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Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2021
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
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,
 20212020
 (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 outstanding118.3 116.4 
        Less: Participating securities(4.8)(3.7)
    Weighted-average common shares outstanding113.5 112.7 
Effect of dilutive securities -
   Dilutive stock-based compensation — 
 
Diluted shares outstanding -
   Adjusted weighted-average shares after assumed conversions113.5 112.7 
 
Basic EPS$0.33 $(4.45)
 
Diluted EPS$0.33 $(4.45)