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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2012
Earnings (Loss) per Share (EPS) [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three Months Ended |  | Nine Months Ended
|  | September 30, |  | September 30,
|  | 2012 |  | 2011 |  | 2012 |  | 2011
|  | (in millions, except per share data)
Numerator |  |  |  |  |  |  |  |
Net income (loss) attributable to AAM |  | $ | (8.1 | ) |  | $ | 24.8 |  |  | $ | 47.8 |  |  | $ | 111.7 |
Denominator |  |  |  |  |  |  |  |  |  |  |  |
Basic shares outstanding - |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average shares outstanding |  | 74.9 |  |  | 75.4 |  |  | 75.2 |  |  | 74.8 |
Effect of dilutive securities |  |  |  |  |  |  |  |  |  |  |  |
Dilutive stock-based compensation |  | — |  |  | — |  |  | — |  |  | 0.1 |
Dilutive GM warrants |  | — |  |  | — |  |  | — |  |  | 0.5 |
Diluted shares outstanding - |  |  |  |  |  |  |  |  |  |  |  |
Adjusted weighted-average shares after assumed conversions |  | 74.9 |  |  | 75.4 |  |  | 75.2 |  |  | 75.4 |
Basic EPS |  | $ | (0.11 | ) |  | $ | 0.33 |  |  | $ | 0.64 |  |  | $ | 1.49 |
Diluted EPS |  | $ | (0.11 | ) |  | $ | 0.33 |  |  | $ | 0.63 |  |  | $ | 1.48 |

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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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