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Earnings Per Share (Notes)
 3 Months Ended
Mar. 31, 2020
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 Ended
 March 31,
 20202019
 (in millions, except per share data)
Numerator
Net income (loss) attributable to AAM$(501.3) $41.6  
    Less: Net income attributable to participating securities—  (1.2) 
Net income (loss) attributable to common shareholders - Basic and Dilutive$(501.3) $40.4  
Denominators
Basic common shares outstanding -
   Weighted-average shares outstanding116.4  115.3  
        Less: Participating securities(3.7) (3.4) 
    Weighted-average common shares outstanding112.7  111.9  
Effect of dilutive securities -
   Dilutive stock-based compensation—  0.5  
 
Diluted shares outstanding -
   Adjusted weighted-average shares after assumed conversions112.7  112.4  
 
Basic EPS$(4.45) $0.36  
 
Diluted EPS$(4.45) $0.36