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v3.25.3

Dispositions (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2025 | Oct. 17, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds from Divestiture of Businesses, Net of Cash Divested |  |  |  | $ 58.1 | $ 0.0 |  |
Impairment charges |  | $ 0.0 | $ 12.0 | 8.0 | 12.0 |  |
Proceeds from disposition of affiliates |  |  |  | 30.1 | 0.0 |  |
AAM India Manufacturing Corporation Pvt., Ltd. |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  |  |  |  |  |  | $ 65.0
Proceeds from Divestiture of Businesses, Net of Cash Divested |  | $ 58.1 |  |  |  |  |
Impairment charges |  |  |  | 8.0 | $ 12.0 |  |
AAM India Manufacturing Corporation Pvt., Ltd. | Subsequent Event |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds from Divestiture of Businesses, Net of Cash Divested | $ 6.3 |  |  |  |  | $ 64.4 |
Hefei AAM Automotive Driveline & Chassis System Co., Ltd. and Liuzhou AAM Automotive Driveline System Co., Ltd. |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds from disposition of affiliates |  |  |  | $ 30.1 |  |  |

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