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Long-Term Debt Long-Term Debt (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Long-term debt $ 674.2 $ 674.9
Capital lease obligations 49.2 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