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Commitments and Contingencies - Commitments (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Standby letters of credit    
Commitments and Contingencies    
Outstanding standby letters of credit $ 934.5 $ 878.9
Amount available under letters of credit 389.8  
Contingency liability 938.9  
Surety Bond    
Commitments and Contingencies    
Contingency liability 5,100.0  
Fund investment capital    
Commitments and Contingencies    
Commitment $ 5.9  
Commitment period 4 years