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Earnings Per Share Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2013
Earnings (Loss) per Share (EPS) [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
| 2013 |  | 2012 |  | 2011
| (in millions, except per share data)
Numerator |  |  |  |  |
Net income attributable to AAM | $ | 94.5 |  |  | $ | 367.7 |  |  | $ | 142.8 |
Denominators |  |  |  |  |
Basic shares outstanding - |  |  |  |  |
Weighted-average shares outstanding | 76.7 |  |  | 75.3 |  |  | 74.9 |
Effect of dilutive securities - |  |  |  |  |
Dilutive stock options | 0.1 |  |  | 0.1 |  |  | 0.1 |
Dilutive warrants | — |  |  | — |  |  | 0.4 |
Diluted shares outstanding - |  |  |  |  |
Adjusted weighted-average shares after assumed conversions | 76.8 |  |  | 75.4 |  |  | 75.4 |
Basic EPS | $ | 1.23 |  |  | $ | 4.88 |  |  | $ | 1.91 |
Diluted EPS | $ | 1.23 |  |  | $ | 4.87 |  |  | $ | 1.89 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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