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Goodwill and Identifiable Assets (Future Amortization Expense) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Remainder of 2020 $ 13.5  
2021 46.6  
2022 38.4  
2023 33.5  
2024 26.2  
Thereafter 79.7  
Net Carrying Amount $ 237.9 $ 217.6