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Retirement Benefits - Schedule of Accumulated and Project Benefit Obligations (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023
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Defined Benefit Plan, Pension Plan with Project Benefit Obligation in Excess of Plan Assets [Abstract] |  |
Projected benefit obligation | $ 2,303.2 | $ 2,082.7
Fair value of plan assets | 1,821.1 | 1,638.9
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Abstract] |  |
Accumulated benefit obligation | 2,136.2 | 1,926.2
Fair value of plan assets | $ 1,808.5 | $ 1,626.7

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