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Employee Benefit Plans - Schedule of Investments Measured at Fair Value Using NAV Per Share (Details) $ in Millions	12 Months Ended
	Sep. 30, 2025 USD ($)
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value at NAV	$ 201.4
Unfunded commitments	1.6
Relative value hedge funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value at NAV	0.1
Unfunded commitments	0.0
Event driven hedge funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value at NAV	0.3
Unfunded commitments	0.0
Common collective trusts, daily redemption
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value at NAV	200.8
Unfunded commitments	$ 0.0
Redemption notice period	3 days
Private equity
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value at NAV	$ 0.2
Unfunded commitments	$ 1.6

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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- Definition

Notice period the entity is required to deliver before it can redeem an investment calculated using net asset value per share, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, investments calculated by per unit, per membership interest, other equity or ownership interest and alternative investments.

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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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