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Schedule of Goodwill and Finite Lived Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2021
Goodwill and Intangible Assets [Abstract] |
Schedule of Goodwill [Table Text Block] | Goodwill The following table provides a reconciliation of changes in goodwill for the year ended December 31, 2021 and the year ended December 31, 2020:
| Driveline |  | Metal Forming |  |  |  | Consolidated
| (in millions)
Balance as of January 1, 2020 | $ | 398.3 |  |  | $ | 300.8 |  |  |  |  | $ | 699.1 |
Impairment charge | (210.8) |  |  | (299.2) |  |  |  |  | (510.0) |
Foreign currency translation | (1.8) |  |  | (1.6) |  |  |  |  | (3.4) |
Balance as of December 31, 2020 | $ | 185.7 |  |  | $ | — |  |  |  |  | $ | 185.7 |
Foreign currency translation | (1.9) |  |  | — |  |  |  |  | (1.9) |
Balance as of December 31, 2021 | $ | 183.8 |  |  | $ | — |  |  |  |  | $ | 183.8 |
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, as of December 31, 2021 and December 31, 2020:
| December 31, |  | December 31,
| 2021 |  | 2020
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
| (in millions)
Capitalized computer software | $ | 47.3 |  |  | $ | (37.0) |  |  | $ | 10.3 |  |  | $ | 47.6 |  |  | $ | (33.9) |  |  | $ | 13.7 |
Customer platforms | 856.2 |  |  | (301.3) |  |  | 554.9 |  |  | 856.2 |  |  | (237.9) |  |  | 618.3 |
Customer relationships | 53.0 |  |  | (16.2) |  |  | 36.8 |  |  | 53.0 |  |  | (12.8) |  |  | 40.2 |
Technology and other | 156.1 |  |  | (60.9) |  |  | 95.2 |  |  | 156.7 |  |  | (48.2) |  |  | 108.5 |
Total | $ | 1,112.6 |  |  | $ | (415.4) |  |  | $ | 697.2 |  |  | $ | 1,113.5 |  |  | $ | (332.8) |  |  | $ | 780.7 |

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- Definition Goodwill and Intangible Assets [Abstract] + References No definition available. + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13854-109267 + Details
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