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Other Expenses (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Other Expenses [Abstract]        
Non-income taxes $ 3.5 $ 2.6 $ 8.8 $ 7.9
Insurance 2.8 2.8 9.0 8.9
Employee related expenses 1.6 1.8 5.2 5.4
Other direct business expenses 4.6 3.8 12.5 11.7
Membership fees 0.9 0.9 2.8 2.8
Director and public company expenses 1.0 0.6 2.2 1.8
Office expenses 0.7 0.6 2.0 1.7
Other expenses 0.0 5.0 4.1 10.1
Total other expenses $ 15.1 $ 18.1 $ 46.6 $ 50.3