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Income Taxes - Significant Components of Income Tax Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Current:      
U.S. federal current expense (benefit) $ 0.0 $ 0.0 $ 0.0
State current expense (benefit) 0.2 0.0 0.0
Foreign current expense (benefit) 4.0 0.1 4.0
Total current expense (benefit) 4.2 0.1 4.0
Deferred:      
U.S. federal deferred (benefit) (0.3) (0.2) (1.2)
State deferred benefit 0.0 0.0 0.0
Foreign deferred tax expense (benefit) 43.5 (30.5) (5.9)
Total deferred expense (benefit) 43.2 (30.7) (7.1)
Total income tax expense (benefit) $ 47.4 $ (30.6) $ (3.1)