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Debt - Schedule of the Company's Debt (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Unamortized debt issuance costs $ (9.1) $ (10.3)
Total debt 397.2 458.3
Less: current portion 0.0 0.0
Long-term debt 397.2 458.3
8.25% Senior Notes Due October 15, 2024    
Debt Instrument [Line Items]    
Senior Unsecured notes 300.0 300.0
Senior Secured Term Loan B Facility    
Debt Instrument [Line Items]    
Credit facility 106.3 168.6
Revolving Credit Facility    
Debt Instrument [Line Items]    
Credit facility $ 0.0 $ 0.0