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Goodwill and Other Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill [Table Text Block] | The following table provides a reconciliation of changes in goodwill for the six months ended June 30, 2024:
|  |  |  |  | Consolidated
|  |  |  |  | (in millions)
Balance at December 31, 2023 |  |  |  |  | $ | 182.1 |
Foreign currency translation |  |  |  |  | (0.9) |
Balance at June 30, 2024 |  |  |  |  | $ | 181.2 |
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:
| June 30, |  | December 31,
| 2024 |  | 2023
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
| (in millions)
Capitalized computer software | $ | 54.5 |  |  | $ | (50.8) |  |  | $ | 3.7 |  |  | $ | 54.2 |  |  | $ | (49.2) |  |  | $ | 5.0 |
Customer platforms | 856.2 |  |  | (459.9) |  |  | 396.3 |  |  | 856.2 |  |  | (428.2) |  |  | 428.0 |
Customer relationships | 53.0 |  |  | (24.8) |  |  | 28.2 |  |  | 53.0 |  |  | (23.1) |  |  | 29.9 |
Technology and other | 154.0 |  |  | (90.4) |  |  | 63.6 |  |  | 154.3 |  |  | (84.4) |  |  | 69.9 |
Total | $ | 1,117.7 |  |  | $ | (625.9) |  |  | $ | 491.8 |  |  | $ | 1,117.7 |  |  | $ | (584.9) |  |  | $ | 532.8 |

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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 -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 40 -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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