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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2017
Earnings Per Share [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 available to shareholders of common stock (excluding participating securities):
|  | Three Months Ended |  | Nine Months Ended
|  | September 30, |  | September 30,
|  | 2017 |  | 2016 |  | 2017 |  | 2016
|  | (in millions, except per share data)
Numerator |  |  |  |  |  |  |  |
Net income attributable to AAM |  | $ | 86.2 |  |  | $ | 61.7 |  |  | $ | 230.8 |  |  | $ | 193.8 |
Less: Net income attributable to participating securities |  | (1.9 | ) |  | (1.4 | ) |  | (5.1 | ) |  | (4.4 | )
Net income attributable to common shareholders - Basic and Dilutive |  | $ | 84.3 |  |  | $ | 60.3 |  |  | $ | 225.7 |  |  | $ | 189.4 |
Denominators |  |  |  |  |  |  |  |  |  |
Basic common shares outstanding - |  |  |  |  |  |  |  |  |  |
Weighted-average shares outstanding |  | 113.9 |  |  | 78.3 |  |  | 101.5 |  |  | 78.2 |
Less: Participating securities |  | (2.6 | ) |  | (1.8 | ) |  | (2.3 | ) |  | (1.8 | )
Weighted-average common shares outstanding |  | 111.3 |  |  | 76.5 |  |  | 99.2 |  |  | 76.4 |
Effect of dilutive securities - |  |  |  |  |  |  |  |  |  |
Dilutive stock-based compensation |  | 0.4 |  |  | 0.5 |  |  | 0.4 |  |  | 0.4 |
Diluted shares outstanding - |  |  |  |  |  |  |  |  |  |
Adjusted weighted-average shares after assumed conversions |  | 111.7 |  |  | 77.0 |  |  | 99.6 |  |  | 76.8 |
Basic EPS |  | $ | 0.76 |  |  | $ | 0.79 |  |  | $ | 2.28 |  |  | $ | 2.48 |
Diluted EPS |  | $ | 0.75 |  |  | $ | 0.78 |  |  | $ | 2.27 |  |  | $ | 2.47 |
Certain exercisable stock options were excluded from the computations of diluted EPS because the exercise price of these options was greater than the average period market prices. There were no stock options excluded from the calculation of diluted EPS at September 30, 2017. The number of stock options outstanding, which were not included in the calculation of diluted EPS, was 0.2 million, with an exercise price of $26.02, at September 30, 2016.

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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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