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Intangible Assets - Schedule of Future Amortization Expense (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
Amortization expense $ 2.8 $ 1.8
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]    
2019 10.8  
2020 13.6  
2021 11.3  
2022 8.0  
2023 7.7  
Thereafter 6.0  
Total $ 57.4