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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2012
Earnings (Loss) per Share (EPS) [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
 
 
Three Months Ended
 
Six Months Ended
 
 
June 30,
 
June 30,
 
 
2012
 
2011
 
2012
 
2011
 
 
(in millions, except per share data)
Numerator
 
 
 
 
 
 
 
 
Net income attributable to AAM
 
$
4.7

 
$
49.2

 
$
55.9

 
$
86.9

 
 
 

 
 

 
 

 
 

Denominator
 
 

 
 

 
 

 
 

Basic shares outstanding -
 
 

 
 

 
 

 
 

   Weighted-average shares outstanding
 
75.1

 
75.4

 
75.1

 
74.5

 
 
 

 
 

 
 

 
 

Effect of dilutive securities
 
 

 
 

 
 

 
 

   Dilutive stock-based compensation
 
—

 
—

 
—

 
0.2

   Dilutive GM warrants
 
—

 
—

 
—

 
0.7

 
 
 

 
 

 
 

 
 

Diluted shares outstanding -
 
 

 
 

 
 

 
 

   Adjusted weighted-average shares after assumed conversions
 
75.1

 
75.4

 
75.1

 
75.4

 
 
 

 
 

 
 

 
 

Basic EPS
 
$
0.06

 
$
0.65

 
$
0.74

 
$
1.17

 
 
 

 
 

 
 

 
 

Diluted EPS
 
$
0.06

 
$
0.65

 
$
0.74

 
$
1.15