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Commitments and Contingencies (Details) - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2025	Sep. 30, 2024
Fund Investment Capital
Commitments and Contingencies [Line Items]
Capital commitments	$ 5.1
Commitment period (in years)	4 years
Standby Letters of Credit
Commitments and Contingencies [Line Items]
Outstanding standby letters of credit	$ 895.2	$ 934.5
Amount available under unsecured credit facilities	376.7
Contingently liable for issuance of standby letters of credit and surety bonds	899.6
Surety Bond
Commitments and Contingencies [Line Items]
Contingently liable for issuance of standby letters of credit and surety bonds	$ 4,900.0

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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