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Goodwill and Intangible Assets - Future Amortization (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Estimated future amortization expense related to amortizable intangible asset:    
2019 $ 34.9  
2020 29.7  
2021 27.7  
2022 21.8  
2023 19.1  
Thereafter 85.5  
Net Carrying Amount, intangible assets subject to amortization $ 218.7 $ 81.8