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Goodwill and Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2018
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 three months ended March 31, 2018:
| Driveline |  | Metal Forming |  | Powertrain |  | Casting |  | Consolidated
| (in millions)
Balance as of December 31, 2017 | $ | 211.1 |  |  | $ | 558.9 |  |  | $ | 478.8 |  |  | $ | 405.5 |  |  | $ | 1,654.3 |
Acquisition of MPG | — |  |  | 0.9 |  |  | — |  |  | — |  |  | 0.9 |
Acquisition of USM Mexico | 1.3 |  |  | — |  |  | — |  |  | — |  |  | 1.3 |
Foreign currency translation | (0.2 | ) |  | 4.7 |  |  | 8.1 |  |  | — |  |  | 12.6 |
Balance as of March 31, 2018 | $ | 212.2 |  |  | $ | 564.5 |  |  | $ | 486.9 |  |  | $ | 405.5 |  |  | $ | 1,669.1 |
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:
| March 31, |  | December 31,
| 2018 |  | 2017
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
| (in millions)
Capitalized computer software | $ | 36.8 |  |  | $ | (15.7 | ) |  | $ | 21.1 |  |  | $ | 35.6 |  |  | $ | (14.3 | ) |  | $ | 21.3 |
e-AAM in-process research and development | 5.8 |  |  | (0.2 | ) |  | 5.6 |  |  | 5.9 |  |  | — |  |  | 5.9 |
Customer platforms | 952.2 |  |  | (70.5 | ) |  | 881.7 |  |  | 952.2 |  |  | (52.9 | ) |  | 899.3 |
Customer relationships | 151.8 |  |  | (9.9 | ) |  | 141.9 |  |  | 151.8 |  |  | (7.3 | ) |  | 144.5 |
Technology and other | 150.8 |  |  | (12.3 | ) |  | 138.5 |  |  | 150.8 |  |  | (9.3 | ) |  | 141.5 |
Total | $ | 1,297.4 |  |  | $ | (108.6 | ) |  | $ | 1,188.8 |  |  | $ | 1,296.3 |  |  | $ | (83.8 | ) |  | $ | 1,212.5 |
Amortization expense for these intangible assets was $24.9 million for the three months ended March 31, 2018, and $1.6 million for the three months ended March 31, 2017. Estimated amortization expense for each of the years 2018 through 2022 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://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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