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Goodwill and Intangible Assets - Schedule of Estimated Amortization Expense (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]    
Three months ended December 31, 2019 $ 3.7  
2020 14.4  
2021 14.2  
2022 13.9  
2023 13.5  
Thereafter 98.5  
Net Amount $ 158.2 $ 168.1