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Income Taxes - Components of Pre-tax Book Income (Loss) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Tax Disclosure [Abstract]      
U.S. $ 78.0 $ (193.6) $ (250.5)
Foreign  (144.8) 227.0 52.9
(Loss) income before income taxes $ (66.8) $ 33.4 $ (197.6)