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Earnings Per Share Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2014
Earnings (Loss) per Share (EPS) [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
| 2014 |  | 2013 |  | 2012
| (in millions, except per share data)
Numerator |  |  |  |  |
Net income attributable to AAM | $ | 143.0 |  |  | $ | 94.5 |  |  | $ | 367.7 |
Less: Net income attributable to participating securities | (2.9 | ) |  | (1.9 | ) |  | (2.6 | )
Net income attributable to common shareholders - Basic | $ | 140.1 |  |  | $ | 92.6 |  |  | $ | 365.1 |
Undistributed earnings reallocated to common shareholders under two step dilutive method | — |  |  | — |  |  | — |
Net income attributable to common shareholders - Dilutive | $ | 140.1 |  |  | $ | 92.6 |  |  | $ | 365.1 |
Denominators |  |  |  |  |
Basic common shares outstanding - |  |  |  |  |
Weighted-average shares outstanding | 77.3 |  |  | 76.7 |  |  | 75.3 |
Less: Participating securities | (1.6 | ) |  | (1.5 | ) |  | (0.5 | )
Weighted-average common shares outstanding | 75.7 |  |  | 75.2 |  |  | 74.8 |
Effect of dilutive securities - |  |  |  |  |
Dilutive stock-based compensation | 0.2 |  |  | 0.1 |  |  | 0.1 |
Diluted shares outstanding - |  |  |  |  |
Adjusted weighted-average shares after assumed conversions | 75.9 |  |  | 75.3 |  |  | 74.9 |
Basic EPS | $ | 1.85 |  |  | $ | 1.23 |  |  | $ | 4.88 |
Diluted EPS | $ | 1.85 |  |  | $ | 1.23 |  |  | $ | 4.87 |

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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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