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Goodwill and Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill [Table Text Block] | Goodwill The following table provides a reconciliation of changes in goodwill for the six months ended June 30, 2019:
| Driveline |  | Metal Forming |  | Powertrain |  | Casting |  | Consolidated
| (in millions)
Balance as of December 31, 2018 | $ | 212.1 |  |  | $ | 552.4 |  |  | $ | 377.3 |  |  | $ | — |  |  | $ | 1,141.8 |
Reorganization | 187.2 |  |  | 190.1 |  |  | (377.3 | ) |  | — |  |  | — |
Foreign currency translation | (1.1 | ) |  | 0.2 |  |  | — |  |  | — |  |  | (0.9 | )
Balance as of June 30, 2019 | $ | 398.2 |  |  | $ | 742.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,140.9 |
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,
| 2019 |  | 2018
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
| (in millions)
Capitalized computer software | $ | 41.0 |  |  | $ | (24.5 | ) |  | $ | 16.5 |  |  | $ | 38.0 |  |  | $ | (20.1 | ) |  | $ | 17.9 |
Customer platforms | 952.2 |  |  | (158.7 | ) |  | 793.5 |  |  | 952.2 |  |  | (123.5 | ) |  | 828.7 |
Customer relationships | 147.0 |  |  | (21.3 | ) |  | 125.7 |  |  | 147.0 |  |  | (16.5 | ) |  | 130.5 |
Technology and other | 156.0 |  |  | (28.6 | ) |  | 127.4 |  |  | 156.2 |  |  | (22.2 | ) |  | 134.0 |
Total | $ | 1,296.2 |  |  | $ | (233.1 | ) |  | $ | 1,063.1 |  |  | $ | 1,293.4 |  |  | $ | (182.3 | ) |  | $ | 1,111.1 |
Amortization expense for our intangible assets was $24.9 million and $49.9 million for the three and six months ended June 30, 2019, respectively, and $24.8 million and $49.7 million for the three and six months ended June 30, 2018, respectively. Estimated amortization expense for each of the full years 2019 through 2023 is approximately $100 million.

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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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