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Income Taxes (Schedule of Components of Income Tax Expense (Benefit)) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current:      
Federal $ (9.1) $ 20.3 $ (24.3)
State 1.2 0.6 0.2
Foreign 133.5 126.8 114.2
Current income tax expense (benefit) 125.6 147.7 90.1
Deferred:      
Federal 0.0 0.9 21.9
State 0.0 0.0 0.0
Foreign (14.7) (15.0) (19.8)
Deferred income tax expense (benefit) (14.7) (14.1) 2.1
Income tax provision $ 110.9 $ 133.6 $ 92.2