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Employee Benefit Plans - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items]
Actuarial gain (loss)	$ (26.6)	$ 2.4	$ 41.6
Contribution plan expense	$ 15.2	14.1	12.5
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Target asset allocations	90.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target asset allocations	10.00%
Pension benefits
Defined Benefit Plan Disclosure [Line Items]
Actuarial gain (loss)	$ 11.9	(140.0)
Accumulated benefit obligations	$ 1,494.3	$ 1,565.7	$ 1,478.1

X

- Definition

Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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Amount of cost for defined contribution plan.

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