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Income Taxes - Components of Income Tax (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Current expense      
Federal and other $ (3.2) $ 0.2 $ 1.8
Foreign 24.4 28.6 25.0
Total current income tax expense 21.2 28.8 26.8
Deferred expense (benefit)      
Federal and other (7.0) (16.7) 6.8
Foreign 0.1 (3.4) (5.5)
Total deferred income tax (benefit) expense (6.9) (20.1) 1.3
Total income tax expense $ 14.3 $ 8.7 $ 28.1