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Schedule of Finite Lived Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items] |
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, as of December 31, 2018 and December 31, 2017:
| December 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 | $ | 38.0 |  |  | $ | (20.1 | ) |  | $ | 17.9 |  |  | $ | 35.6 |  |  | $ | (14.3 | ) |  | $ | 21.3 |
Customer platforms | 952.2 |  |  | (123.5 | ) |  | 828.7 |  |  | 952.2 |  |  | (52.9 | ) |  | 899.3 |
Customer relationships | 147.0 |  |  | (16.5 | ) |  | 130.5 |  |  | 151.8 |  |  | (7.3 | ) |  | 144.5 |
Technology and other | 156.2 |  |  | (22.2 | ) |  | 134.0 |  |  | 150.8 |  |  | (9.3 | ) |  | 141.5 |
Total | $ | 1,293.4 |  |  | $ | (182.3 | ) |  | $ | 1,111.1 |  |  | $ | 1,290.4 |  |  | $ | (83.8 | ) |  | $ | 1,206.6 |

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