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Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions | Total | Common Stock | Additional Paid-in Capital | Retained Earnings (Accumulated Deficit) | Treasury Stock | AOCI Attributable to Parent | Noncontrolling Interest
--- | --- | --- | --- | --- | --- | --- | ---
Common stock, shares, outstanding at Dec. 31, 2019 | 112.6 |  |  |  |  |  |  |
Total AAM stockholders' equity at Dec. 31, 2019 |  |  | $ 1.2 | $ 1,313.9 | $ 248.6 | $ (209.3) | $ (376.8) | $ 2.8
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income (loss) attributable to AAM | $ (501.3) |  |  |  | (501.3) |  |  |
Net income (loss) attributable to noncontrolling interest | $ 0.1 |  |  |  |  |  |  | 0.1
Stock issued during period, shares, share-based compensation, net of forfeitures | 0.8 |  |  |  |  |  |  |
Stock-based compensation |  |  |  | 4.6 |  |  |  |
New accounting pronouncement, effect of adoption | ASU 2016-13 [Member] |  |  |  |  | (7.1) |  |  |
Treasury stock, shares, acquired | (0.4) |  |  |  |  |  |  |
Purchase of treasury stock | $ 2.4 |  |  |  |  | (2.4) |  |
Changes in cash flow hedges, net of tax | (34.7) | [1] |  |  |  |  | (34.7) |
Foreign currency translation adjustments | (48.8) |  |  |  |  |  | (48.5) |
Foreign currency translation adjustments attributable to noncontrolling interests | (0.3) |  |  |  |  |  |  | (0.3)
Defined benefit plans, net of tax | $ (1.6) | [2] |  |  |  |  | 1.6 |
Common stock, shares, outstanding at Mar. 31, 2020 | 113.0 |  |  |  |  |  |  |
Total AAM stockholders' equity at Mar. 31, 2020 |  |  | 1.2 | 1,318.5 | (259.8) | (211.7) | (458.4) | 2.6
Common stock, shares, outstanding at Dec. 31, 2020 | 113.3 |  |  |  |  |  |  |
Total AAM stockholders' equity at Dec. 31, 2020 | $ 370.5 |  | 1.2 | 1,333.3 | (319.8) | (212.0) | (432.2) | 2.7
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income (loss) attributable to AAM | 38.6 |  |  |  | 38.6 |  |  |
Net income (loss) attributable to noncontrolling interest | $ 0.0 |  |  |  |  |  |  | 0.0
Stock issued during period, shares, share-based compensation, net of forfeitures | 1.0 |  |  |  |  |  |  |
Exercise of stock options | $ 0.1 |  |  |  |  |  |  |
Stock-based compensation |  |  |  | 5.3 |  |  |  |
Treasury stock, shares, acquired | (0.4) |  |  |  |  |  |  |
Purchase of treasury stock | $ 4.0 |  |  |  |  | (4.0) |  |
Changes in cash flow hedges, net of tax | (0.3) | [1] |  |  |  |  | (0.3) |
Foreign currency translation adjustments | (11.0) |  |  |  |  |  | (11.0) |
Foreign currency translation adjustments attributable to noncontrolling interests | 0.0 |  |  |  |  |  |  | 0.0
Defined benefit plans, net of tax | $ (2.1) | [2] |  |  |  |  | 2.1 |
Loss on sale of business |  |  |  |  |  |  |  | (2.7)
Common stock, shares, outstanding at Mar. 31, 2021 | 113.9 |  |  |  |  |  |  |
Total AAM stockholders' equity at Mar. 31, 2021 | $ 401.3 |  | $ 1.3 | $ 1,338.6 | $ (281.2) | $ (216.0) | $ (441.4) | $ 0.0
[1] | Amounts are net of tax of $(1.3) million for the three months ended March 31, 2021, and $2.3 million for the three months ended March 31, 2020, respectively.
[2] | Amounts are net of tax of $(0.6) million for the three months ended March 31, 2021, and $(0.4) million for the three months ended March 31, 2020, respectively.

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