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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2012
Earnings (Loss) per Share (EPS) [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
| 2012 |  | 2011 |  | 2010
| (in millions, except per share data)
Numerator |  |  |  |  |
Net income attributable to AAM | $ | 367.7 |  |  | $ | 142.8 |  |  | $ | 115.4 |
Denominators |  |  |  |  |
Basic shares outstanding - |  |  |  |  |
Weighted-average shares outstanding | 75.3 |  |  | 74.9 |  |  | 71.5 |
Effect of dilutive securities - |  |  |  |  |
Dilutive stock options | 0.1 |  |  | 0.1 |  |  | 0.1 |
Dilutive warrants | — |  |  | 0.4 |  |  | 2.9 |
Diluted shares outstanding - |  |  |  |  |
Adjusted weighted-average shares after assumed conversions | 75.4 |  |  | 75.4 |  |  | 74.5 |
Basic EPS | $ | 4.88 |  |  | $ | 1.91 |  |  | $ | 1.61 |
Diluted EPS | $ | 4.87 |  |  | $ | 1.89 |  |  | $ | 1.55 |

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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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