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Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Document Fiscal Year Focus 2016    
Current:      
U.S. Federal $ 0.0 $ 1.9 $ 2.9
State and local 0.1 0.0 0.2
Foreign 10.1 12.7 22.3
Total current tax expense 10.2 14.6 25.4
Deferred:      
U.S. Federal 0.9 (3.3) (10.4)
State and local 0.2 (0.1) (0.1)
Foreign 0.4 (5.1) (2.0)
Total deferred tax expense (benefit) 1.5 (8.5) (12.5)
Total income tax expense $ 11.7 $ 6.1 $ 12.9