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Goodwill and Identifiable Intangibles (Amortization Expense and Estimated Future Amortization) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
segment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization of intangibles $ 32.8 $ 35.4 $ 36.7
Estimate Amortization Expense      
Estimated amortization expense, 2021 [1] 46.3    
Estimated amortization expense, 2022 [1] 42.6    
Estimated amortization expense, 2023 [1] 40.2    
Estimated amortization expense, 2024 [1] 38.5    
Estimated amortization expense, 2025 [1] $ 36.8    
Number of reporting units | segment 3    
[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.