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Goodwill and Intangible Assets | 9 Months Ended
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Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets Disclosure [Text Block] | 4. GOODWILL AND INTANGIBLE ASSETS Goodwill The following table provides a reconciliation of changes in goodwill for the nine months ended September 30, 2017:
| Driveline |  | Metal Forming |  | Powertrain |  | Casting |  | Consolidated
| (in millions)
Balance as of December 31, 2016 | $ | 130.1 |  |  | $ | 23.9 |  |  | $ | — |  |  | $ | — |  |  | $ | 154.0 |
Acquisition of MPG | — |  |  | 516.0 |  |  | 472.3 |  |  | 406.0 |  |  | 1,394.3 |
Acquisition of USM Mexico | 80.4 |  |  | — |  |  | — |  |  | — |  |  | 80.4 |
Foreign currency translation | 0.4 |  |  | 16.6 |  |  | 8.9 |  |  | — |  |  | 25.9 |
Balance as of September 30, 2017 | $ | 210.9 |  |  | $ | 556.5 |  |  | $ | 481.2 |  |  | $ | 406.0 |  |  | $ | 1,654.6 |
Intangible Assets As a result of the acquisitions of MPG and USM Mexico, AAM identified and recognized certain intangible assets that are subject to amortization. The weighted-average amortization period for all intangible assets recognized as a result of these acquisitions is 13.6 years. The following table provides a breakout of the major intangible assets acquired by class:
| Estimated |  | September 30,
| Useful Lives |  | 2017
| (years) |  | (in millions)
MPG |  |  |
Customer platforms | 14 |  | $ | 950.0 |
Customer relationships | 16-17 |  | 151.8 |
Technology and other | 5-13 |  | 121.3 |
Total MPG |  |  | $ | 1,223.1 |
USM Mexico |  |  |
Technology | 13 |  | $ | 29.5 |
Customer platforms | 13 |  | 2.2 |
Total USM Mexico |  |  | $ | 31.7 |
Total |  |  | $ | 1,254.8 |
In the third quarter of 2017, we made measurement period adjustments related to the acquisition of MPG to reflect changes to facts and circumstances that existed as of the acquisition date. These adjustments resulted in a decrease to customer platforms of $20.0 million and a decrease in customer relationships of $1.5 million as a result of changes to our third-party valuation and customary post-closing reviews. The impact to amortization expense in our Condensed Consolidated Statements of Income for the three and nine months ended September 30, 2017 as a result of adjusting our intangible assets was immaterial. 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:
| September 30, |  | December 31,
| 2017 |  | 2016
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
| (in millions)
Capitalized computer software | $ | 35.2 |  |  | $ | (12.8 | ) |  | $ | 22.4 |  |  | $ | 31.7 |  |  | $ | (8.5 | ) |  | $ | 23.2 |
e-AAM in-process research and development | 5.9 |  |  | — |  |  | 5.9 |  |  | 5.3 |  |  | — |  |  | 5.3 |
Customer platforms | 952.2 |  |  | (35.3 | ) |  | 916.9 |  |  | — |  |  | — |  |  | — |
Customer relationships | 151.8 |  |  | (4.9 | ) |  | 146.9 |  |  | — |  |  | — |  |  | — |
Technology and other | 150.8 |  |  | (6.3 | ) |  | 144.5 |  |  | — |  |  | — |  |  | — |
Total | $ | 1,295.9 |  |  | $ | (59.3 | ) |  | $ | 1,236.6 |  |  | $ | 37.0 |  |  | $ | (8.5 | ) |  | $ | 28.5 |
Amortization expense for these intangible assets was $24.4 million and $50.8 million for the three and nine months ended September 30, 2017, respectively, and $1.3 million and $3.6 million for the three and nine months ended September 30, 2016, respectively. Estimated amortization expense for each of the next five years is as follows: approximately $75 million in 2017 and approximately $100 million in each of the years 2018 through 2021.

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- Definition The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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