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Long-Term Debt - Schedule of Debt (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Total debt $ 673.1 $ 673.5
Unamortized debt issuance cost (6.0) (6.4)
Current portion of long-term debt and capital lease obligations (126.7) (126.4)
Long-term debt, net of current portion 540.4 540.7
Senior Notes | 6.5% Senior Notes due 2022    
Debt Instrument [Line Items]    
Total debt $ 500.0 $ 500.0
Stated interest rate (as a percent) 6.50% 6.50%
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 $ 48.1 $ 48.5