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Goodwill and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2023
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, 2023:
|  |  |  |  | Consolidated
|  |  |  |  | (in millions)
Balance at December 31, 2022 |  |  |  |  | $ | 181.6 |
Foreign currency translation |  |  |  |  | (0.6) |
Balance at September 30, 2023 |  |  |  |  | $ | 181.0 |
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,
| 2023 |  | 2022
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
| (in millions)
Capitalized computer software | $ | 53.4 |  |  | $ | (47.7) |  |  | $ | 5.7 |  |  | $ | 52.2 |  |  | $ | (43.2) |  |  | $ | 9.0 |
Customer platforms | 856.2 |  |  | (412.3) |  |  | 443.9 |  |  | 856.2 |  |  | (364.7) |  |  | 491.5 |
Customer relationships | 53.0 |  |  | (22.2) |  |  | 30.8 |  |  | 53.0 |  |  | (19.7) |  |  | 33.3 |
Technology and other | 153.9 |  |  | (81.0) |  |  | 72.9 |  |  | 154.1 |  |  | (71.7) |  |  | 82.4 |
Total | $ | 1,116.5 |  |  | $ | (563.2) |  |  | $ | 553.3 |  |  | $ | 1,115.5 |  |  | $ | (499.3) |  |  | $ | 616.2 |

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