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Goodwill and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill [Table Text Block] | The following table provides a reconciliation of changes in goodwill for the nine months ended September 30, 2025:
|  |  |  |  | Consolidated
|  |  |  |  | (in millions)
Balance at December 31, 2024 |  |  |  |  | $ | 172.0 |
Foreign currency translation |  |  |  |  | 2.5 |
Balance at September 30, 2025 |  |  |  |  | $ | 174.5 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] | The following table provides a reconciliation of the gross carrying amount and associated accumulated amortization for AAM's other intangible assets, which are all subject to amortization:
| September 30, |  | December 31,
| 2025 |  | 2024
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
| (in millions)
Capitalized computer software | $ | 61.1 |  |  | $ | (55.0) |  |  | $ | 6.1 |  |  | $ | 60.9 |  |  | $ | (52.6) |  |  | $ | 8.3 |
Customer platforms | 856.2 |  |  | (539.1) |  |  | 317.1 |  |  | 856.2 |  |  | (491.6) |  |  | 364.6 |
Customer relationships | 53.0 |  |  | (29.1) |  |  | 23.9 |  |  | 53.0 |  |  | (26.5) |  |  | 26.5 |
Technology and other | 149.5 |  |  | (101.1) |  |  | 48.4 |  |  | 153.8 |  |  | (96.5) |  |  | 57.3 |
Total | $ | 1,119.8 |  |  | $ | (724.3) |  |  | $ | 395.5 |  |  | $ | 1,123.9 |  |  | $ | (667.2) |  |  | $ | 456.7 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name Accounting Standards Codification -Section 55 -Paragraph 40 -SubTopic 30 -Topic 350 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 + Details
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