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Earnings Per Share (EPS) | 12 Months Ended
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Dec. 31, 2021
Earnings Per Share [Abstract] |
Earnings Per Share [Text Block] | 10. 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 are our 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):
| 2021 |  | 2020 |  | 2019
| (in millions, except per share data)
Numerator |  |  |  |  |
Net income (loss) attributable to AAM | $ | 5.9 |  |  | $ | (561.3) |  |  | $ | (484.5) |
Less: Net income allocated to participating securities | (0.2) |  |  | — |  |  | — |
Net income (loss) attributable to common shareholders - Basic and Dilutive | $ | 5.7 |  |  | $ | (561.3) |  |  | $ | (484.5) |
Denominators |  |  |  |  |
Basic common shares outstanding - |  |  |  |  |
Weighted-average shares outstanding | 118.5 |  |  | 117.9 |  |  | 115.6 |
Less: Weighted-average participating securities | (4.6) |  |  | (4.8) |  |  | (3.3) |
Weighted-average common shares outstanding | 113.9 |  |  | 113.1 |  |  | 112.3 |
Effect of dilutive securities - |  |  |  |  |
Dilutive stock-based compensation | 0.2 |  |  | — |  |  | — |
Diluted shares outstanding - |  |  |  |  |
Adjusted weighted-average shares after assumed conversions | 114.1 |  |  | 113.1 |  |  | 112.3 |
Basic EPS | $ | 0.05 |  |  | $ | (4.96) |  |  | $ | (4.31) |
Diluted EPS | $ | 0.05 |  |  | $ | (4.96) |  |  | $ | (4.31) |
Basic and diluted loss per share are the same in 2020 and 2019 because the effect of potentially dilutive stock-based compensation would have been antidilutive. Excluded potentially dilutive shares were zero in 2020 and were 0.4 million in 2019.

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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=124432515&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=124432515&loc=d3e3630-109257 + Details
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