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Income Taxes - Income Tax Provision (Benefit) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Current:      
U.S. federal $ (0.1) $ (0.1) $ (0.2)
Non-U.S.  96.7 225.9 42.9
State 0.0 0.1 0.1
Total current 96.6 225.9 42.8
Deferred:      
Non-U.S.  12.2 82.9 (81.6)
Total deferred 12.2 82.9 (81.6)
Total income tax provision (benefit) $ 108.8 $ 308.8 $ (38.8)