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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2013
Earnings (Loss) per Share (EPS) [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The following table sets forth the computation of our basic and diluted EPS:
|  | Three Months Ended
|  | March 31,
|  | 2013 |  | 2012
|  | (in millions, except per share data)
Numerator |  |  |  |
Net income attributable to AAM |  | $ | 7.3 |  |  | $ | 51.2 |
Denominator |  |  |  |  |  |
Basic shares outstanding - |  |  |  |  |  |
Weighted-average shares outstanding |  | 76.2 |  |  | 75.0 |
Effect of dilutive securities |  |  |  |  |  |
Dilutive stock-based compensation |  | — |  |  | — |
Diluted shares outstanding - |  |  |  |  |  |
Adjusted weighted-average shares after assumed conversions |  | 76.2 |  |  | 75.0 |
Basic EPS |  | $ | 0.10 |  |  | $ | 0.68 |
Diluted EPS |  | $ | 0.10 |  |  | $ | 0.68 |

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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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