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Income Taxes (Schedule of Components of Income Tax Expense (Benefit)) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current:      
Federal $ 1.0 $ (6.5) $ (9.1)
State 3.1 2.1 1.2
Foreign 180.2 170.1 133.5
Current income tax expense (benefit) 184.3 165.7 125.6
Deferred:      
Federal 1.3 1.3 0.0
State 0.0 0.0 0.0
Foreign 2.1 13.8 (14.7)
Deferred income tax expense (benefit) 3.4 15.1 (14.7)
Income tax provision $ 187.7 $ 180.8 $ 110.9