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Earnings Per Share (EPS)
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Earnings Per Share [Text Block]
12. 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 nonforfeitable 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):
 
2019
 
2018
 
2017
 
(in millions, except per share data)
Numerator
 
 
 
 
 
Net income (loss) attributable to AAM
$
(484.5
)
 
$
(57.5
)
 
$
337.1

Less: Net income allocated to participating securities
—

 
—

 
(7.5
)
Net income (loss) attributable to common shareholders - Basic and Dilutive
$
(484.5
)
 
$
(57.5
)
 
$
329.6

 
 
 
 
 
 
Denominators
 
 
 
 
 
Basic common shares outstanding -
 
 
 
 
 
Weighted-average shares outstanding
115.6

 
115.0

 
104.6

Less: Participating securities
(3.3
)
 
(3.4
)
 
(2.3
)
Weighted-average common shares outstanding
112.3

 
111.6

 
102.3

 
 
 
 
 
 
Effect of dilutive securities -
 
 
 
 
 
Dilutive stock-based compensation
—

 
—

 
0.5

 
 
 
 
 
 
Diluted shares outstanding -
 
 
 
 
 
Adjusted weighted-average shares after assumed conversions
112.3

 
111.6

 
102.8

 
 
 
 
 
 
Basic EPS
$
(4.31
)
 
$
(0.51
)
 
$
3.22

 
 
 
 
 
 
Diluted EPS
$
(4.31
)
 
$
(0.51
)
 
$
3.21



Basic and diluted loss per share are the same in 2019 and 2018 because the effect of 0.4 million dilutive performance shares in 2019, and the effect of 0.8 million dilutive stock options and performance shares in 2018, would have been antidilutive.