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Long-Term Debt - Schedule of Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Total debt $ 1,194.1 $ 673.5
Unamortized debt issuance cost (14.2) (6.4)
Unamortized debt discount (15.3) 0.0
Current portion of long-term debt and capital lease obligations (1.8) (126.4)
Long-term debt, net of current portion 1,162.8 540.7
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%  
Senior Notes | 9.25% Senior Notes due 2023    
Debt Instrument [Line Items]    
Total debt $ 645.0 0.0
Stated interest rate (as a percent) 9.25%  
Senior Notes | 6.5% Notes due 2021    
Debt Instrument [Line Items]    
Total debt $ 2.2 0.0
Stated interest rate (as a percent) 6.50%  
Line of Credit | CRNF credit facility    
Debt Instrument [Line Items]    
Total debt $ 0.0 125.0
Capital Lease Obligations    
Debt Instrument [Line Items]    
Total debt $ 46.9 $ 48.5