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Income Taxes - Difference in Income Tax Expense and Expected Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Amount      
United States federal statutory income tax $ 316.7 $ 319.6 $ 302.4
State income taxes, net of federal benefit 43.3 45.1 45.6
Other, net (2.5) 2.3 5.1
Effective income tax rate $ 357.5 $ 367.0 $ 353.1
Percent      
United States federal statutory income tax, percent 21.00% 21.00% 21.00%
State income taxes, net of federal benefit, percent 2.90% 3.00% 3.20%
Other, net, percent (0.20%) 0.10% 0.30%
Effective income tax rate 23.70% 24.10% 24.50%