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Income Taxes - Difference in Income Tax Expense and Expected Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Amount      
U.S. federal statutory income tax $ 319.6 $ 302.4 $ 253.6
State income taxes, net of federal benefit 45.1 45.6 34.9
Other, net 2.3 5.1 (5.7)
Effective income tax rate $ 367.0 $ 353.1 $ 282.8
Percent      
U.S. federal statutory income tax, percent 21.00% 21.00% 21.00%
State income taxes, net of federal benefit, percent 3.00% 3.20% 2.90%
Other, net, percent 0.10% 0.30% (0.50%)
Effective income tax rate 24.10% 24.50% 23.40%