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Debt - Other Debt and Other Items (Details) - USD ($) $ in Millions	Jun. 30, 2023	Sep. 30, 2022
Debt
Outstanding letters of credit	$ 883.3	$ 640.3
Current borrowing capacity	415.9
Unsecured
Debt
Current borrowing capacity	$ 415.9

X

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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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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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No definition available.

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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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