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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, 2018 | 111.7 |  |  |  |  |  |
Total AAM stockholders' equity at Dec. 31, 2018 |  | $ 1.2 | $ 1,292.6 | $ 703.5 | $ (201.8) | $ (311.6) | $ 2.4
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income (loss) attributable to AAM | $ 41.6 |  |  | 41.6 |  |  |
Net income (loss) attributable to noncontrolling interest | $ 0.1 |  |  |  |  |  | 0.1
Stock issued during period, shares, share-based compensation, net of forfeitures | 1.2 |  |  |  |  |  |
Stock-based compensation |  |  | 5.5 |  |  |  |
New accounting pronouncement, effect of adoption | ASU 2016-02 [Member] |  |  |  | 1.9 |  |  |
New accounting pronouncement, effect of adoption | ASU 2018-02 [Member] |  |  |  | 27.7 |  | (27.7) |
Treasury stock, shares, acquired | (0.4) |  |  |  |  |  |
Purchase of treasury stock | $ 7.3 |  |  |  | (7.3) |  |
Change in cash flow hedges, net of tax | (2.5) |  |  |  |  | (2.5) |
Foreign currency translation adjustments | (2.5) |  |  |  |  | (2.5) |
Foreign currency translation adjustments attributable to noncontrolling interests | 0.0 |  |  |  |  |  |
Defined benefit plans, net of tax | $ (0.7) |  |  |  |  | 0.7 |
Common stock, shares, outstanding at Mar. 31, 2019 | 112.5 |  |  |  |  |  |
Total AAM stockholders' equity at Mar. 31, 2019 |  | 1.2 | 1,298.1 | 774.7 | (209.1) | (343.6) | 2.5
Common stock, shares, outstanding at Dec. 31, 2019 | 112.6 |  |  |  |  |  |
Total AAM stockholders' equity at Dec. 31, 2019 | $ 977.6 | 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) |  |
Change in cash flow hedges, net of tax | (34.7) |  |  |  |  | (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) |  |  |  |  | 1.6 |
Common stock, shares, outstanding at Mar. 31, 2020 | 113.0 |  |  |  |  |  |
Total AAM stockholders' equity at Mar. 31, 2020 | $ 389.8 | $ 1.2 | $ 1,318.5 | $ (259.8) | $ (211.7) | $ (458.4) | $ 2.6

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