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Other Expenses (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Other Expenses [Abstract]      
Non-income taxes $ 13.3 $ 12.8 $ 16.8
Insurance 12.1 11.8 11.1
Employee related expenses 7.3 7.3 10.1
Other direct business expenses 17.7 15.1 14.8
Membership fees 3.9 3.7 3.4
Director and public company expenses 2.7 2.1 2.3
Office expenses 3.0 2.4 1.9
Other expenses 6.0 9.9 6.0
Total other expenses $ 66.0 $ 65.1 $ 66.4