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Retirement Benefits - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expense related to defined contribution savings plans | $ 91,700,000 | $ 76,900,000 | $ 63,800,000
Defined benefit plan, percentage of benefit obligation relating to domestic plan | 70.00% |  |
Recognized prior service credits | $ (100,000) |  |
Recognized prior service credits, net of tax | 0.0 |  |
Recognized net actuarial losses | (500,000) |  |
Recognized net actuarial losses, net of tax | (400,000) |  |
Defined benefit plan, net periodic benefit cost (credit) excluding service cost, statement of income or comprehensive income [extensible enumeration] |  | Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest |
Defined benefit plan, accumulated benefit obligation | 2,895,000,000 | $ 2,584,600,000 |
U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Voluntary contribution to U.S. qualified pension plan | 0 | 0 | 0
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Voluntary contribution to U.S. qualified pension plan | 27,300,000 | 26,600,000 |
Recognized prior service credits | 0 | 100,000 | 600,000
Recognized net actuarial losses | (1,100,000) | $ (2,600,000) | 59,400,000
Estimated future payments, during next fiscal year | $ 19,000,000.0 |  |
Pension Benefits | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 5.10% | 6.10% |
Pension Benefits | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 3.87% | 4.65% |
Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Voluntary contribution to U.S. qualified pension plan | $ 8,800,000 | $ 9,100,000 |
Recognized prior service credits | 0 | 0 | (800,000)
Recognized net actuarial losses | 1,600,000 | $ 500,000 | $ 700,000
Estimated future payments, during next fiscal year | $ 6,700,000 |  |
Other Postretirement Benefits | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 4.91% | 6.20% |
Other Postretirement Benefits | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 4.45% | 5.75% |
Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Company contribution to defined contribution plan (percentage) | 3.00% |  |
Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Company contribution to defined contribution plan (percentage) | 7.00% |  |

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