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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 |  |  |
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, 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) |  |
Changes in cash flow hedges, net of tax |  |  |  |  |  |  |  | (2.5) |
Foreign currency translation adjustments |  |  |  |  |  |  |  | (2.5) |
Defined benefit plans, net of tax |  |  |  |  |  |  |  | 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 |  |  |  | 1.2 | 1,292.6 | 703.5 | (201.8) | (311.6) | 2.4
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net income (loss) attributable to AAM |  | $ (30.1) |  |  |  |  |  |  |
Net income (loss) attributable to noncontrolling interest |  | 0.4 |  |  |  |  |  |  |
Purchase of treasury stock |  | 7.5 |  |  |  |  |  |  |
Changes in cash flow hedges, net of tax | [1] | (24.7) |  |  |  |  |  |  |
Foreign currency translation adjustments |  | (34.7) |  |  |  |  |  |  |
Foreign currency translation adjustments attributable to noncontrolling interests |  | 0.0 |  |  |  |  |  |  |
Defined benefit plans, net of tax | [2] | $ (0.5) |  |  |  |  |  |  |
Common stock, shares, outstanding at Sep. 30, 2019 |  | 112.5 |  |  |  |  |  |  |
Total AAM stockholders' equity at Sep. 30, 2019 |  |  |  | 1.2 | 1,310.1 | 703.0 | (209.3) | (398.2) | 2.8
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 (loss) attributable to AAM |  |  |  |  |  | 52.5 |  |  |
Net income (loss) attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 0.2
Stock-based compensation |  |  |  |  | 5.7 |  |  |  |
Treasury stock, shares, acquired |  | 0.0 |  |  |  |  |  |  |
Purchase of treasury stock |  |  |  |  |  |  | (0.2) |  |
Changes in cash flow hedges, net of tax |  |  |  |  |  |  |  | (15.8) |
Foreign currency translation adjustments |  |  |  |  |  |  |  | 4.9 |
Defined benefit plans, net of tax |  |  |  |  |  |  |  | 1.1 |
Common stock, shares, outstanding at Jun. 30, 2019 |  | 112.5 |  |  |  |  |  |  |
Total AAM stockholders' equity at Jun. 30, 2019 |  |  |  | 1.2 | 1,303.8 | 827.2 | (209.3) | (353.4) | 2.7
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net income (loss) attributable to AAM |  | $ (124.2) |  |  |  | (124.2) |  |  |
Net income (loss) attributable to noncontrolling interest |  | 0.1 |  |  |  |  |  |  | 0.1
Stock-based compensation |  |  |  |  | 6.3 |  |  |  |
Changes in cash flow hedges, net of tax |  | (6.4) | [1] |  |  |  |  | (6.4) |
Foreign currency translation adjustments |  | (37.1) |  |  |  |  |  | (37.1) |
Foreign currency translation adjustments attributable to noncontrolling interests |  | 0.0 |  |  |  |  |  |  |
Defined benefit plans, net of tax |  | $ 1.3 | [2] |  |  |  |  | (1.3) |
Common stock, shares, outstanding at Sep. 30, 2019 |  | 112.5 |  |  |  |  |  |  |
Total AAM stockholders' equity at Sep. 30, 2019 |  |  |  | 1.2 | 1,310.1 | 703.0 | (209.3) | (398.2) | 2.8
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) |  |  |
Net income (loss) attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 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) |  |
Changes in cash flow hedges, net of tax |  |  |  |  |  |  |  | (34.7) |
Foreign currency translation adjustments |  |  |  |  |  |  |  | (48.5) |
Foreign currency translation adjustments attributable to noncontrolling interests |  |  |  |  |  |  |  |  | (0.3)
Defined benefit plans, net of tax |  |  |  |  |  |  |  | 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, 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 |  | (597.3) |  |  |  |  |  |  |
Net income (loss) attributable to noncontrolling interest |  | 0.1 |  |  |  |  |  |  |
Purchase of treasury stock |  | 2.7 |  |  |  |  |  |  |
Changes in cash flow hedges, net of tax | [1] | (19.3) |  |  |  |  |  |  |
Foreign currency translation adjustments |  | (30.0) |  |  |  |  |  |  |
Foreign currency translation adjustments attributable to noncontrolling interests |  | (0.3) |  |  |  |  |  |  |
Defined benefit plans, net of tax | [2] | $ (5.0) |  |  |  |  |  |  |
Common stock, shares, outstanding at Sep. 30, 2020 |  | 113.3 |  |  |  |  |  |  |
Total AAM stockholders' equity at Sep. 30, 2020 |  | $ 340.9 |  | 1.2 | 1,328.3 | (355.8) | (212.0) | (420.8) | 2.6
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
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net income (loss) attributable to AAM |  |  |  |  |  | (213.2) |  |  |
Net income (loss) attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 0.0
Stock issued during period, shares, share-based compensation, net of forfeitures |  | 0.3 |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  | 4.7 |  |  |  |
Treasury stock, shares, acquired |  | 0.0 |  |  |  |  |  |  |
Purchase of treasury stock |  |  |  |  |  |  | (0.3) |  |
Changes in cash flow hedges, net of tax |  |  |  |  |  |  |  | 8.7 |
Foreign currency translation adjustments |  |  |  |  |  |  |  | 4.8 |
Defined benefit plans, net of tax |  |  |  |  |  |  |  | 1.7 |
Common stock, shares, outstanding at Jun. 30, 2020 |  | 113.3 |  |  |  |  |  |  |
Total AAM stockholders' equity at Jun. 30, 2020 |  |  |  | 1.2 | 1,323.2 | (473.0) | (212.0) | (443.2) | 2.6
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net income (loss) attributable to AAM |  | $ 117.2 |  |  |  | 117.2 |  |  |
Net income (loss) attributable to noncontrolling interest |  | 0.0 |  |  |  |  |  |  | 0.0
Stock-based compensation |  |  |  |  | 5.1 |  |  |  |
Changes in cash flow hedges, net of tax |  | 6.7 | [1] |  |  |  |  | 6.7 |
Foreign currency translation adjustments |  | 14.0 |  |  |  |  |  | 14.0 |
Foreign currency translation adjustments attributable to noncontrolling interests |  | 0.0 |  |  |  |  |  |  |
Defined benefit plans, net of tax |  | $ (1.7) | [2] |  |  |  |  | 1.7 |
Common stock, shares, outstanding at Sep. 30, 2020 |  | 113.3 |  |  |  |  |  |  |
Total AAM stockholders' equity at Sep. 30, 2020 |  | $ 340.9 |  | $ 1.2 | $ 1,328.3 | $ (355.8) | $ (212.0) | $ (420.8) | $ 2.6
[1] | Amounts are net of tax of $(0.2) million and $1.6 million for the three and nine months ended September 30, 2020, and $1.1 million and $7.3 million for the three and nine months ended September 30, 2019, respectively.
[2] | Amounts are net of tax of $(0.4) million and $(1.2) million for the three and nine months ended September 30, 2020, and $0.3 million and $(0.2) million for the three and nine months ended September 30, 2019, respectively.

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