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Income Taxes (Components of Income Tax Expense (Benefit)) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Federal:      
Current $ 4.8 $ 1.4 $ 32.0
Deferred (7.3) (5.5) (20.0)
State:      
Current (2.1) 2.7 3.9
Deferred 0.4 (0.5) (5.3)
Foreign:      
Current 2.0 2.4 3.7
Deferred (7.6) (16.5) (1.3)
Total income tax (benefit) expense $ (9.8) $ (16.0) $ 13.0