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Consolidated Statement of Comprehensive Income (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Other comprehensive income |  |  |
Pension and other postretirement (benefit) expense tax | $ 31.0 | $ 7.0 | $ (15.0)
Net change in cash flow hedges, tax benefit (expense) | $ (2.0) | $ 11.0 | $ 5.0

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