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Goodwill and Identifiable Intangible Assets (Estimated Amortization Expense) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization of intangibles $ 11.6 $ 7.8 $ 23.6 $ 16.2
Estimated amortization expense, 2021 [1] 46.3   46.3  
Estimated amortization expense, 2022 [1] 42.6   42.6  
Estimated amortization expense, 2023 [1] 40.2   40.2  
Estimated amortization expense, 2024 [1] 38.5   38.5  
Estimated amortization expense, 2025 [1] 36.8   36.8  
Estimated amortization expense, 2026 [1] $ 34.5   $ 34.5  
[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.