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Debt - Other Debt and Other Items (Details) - Other Debt - USD ($) $ in Millions	Jun. 30, 2024	Sep. 30, 2023
Unsecured
Debt
Current borrowing capacity	$ 407.1
Standby Letters of Credit
Debt
Outstanding letters of credit	$ 909.4	$ 878.9

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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