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Commitments and Contingencies - Commitments (Details) - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2024	Sep. 30, 2023
Standby letters of credit
Commitments and Contingencies
Outstanding standby letters of credit	$ 909.4	$ 878.9
Amount available	407.1
Contingency liability	913.8
Surety Bond
Commitments and Contingencies
Contingency liability	5,300.0
Fund investment capital
Commitments and Contingencies
Commitment	$ 6.3
Commitment period	4 years

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- Definition

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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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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No definition available.

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Period covered by the long-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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