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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 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 |  | Nine Months Ended
|  | September 30, |  | September 30,
|  | 2020 |  | 2019 |  | 2020 |  | 2019
|  | (in millions, except per share data)
Numerator |  |  |  |  |  |  |  |
Net income (loss) attributable to AAM |  | $ | 117.2 |  |  | $ | (124.2) |  |  | $ | (597.3) |  |  | $ | (30.1) |
Less: Net income attributable to participating securities |  | (5.1) |  |  | — |  |  | — |  |  | — |
Net income (loss) attributable to common shareholders - Basic and Dilutive |  | $ | 112.1 |  |  | $ | (124.2) |  |  | $ | (597.3) |  |  | $ | (30.1) |
Denominators |  |  |  |  |  |  |  |
Basic common shares outstanding - |  |  |  |  |  |  |  |
Weighted-average shares outstanding |  | 118.4 |  |  | 115.8 |  |  | 117.7 |  |  | 115.6 |
Less: Participating securities |  | (5.1) |  |  | (3.3) |  |  | (4.7) |  |  | (3.3) |
Weighted-average common shares outstanding |  | 113.3 |  |  | 112.5 |  |  | 113.0 |  |  | 112.3 |
Effect of dilutive securities - |  |  |  |  |  |  |  |
Dilutive stock-based compensation |  | — |  |  | — |  |  | — |  |  | — |
Diluted shares outstanding - |  |  |  |  |  |  |  |
Adjusted weighted-average shares after assumed conversions |  | 113.3 |  |  | 112.5 |  |  | 113.0 |  |  | 112.3 |
Basic EPS |  | $ | 0.99 |  |  | $ | (1.10) |  |  | $ | (5.28) |  |  | $ | (0.27) |
Diluted EPS |  | $ | 0.99 |  |  | $ | (1.10) |  |  | $ | (5.28) |  |  | $ | (0.27) |

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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://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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