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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Statement of Comprehensive Income [Abstract] |  |  |  |
Pension and other postretirement benefit plan adjustments tax (expense) benefit | $ (2.0) | $ 0.0 | $ (5.0) | $ 0.0
Net change in unrealized gains and losses on cash flow hedges tax (expense) benefit | $ 6.0 | $ 0.0 | $ 0.0 | $ 5.0

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- Definition Amount, after reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness, attributable to parent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-12 + Details
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