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Income Taxes - Components of Income Tax Expense (Benefit), Continuing Operations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current income taxes:      
U.S. federal $ 14.3 $ 13.0 $ 6.6
U.S. state 0.1 1.1 0.6
Foreign 17.2 14.2 10.0
Current income taxes 31.6 28.3 17.2
Deferred income taxes:      
U.S. federal (2.7) (5.8) 3.0
U.S. state (4.0) 0.1 (0.8)
Foreign (9.5) (1.0) 1.1
Deferred income taxes (16.2) (6.7) 3.3
Provision for income taxes $ 15.4 $ 21.6 $ 20.5