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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2013
Earnings (Loss) per Share (EPS) [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:
 
 
 
Three Months Ended
 
 
March 31,
 
 
2013
 
2012
 
 
(in millions, except per share data)
Numerator
 
 
 
 
Net income attributable to AAM
 
$
7.3

 
$
51.2

 
 
 

 
 

Denominator
 
 

 
 

Basic shares outstanding -
 
 

 
 

   Weighted-average shares outstanding
 
76.2

 
75.0

 
 
 

 
 

Effect of dilutive securities
 
 

 
 

   Dilutive stock-based compensation
 
—

 
—

 
 
 

 
 

Diluted shares outstanding -
 
 

 
 

   Adjusted weighted-average shares after assumed conversions
 
76.2

 
75.0

 
 
 

 
 

Basic EPS
 
$
0.10

 
$
0.68

 
 
 

 
 

Diluted EPS
 
$
0.10

 
$
0.68