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Income Taxes - Income Tax Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Current tax expense (benefit):      
Federal $ 1,448.9 $ 978.1 $ 484.0
State 256.1 197.0 104.4
Total current tax expense (benefit) 1,705.0 1,175.1 588.4
Deferred tax expense:      
Federal 21.2 (12.7) 20.0
State 7.9 2.7 (5.9)
Total deferred tax expense (benefit) 29.1 (10.0) 14.1
Total income tax expense (benefit) $ 1,734.1 $ 1,165.1 $ 602.5