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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2018
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,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
|  | (in millions, except per share data)
Numerator |  |  |  |  |  |  |  |  |
Net income attributable to AAM |  | $ | 63.8 |  |  | $ | 86.2 |  |  | $ | 304.3 |  |  | $ | 230.8 |
Less: Net income attributable to participating securities |  | (2.0 | ) |  | (1.9 | ) |  | (8.9 | ) |  | (5.1 | )
Net income attributable to common shareholders - Basic and Dilutive |  | $ | 61.8 |  |  | $ | 84.3 |  |  | $ | 295.4 |  |  | $ | 225.7 |
Denominators |  |  |  |  |  |  |  |  |  |
Basic common shares outstanding - |  |  |  |  |  |  |  |  |  |
Weighted-average shares outstanding |  | 115.3 |  |  | 113.9 |  |  | 115.0 |  |  | 101.5 |
Less: Participating securities |  | (3.6 | ) |  | (2.6 | ) |  | (3.4 | ) |  | (2.3 | )
Weighted-average common shares outstanding |  | 111.7 |  |  | 111.3 |  |  | 111.6 |  |  | 99.2 |
Effect of dilutive securities - |  |  |  |  |  |  |  |  |  |
Dilutive stock-based compensation |  | 1.0 |  |  | 0.4 |  |  | 0.7 |  |  | 0.4 |
Diluted shares outstanding - |  |  |  |  |  |  |  |  |  |
Adjusted weighted-average shares after assumed conversions |  | 112.7 |  |  | 111.7 |  |  | 112.3 |  |  | 99.6 |
Basic EPS |  | $ | 0.55 |  |  | $ | 0.76 |  |  | $ | 2.65 |  |  | $ | 2.28 |
Diluted EPS |  | $ | 0.55 |  |  | $ | 0.75 |  |  | $ | 2.63 |  |  | $ | 2.27 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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