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Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions | Total | Common Stock | Additional Paid-in Capital | Retained Earnings (Accumulated Deficit) | Treasury Stock, Common | AOCI Attributable to Parent
--- | --- | --- | --- | --- | --- | ---
Common stock, shares, outstanding at Dec. 31, 2021 | 114.0 |  |  |  |  |
Total AAM stockholders' equity at Dec. 31, 2021 |  | $ 1.3 | $ 1,351.5 | $ (313.9) | $ (216.3) | $ (364.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) | $ 64.3 |  |  | 64.3 |  |
Changes in hedges | $ 32.8 |  |  |  |  | 32.8
Foreign currency translation adjustments |  |  |  |  |  | (38.4)
Defined benefit plans, net |  |  |  |  |  | 95.0
Stock issued during period, shares, share-based compensation, net of forfeitures | 0.8 |  |  |  |  |
Stock issued during period, value, share-based compensation, net of forfeitures |  | 0.0 |  |  |  |
Stock-based compensation |  |  | 17.7 |  |  |
Treasury stock, shares, acquired | (0.2) |  |  |  |  |
Purchase of treasury stock | $ 1.9 |  |  |  | (1.9) |
Common stock, shares, outstanding at Dec. 31, 2022 | 114.6 |  |  |  |  |
Total AAM stockholders' equity at Dec. 31, 2022 |  | 1.3 | 1,369.2 | (249.6) | (218.2) | (275.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) | $ (33.6) |  |  | (33.6) |  |
Changes in hedges | $ 3.5 |  |  |  |  | 3.5
Foreign currency translation adjustments |  |  |  |  |  | 7.4
Defined benefit plans, net |  |  |  |  |  | 1.6
Stock issued during period, shares, share-based compensation, net of forfeitures | 4.1 |  |  |  |  |
Stock issued during period, value, share-based compensation, net of forfeitures |  | 0.0 |  |  |  |
Stock-based compensation |  |  | 13.4 |  |  |
Treasury stock, shares, acquired | (1.6) |  |  |  |  |
Purchase of treasury stock | $ 14.7 |  |  |  | (14.7) |
Common stock, shares, outstanding at Dec. 31, 2023 | 117.1 |  |  |  |  |
Total AAM stockholders' equity at Dec. 31, 2023 | $ 604.9 | 1.3 | 1,382.6 | (283.2) | (232.9) | (262.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) | 35.0 |  |  | 35.0 |  |
Changes in hedges | $ (32.7) |  |  |  |  | (32.7)
Foreign currency translation adjustments |  |  |  |  |  | (44.7)
Defined benefit plans, net |  |  |  |  |  | (11.9)
Stock issued during period, shares, share-based compensation, net of forfeitures | 0.9 |  |  |  |  |
Stock issued during period, value, share-based compensation, net of forfeitures |  | 0.0 |  |  |  |
Stock-based compensation |  |  | 15.0 |  |  |
Treasury stock, shares, acquired | (0.4) |  |  |  |  |
Purchase of treasury stock | $ 2.8 |  |  |  | (2.8) |
Common stock, shares, outstanding at Dec. 31, 2024 | 117.6 |  |  |  |  |
Total AAM stockholders' equity at Dec. 31, 2024 | $ 562.8 | $ 1.3 | $ 1,397.6 | $ (248.2) | $ (235.7) | $ (352.2)

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