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Goodwill and Intangibles - Schedule of Future Amortization Expense (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]            
2018 remaining $ 2.4          
2018 8.9          
2019 8.1          
2020 7.5          
2021 6.9          
Thereafter 25.5          
Finite-Lived Intangible Assets, Net $ 59.3 $ 45.6 $ 49.1 $ 50.9 $ 52.8 $ 9.6