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Income Taxes - Components of Provision for Income Tax Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Current:      
Federal $ 101.7 $ 58.7 $ 63.7
State and other 26.6 13.5 20.8
Total current expense 128.3 72.2 84.5
Deferred:      
Federal (0.7) 17.9 14.4
State and other 4.6 10.0 3.0
Total deferred expense 3.9 27.9 17.4
Total income tax expense related to continuing operations $ 132.2 $ 100.1 $ 101.9