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Long-Term Debt Long-Term Debt (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Long-term debt	$ 674.6	$ 674.9
Capital lease obligations	49.6	49.9
6.5% Senior Notes due 2022
Debt Instrument [Line Items]
Long-term debt	500.0	500.0
Stated interest rate (as a percent)	6.50%	6.50%
CRNF credit facility
Debt Instrument [Line Items]
Long-term debt	$ 125.0	$ 125.0

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date.

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