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Goodwill and Identifiable Assets Future Amortization Expense (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2020 $ 44.7  
2021 37.8  
2022 29.4  
2023 25.4  
2024 19.1  
Thereafter 61.2  
Net Carrying Amount $ 217.6 $ 226.5