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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2019
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
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
 
2019
 
2018
 
2019
 
2018
 
 
(in millions, except per share data)
Numerator
 
 

 
 
 
 
 
 
Net income (loss) attributable to AAM
 
$
(124.2
)
 
$
63.8

 
$
(30.1
)
 
$
304.3

    Less: Net income attributable to participating securities
 
—

 
(2.0
)
 
—

 
(8.9
)
Net income (loss) attributable to common shareholders - Basic and Dilutive
 
$
(124.2
)
 
$
61.8

 
$
(30.1
)
 
$
295.4

 
 
 
 
 
 
 
 
 
Denominators
 
 

 
 

 
 
 
 
Basic common shares outstanding -
 
 

 
 

 
 
 
 
   Weighted-average shares outstanding
 
115.8

 
115.3

 
115.6

 
115.0

        Less: Participating securities
 
(3.3
)
 
(3.6
)
 
(3.3
)
 
(3.4
)
    Weighted-average common shares outstanding
 
112.5

 
111.7

 
112.3

 
111.6

 
 
 
 
 
 
 
 
 
Effect of dilutive securities -
 
 

 
 

 
 
 
 
   Dilutive stock-based compensation
 
—

 
1.0

 
—

 
0.7

 
 


 


 
 
 
 
Diluted shares outstanding -
 
 

 
 

 
 
 
 
   Adjusted weighted-average shares after assumed conversions
 
112.5

 
112.7

 
112.3

 
112.3

 
 
 

 
 

 
 
 
 
Basic EPS
 
$
(1.10
)
 
$
0.55

 
$
(0.27
)
 
$
2.65

 
 
 

 
 

 
 
 
 
Diluted EPS
 
$
(1.10
)
 
$
0.55

 
$
(0.27
)
 
$
2.63