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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 (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Amount of Gain/(Loss) Recognized in Other Comprehensive Income on Derivatives, net of tax	$ 6.3	$ 1.3	$ 6.0	$ 21.2
Interest rate contracts
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Amount of Gain/(Loss) Recognized in Other Comprehensive Income on Derivatives, net of tax	0.0	2.8	0.1	17.1
Foreign currency forward contracts
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Amount of Gain/(Loss) Recognized in Other Comprehensive Income on Derivatives, net of tax	$ 6.3	$ (1.5)	$ 5.9	$ 4.1

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