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Disaggregation of Revenue (Tables) | 3 Months Ended
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Mar. 31, 2020
Disaggregation of Revenue [Line Items] |
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) |

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