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Employee Benefit Plans | 9 Months Ended
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Jun. 30, 2026
Retirement Benefits [Abstract] |
Employee Benefit Plans | EMPLOYEE BENEFIT PLANS 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 June 30 |  |  |  |  |  |  |  |
Interest cost |  | $ | 16.9 |  |  | $ | 17.4 |  |  | $ | 0.3 |  |  | $ | 0.3 |
Expected return on plan assets |  | (17.9) |  |  | (18.1) |  |  | — |  |  | — |
Amortization of prior service (credits) costs |  | — |  |  | 0.1 |  |  | (0.6) |  |  | (0.6) |
Net periodic benefit income |  | $ | (1.0) |  |  | $ | (0.6) |  |  | $ | (0.3) |  |  | $ | (0.3) |
Nine months ended June 30 |  |  |  |  |  |  |  |
Interest cost |  | $ | 50.8 |  |  | $ | 52.3 |  |  | $ | 0.8 |  |  | $ | 0.8 |
Expected return on plan assets |  | (53.6) |  |  | (54.2) |  |  | — |  |  | — |
Amortization of prior service (credits) costs |  | — |  |  | 0.1 |  |  | (1.7) |  |  | (1.7) |
Net periodic benefit income |  | $ | (2.8) |  |  | $ | (1.8) |  |  | $ | (0.9) |  |  | $ | (0.9) |

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- Definition The entire disclosure for an entity's employee compensation and benefit plans, including, but not limited to, postemployment and postretirement benefit plans, defined benefit pension plans, defined contribution plans, non-qualified and supplemental benefit plans, deferred compensation, share-based compensation, life insurance, severance, health care, unemployment and other benefit plans. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/715/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 712 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/712/tableOfContent Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 710 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/710/tableOfContent Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/718/tableOfContent + Details
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