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Goodwill and Identifiable Assets (Future Amortization Expense) (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Remainder of 2019 $ 23.6  
2020 38.1  
2021 32.6  
2022 24.9  
2023 21.7  
Thereafter 77.1  
Net Carrying Amount $ 218.0 $ 226.5