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Goodwill and Identifiable Assets Future Amortization Expense (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2020 $ 47.8  
2021 39.1  
2022 33.9  
2023 26.6  
2024 21.5  
Thereafter 60.1  
Net Carrying Amount $ 229.0 $ 217.6