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Accumulated Other Comprehensive Income (Loss) - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Equity [Abstract] |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax | $ 11.6 |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax | (2.8) |  |
Foreign currency translation | 9.1 | $ (11.9) | $ (25.5)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax | $ 0.0 |  |

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