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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 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 |  |  |  | Six Months Ended |  |
|  | June 30, |  |  |  | June 30, |  |
|  | 2020 |  | 2019 |  | 2020 |  | 2019
|  | (in millions, except per share data) |  |  |  |  |  |
Numerator |  |  |  |  |  |  |  |
Net income (loss) attributable to AAM |  | $ | (213.2) |  |  | $ | 52.5 |  |  | $ | (714.5) |  |  | $ | 94.1 |
Less: Net income attributable to participating securities |  | — |  |  | (1.5) |  |  | — |  |  | (2.7) |
Net income (loss) attributable to common shareholders - Basic and Dilutive |  | $ | (213.2) |  |  | $ | 51.0 |  |  | $ | (714.5) |  |  | $ | 91.4 |
Denominators |  |  |  |  |  |  |  |
Basic common shares outstanding - |  |  |  |  |  |  |  |
Weighted-average shares outstanding |  | 118.4 |  |  | 115.8 |  |  | 117.4 |  |  | 115.6 |
Less: Participating securities |  | (5.3) |  |  | (3.3) |  |  | (4.5) |  |  | (3.4) |
Weighted-average common shares outstanding |  | 113.1 |  |  | 112.5 |  |  | 112.9 |  |  | 112.2 |
Effect of dilutive securities - |  |  |  |  |  |  |  |
Dilutive stock-based compensation |  | — |  |  | 0.3 |  |  | — |  |  | 0.4 |
Diluted shares outstanding - |  |  |  |  |  |  |  |
Adjusted weighted-average shares after assumed conversions |  | 113.1 |  |  | 112.8 |  |  | 112.9 |  |  | 112.6 |
Basic EPS |  | $ | (1.88) |  |  | $ | 0.45 |  |  | $ | (6.33) |  |  | $ | 0.81 |
Diluted EPS |  | $ | (1.88) |  |  | $ | 0.45 |  |  | $ | (6.33) |  |  | $ | 0.81 |

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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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