings of non-consolidated affiliates	0.0				0.0					0.0	0.0	0.0
Income Loss From Equity Method Investments Consolidating Subsidiaries	43.6				0.0					19.7	0.0	0.0
Interest Expense	38.2				0.0					37.0	0.0	0.0
Interest income	0.0				0.0					0.0	0.0	0.0
Other income (expense)										0.0	0.0	0.0
Net (loss) income	5.4				0.0					(17.3)	0.0	0.0
Income tax provision	(13.3)				0.0					(12.8)	0.0	0.0
Income (Loss) from Continuing Operations Attributable to Parent											0.0
Income from discontinued operations, net											0.0
Net income	18.7				0.0					(4.6)	0.0	0.0
Consolidation, Eliminations [Member]
Supplemental Guarantor Financial Information Statement of Operations [Line Items]
Sales	(113.8)				(94.5)					(363.5)	(417.5)	(434.0)
Cost of goods sold	(113.8)				(94.5)					(363.5)	(417.5)	(434.0)
Selling and administration	0.0				0.0					0.0	0.0	0.0
Restructuring charges	0.0				0.0					0.0	0.0	0.0
Acquisition-related costs	0.0				0.0					0.0	0.0	0.0
Other operating income	0.0									0.0	0.0	0.0
Other operating income					0.0
Operating Income (Loss)	0.0				0.0					0.0	0.0	0.0
Earnings of non-consolidated affiliates	0.0				0.0					0.0	0.0	0.0
Income Loss From Equity Method Investments Consolidating Subsidiaries	(14.8)				(15.1)					(109.9)	(48.8)	(129.8)
Interest Expense	(1.4)				(1.3)					(5.4)	(4.5)	(7.1)
Interest income	(1.4)				(1.3)					(5.4)	(4.5)	(7.1)
Other income (expense)										0.0	0.0	0.0
Net (loss) income	(14.8)				(15.1)					(109.9)	(48.8)	(129.8)
Income tax provision	0.0				0.0					0.0	0.0	0.0
Income (Loss) from Continuing Operations Attributable to Parent											(48.8)
Income from discontinued operations, net											0.0
Net income	$ (14.8)				$ (15.1)					$ (109.9)	$ (48.8)	$ (129.8)

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SUPPLEMENTAL GUARANTOR FINANCIAL INFORMATION SUPPLEMENTAL GUARANTOR FINANCIAL INFORMATION (Statements of Comprehensive Income) - USD ($) $ in Millions	3 Months Ended									12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
SupplementalGuarantorFinancialInformationStatementsOfComprehensiveIncome [Line Items]
Net income	$ (37.9)	$ (62.7)	$ 5.9	$ 42.3	$ 13.1	$ 12.8	$ 26.1	$ 37.3	$ 29.5	$ (1.4)	$ 105.7	$ 178.6
Foreign currency translation adjustments, net	15.5				(1.4)					(9.8)	(1.8)	(2.6)
Unrealized losses on derivative contracts, net	3.0				(0.3)					(2.7)	(5.1)	(3.8)
Pension and postretirement liability adjustments, net										(78.8)	(86.6)	(7.7)
Amortization of prior service costs and actuarial losses, net	3.8				5.1					41.9	15.5	20.3
Total other comprehensive (loss) income, net of tax	22.3				3.4					(49.4)	(78.0)	6.2
Comprehensive (loss) income	(15.6)				16.5					(50.8)	27.7	184.8
Parent Company [Member]
SupplementalGuarantorFinancialInformationStatementsOfComprehensiveIncome [Line Items]
Net income	(37.9)				13.1					(1.4)	105.7	178.6
Foreign currency translation adjustments, net	15.5				(1.4)					(9.8)	(1.8)	(2.6)
Unrealized losses on derivative contracts, net	3.0				(0.3)					(2.7)	(5.1)	(3.8)
Pension and postretirement liability adjustments, net										(78.8)	(86.6)	(7.7)
Amortization of prior service costs and actuarial losses, net	3.8				5.1					41.9	15.5	20.3
Total other comprehensive (loss) income, net of tax	22.3				3.4					(49.4)	(78.0)	6.2
Comprehensive (loss) income	(15.6)				16.5					(50.8)	27.7	184.8
Subsidiary Issuer [Member]
SupplementalGuarantorFinancialInformationStatementsOfComprehensiveIncome [Line Items]
Net income	18.7				0.0					(4.6)	0.0	0.0
Foreign currency translation adjustments, net	0.0				0.0					0.0	0.0	0.0
Unrealized losses on derivative contracts, net	0.0				0.0					0.0	0.0	0.0
Pension and postretirement liability adjustments, net										0.0	0.0	0.0
Amortization of prior service costs and actuarial losses, net	0.0				0.0					0.0	0.0	0.0
Total other comprehensive (loss) income, net of tax	0.0				0.0					0.0	0.0	0.0
Comprehensive (loss) income	18.7				0.0					(4.6)	0.0	0.0
Non-Guarantor Subsidiaries [Member]
SupplementalGuarantorFinancialInformationStatementsOfComprehensiveIncome [Line Items]
Net income	(3.9)				15.1					114.5	48.8	129.8
Foreign currency translation adjustments, net	15.5				(1.4)					(9.8)	(1.8)	(2.6)
Unrealized losses on derivative contracts, net	0.0				0.0					0.0	0.0	0.0
Pension and postretirement liability adjustments, net										(5.1)	(3.2)	(1.4)
Amortization of prior service costs and actuarial losses, net	0.5				0.4					2.3	1.4	1.1
Total other comprehensive (loss) income, net of tax	16.0				(1.0)					(12.6)	(3.6)	(2.9)
Comprehensive (loss) income	12.1				14.1					101.9	45.2	126.9
Consolidation, Eliminations [Member]
SupplementalGuarantorFinancialInformationStatementsOfComprehensiveIncome [Line Items]
Net income	(14.8)				(15.1)					(109.9)	(48.8)	(129.8)
Foreign currency translation adjustments, net	(15.5)				1.4					9.8	1.8	2.6
Unrealized losses on derivative contracts, net	0.0				0.0					0.0	0.0	0.0
Pension and postretirement liability adjustments, net										5.1	3.2	1.4
Amortization of prior service costs and actuarial losses, net	(0.5)				(0.4)					(2.3)	(1.4)	(1.1)
Total other comprehensive (loss) income, net of tax	(16.0)				1.0					12.6	3.6	2.9
Comprehensive (loss) income	$ (30.8)				$ (14.1)					$ (97.3)	$ (45.2)	$ (126.9)

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SUPPLEMENTAL GUARANTOR FINANCIAL INFORMATION SUPPLEMENTAL GUARANTOR FINANCIAL INFORMATION (Cash Flows) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
SupplementalGuarantorFinancialInformationStatementsOfCashFlows [Line Items]
Net Cash Provided by (Used in) Operating Activities	$ 47.0	$ (9.6)	$ 217.1	$ 159.2	$ 317.0
Capital expenditures	(76.1)	(23.3)	(130.9)	(71.8)	(90.8)
Proceeds from sale/leaseback of equipment			0.0	0.0	35.8
Business acquired and related transactions, net of cash acquired			(408.1)	0.0	0.0
Proceeds from disposition of property, plant and equipment	0.1	0.6	26.2	5.6	4.6
Increase (Decrease) in Restricted Cash			0.0	4.2	7.7
Payments for (Proceeds from) Other Investing Activities	0.0	(1.4)	0.0	0.3	(2.6)
Net Cash Provided by (Used in) Investing Activities	(73.8)	(21.9)	(504.0)	(61.7)	(43.8)
Proceeds from Contributions from Affiliates	2.2	2.2	8.8	0.0	1.5
Distributions from consolidated subsidiaries					0.0
Borrowings			1,275.0	150.0	0.0
Repayments	(17.1)	(1.0)	(730.7)	(162.4)	(23.7)
Financing portion of earn out payment - SunBelt			0.0	(14.8)	(17.1)
Effect of exchange rate changes on cash and cash equivalents	0.5	0.0	(0.1)	0.0	0.0
Cash and Cash Equivalents, at Carrying Value	315.6	196.8	392.0	256.8	307.8	$ 165.2
Payments for Repurchase of Common Stock			0.0	(64.8)	(36.2)
Stock options exercised	0.0	2.0	2.2	6.6	8.8
Excess tax benefits from stock-based compensation	0.0	0.3	0.4	1.1	1.6
Payments of Dividends	(33.0)	(15.5)	(79.5)	(63.0)	(64.0)
Payment of Financing and Stock Issuance Costs	0.0	(14.3)	(45.2)	(1.2)	0.0
Intercompany Financing Activities	0.0		0.0	0.0	0.0
Net Cash Provided by (Used in) Financing Activities	(50.1)	(28.5)	422.2	(148.5)	(130.6)
Cash and Cash Equivalents, Period Increase (Decrease)	(76.4)	(60.0)	135.2	(51.0)	142.6
Parent Company [Member]
SupplementalGuarantorFinancialInformationStatementsOfCashFlows [Line Items]
Net Cash Provided by (Used in) Operating Activities	(35.5)	(15.5)	(70.6)	134.7	336.9
Capital expenditures	(16.2)	(18.6)	(74.0)	(51.3)	(63.6)
Proceeds from sale/leaseback of equipment					0.0
Business acquired and related transactions, net of cash acquired			(408.1)
Proceeds from disposition of property, plant and equipment	0.0	0.2	1.7	3.5	3.7
Increase (Decrease) in Restricted Cash				4.2	7.7
Payments for (Proceeds from) Other Investing Activities		0.0		0.0	0.0
Net Cash Provided by (Used in) Investing Activities	(14.0)	(16.2)	(471.6)	(43.6)	(42.8)
Proceeds from Contributions from Affiliates	2.2	2.2	8.8		1.5
Distributions from consolidated subsidiaries					7.9
Borrowings			1,275.0	150.0
Repayments	(0.2)	(1.0)	(149.5)	(150.2)	(11.5)
Financing portion of earn out payment - SunBelt				0.0	0.0
Effect of exchange rate changes on cash and cash equivalents	0.0		0.0
Cash and Cash Equivalents, at Carrying Value	19.8	179.2	119.4	239.4	296.8	133.3
Payments for Repurchase of Common Stock				(64.8)	(36.2)
Stock options exercised		2.0	2.2	6.6	8.8
Excess tax benefits from stock-based compensation		0.3	0.4	1.1	1.6
Payments of Dividends	(33.0)	(15.5)	(79.5)	(63.0)	(64.0)
Payment of Financing and Stock Issuance Costs		(14.3)	(35.2)	(1.2)
Intercompany Financing Activities	(16.9)		(591.2)	(27.0)	(29.3)
Net Cash Provided by (Used in) Financing Activities	(50.1)	(28.5)	422.2	(148.5)	(130.6)
Cash and Cash Equivalents, Period Increase (Decrease)	(99.6)	(60.2)	(120.0)	(57.4)	163.5
Subsidiary Issuer [Member]
SupplementalGuarantorFinancialInformationStatementsOfCashFlows [Line Items]
Net Cash Provided by (Used in) Operating Activities	0.0	0.0	0.0	0.0	0.0
Capital expenditures	0.0	0.0	0.0	0.0	0.0
Proceeds from sale/leaseback of equipment					0.0
Business acquired and related transactions, net of cash acquired			0.0
Proceeds from disposition of property, plant and equipment	0.0	0.0	0.0	0.0	0.0
Increase (Decrease) in Restricted Cash				0.0	0.0
Payments for (Proceeds from) Other Investing Activities		0.0		0.0	0.0
Net Cash Provided by (Used in) Investing Activities	0.0	0.0	0.0	0.0	0.0
Proceeds from Contributions from Affiliates	0.0	0.0	0.0		0.0
Distributions from consolidated subsidiaries					0.0
Borrowings			0.0	0.0
Repayments	(16.9)	0.0	0.0	0.0	0.0
Financing portion of earn out payment - SunBelt				0.0	0.0
Effect of exchange rate changes on cash and cash equivalents	0.0		0.0
Cash and Cash Equivalents, at Carrying Value	0.0	0.0	0.0	0.0	0.0	0.0
Payments for Repurchase of Common Stock				0.0	0.0
Stock options exercised		0.0	0.0	0.0	0.0
Excess tax benefits from stock-based compensation		0.0	0.0	0.0	0.0
Payments of Dividends	0.0	0.0	0.0	0.0	0.0
Payment of Financing and Stock Issuance Costs		0.0	(10.0)	0.0
Intercompany Financing Activities	16.9		10.0
Net Cash Provided by (Used in) Financing Activities	0.0	0.0	0.0	0.0	0.0
Cash and Cash Equivalents, Period Increase (Decrease)	0.0	0.0	0.0	0.0	0.0
Non-Guarantor Subsidiaries [Member]
SupplementalGuarantorFinancialInformationStatementsOfCashFlows [Line Items]
Net Cash Provided by (Used in) Operating Activities	82.5	5.9	287.7	24.5	(19.9)
Capital expenditures	(59.9)	(4.7)	(56.9)	(20.5)	(27.2)
Proceeds from sale/leaseback of equipment					35.8
Business acquired and related transactions, net of cash acquired			0.0
Proceeds from disposition of property, plant and equipment	0.1	0.4	24.5	2.1	0.9
Increase (Decrease) in Restricted Cash				0.0	0.0
Payments for (Proceeds from) Other Investing Activities		(1.4)		0.3	(2.6)
Net Cash Provided by (Used in) Investing Activities	(59.8)	(5.7)	(32.4)	(18.1)	6.9
Proceeds from Contributions from Affiliates	0.0	0.0	0.0		0.0
Distributions from consolidated subsidiaries					0.0
Borrowings			0.0	0.0
Repayments	0.0	0.0	(581.2)	(12.2)	(12.2)
Financing portion of earn out payment - SunBelt				(14.8)	(17.1)
Effect of exchange rate changes on cash and cash equivalents	0.5		(0.1)
Cash and Cash Equivalents, at Carrying Value	295.8	17.6	272.6	17.4	11.0	31.9
Payments for Repurchase of Common Stock				0.0	0.0
Stock options exercised		0.0	0.0	0.0	0.0
Excess tax benefits from stock-based compensation		0.0	0.0	0.0	0.0
Payments of Dividends	0.0	0.0	0.0	0.0	(7.9)
Payment of Financing and Stock Issuance Costs		0.0	0.0	0.0
Intercompany Financing Activities	0.0		581.2	27.0	29.3
Net Cash Provided by (Used in) Financing Activities	0.0	0.0	0.0	0.0	(7.9)
Cash and Cash Equivalents, Period Increase (Decrease)	23.2	0.2	255.2	6.4	(20.9)
Consolidation, Eliminations [Member]
SupplementalGuarantorFinancialInformationStatementsOfCashFlows [Line Items]
Net Cash Provided by (Used in) Operating Activities	0.0	0.0	0.0	0.0	0.0
Capital expenditures	0.0	0.0	0.0	0.0	0.0
Proceeds from sale/leaseback of equipment					0.0
Business acquired and related transactions, net of cash acquired			0.0
Proceeds from disposition of property, plant and equipment	0.0	0.0	0.0	0.0	0.0
Increase (Decrease) in Restricted Cash				0.0	0.0
Payments for (Proceeds from) Other Investing Activities		0.0		0.0	0.0
Net Cash Provided by (Used in) Investing Activities	0.0	0.0	0.0	0.0	(7.9)
Proceeds from Contributions from Affiliates	0.0	0.0	0.0		0.0
Distributions from consolidated subsidiaries					(7.9)
Borrowings			0.0	0.0
Repayments	0.0	0.0	0.0	0.0	0.0
Financing portion of earn out payment - SunBelt				0.0	0.0
Effect of exchange rate changes on cash and cash equivalents	0.0		0.0
Cash and Cash Equivalents, at Carrying Value	0.0	0.0	0.0	0.0	0.0	$ 0.0
Payments for Repurchase of Common Stock				0.0	0.0
Stock options exercised		0.0	0.0	0.0	0.0
Excess tax benefits from stock-based compensation		0.0	0.0	0.0	0.0
Payments of Dividends	0.0	0.0	0.0	0.0	7.9
Payment of Financing and Stock Issuance Costs		0.0	0.0	0.0
Intercompany Financing Activities	0.0
Net Cash Provided by (Used in) Financing Activities	0.0	0.0	0.0	0.0	7.9
Cash and Cash Equivalents, Period Increase (Decrease)	$ 0.0	$ 0.0	$ 0.0	$ 0.0	$ 0.0