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Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Treasury Stock [Member] | AOCI Attributable to Parent [Member] | Noncontrolling Interest [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Common stock, shares, outstanding at Dec. 31, 2016 | 76.5 |  |  |  |  |  |
Total AAM stockholders' equity at Dec. 31, 2016 |  | $ 0.9 | $ 660.1 | $ 423.9 | $ (191.1) | $ (389.6) | $ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income (loss) attributable to AAM | $ 337.1 |  |  | 337.1 |  |  |
Net income attributable to noncontrolling interests | $ (0.4) |  |  |  |  |  | 0.4
Changes in cash flow hedges |  |  |  |  |  | 17.1 |
Foreign currency translation adjustments |  |  |  |  |  | 88.3 |
Defined benefit plans, net |  |  |  |  |  | (8.5) |
Stock issued during period, shares, acquisitions | 34.3 |  |  |  |  |  |
Acquisition of MPG | $ 576.7 | 0.3 | 579.6 |  | (1.7) |  | 3.6
Stock issued during period, shares, share-based compensation, net of forfeitures | 0.8 |  |  |  |  |  |
Stock issued during period, value, share-based compensation, net of forfeitures |  |  | 0.9 |  |  |  |
Stock-based compensation |  |  | 24.0 |  |  |  |
Treasury stock, shares, acquired | (0.3) |  |  |  |  |  |
Purchase of treasury stock | $ 7.0 |  |  |  | (5.3) |  |
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 (loss) attributable to AAM | $ (57.5) |  |  | (57.5) |  |  |
Net income attributable to noncontrolling interests | (0.7) |  |  |  |  |  | 0.7
Changes in cash flow hedges |  |  |  |  |  | 5.5 |
Foreign currency translation adjustments |  |  |  |  |  | (62.5) |
Defined benefit plans, net |  |  |  |  |  | 38.1 |
Acquisition of MPG | $ 0.0 |  |  |  |  |  |
Purchase of noncontrolling interest |  |  |  |  |  |  | (2.3)
Stock issued during period, shares, share-based compensation, net of forfeitures | 0.7 |  |  |  |  |  |
Stock issued during period, value, share-based compensation, net of forfeitures |  |  | 0.1 |  |  |  |
Stock-based compensation |  |  | 27.9 |  |  |  |
Treasury stock, shares, acquired | (0.3) |  |  |  |  |  |
Purchase of treasury stock | $ 3.7 |  |  |  | (3.7) |  |
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 (loss) attributable to AAM | (484.5) |  |  | (484.5) |  |  |
Net income attributable to noncontrolling interests | (0.4) |  |  |  |  |  | 0.4
Changes in cash flow hedges |  |  |  |  |  | (14.6) |
Foreign currency translation adjustments |  |  |  |  |  | (4.6) |
Defined benefit plans, net |  |  |  |  |  | (18.3) |
Acquisition of MPG | $ 0.0 |  |  |  |  |  |
Stock issued during period, shares, share-based compensation, net of forfeitures | 1.3 |  |  |  |  |  |
Stock-based compensation |  |  | 21.3 |  |  |  |
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 | $ 7.5 |  |  |  | (7.5) |  |
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

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