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Consolidated Statements of Stockholders' Equity (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Paid in Capital | $ 600.9 | $ 597.2 | $ 600.9 | $ 597.2 |  |
Accumulated Deficit | (275.8) | (643.5) | (275.8) | (643.5) |  |
Treasury Stock | (182.1) | (176.2) | (182.1) | (176.2) |  |
Noncontrolling interest in subsidiaries | 0 | 5.9 | 0 | 5.9 | 11.4 | 0.3
Net income attributable to AAM | 319.9 | 31.1 | 367.7 | 142.8 | 115.4 |
Net loss attributable to the noncontrolling interests |  |  | (1.0) | (5.7) | (0.9) |
Total Comprehensive Income (Loss) |  |  | 306.2 | 39.5 | 72.8 |
Foreign Currency Translation Adjustments Attributable to Noncontrolling Interests |  |  | 0.3 | 0.2 | (0.1) |
Issuance of Noncontrolling Interest in e-AAM |  |  |  |  | 12.0 |
Change in Noncontrolling Interest related to acquisition of noncontrolling interest |  |  | (5.2) |  | 0.1 |
2008 GM Agreement, Shares Issued to GM through Exercise of Warrants |  |  |  | 3.3 |  |
Common Stock [Member] |  |  |  |  |  |
Common Stock, Shares Outstanding | 74.8 | 73.8 | 74.8 | 73.8 | 68.8 | 68.4
Common Stock, Par Value | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8
Stock Issued During Period, Exercise of stock options and vesting of restricted stock |  |  | 1.5 | 1.7 | 0.5 |
Treasury Stock, Shares, Acquired |  |  | (0.5) | 0 | (0.1) |
Additional Paid-in Capital [Member] |  |  |  |  |  |
Paid in Capital | 600.9 | 597.2 | 600.9 | 597.2 | 588.1 | 579.9
Change in additional paid in capital for purchase of noncontrolling interest |  |  | 1.2 |  | (2.1) |
Change in additional paid in capital for exercise of stock options and vesting of restricted stock |  |  | 0.1 | 4.6 | 1.1 |
Adjustments to Additional Paid in Capital, Stock Based Compensation |  |  | 2.4 | 4.5 | 9.2 |
Retained Earnings [Member] |  |  |  |  |  |
Accumulated Deficit | (275.8) | (643.5) | (275.8) | (643.5) | (786.3) | (901.7)
Net income attributable to AAM |  |  | 367.7 | 142.8 | 115.4 |
Treasury Stock [Member] |  |  |  |  |  |
Treasury Stock | (182.1) | (176.2) | (182.1) | (176.2) | (176.1) | (174.8)
Treasury Stock, Value, Acquired, Cost Method |  |  | (5.9) | (0.1) | (1.3) |
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) | (264.6) | (203.8) | (264.6) | (203.8) | (106.0) | (64.4)
Other Comprehensive Income (Loss), Change in Derivatives, net Attributable to AAM |  |  | 7.8 | (6.8) | 1.3 |
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Attributable to AAM |  |  | (9.7) | (27.5) | 7.4 |
Other Comprehensive Income (Loss), Defined Benefit Plans, Net Attributable to AAM |  |  | $ (58.9) | $ (63.5) | $ (50.3) |

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