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Revenue from Contracts with Customers (Notes) | 3 Months Ended
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Mar. 31, 2020
Revenue from Contract with Customer [Abstract] |
Revenue from Contract with Customer [Text Block] | 13. REVENUE FROM CONTRACTS WITH CUSTOMERS Net sales recognized from contracts with customers, disaggregated by segment and geographical location, are presented in the following table for the three months ended March 31, 2020 and 2019. Net sales are attributed to regions based on the location of production. Intersegment sales have been excluded from the table. In the fourth quarter of 2019, we completed the sale of the U.S operations of our former Casting segment (the Casting Sale). The Casting Sale did not include the entities that conduct AAM's casting operations in El Carmen, Mexico, which are now included in our Driveline segment. The Casting Sale did not qualify for classification as discontinued operations, as it did not represent a strategic shift in our business that has had, or will have, a major effect on our operations and financial results. As such, we continue to present Casting as a segment in the table below for the three months ended March 31, 2019, and the reported amounts are now comprised entirely of the U.S. casting operations that were included in the sale. The amounts previously reported in our Casting segment for the retained operations in El Carmen, Mexico have been reclassified to our Driveline segment for the three months ended March 31, 2019.
|  | Three Months Ended March 31, 2020 |  |  |  |  |  |
|  | Driveline |  | Metal Forming |  | Casting |  | Total
North America |  | $ | 791.3 |  |  | $ | 261.6 |  |  | $ | — |  |  | $ | 1,052.9 |
Asia |  | 103.1 |  |  | 6.1 |  |  | — |  |  | 109.2 |
Europe |  | 98.9 |  |  | 61.2 |  |  | — |  |  | 160.1 |
South America |  | 18.7 |  |  | 2.6 |  |  | — |  |  | 21.3 |
Total |  | $ | 1,012.0 |  |  | $ | 331.5 |  |  | $ | — |  |  | $ | 1,343.5 |
|  | Three Months Ended March 31, 2019 |  |  |  |  |  |
|  | Driveline |  | Metal Forming |  | Casting |  | Total
North America |  | $ | 868.0 |  |  | $ | 305.4 |  |  | $ | 182.4 |  |  | $ | 1,355.8 |
Asia |  | 153.3 |  |  | 7.5 |  |  | — |  |  | 160.8 |
Europe |  | 101.6 |  |  | 72.7 |  |  | — |  |  | 174.3 |
South America |  | 25.8 |  |  | 2.5 |  |  | — |  |  | 28.3 |
Total |  | $ | 1,148.7 |  |  | $ | 388.1 |  |  | $ | 182.4 |  |  | $ | 1,719.2 |
Contract Assets and Liabilities The following table summarizes our beginning and ending balances for accounts receivable and contract liabilities associated with our contracts with customers:
| Accounts Receivable, Net | Contract Liabilities (Current) | Contract Liabilities (Long-term)
December 31, 2019 | $ | 815.4 |  | $ | 18.9 |  | $ | 83.7 |
March 31, 2020 | 794.7 |  | 21.3 |  | 77.5 |
Increase/(decrease) | $ | (20.7) |  | $ | 2.4 |  | $ | (6.2) |
Contract liabilities relate to deferred revenue associated with various settlements and commercial agreements for which we have a future performance obligation to the customer. We recognize this deferred revenue into revenue over the life of the associated program as we satisfy our performance obligations to the customer. We do not have contract assets as defined in ASC 606. During the three months ended March 31, 2020, we amortized $6.7 million of previously recorded contract liabilities into revenue as we satisfied performance obligations with our customers.

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130550-203045 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130558-203045 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 + Details
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