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Earnings Per Share (EPS)
 12 Months Ended
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):
202120202019
(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 outstanding118.5 117.9 115.6 
Less: Weighted-average participating securities(4.6)(4.8)(3.3)
Weighted-average common shares outstanding113.9 113.1 112.3 
Effect of dilutive securities -
Dilutive stock-based compensation0.2 — — 
Diluted shares outstanding -
Adjusted weighted-average shares after assumed conversions114.1 113.1 112.3 
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.