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Income Taxes (Schedule of Components of Income Tax Expense (Benefit)) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current:      
Federal $ (24.3) $ (1.3) $ 12.6
State 0.2 2.8 2.8
Foreign 114.2 97.8 168.7
Current income tax expense (benefit) 90.1 99.3 184.1
Deferred:      
Federal 21.9 (19.0) (0.4)
State 0.0 0.0 0.0
Foreign (19.8) (7.8) 4.0
Deferred income tax expense (benefit) 2.1 (26.8) 3.6
Income tax provision $ 92.2 $ 72.5 $ 187.7