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Restructuring and Acquisition-Related Costs (Tables) | 3 Months Ended
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Mar. 31, 2018
Restructuring and Related Activities [Abstract] |
Restructuring and Related Costs [Table Text Block] | In 2016, AAM initiated actions under a global restructuring program focused on creating a more streamlined organization in addition to reducing our cost structure and preparing for acquisition integration activities. A summary of this activity for the first three months of 2018 and 2017 is shown below:
| Severance Charges |  | Implementation Costs |  | Total
| (in millions)
Accrual as of December 31, 2016 | $ | 0.6 |  |  | $ | 9.2 |  |  | $ | 9.8 |
Charges | 1.2 |  |  | 5.6 |  |  | 6.8 |
Cash utilization | (1.1 | ) |  | (1.5 | ) |  | (2.6 | )
Accrual as of March 31, 2017 | $ | 0.7 |  |  | $ | 13.3 |  |  | $ | 14.0 |
Accrual as of December 31, 2017 | $ | 0.3 |  |  | $ | — |  |  | $ | 0.3 |
Charges | 0.2 |  |  | 3.9 |  |  | 4.1 |
Cash utilization | (0.4 | ) |  | (0.5 | ) |  | (0.9 | )
Accrual as of March 31, 2018 | $ | 0.1 |  |  | $ | 3.4 |  |  | $ | 3.5 |
Business Combination, Separately Recognized Transactions [Table Text Block] | 2017, we completed the acquisitions of Metaldyne Performance Group, Inc. (MPG) and USM Mexico Manufacturing LLC (USM Mexico). During the three months ended March 31, 2018, we incurred the following charges related to these acquisitions:
| Acquisition-Related Costs |  | Integration Expenses |  | Total
| (in millions)
Charges | $ | 1.1 |  |  | $ | 13.1 |  |  | $ | 14.2 |
Total restructuring and acquisition-related charges | $ | 18.3 |

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- Definition Tabular disclosure of transactions that are recognized separately from the acquisition of assets and assumptions of liabilities in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Tabular disclosure of costs incurred for restructuring including, but not limited to, exit and disposal activities, remediation, implementation, integration, asset impairment, and charges against earnings from the write-down of assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 + Details
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