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Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2022
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, 2022:
|  |  |  |  | Consolidated
|  |  |  |  | (in millions)
Balance at December 31, 2021 |  |  |  |  | $ | 183.8 |
Foreign currency translation |  |  |  |  | (4.5) |
Balance at September 30, 2022 |  |  |  |  | $ | 179.3 |
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,
| 2022 |  | 2021
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
| (in millions)
Capitalized computer software | $ | 51.3 |  |  | $ | (42.0) |  |  | $ | 9.3 |  |  | $ | 47.3 |  |  | $ | (37.0) |  |  | $ | 10.3 |
Customer platforms | 856.2 |  |  | (348.9) |  |  | 507.3 |  |  | 856.2 |  |  | (301.3) |  |  | 554.9 |
Customer relationships | 53.0 |  |  | (18.8) |  |  | 34.2 |  |  | 53.0 |  |  | (16.2) |  |  | 36.8 |
Technology and other | 153.8 |  |  | (68.4) |  |  | 85.4 |  |  | 156.1 |  |  | (60.9) |  |  | 95.2 |
Total | $ | 1,114.3 |  |  | $ | (478.1) |  |  | $ | 636.2 |  |  | $ | 1,112.6 |  |  | $ | (415.4) |  |  | $ | 697.2 |

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