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Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk - Schedule of Accumulated Other Comprehensive Income Effects of Derivative Instruments Designated for Hedging Held (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Amount of Gain/(Loss) Recognized in Other Comprehensive Income on Derivatives, net of tax $ (0.6) $ 25.7
Interest rate contracts    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Amount of Gain/(Loss) Recognized in Other Comprehensive Income on Derivatives, net of tax 0.1 18.5
Foreign currency forwards    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Amount of Gain/(Loss) Recognized in Other Comprehensive Income on Derivatives, net of tax $ (0.7) $ 7.2