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Income Taxes - Income Tax Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Current:      
Federal $ 5.8 $ 0.0 $ 0.0
State 6.4 3.7 1.3
Foreign 6.6 4.1 4.8
Total current tax expense 18.8 7.8 6.1
Deferred:      
Federal (111.1) 0.1 0.0
State (18.6) 0.0 0.0
Foreign (7.2) 0.4 (0.9)
Total deferred tax (benefit) expense (136.9) 0.5 (0.9)
Income tax (benefit) expense $ (118.1) $ 8.3 $ 5.2