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Unaudited Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | [1] | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Net sales | $ 1,437.9 |  | $ 1,414.1 |  | $ 515.3 |  | $ 1,343.5 |  | $ 1,430.0 |  | $ 1,677.4 |  | $ 1,704.3 | $ 1,719.2 | $ 4,710.8 | $ 6,530.9 | $ 7,270.4
Gross profit (loss) | 236.5 |  | 249.8 |  | (98.9) |  | 195.3 |  | 183.4 |  | 248.7 |  | 248.3 | 222.2 | 582.7 | 902.6 | 1,140.4
Net Income (loss) | 36.1 |  | 117.2 |  | (213.2) |  | (501.2) | [2] | (454.4) | [3] | (124.1) | [4] | 52.7 | 41.7 | (561.1) | (484.1) | (56.8)
Net Income (Loss) Attributable to AAM | $ 36.0 |  | $ 117.2 |  | $ (213.2) |  | $ (501.3) | [2] | $ (454.4) | [3] | $ (124.2) | [4] | $ 52.5 | $ 41.6 | $ (561.3) | $ (484.5) | $ (57.5)
Basic earnings (loss) per share | $ 0.30 | [5] | $ 0.99 | [5] | $ (1.88) | [5] | $ (4.45) | [2],[5] | $ (4.04) | [3] | $ (1.10) | [4] | $ 0.45 | $ 0.36 | $ (4.96) | $ (4.31) | $ (0.51)
Diluted earnings (loss) per share | $ 0.30 | [5] | $ 0.99 | [5] | $ (1.88) | [5] | $ (4.45) | [2],[5] | $ (4.04) | [3] | $ (1.10) | [4] | $ 0.45 | $ 0.36 | $ (4.96) | $ (4.31) | $ (0.51)
Impairment charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 510.0 | $ 665.0 | $ 485.5
Impairment of long-lived assets to be disposed of, net of tax |  |  |  |  |  |  |  |  |  |  | $ 178.0 |  |  |  |  |  |
Gain (Loss) on disposition of business, net of tax |  |  |  |  |  |  |  |  | $ 17.0 |  |  |  |  |  |  |  |
Gain on bargain purchase of business |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 10.8 | 0.0
Defined benefit plan, net periodic benefit cost (credit), loss (gain) due to settlement or curtailment, net of tax |  |  |  |  |  |  |  |  | 8.0 |  |  |  |  |  |  |  |
Driveline and Metal Forming [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charges |  |  |  |  |  |  | $ 510.0 |  |  |  |  |  |  |  |  |  |
Metal Forming [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,105.3 | $ 1,453.5 | $ 1,617.7
Impairment charges |  |  |  |  |  |  |  |  | $ 440.0 |  |  |  |  |  |  |  |
[1] | 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.
[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] | 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.
[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] | Full year basic and diluted EPS will not necessarily agree to the sum of the four quarters because each quarter is a separate calculation.

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