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Earnings Per Share (EPS)
 12 Months Ended
Dec. 31, 2022
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):
202220212020
(in millions, except per share data)
Numerator
Net income (loss) attributable to AAM$64.3 $5.9 $(561.3)
Less: Net income allocated to participating securities(2.7)(0.2)— 
Net income (loss) attributable to common shareholders - Basic and Dilutive$61.6 $5.7 $(561.3)
Denominators
Basic common shares outstanding -
Weighted-average shares outstanding119.4 118.5 117.9 
Less: Weighted-average participating securities(4.9)(4.6)(4.8)
Weighted-average common shares outstanding114.5 113.9 113.1 
Effect of dilutive securities -
Dilutive stock-based compensation1.0 0.2 — 
Diluted shares outstanding -
Adjusted weighted-average shares after assumed conversions115.5 114.1 113.1 
Basic EPS$0.54 $0.05 $(4.96)
Diluted EPS$0.53 $0.05 $(4.96)
Basic and diluted loss per share are the same in 2020 because the effect of potentially dilutive stock-based compensation would have been antidilutive. Excluded potentially dilutive shares were zero in 2020.