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Discontinued Operations - Narrative (Details) - USD ($) $ in Millions |  | 12 Months Ended
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Mar. 01, 2023 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Proceeds from sale of operations, net of cash disposed |  | $ 121.0 | $ 71.5 | $ 0.0
Discontinued Operations, Held-for-sale |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Gain (loss) on disposal of discontinued operations |  | $ 0.0 | $ 0.0 | $ 1,571.6
Discontinued Operations, Held-for-sale | Global Products |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Proceeds from sale of operations, net of cash disposed | $ 2,650.0 |  |  |

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