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Goodwill and Intangible Assets | 3 Months Ended
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Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets Disclosure [Text Block] | 4. GOODWILL AND OTHER INTANGIBLE ASSETS Goodwill The following table provides a reconciliation of changes in goodwill for the three months ended March 31, 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 | (0.8 | ) |  | (2.7 | ) |  | — |  |  | — |  |  | (3.5 | )
Balance as of March 31, 2019 | $ | 398.5 |  |  | $ | 739.8 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,138.3 |
In the first quarter of 2019, we initiated a global restructuring program (the 2019 Program) to further streamline our business by consolidating our four existing segments into three segments. See Note 3 - Restructuring and Acquisition-Related Costs for further detail on this reorganization of our segments. Prior to this reorganization, our Powertrain segment was also a reporting unit for purposes of measuring and reporting goodwill. The goodwill that was previously attributable to the Powertrain reporting unit was reallocated to the Driveline and Metal Forming reporting units based on the relative fair value of the respective portions that became attributable to those reporting units. The initiation of the 2019 Program and the reorganization of our business represented a triggering event in the first quarter of 2019 to test goodwill for impairment prior to reallocating the Powertrain goodwill to Driveline and Metal Forming. No impairment was identified as a result of completing this goodwill impairment test. Other Intangible Assets 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,
| 2019 |  | 2018
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
| (in millions)
Capitalized computer software | $ | 40.6 |  |  | $ | (22.9 | ) |  | $ | 17.7 |  |  | $ | 38.0 |  |  | $ | (20.1 | ) |  | $ | 17.9 |
Customer platforms | 952.2 |  |  | (141.1 | ) |  | 811.1 |  |  | 952.2 |  |  | (123.5 | ) |  | 828.7 |
Customer relationships | 147.0 |  |  | (19.0 | ) |  | 128.0 |  |  | 147.0 |  |  | (16.5 | ) |  | 130.5 |
Technology and other | 156.0 |  |  | (25.3 | ) |  | 130.7 |  |  | 156.2 |  |  | (22.2 | ) |  | 134.0 |
Total | $ | 1,295.8 |  |  | $ | (208.3 | ) |  | $ | 1,087.5 |  |  | $ | 1,293.4 |  |  | $ | (182.3 | ) |  | $ | 1,111.1 |
Amortization expense for our intangible assets was $25.0 million for the three months ended March 31, 2019, and $24.9 million for the three months ended March 31, 2018. Estimated amortization expense for each of the full years 2019 through 2023 is approximately $100 million.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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