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Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2020
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, 2020:
| Driveline |  | Metal Forming |  |  |  |  |  | Consolidated
| (in millions)
Balance at December 31, 2019 | $ | 398.3 |  |  | $ | 300.8 |  |  |  |  |  |  | $ | 699.1 |
Impairment charge | (210.8) |  |  | (299.2) |  |  |  |  |  |  | (510.0) |
Foreign currency translation | (3.9) |  |  | (1.6) |  |  |  |  |  |  | (5.5) |
Balance at September 30, 2020 | $ | 183.6 |  |  | $ | — |  |  |  |  |  |  | $ | 183.6 |
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,
| 2020 |  | 2019
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
| (in millions)
Capitalized computer software | $ | 47.2 |  |  | $ | (32.3) |  |  | $ | 14.9 |  |  | $ | 45.8 |  |  | $ | (27.6) |  |  | $ | 18.2 |
Customer platforms | 856.2 |  |  | (222.0) |  |  | 634.2 |  |  | 856.2 |  |  | (174.4) |  |  | 681.8 |
Customer relationships | 53.0 |  |  | (12.0) |  |  | 41.0 |  |  | 53.0 |  |  | (9.4) |  |  | 43.6 |
Technology and other | 156.1 |  |  | (44.7) |  |  | 111.4 |  |  | 156.0 |  |  | (35.1) |  |  | 120.9 |
Total | $ | 1,112.5 |  |  | $ | (311.0) |  |  | $ | 801.5 |  |  | $ | 1,111.0 |  |  | $ | (246.5) |  |  | $ | 864.5 |

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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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