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Supplemental Information (Related Party Transactions) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Sep. 30, 2024
Related Party Transaction [Line Items] |  |  |  |  |
Amount of related party transaction (sales to and other income) | $ (90.0) | $ (240.0) | $ (80.0) | $ (255.0) |
Trade receivables, net | 1,943.5 |  | 1,943.5 |  | $ 1,821.6
Current portion of long-term debt | 699.0 |  | 699.0 |  | 611.4
Short-term borrowings | 536.2 |  | 536.2 |  | 83.5
Related Party |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Trade receivables, net | 190.0 |  | 190.0 |  | 120.0
Related Party | Lu-An Clean Energy Company Transaction |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Total debt | 298.2 |  | 298.2 |  | 304.4
Current portion of long-term debt | 54.7 |  | 54.7 |  | $ 200.0
Short-term borrowings | 196.0 |  | $ 196.0 |  |
Affiliated Entity | Mantle Ridge LP and Affiliates Transaction |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Amount of related party transaction (sales to and other income) | $ 24.7 |  |  |  |

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