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Goodwill and Intangible Assets - Amortization Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization expense $ 61.9 $ 62.6 $ 62.2
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]      
2021 64.1    
2022 64.1    
2023 63.7    
2024 62.2    
2025 $ 61.7