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Pension Benefit Obligations - Schedule of Additional Year-End Information for Pension Plans With Accumulated Benefit Obligations In Excess of Plan Assets (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | --- | ---
U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected benefit obligation | $ 165.8 | $ 175.1 | $ 168.8
Accumulated benefit obligation | 165.8 | 175.1 | 168.8
Fair value of plan assets | 104.9 | 109.0 | 98.8
Int’l |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected benefit obligation | 395.6 | 649.8 | 628.1
Accumulated benefit obligation | 395.6 | 649.8 | 628.1
Fair value of plan assets | $ 325.9 | $ 547.1 | $ 506.5

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