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Amount of deferred purchase price acquisition costs due in the next fiscal year following the latest fiscal year.

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Amount of deferred purchase price acquisition costs due in the third fiscal year following the latest fiscal year.

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Amount of deferred purchase price acquisition costs due in the second fiscal year following the latest fiscal year.

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The amount recovered from insurance relating to business interruption.

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The cash inflow from the amounts received by the insured under the terms of an insurance contract settlement.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses.

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Amount due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer.

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Number of plaintiffs that have filed claims pertaining to a loss contingency.

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Cash outflow representing an adjustment to the purchase price of a previous acquisition.

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Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

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COMMITMENTS AND CONTINGENCIES (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended			1 Months Ended
	Dec. 31, 2014 item	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014
Letters of Credit
Outstanding letters of credit	$ 82.3	$ 79.8		$ 82.3
Purchase Commitments
Amount of prepaid long-term purchase commitments capitalized		9.1us-gaap_PrepaidExpenseNoncurrent
Aggregate amount of payments made under long-term raw material purchase agreements	80.1	96.1	110.9
Amount of raw material purchases	385.4
Account payable for raw material purchases	16.5			16.5
Deferred Acquisition Payments Abstract
Deferred acquisition payments	10.0us-gaap_PaymentsForPreviousAcquisition
Environmental Regulation
Accrual of remediation costs	54	64		54
Number of plant site locations	2us-gaap_NumberOfStores			2us-gaap_NumberOfStores
Number of full-time employees	6,000dei_EntityNumberOfEmployees			6,000dei_EntityNumberOfEmployees
Number of employees employed under collective bargaining agreements	1,600
Percentage of employees employed under collective bargaining agreements	27.00%
Current reserves for environmental contingencies	12	12		12
Involuntary conversion
Receivable from insurers	6.5			6.5
Merged Business
Deferred Acquisition Payments Abstract
Total deferred purchase price acquisition costs	50.0			50.0
Deferred acquisition payments	10.0
Future payments in 2015	10.0			10.0
Future payments in 2016	15.0			15.0
Future payments in 2017	15.0			15.0
RS Cogen
Purchase Commitments
Ownership interest (as a percent)	50.00%			50.00%
Future commitment per year to purchase electricity and steam from the joint venture	23.5
Aggregate future commitment to purchase electricity and steam from the joint venture	186.5			186.5
Purchases under future commitment	25.0	22.9
Minimum
Letters of Credit
Terms of letters of credit	1 month
Environmental Regulation
Potential additional loss contingencies	52			52
Maximum
Letters of Credit
Terms of letters of credit	1 year
Environmental Regulation
Potential additional loss contingencies	89			89
Natrium, West Virginia facility
Environmental Regulation
Accrual of remediation costs	15	14		15
Lake Charles, LA facility
Environmental Regulation
Accrual of remediation costs	18	25		18
Legal proceedings
Number of individuals that have filed lawsuits against the Company	2,615
Lake Charles, LA facility \| Insurance claims
Involuntary conversion
Insurance proceeds	14.3
Insurance proceeds reflected in cash flows from operating activities	10.4
Insurance proceeds reflected in cash flows from investing activities	3.9
Insurance recoveries				20.8
Lake Charles, LA facility \| Insurance claims \| Cost of sales
Involuntary conversion
Insurance recoveries	17.7
Insurance recoveries related to business interruption	16.9
Lake Charles, South facility
Environmental Regulation
Accrual of remediation costs	$ 15	$ 15		$ 15