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Other Expenses (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Other Expenses [Abstract]      
Non-income taxes $ 12.8 $ 16.8 $ 13.5
Insurance 11.8 11.1 10.8
Employee related expenses 7.3 10.1 9.6
Other direct business expenses 15.1 14.8 10.0
Membership fees 3.7 3.4 3.3
Director and public company expenses 2.1 2.3 1.8
Office expenses 2.4 1.9 1.7
Other expenses 9.9 6.0 9.9
Total other expenses $ 65.1 $ 66.4 $ 60.6