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Retirement Benefits - Schedule of Allocation of Plan Assets (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | $ 2,779.2 | $ 2,457.4 |
Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 73.9 | 67.6 | $ 58.7
U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 1,800.4 | 1,618.8 |
U.S. Plans | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 1,790.4 | 1,607.1 |
U.S. Plans | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 688.0 | 637.8 |
U.S. Plans | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 1,102.4 | 969.3 |
U.S. Plans | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
U.S. Plans | Cash and cash equivalents | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 1.4 | 3.2 |
U.S. Plans | Cash and cash equivalents | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 1.4 | 3.2 |
U.S. Plans | Cash and cash equivalents | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
U.S. Plans | Cash and cash equivalents | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
U.S. Plans | Mutual funds | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets |  | 40.5 |
U.S. Plans | Mutual funds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets |  | 40.5 |
U.S. Plans | Mutual funds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets |  | 0.0 |
U.S. Plans | Mutual funds | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets |  | 0.0 |
U.S. Plans | Preferred and common stock | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 403.2 | 381.8 |
U.S. Plans | Preferred and common stock | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 403.2 | 381.8 |
U.S. Plans | Preferred and common stock | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
U.S. Plans | Preferred and common stock | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
U.S. Plans | Common collective trusts | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 524.4 | 447.4 |
U.S. Plans | Common collective trusts | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
U.S. Plans | Common collective trusts | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 524.4 | 447.4 |
U.S. Plans | Common collective trusts | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
U.S. Plans | Preferred and corporate debt | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 430.6 | 387.2 |
U.S. Plans | Preferred and corporate debt | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
U.S. Plans | Preferred and corporate debt | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 430.6 | 387.2 |
U.S. Plans | Preferred and corporate debt | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
U.S. Plans | Government securities | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 314.8 | 242.5 |
U.S. Plans | Government securities | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 283.4 | 212.3 |
U.S. Plans | Government securities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 31.4 | 30.2 |
U.S. Plans | Government securities | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
U.S. Plans | Common collective trusts | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 116.0 | 104.5 |
U.S. Plans | Common collective trusts | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
U.S. Plans | Common collective trusts | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 116.0 | 104.5 |
U.S. Plans | Common collective trusts | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
U.S. Plans | Private equity and alternative equity | Fair Value Measured at Net Asset Value Per Share |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 10.0 | 11.7 |
Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 978.8 | 838.6 |
Non-U.S. Plans | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 957.8 | 819.9 |
Non-U.S. Plans | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 198.9 | 162.5 |
Non-U.S. Plans | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 685.0 | 589.8 |
Non-U.S. Plans | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 73.9 | 67.6 |
Non-U.S. Plans | Cash and cash equivalents | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 6.3 | 7.0 |
Non-U.S. Plans | Cash and cash equivalents | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 6.3 | 7.0 |
Non-U.S. Plans | Cash and cash equivalents | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
Non-U.S. Plans | Cash and cash equivalents | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
Non-U.S. Plans | Preferred and common stock | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 192.2 | 154.7 |
Non-U.S. Plans | Preferred and common stock | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 192.2 | 154.7 |
Non-U.S. Plans | Preferred and common stock | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
Non-U.S. Plans | Preferred and common stock | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
Non-U.S. Plans | Common collective trusts | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 218.3 | 209.7 |
Non-U.S. Plans | Common collective trusts | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
Non-U.S. Plans | Common collective trusts | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 218.3 | 209.7 |
Non-U.S. Plans | Common collective trusts | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
Non-U.S. Plans | Preferred and corporate debt | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 79.6 | 30.3 |
Non-U.S. Plans | Preferred and corporate debt | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
Non-U.S. Plans | Preferred and corporate debt | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 79.6 | 30.3 |
Non-U.S. Plans | Preferred and corporate debt | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
Non-U.S. Plans | Government securities | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.4 | 0.8 |
Non-U.S. Plans | Government securities | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.4 | 0.8 |
Non-U.S. Plans | Government securities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
Non-U.S. Plans | Government securities | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
Non-U.S. Plans | Common collective trusts | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 333.0 | 294.5 |
Non-U.S. Plans | Common collective trusts | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
Non-U.S. Plans | Common collective trusts | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 333.0 | 294.5 |
Non-U.S. Plans | Common collective trusts | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
Non-U.S. Plans | Real estate funds | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 54.1 | 55.3 |
Non-U.S. Plans | Real estate funds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
Non-U.S. Plans | Real estate funds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 54.1 | 55.3 |
Non-U.S. Plans | Real estate funds | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
Non-U.S. Plans | Real estate funds | Fair Value Measured at Net Asset Value Per Share |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 21.0 | 18.7 |
Non-U.S. Plans | Insurance contracts | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 71.8 | 65.2 |
Non-U.S. Plans | Insurance contracts | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
Non-U.S. Plans | Insurance contracts | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
Non-U.S. Plans | Insurance contracts | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 71.8 | 65.2 | 54.9
Non-U.S. Plans | Other | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 2.1 | 2.4 |
Non-U.S. Plans | Other | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
Non-U.S. Plans | Other | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | 0.0 | 0.0 |
Non-U.S. Plans | Other | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan fair value of plan assets | $ 2.1 | $ 2.4 | $ 3.8

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