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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2014	Feb. 02, 2013
Carrying amount and estimated fair values of debt
Debt issuance costs	$ 2.4us-gaap_PaymentsOfFinancingCosts
4.625 Notes
Carrying amount and estimated fair values of debt
Interest rate (as a percent)		4.625%
4.875 Notes
Carrying amount and estimated fair values of debt
Interest rate (as a percent)		4.875%
9.0 percent notes
Carrying amount and estimated fair values of debt
Interest rate (as a percent)			9.00%
Level 2 \| Term Loan
Carrying amount and estimated fair values of debt
Debt issuance costs	2.4	1.8
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)
Carrying Amount \| Level 2 \| Term Loan
Carrying amount and estimated fair values of debt
Long-term debt	194.8	192.6
Fair Value \| Level 1 \| 4.625 Notes
Carrying amount and estimated fair values of debt
Long-term debt	676.4	651.9
Fair Value \| Level 1 \| 4.875 Notes
Carrying amount and estimated fair values of debt
Long-term debt	426.9	426.7
Fair Value \| Level 2 \| Commodity contracts
Carrying amount and estimated fair values of debt
Commodity purchase contracts		(12.9)
Fair Value \| Level 2 \| Term Loan
Carrying amount and estimated fair values of debt
Long-term debt	$ 199.0	$ 194.4