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Goodwill and Identifiable Assets (Future Amortization Expense) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Remainder of 2019 $ 37.7  
2020 41.0  
2021 32.6  
2022 28.0  
2023 21.2  
Thereafter 67.7  
Net Carrying Amount $ 228.2 $ 217.6