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Income Taxes - Significant Components of Income Tax Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Current:      
U.S. federal current expense (benefit) $ 0.0 $ 0.5 $ 0.0
State current expense (benefit) 0.0 0.0 0.2
Foreign current expense (benefit) 4.9 15.8 4.0
Total current expense (benefit) 4.9 16.3 4.2
Deferred:      
U.S. federal deferred benefit 0.0 (0.3) (0.3)
State deferred benefit 0.0 (0.1) 0.0
Foreign deferred tax (benefit) expense (1.7) (30.5) 43.5
Total deferred (benefit) expense (1.7) (30.9) 43.2
Total income tax (benefit) expense $ 3.2 $ (14.6) $ 47.4