FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Mar. 31, 2015
4.625 Notes
Carrying amount and estimated fair values of debt
Interest rate (as a percent)	4.625%	4.625%
4.875 Notes
Carrying amount and estimated fair values of debt
Interest rate (as a percent)	4.875%	4.875%
Term Loan Due 2017
Carrying amount and estimated fair values of debt
Debt issuance costs	$ 1.8
Term Loan Due 2022
Carrying amount and estimated fair values of debt
Interest rate (as a percent)		4.00%
Debt issuance costs and discounts		2.9
Carrying Amount \| Level 1 \| 4.625 Notes
Carrying amount and estimated fair values of debt
Long-term debt	688.0	688.0
Carrying Amount \| Level 1 \| 4.875 Notes
Carrying amount and estimated fair values of debt
Long-term debt	450.0	450.0
Carrying Amount \| Level 2 \| Commodity contracts
Carrying amount and estimated fair values of debt
Commodity purchase contracts	(12.9)	(5.4)
Carrying Amount \| Level 2 \| Term Loan Due 2017
Carrying amount and estimated fair values of debt
Long-term debt	192.6
Carrying Amount \| Level 2 \| Term Loan Due 2022
Carrying amount and estimated fair values of debt
Long-term debt		246.5
Fair Value \| Level 1 \| 4.625 Notes
Carrying amount and estimated fair values of debt
Long-term debt	651.9	681.1
Fair Value \| Level 1 \| 4.875 Notes
Carrying amount and estimated fair values of debt
Long-term debt	426.7	446.9
Fair Value \| Level 2 \| Commodity contracts
Carrying amount and estimated fair values of debt
Commodity purchase contracts	(12.9)	(5.4)
Fair Value \| Level 2 \| Term Loan Due 2017
Carrying amount and estimated fair values of debt
Long-term debt	194.4
Fair Value \| Level 2 \| Term Loan Due 2022
Carrying amount and estimated fair values of debt
Long-term debt		246.4

Represents the amount of debt issuance costs and discounts.

No definition available.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

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-Name Accounting Standards Codification

-Topic 815

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-Section 45

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

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-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13495-108611

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (c)

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-Paragraph 10

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

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- Definition

The cash outflow for loan and debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

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