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Income Taxes - Income Tax Provision (Benefit) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Current:      
U.S. federal $ (0.1) $ (0.2) $ (0.5)
Non-U.S.  225.9 42.9 30.8
State 0.1 0.1 0.0
Total current 225.9 42.8 30.3
Deferred:      
Non-U.S.  82.9 (81.6) (7.5)
Total deferred 82.9 (81.6) (7.5)
Total income tax provision (benefit) $ 308.8 $ (38.8) $ 22.8