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Goodwill and Identifiable Intangibles (Amortization Expense and Estimated Future Amortization) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization of intangibles $ 35.4 $ 36.7 $ 35.6
Estimate Amortization Expense      
Estimated amortization expense, 2020 [1] 32.0    
Estimated amortization expense, 2021 [1] 28.4    
Estimated amortization expense, 2022 [1] 24.9    
Estimated amortization expense, 2023 [1] 22.6    
Estimated amortization expense, 2024 [1] $ 21.0    
[1]
Actual amounts of amortization expense may differ from estimated amounts due to changes in foreign currency exchange rates, additional intangible asset acquisitions, impairment of intangible assets, accelerated amortization of intangible assets and other events.