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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2012
Earnings (Loss) per Share (EPS) [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three Months Ended |  | Six Months Ended
|  | June 30, |  | June 30,
|  | 2012 |  | 2011 |  | 2012 |  | 2011
|  | (in millions, except per share data)
Numerator |  |  |  |  |  |  |  |
Net income attributable to AAM |  | $ | 4.7 |  |  | $ | 49.2 |  |  | $ | 55.9 |  |  | $ | 86.9 |
Denominator |  |  |  |  |  |  |  |  |  |  |  |
Basic shares outstanding - |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average shares outstanding |  | 75.1 |  |  | 75.4 |  |  | 75.1 |  |  | 74.5 |
Effect of dilutive securities |  |  |  |  |  |  |  |  |  |  |  |
Dilutive stock-based compensation |  | — |  |  | — |  |  | — |  |  | 0.2 |
Dilutive GM warrants |  | — |  |  | — |  |  | — |  |  | 0.7 |
Diluted shares outstanding - |  |  |  |  |  |  |  |  |  |  |  |
Adjusted weighted-average shares after assumed conversions |  | 75.1 |  |  | 75.4 |  |  | 75.1 |  |  | 75.4 |
Basic EPS |  | $ | 0.06 |  |  | $ | 0.65 |  |  | $ | 0.74 |  |  | $ | 1.17 |
Diluted EPS |  | $ | 0.06 |  |  | $ | 0.65 |  |  | $ | 0.74 |  |  | $ | 1.15 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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