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Fair Value Measurements - Schedule of investments measured at NAV (Details) - USD ($)
$ in Millions

6 Months Ended

12 Months Ended

Mar. 31, 2025

Sep. 30, 2024

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Unfunded commitments

$ 11.0

$ 14.0

Nonredeemable investments with unknown liquidation periods

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Alternative Investment

^[1]

15.4

16.1

Nonredeemable investments with known liquidation periods

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Alternative Investment

^[1]

$ 25.8

$ 32.4

Liquidation weighted-average period

2 years 1 month 6 days

1 year 10 months 24 days

Redeemable Investments [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Alternative Investment

^[2]

$ 58.5

$ 60.3

[1]	The investments are expected to be returned through distributions over the life of the funds as a result of liquidations of the funds’ underlying assets. Investments with known liquidation periods have an expected weighted-average life of 2.1 years and 1.9 years at March 31, 2025 and September 30, 2024.
[2]	Investments are redeemable on a semi-monthly, monthly and quarterly basis.

X

- Definition

Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund.

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Remaining period of expected liquidation by investee of underlying asset of investment measured at net asset value per share or unit. In 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments).

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