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Supplemental Information (Shareholder Activism Costs) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Shareholder Activism Costs [Line Items] |  |  |  |
Legal, executive separation, and other professional service fees in connection with response to proxy contest | $ 25.0 | $ 0.0 | $ 86.3 | $ 0.0
Legal, executive separation, and other professional service fees in connection with response to proxy contest, after tax | 18.8 |  | 71.7 |
Amount of related party transaction (sales to and other income) | (90.0) | (240.0) | (80.0) | (255.0)
Severance and other cash benefits | 24.1 | $ 0.0 | 2,952.0 | $ 57.0
Mantle Ridge LP and Affiliates Transaction | Affiliated Entity |  |  |  |
Shareholder Activism Costs [Line Items] |  |  |  |
Amount of related party transaction (sales to and other income) | 24.7 |  |  |
Executive Separation Costs |  |  |  |
Shareholder Activism Costs [Line Items] |  |  |  |
Share-based payment arrangement, accelerated cost |  |  | $ 22.4 |
Severance and other cash benefits | $ 7.3 |  |  |

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