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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
Income Tax Disclosure [Abstract]      
Document Fiscal Year Focus 2018    
Current:      
U.S. Federal $ (25.0) $ 28.9 $ 0.0
State and local 0.1 0.1 0.1
Foreign 11.6 11.7 6.8
Total current tax expense (13.3) 40.7 6.9
Deferred:      
U.S. Federal 7.8 (26.8) 0.8
State and local 0.2 0.0 0.2
Foreign 0.8 (1.0) 0.4
Total deferred tax (benefit) expense 8.8 (27.8) 1.4
Total income tax expense $ (4.5) $ 12.9 $ 8.3