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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2012
Earnings (Loss) per Share (EPS) [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
 
 
Three Months Ended
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
 
2012
 
2011
 
2012
 
2011
 
 
(in millions, except per share data)
Numerator
 
 
 
 
 
 
 
 
Net income (loss) attributable to AAM
 
$
(8.1
)
 
$
24.8

 
$
47.8

 
$
111.7

 
 
 

 
 

 
 

 
 

Denominator
 
 

 
 

 
 

 
 

Basic shares outstanding -
 
 

 
 

 
 

 
 

   Weighted-average shares outstanding
 
74.9

 
75.4

 
75.2

 
74.8

 
 
 

 
 

 
 

 
 

Effect of dilutive securities
 
 

 
 

 
 

 
 

   Dilutive stock-based compensation
 
—

 
—

 
—

 
0.1

   Dilutive GM warrants
 
—

 
—

 
—

 
0.5

 
 
 

 
 

 
 

 
 

Diluted shares outstanding -
 
 

 
 

 
 

 
 

   Adjusted weighted-average shares after assumed conversions
 
74.9

 
75.4

 
75.2

 
75.4

 
 
 

 
 

 
 

 
 

Basic EPS
 
$
(0.11
)
 
$
0.33

 
$
0.64

 
$
1.49

 
 
 

 
 

 
 

 
 

Diluted EPS
 
$
(0.11
)
 
$
0.33

 
$
0.63

 
$
1.48