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Debt - Schedule of Long-term Debt Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Sep. 30, 2017
Debt Instrument [Line Items]    
Long-term debt including current maturities $ 991.0 $ 992.0
Less current portion (4.0) (4.0)
Less unamortized debt discount and debt issuance fees (9.1) (9.5)
Total long-term debt 977.9 978.5
Secured Debt | Senior Secured Term Loan B Facility, Due 2022    
Debt Instrument [Line Items]    
Long-term debt including current maturities 391.0 392.0
Senior Notes | 5.50% Senior Notes due 2025    
Debt Instrument [Line Items]    
Long-term debt including current maturities $ 600.0 $ 600.0
Stated interest rate of debt 5.50%