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Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Current:      
U.S. Federal $ 1.9 $ 0.3 $ 0.0
State and local 0.0 0.2 0.1
Foreign 8.7 30.2 25.6
Total current tax expense 10.6 30.7 25.7
Deferred:      
U.S. Federal (3.3) (10.3) 0.5
State and local (0.1) (0.1) 0.0
Foreign (22.3) 11.6 (30.5)
Total deferred tax expense (benefit) (25.7) 1.2 (30.0)
Total income tax expense (benefit) $ (15.1) $ 31.9 $ (4.3)