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Goodwill and Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill [Table Text Block] | The following table provides a reconciliation of changes in goodwill for the three months ended March 31, 2021:
|  |  |  |  | Consolidated
|  |  |  |  | (in millions)
Balance at December 31, 2020 |  |  |  |  | $ | 185.7 |
Foreign currency translation |  |  |  |  | (1.0) |
Balance at March 31, 2021 |  |  |  |  | $ | 184.7 |
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:
| March 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 | $ | 47.9 |  |  | $ | (35.3) |  |  | $ | 12.6 |  |  | $ | 47.6 |  |  | $ | (33.9) |  |  | $ | 13.7 |
Customer platforms | 856.2 |  |  | (253.7) |  |  | 602.5 |  |  | 856.2 |  |  | (237.9) |  |  | 618.3 |
Customer relationships | 53.0 |  |  | (13.7) |  |  | 39.3 |  |  | 53.0 |  |  | (12.8) |  |  | 40.2 |
Technology and other | 156.3 |  |  | (51.3) |  |  | 105.0 |  |  | 156.7 |  |  | (48.2) |  |  | 108.5 |
Total | $ | 1,113.4 |  |  | $ | (354.0) |  |  | $ | 759.4 |  |  | $ | 1,113.5 |  |  | $ | (332.8) |  |  | $ | 780.7 |

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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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