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Income Taxes (Schedule of Components of Income Tax Expense (Benefit)) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Current:      
Federal $ (6.5) $ (9.1) $ 20.3
State 2.1 1.2 0.6
Foreign 170.1 133.5 126.8
Current income tax expense (benefit) 165.7 125.6 147.7
Deferred:      
Federal 1.3 0.0 0.9
State 0.0 0.0 0.0
Foreign 13.8 (14.7) (15.0)
Deferred income tax expense (benefit) 15.1 (14.7) (14.1)
Income tax provision $ 180.8 $ 110.9 $ 133.6