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Goodwill and Intangible Assets - Future Amortization (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Estimated future amortization expense related to amortizable intangible asset:    
2020 $ 35.0  
2021 32.5  
2022 27.3  
2023 24.7  
2024 22.4  
Thereafter 91.3  
Net Carrying Amount, intangible assets subject to amortization $ 233.2 $ 218.7