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Income Taxes - Income Before the Provision for Income Taxes from Continuing Domestic and Foreign Operations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Tax Disclosure [Abstract]      
U.S. $ 409.2 $ 218.0 $ 101.4
Foreign (77.1) (4.1) 0.0
Income before provision for income taxes $ 332.1 $ 213.9 $ 101.4