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Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2017
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 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 |
Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block] | 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 |
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:
| 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 Tabular disclosure of the characteristics, including initial carrying value, residual amount, weighted average useful life, of finite-lived intangible assets acquired during the period by major class. A major class is composed of intangible assets that can be grouped together because they are similar, either by nature or by their use in the operations of the company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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