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Unaudited Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information [Table Text Block] |
| Three Months Ended, |
| March 31 |  | June 30 |  | September 30 |  | December 31 |
| (in millions, except per share data) |
2020 |  |  |  |  |  |  |  |
Net sales | $ | 1,343.5 |  |  | $ | 515.3 |  | (3) | $ | 1,414.1 |  |  | $ | 1,437.9 |  |
Gross profit | 195.3 |  |  | (98.9) |  | (3) | 249.8 |  |  | 236.5 |  |
Net income (loss) | (501.2) |  | (2) | (213.2) |  | (3) | 117.2 |  |  | 36.1 |  |
Net income (loss) attributable to AAM | (501.3) |  | (2) | (213.2) |  | (3) | 117.2 |  |  | 36.0 |  |
Basic EPS (1) | $ | (4.45) |  | (2) | $ | (1.88) |  | (3) | $ | 0.99 |  |  | $ | 0.30 |  |
Diluted EPS (1) | $ | (4.45) |  | (2) | $ | (1.88) |  | (3) | $ | 0.99 |  |  | $ | 0.30 |  |
2019 |  |  |  |  |  |  |  |
Net sales | $ | 1,719.2 |  |  | $ | 1,704.3 |  |  | $ | 1,677.4 |  |  | $ | 1,430.0 |  |
Gross profit | 222.2 |  |  | 248.3 |  |  | 248.7 |  |  | 183.4 |  |
Net income (loss) | 41.7 |  |  | 52.7 |  |  | (124.1) |  | (4) | (454.4) |  | (5)
Net income (loss) attributable to AAM | 41.6 |  |  | 52.5 |  |  | (124.2) |  | (4) | (454.4) |  | (5)
Basic EPS (1) | $ | 0.36 |  |  | $ | 0.45 |  |  | $ | (1.10) |  | (4) | $ | (4.04) |  | (5)
Diluted EPS (1) | $ | 0.36 |  |  | $ | 0.45 |  |  | $ | (1.10) |  | (4) | $ | (4.04) |  | (5)
(1) Full year basic and diluted EPS will not necessarily agree to the sum of the four quarters because each quarter is a separate calculation. (2) In the first quarter of 2020, we recorded a goodwill impairment charge of $510 million that was not subject to tax effect as a result of the significant decline in automotive production volumes due to the impact of COVID-19. (3) Many of our plant locations temporarily suspended production or experienced a significant reduction in production volumes during the second quarter of 2020 as a result of the impact of COVID-19. (4) In the third quarter of 2019, we recorded an impairment charge of approximately $178 million, net of tax, to reduce the carrying value of our U.S. Casting operations to fair value less cost to sell upon reclassification of the assets and liabilities to held-for-sale. (5) In the fourth quarter of 2019, we recorded a goodwill impairment charge of $440 million that was not subject to tax effect associated with the annual goodwill impairment test for our Metal Forming reporting unit. We also recorded a loss on the Casting Sale of approximately $17 million, net of tax, recognized a gain on bargain purchase of approximately $10.8 million, which was not subject to tax effect, associated with the acquisition of Mitec, and recognized a loss of approximately $8 million, net of tax, related to pension settlements.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121640914&loc=d3e1280-108306 + Details
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