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Goodwill and Intangible Assets - Schedule Of Estimated Future Amortization Expense Of Intangible Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
2019 $ 15.9  
2020 15.8  
2021 12.5  
2022 10.1  
2023 6.2  
2024 and thereafter 6.2  
Net Carrying Amount $ 66.7 $ 26.0