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v3.26.1

Employee Benefit Plans (Tables) | 6 Months Ended
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Mar. 31, 2026
Retirement Benefits [Abstract] |
Components of Pension and Other Postretirement Benefit Income | The following table summarizes the components of Net pension and other postretirement plan income within the Condensed Consolidated Statements of Comprehensive Income:
|  | Pension benefits |  | Other postretirement benefits
(In millions) |  | 2026 |  | 2025 |  | 2026 |  | 2025
Three months ended March 31 |  |  |  |  |  |  |  |
Interest cost |  | $ | 17.0 |  |  | $ | 17.5 |  |  | $ | 0.2 |  |  | $ | 0.2 |
Expected return on plan assets |  | (17.9) |  |  | (18.1) |  |  | — |  |  | — |
Amortization of prior service credits |  | — |  |  | — |  |  | (0.5) |  |  | (0.5) |
Net periodic benefit income |  | $ | (0.9) |  |  | $ | (0.6) |  |  | $ | (0.3) |  |  | $ | (0.3) |
Six months ended March 31 |  |  |  |  |  |  |  |
Interest cost |  | $ | 33.9 |  |  | $ | 34.9 |  |  | $ | 0.5 |  |  | $ | 0.5 |
Expected return on plan assets |  | (35.7) |  |  | (36.1) |  |  | — |  |  | — |
Amortization of prior service credits |  | — |  |  | — |  |  | (1.1) |  |  | (1.1) |
Net periodic benefit income |  | $ | (1.8) |  |  | $ | (1.2) |  |  | $ | (0.6) |  |  | $ | (0.6) |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (q) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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