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Employee Benefit Plans - Schedule of Amortization of Prior Service Cost (Credit) Recognized in AOCI (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Pension benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amortization of prior service credits (costs) recognized in Accumulated other comprehensive income | $ (0.1) | $ (0.1) | $ (0.1)
Net periodic benefit costs (income) | 24.4 | 10.0 | (20.0)
Total pre-tax amount recognized in Comprehensive income | 24.3 | 9.9 | (20.1)
Other postretirement benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amortization of prior service credits (costs) recognized in Accumulated other comprehensive income | 2.2 | 2.2 | 2.2
Net periodic benefit costs (income) | (0.8) | 1.7 | (7.6)
Total pre-tax amount recognized in Comprehensive income | $ 1.4 | $ 3.9 | $ (5.4)

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