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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

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- 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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