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Income Taxes - Schedule of Income Tax Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Current      
Federal $ 24.5 $ 34.7 $ 8.0
State 11.7 8.3 (5.5)
Non-U.S. 3.0 2.6 1.0
Current income tax expense 39.2 45.6 3.5
Deferred      
Federal 31.5 20.8 36.8
State 5.8 2.7 (3.2)
Non-U.S. 1.0 0.0 0.0
Deferred income tax expense 38.3 23.5 33.6
Income tax expense $ 77.5 $ 69.1 $ 37.1