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Earnings Per Share (Notes) | 3 Months Ended
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Mar. 31, 2021
Earnings Per Share [Abstract] |
Earnings Per Share [Text Block] | 11. EARNINGS (LOSS) PER SHARE (EPS) We present EPS using the two-class method. This method allocates undistributed earnings between common shares and non-vested share based payment awards that entitle the holder to non-forfeitable dividend rights. Our participating securities include non-vested restricted stock units. 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,
|  |  |  |  |  | 2021 |  | 2020
|  |  |  |  |  | (in millions, except per share data)
Numerator |  |  |  |  |  |  |  |
Net income (loss) attributable to AAM |  |  |  |  |  | $ | 38.6 |  |  | $ | (501.3) |
Less: Net income attributable to participating securities |  |  |  |  |  | (1.6) |  |  | — |
Net income (loss) attributable to common shareholders - Basic and Dilutive |  |  |  |  |  | $ | 37.0 |  |  | $ | (501.3) |
Denominators |  |  |  |  |  |  |  |
Basic common shares outstanding - |  |  |  |  |  |  |  |
Weighted-average shares outstanding |  |  |  |  |  | 118.3 |  |  | 116.4 |
Less: Participating securities |  |  |  |  |  | (4.8) |  |  | (3.7) |
Weighted-average common shares outstanding |  |  |  |  |  | 113.5 |  |  | 112.7 |
Effect of dilutive securities - |  |  |  |  |  |  |  |
Dilutive stock-based compensation |  |  |  |  |  | — |  |  | — |
Diluted shares outstanding - |  |  |  |  |  |  |  |
Adjusted weighted-average shares after assumed conversions |  |  |  |  |  | 113.5 |  |  | 112.7 |
Basic EPS |  |  |  |  |  | $ | 0.33 |  |  | $ | (4.45) |
Diluted EPS |  |  |  |  |  | $ | 0.33 |  |  | $ | (4.45) |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109243012&loc=SL65017193-207537 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3630-109257 + Details
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