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Income Taxes - Significant Components of Income Tax Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Current:      
U.S. federal current expense (benefit) $ 0.0 $ 0.0 $ 0.0
State current expense (benefit) 0.0 0.0 (0.1)
Foreign current expense 0.1 4.0 0.1
Total current expense (benefit) 0.1 4.0 0.0
Deferred:      
U.S. federal deferred benefit (0.2) (1.2) (2.2)
State deferred benefit 0.0 0.0 (0.2)
Foreign deferred tax benefit (30.5) (5.9) (6.0)
Total deferred benefit (30.7) (7.1) (8.4)
Total income tax benefit $ (30.6) $ (3.1) $ (8.4)