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Income Taxes - Significant Components of Income Tax Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current:      
U.S. federal current expense (benefit) $ 0.0 $ (0.1) $ (0.2)
State current expense (benefit) (1.1) 1.2 (0.1)
Foreign current expense 0.8 12.3 5.7
Total current expense (benefit) (0.3) 13.4 5.4
Deferred:      
U.S. federal deferred benefit (1.6) (2.5) (1.6)
State deferred benefit 0.0 0.0 0.0
Foreign deferred tax expense (benefit) 1.7 (3.3) (1.0)
Total deferred expense (benefit) 0.1 (5.8) (2.6)
Total income tax expense (benefit) $ (0.2) $ 7.6 [1] $ 2.8
[1] As adjusted due to the adoption of ASU 2017-07 Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost