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Retirement Benefits - Schedule of Components of Net Periodic Benefit Cost (Income) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Amortization [Abstract] |  |  |
Amortization of net actuarial loss (gain) | $ (29.0) |  |
Pension Benefits |  |  |
Components of net periodic benefit cost |  |  |
Service cost | $ 41.0 | $ 37.0 | $ 42.0
Interest cost | Other Income (Expense) | Other Income (Expense) | Other Income (Expense)
Interest cost | $ 136.0 | $ 147.0 | $ 150.0
Expected return on plan assets | Other Income (Expense) | Other Income (Expense) | Other Income (Expense)
Expected return on plan assets | $ (167.0) | $ (170.0) | $ (191.0)
Amortization [Abstract] |  |  |
Amortization of net actuarial loss (gain) | $ 27.0 | $ (1.0) | $ (2.0)
Settlement and curtailment charges | Other Income (Expense) | Other Income (Expense) | Other Income (Expense)
Settlement and curtailment charges | $ 1.0 | $ 0.0 | $ 123.0
Net periodic benefit cost | 38.0 | 13.0 | 122.0
Other Postretirement Benefits |  |  |
Components of net periodic benefit cost |  |  |
Service cost | $ 1.0 | $ 1.0 | $ 1.0
Interest cost | Other Income (Expense) | Other Income (Expense) | Other Income (Expense)
Interest cost | $ 2.0 | $ 3.0 | $ 3.0
Expected return on plan assets | Other Income (Expense) | Other Income (Expense) | Other Income (Expense)
Expected return on plan assets | $ 0.0 | $ 0.0 | $ 0.0
Amortization [Abstract] |  |  |
Amortization of net actuarial loss (gain) | $ 2.0 | $ 1.0 | $ 0.0
Settlement and curtailment charges | Other Income (Expense) | Other Income (Expense) | Other Income (Expense)
Settlement and curtailment charges | $ 0.0 | $ 0.0 | $ 0.0
Net periodic benefit cost | $ 5.0 | $ 5.0 | $ 4.0

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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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