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Income Taxes - Components of the Provision for (Benefit from) Income Taxes for Continuing Operations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Current:      
Federal $ 17.1 $ 0.0 $ 0.0
State 20.3 6.3 10.1
Total current taxes 37.4 6.3 10.1
Deferred:      
Federal 27.5 5.9 (287.5)
State (5.5) (0.4) (23.2)
Total deferred taxes 22.0 5.5 (310.7)
Provision for (benefit from) income taxes $ 59.4 $ 11.8 $ (300.6)