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Business Segment Information (Reconciliation of Equity Affiliates' 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] |  |  |  |
Equity affiliates' income | $ 167.6 | $ 168.9 | $ 463.7 | $ 470.6
Segment Total |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Equity affiliates' income | $ 167.6 | $ 168.9 | 470.5 | $ 470.6
Segment Reconciling Items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Equity method investment impairment associated with business and asset actions |  |  | $ (6.8) |

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