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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2025 | Sep. 30, 2024
Income Tax Disclosure [Abstract] |  |  |
Income Tax Benefit | $ 29.0 |  |
Prepaid taxes |  | $ 22.3 | $ 25.1
Deferred income taxes and tax credits | $ 25.7 |  |

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