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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2012
Earnings (Loss) per Share (EPS) [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
 
2012
 
2011
 
2010
 
(in millions, except per share data)
Numerator
 
 
 
 
 
Net income attributable to AAM
$
367.7

 
$
142.8

 
$
115.4

 
 
 
 
 
 
Denominators
 
 
 
 
 
Basic shares outstanding -
 
 
 
 
 
Weighted-average shares outstanding
75.3

 
74.9

 
71.5

 
 
 
 
 
 
Effect of dilutive securities -
 
 
 
 
 
Dilutive stock options
0.1

 
0.1

 
0.1

Dilutive warrants
—

 
0.4

 
2.9

 
 
 
 
 
 
Diluted shares outstanding -
 
 
 
 
 
Adjusted weighted-average shares after assumed conversions
75.4

 
75.4

 
74.5

 
 
 
 
 
 
Basic EPS
$
4.88

 
$
1.91

 
$
1.61

 
 
 
 
 
 
Diluted EPS
$
4.87

 
$
1.89

 
$
1.55