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Debt - Other Debt and Other Items (Details) - Other Debt - Standby Letters of Credit - Unsecured - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Debt
Outstanding letters of credit	$ 878.9	$ 640.3
Current borrowing capacity	$ 416.7

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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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