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

12 Months Ended

Sep. 30, 2025

Sep. 30, 2024

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

Unfunded commitments

$ 13.3

$ 14.0

Nonredeemable Investments with known liquidation periods

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

Alternative Investment

^[1]

$ 19.7

$ 32.4

Liquidation weighted-average period

2 years 2 months 12 days

1 year 10 months 24 days

Nonredeemable Investments With Unknown Liquidation Periods

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

Alternative Investment

^[1]

$ 15.2

$ 16.1

Redeemable Investments [Member]

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

Alternative Investment

^[2]

$ 64.0

$ 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 2.2 years and 1.9 years at September 30, 2025 and 2024.
[2]	Investments are redeemable on a semi-monthly, monthly and quarterly basis.

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