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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, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current:                      
Federal                 $ 37.7 $ 58.1 $ 103.8
State and other                 13.7 17.8 24.2
Total current expense                 51.4 75.9 128.0
Deferred:                      
Federal                 39.5 32.0 (13.7)
State and other                 12.9 8.0 4.6
Total deferred expense (benefit)                 52.4 40.0 (9.1)
Total income tax expense related to continuing operations $ 38.0 $ 26.9 $ 11.8 $ 27.1 $ 27.3 $ 34.3 $ 23.5 $ 30.8 $ 103.8 $ 115.9 $ 118.9