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Long-Term Debt - Schedule of Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Total debt $ 1,192.2 $ 1,194.1
Unamortized debt issuance cost (12.2) (14.2)
Unamortized debt discount (13.5) (15.3)
Current portion of long-term debt and capital lease obligations (2.1) (1.8)
Long-term debt, net of current portion 1,164.4 1,162.8
Senior Notes | 6.5% Senior Notes due 2022    
Debt Instrument [Line Items]    
Total debt $ 500.0 500.0
Stated interest rate 6.50%  
Senior Notes | 9.25% Senior Notes due 2023    
Debt Instrument [Line Items]    
Total debt $ 645.0 645.0
Stated interest rate 9.25%  
Senior Notes | 6.5% Notes due 2021    
Debt Instrument [Line Items]    
Total debt $ 2.2 2.2
Stated interest rate 6.50%  
Capital Lease Obligations    
Debt Instrument [Line Items]    
Total debt $ 45.0 $ 46.9