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Income Taxes - Components of the Provision for Income Taxes for Continuing Operations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Current:      
Federal $ 115.0 $ 17.1 $ 0.0
State 28.1 20.3 6.3
Current income taxes 143.1 37.4 6.3
Deferred:      
Federal (45.2) 27.5 5.9
State (15.5) (5.5) (0.4)
Deferred income taxes (60.7) 22.0 5.5
Provision for income taxes $ 82.4 $ 59.4 $ 11.8