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Earnings Per Share (EPS)
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Earnings Per Share [Text Block]
13.
EARNINGS PER SHARE (EPS)

We present earnings per share 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
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
 
2018
 
2017
 
2018
 
2017
 
 
(in millions, except per share data)
Numerator
 
 

 
 
 
 
 
 
Net income attributable to AAM
 
$
63.8

 
$
86.2

 
$
304.3

 
$
230.8

    Less: Net income attributable to participating securities
 
(2.0
)
 
(1.9
)
 
(8.9
)
 
(5.1
)
Net income attributable to common shareholders - Basic and Dilutive
 
$
61.8

 
$
84.3

 
$
295.4

 
$
225.7

 
 
 
 
 
 
 
 
 
Denominators
 
 

 
 

 
 
 
 
Basic common shares outstanding -
 
 

 
 

 
 
 
 
   Weighted-average shares outstanding
 
115.3

 
113.9

 
115.0

 
101.5

        Less: Participating securities
 
(3.6
)
 
(2.6
)
 
(3.4
)
 
(2.3
)
    Weighted-average common shares outstanding
 
111.7

 
111.3

 
111.6

 
99.2

 
 
 
 
 
 
 
 
 
Effect of dilutive securities -
 
 

 
 

 
 
 
 
   Dilutive stock-based compensation
 
1.0

 
0.4

 
0.7

 
0.4

 
 


 


 
 
 
 
Diluted shares outstanding -
 
 

 
 

 
 
 
 
   Adjusted weighted-average shares after assumed conversions
 
112.7

 
111.7

 
112.3

 
99.6

 
 
 

 
 

 
 
 
 
Basic EPS
 
$
0.55

 
$
0.76

 
$
2.65

 
$
2.28

 
 
 

 
 

 
 
 
 
Diluted EPS
 
$
0.55

 
$
0.75

 
$
2.63

 
$
2.27