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Schedule of Finite Lived Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2019
Goodwill and Intangible Assets [Abstract] |
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 total intangible assets, which are all subject to amortization, as of December 31, 2019 and December 31, 2018:
| December 31, |  | December 31,
| 2019 |  | 2018
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
| (in millions)
Capitalized computer software | $ | 45.8 |  |  | $ | (27.6 | ) |  | $ | 18.2 |  |  | $ | 38.0 |  |  | $ | (20.1 | ) |  | $ | 17.9 |
Customer platforms | 856.2 |  |  | (174.4 | ) |  | 681.8 |  |  | 952.2 |  |  | (123.5 | ) |  | 828.7 |
Customer relationships | 53.0 |  |  | (9.4 | ) |  | 43.6 |  |  | 147.0 |  |  | (16.5 | ) |  | 130.5 |
Technology and other | 156.0 |  |  | (35.1 | ) |  | 120.9 |  |  | 156.2 |  |  | (22.2 | ) |  | 134.0 |
Total | $ | 1,111.0 |  |  | $ | (246.5 | ) |  | $ | 864.5 |  |  | $ | 1,293.4 |  |  | $ | (182.3 | ) |  | $ | 1,111.1 |

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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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