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Long-Term Debt (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Total debt $ 674.2 $ 674.9
Current portion of long-term debt and capital lease obligations (126.5) (1.4)
Long-term debt, net of current portion $ 547.7 $ 673.5
6.5% Senior Notes due 2022    
Debt Instrument [Line Items]    
Stated interest rate (as a percent) 6.50% 6.50%
Senior Notes | 6.5% Senior Notes due 2022    
Debt Instrument [Line Items]    
Total debt $ 500.0 $ 500.0
Line of Credit | CRNF credit facility    
Debt Instrument [Line Items]    
Total debt 125.0 125.0
Capital Lease Obligations    
Debt Instrument [Line Items]    
Total debt $ 49.2 $ 49.9