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Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk - Schedule of Income Statement Effects of Derivative Instruments (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Designated as Hedging Instrument        
Derivative Instruments and Hedging Activities Disclosure [Line Items]        
Total derivatives designated as hedging instruments $ 6.1 $ (2.6) $ 9.1 $ (19.4)
Amount of gain reclassified from accumulated other comprehensive income into income as a result of a forecasted transaction that is no longer probable of occurring 0.0 0.0 0.0 0.0
Interest rate contracts        
Derivative Instruments and Hedging Activities Disclosure [Line Items]        
Total derivatives designated as hedging instruments 33.5 27.1 83.4 70.0
Interest rate contracts | Designated as Hedging Instrument        
Derivative Instruments and Hedging Activities Disclosure [Line Items]        
Total derivatives designated as hedging instruments 0.0 (4.4) (0.2) (24.9)
Foreign currency forward contracts | Designated as Hedging Instrument        
Derivative Instruments and Hedging Activities Disclosure [Line Items]        
Total derivatives designated as hedging instruments $ 6.1 $ 1.8 $ 9.3 $ 5.5