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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 | Treasury Stock | AOCI Attributable to Parent | Noncontrolling Interest
--- | --- | --- | --- | --- | --- | --- | ---
Common stock, shares, outstanding at Dec. 31, 2017 | 111.3 |  |  |  |  |  |
Total AAM stockholders' equity at Dec. 31, 2017 |  | $ 1.2 | $ 1,264.6 | $ 761.0 | $ (198.1) | $ (292.7) | $ 4.0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net Income attributable to AAM |  |  |  | 89.4 |  |  |
Net income (loss) attributable to noncontrolling interest |  |  |  |  |  |  | 0.1
Stock issued during period, shares, share-based compensation, net of forfeitures | 0.6 |  |  |  |  |  |
Stock-based compensation |  |  | 6.6 |  |  |  |
Treasury stock, shares, acquired | (0.2) |  |  |  |  |  |
Purchase of treasury stock |  |  |  |  | (3.5) |  |
Changes in cash flow hedges |  |  |  |  |  | 15.1 |
Foreign currency translation adjustments |  |  |  |  |  | 37.9 |
Defined benefit plans, net |  |  |  |  |  | 1.3 |
Purchase of noncontrolling interest |  |  |  |  |  |  | (0.9)
Common stock, shares, outstanding at Mar. 31, 2018 | 111.7 |  |  |  |  |  |
Total AAM stockholders' equity at Mar. 31, 2018 |  | 1.2 | 1,271.2 | 850.4 | (201.6) | (238.4) | 3.2
Common stock, shares, outstanding at Dec. 31, 2017 | 111.3 |  |  |  |  |  |
Total AAM stockholders' equity at Dec. 31, 2017 |  | 1.2 | 1,264.6 | 761.0 | (198.1) | (292.7) | 4.0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net Income attributable to AAM | $ 240.5 |  |  |  |  |  |
Net income (loss) attributable to noncontrolling interest | 0.3 |  |  |  |  |  |
Purchase of treasury stock | $ 3.6 |  |  |  |  |  |
Common stock, shares, outstanding at Jun. 30, 2018 | 111.7 |  |  |  |  |  |
Total AAM stockholders' equity at Jun. 30, 2018 |  | 1.2 | 1,278.3 | 1,001.5 | (201.7) | (315.1) | 2.0
Common stock, shares, outstanding at Mar. 31, 2018 | 111.7 |  |  |  |  |  |
Total AAM stockholders' equity at Mar. 31, 2018 |  | 1.2 | 1,271.2 | 850.4 | (201.6) | (238.4) | 3.2
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net Income attributable to AAM | $ 151.1 |  |  | 151.1 |  |  |
Net income (loss) attributable to noncontrolling interest | $ 0.2 |  |  |  |  |  | 0.2
Stock-based compensation |  |  | 7.1 |  |  |  |
Treasury stock, shares, acquired | 0.0 |  |  |  |  |  |
Purchase of treasury stock |  |  |  |  | (0.1) |  |
Changes in cash flow hedges |  |  |  |  |  | (7.9) |
Foreign currency translation adjustments |  |  |  |  |  | (81.0) |
Defined benefit plans, net |  |  |  |  |  | 12.2 |
Purchase of noncontrolling interest |  |  |  |  |  |  | (1.4)
Common stock, shares, outstanding at Jun. 30, 2018 | 111.7 |  |  |  |  |  |
Total AAM stockholders' equity at Jun. 30, 2018 |  | 1.2 | 1,278.3 | 1,001.5 | (201.7) | (315.1) | 2.0
Common stock, shares, outstanding at Dec. 31, 2018 | 111.7 |  |  |  |  |  |
Total AAM stockholders' equity at Dec. 31, 2018 | $ 1,483.9 | 1.2 | 1,292.6 | 703.5 | (201.8) | (311.6) | 2.4
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net Income attributable to AAM |  |  |  | 41.6 |  |  |
Net income (loss) attributable to noncontrolling interest |  |  |  |  |  |  | 0.1
Stock issued during period, shares, share-based compensation, net of forfeitures | 1.2 |  |  |  |  |  |
Stock-based compensation |  |  | 5.5 |  |  |  |
New accounting pronouncement or change in accounting principle, effect of adoption, quantification | ASU 2016-02 [Member] |  |  |  | 1.9 |  |  |
New accounting pronouncement or change in accounting principle, effect of adoption, quantification | ASU 2018-02 [Member] |  |  |  | 27.7 |  | (27.7) |
Treasury stock, shares, acquired | (0.4) |  |  |  |  |  |
Purchase of treasury stock |  |  |  |  | (7.3) |  |
Changes in cash flow hedges |  |  |  |  |  | (2.5) |
Foreign currency translation adjustments |  |  |  |  |  | (2.5) |
Defined benefit plans, net |  |  |  |  |  | 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, 2018 | 111.7 |  |  |  |  |  |
Total AAM stockholders' equity at Dec. 31, 2018 | $ 1,483.9 | 1.2 | 1,292.6 | 703.5 | (201.8) | (311.6) | 2.4
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net Income attributable to AAM | 94.1 |  |  |  |  |  |
Net income (loss) attributable to noncontrolling interest | 0.3 |  |  |  |  |  |
Purchase of treasury stock | $ 7.5 |  |  |  |  |  |
Common stock, shares, outstanding at Jun. 30, 2019 | 112.5 |  |  |  |  |  |
Total AAM stockholders' equity at Jun. 30, 2019 | $ 1,569.5 | 1.2 | 1,303.8 | 827.2 | (209.3) | (353.4) | 2.7
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
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net Income attributable to AAM | $ 52.5 |  |  | 52.5 |  |  |
Net income (loss) attributable to noncontrolling interest | $ 0.2 |  |  |  |  |  | 0.2
Stock-based compensation |  |  | 5.7 |  |  |  |
Treasury stock, shares, acquired | 0.0 |  |  |  |  |  |
Purchase of treasury stock |  |  |  |  | (0.2) |  |
Changes in cash flow hedges |  |  |  |  |  | (15.8) |
Foreign currency translation adjustments |  |  |  |  |  | 4.9 |
Defined benefit plans, net |  |  |  |  |  | 1.1 |
Common stock, shares, outstanding at Jun. 30, 2019 | 112.5 |  |  |  |  |  |
Total AAM stockholders' equity at Jun. 30, 2019 | $ 1,569.5 | $ 1.2 | $ 1,303.8 | $ 827.2 | $ (209.3) | $ (353.4) | $ 2.7

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