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Earnings Per Share (Notes)
 6 Months Ended
Jun. 30, 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 EndedSix Months Ended
 June 30,June 30,
 2021202020212020
 (in millions, except per share data)
Numerator  
Net income (loss) attributable to AAM$16.0 $(213.2)$54.6 $(714.5)
    Less: Net income attributable to participating securities(0.6)— (2.2)— 
Net income (loss) attributable to common shareholders - Basic and Dilutive$15.4 $(213.2)$52.4 $(714.5)
Denominators  
Basic common shares outstanding -  
   Weighted-average shares outstanding118.7 118.4 118.5 117.4 
        Less: Participating securities(4.7)(5.3)(4.7)(4.5)
    Weighted-average common shares outstanding114.0 113.1 113.8 112.9 
Effect of dilutive securities -  
   Dilutive stock-based compensation0.4 — 0.2 — 
 
Diluted shares outstanding -  
   Adjusted weighted-average shares after assumed conversions114.4 113.1 114.0 112.9 
   
Basic EPS$0.13 $(1.88)$0.46 $(6.33)
   
Diluted EPS$0.13 $(1.88)$0.46 $(6.33)