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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2020
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 |  |
|  |  |  |  |  | March 31, |  |
|  |  |  |  |  | 2020 |  | 2019
|  |  |  |  |  | (in millions, except per share data) |  |
Numerator |  |  |  |  |  |  |  |
Net income (loss) attributable to AAM |  |  |  |  |  | $ | (501.3) |  |  | $ | 41.6 |
Less: Net income attributable to participating securities |  |  |  |  |  | — |  |  | (1.2) |
Net income (loss) attributable to common shareholders - Basic and Dilutive |  |  |  |  |  | $ | (501.3) |  |  | $ | 40.4 |
Denominators |  |  |  |  |  |  |  |
Basic common shares outstanding - |  |  |  |  |  |  |  |
Weighted-average shares outstanding |  |  |  |  |  | 116.4 |  |  | 115.3 |
Less: Participating securities |  |  |  |  |  | (3.7) |  |  | (3.4) |
Weighted-average common shares outstanding |  |  |  |  |  | 112.7 |  |  | 111.9 |
Effect of dilutive securities - |  |  |  |  |  |  |  |
Dilutive stock-based compensation |  |  |  |  |  | — |  |  | 0.5 |
Diluted shares outstanding - |  |  |  |  |  |  |  |
Adjusted weighted-average shares after assumed conversions |  |  |  |  |  | 112.7 |  |  | 112.4 |
Basic EPS |  |  |  |  |  | $ | (4.45) |  |  | $ | 0.36 |
Diluted EPS |  |  |  |  |  | $ | (4.45) |  |  | $ | 0.36 |

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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