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Nonconsolidated Variable Interest Entities - Schedule of Maximum Exposure to Loss (Details) - Variable Interest Entity, Not Primary Beneficiary - USD ($) $ in Millions	Jun. 30, 2025	Sep. 30, 2024
Variable Interest Entity [Line Items]
Maximum exposure to loss	$ 1,623.8	$ 1,300.4
Investments [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	1,411.5	1,074.4
Receivables [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	$ 212.3	$ 226.0

X

- Definition

The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

+ References

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- Definition

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.

+ References

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