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Business Segment Information (Reconciliation of Operating Income) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Segment Reporting Information [Line Items] |  |  |  |
Operating income (loss) | $ 790.6 | $ 737.6 | $ (893.8) | $ 2,041.7
Business and asset actions | (24.1) | 0.0 | (2,952.0) | (57.0)
Shareholder activism costs | (25.0) | 0.0 | (86.3) | 0.0
Gain on sale of business | 67.3 | 0.0 | 67.3 | 0.0
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income (loss) | 741.1 | 737.6 | 2,045.9 | 2,098.7
Segment Reconciling Items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Business and asset actions | (24.1) | 0.0 | (2,952.0) | (57.0)
Shareholder activism costs | (25.0) | 0.0 | (86.3) | 0.0
Gain on sale of business | 67.3 | 0.0 | 67.3 | 0.0
Gain on sale of other assets | $ 31.3 | $ 0.0 | $ 31.3 | $ 0.0

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