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Income Taxes - Components of Provision for Income Tax Expense (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Current:                      
Federal                 $ 58.7 $ 63.7 $ 29.8
State and other                 13.5 20.8 10.4
Total current expense                 72.2 84.5 40.2
Deferred:                      
Federal                 17.9 14.4 23.0
State and other                 10.0 3.0 11.5
Total deferred expense                 27.9 17.4 34.5
Total income tax expense related to continuing operations $ 31.9 $ 21.8 $ 22.8 $ 23.6 $ 22.5 $ 26.2 $ 28.2 $ 25.0 $ 100.1 $ 101.9 $ 74.7