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Earnings Per Share (EPS) (Tables) | 12 Months Ended
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Dec. 31, 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):
| 2018 |  | 2017 |  | 2016
| (in millions, except per share data)
Numerator |  |  |  |  |
Net income (loss) attributable to AAM | $ | (57.5 | ) |  | $ | 337.1 |  |  | $ | 240.7 |
Less: Net income allocated to participating securities | — |  |  | (7.5 | ) |  | (5.5 | )
Net income (loss) attributable to common shareholders - Basic and Dilutive | $ | (57.5 | ) |  | $ | 329.6 |  |  | $ | 235.2 |
Denominators |  |  |  |  |
Basic common shares outstanding - |  |  |  |  |
Weighted-average shares outstanding | 115.0 |  |  | 104.6 |  |  | 78.2 |
Less: Participating securities | (3.4 | ) |  | (2.3 | ) |  | (1.8 | )
Weighted-average common shares outstanding | 111.6 |  |  | 102.3 |  |  | 76.4 |
Effect of dilutive securities - |  |  |  |  |
Dilutive stock-based compensation | — |  |  | 0.5 |  |  | 0.5 |
Diluted shares outstanding - |  |  |  |  |
Adjusted weighted-average shares after assumed conversions | 111.6 |  |  | 102.8 |  |  | 76.9 |
Basic EPS | $ | (0.51 | ) |  | $ | 3.22 |  |  | $ | 3.08 |
Diluted EPS | $ | (0.51 | ) |  | $ | 3.21 |  |  | $ | 3.06 |
Basic and diluted loss per share are the same in 2018 because the effect of 0.8 million dilutive stock options and performance shares would have been antidilutive.

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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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