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Income Taxes - Income Tax Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Current tax expense (benefit):      
Federal $ 1,200.9 $ 1,293.0 $ 1,448.9
State 258.8 272.4 256.1
Total current tax expense (benefit) 1,459.7 1,565.4 1,705.0
Deferred tax expense:      
Federal 15.5 (39.0) 21.2
State 3.5 (6.9) 7.9
Total deferred tax expense (benefit) 19.0 (45.9) 29.1
Total income tax expense (benefit) $ 1,478.7 $ 1,519.5 $ 1,734.1