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Unaudited Quarterly Financial Data
 12 Months Ended
Dec. 31, 2013
Unaudited Quarterly Financial Data [Abstract]  
Quarterly Financial Information [Text Block]
13. UNAUDITED QUARTERLY FINANCIAL DATA

 
Three Months Ended,
 
March 31
 
June 30
 
September 30
 
December 31
 
(in millions, except per share data)
2013
 
 
 
 
 
 
 
Net sales
$
755.6

 
$
799.6

 
$
820.8

 
$
831.3

Gross profit
104.3

 
122.2

 
125.3

 
126.9

Net income
7.3

 
25.8

 
31.6

 
29.8

Net income attributable to AAM
7.3

 
25.8

 
31.6

 
29.8

Basic EPS (1)
$
0.10

 
$
0.34

 
$
0.41

 
$
0.39

Diluted EPS (1)
$
0.10

 
$
0.34

 
$
0.41

 
$
0.39

 
 
 
 
 
 
 
 
2012
 
 
 
 
 
 
 
Net sales
$
751.5

 
$
739.8

 
$
702.9

 
$
736.7

Gross profit
139.2

 
85.8

 
90.7

 
84.0

Net income (loss)
50.3

 
4.7

 
(8.2
)
 
319.9

Net income (loss) attributable to AAM
51.2

 
4.7

 
(8.1
)
 
319.9

Basic EPS (1)
$
0.68

 
$
0.06

 
$
(0.11
)
 
$
4.21

Diluted EPS (1)
$
0.68

 
$
0.06

 
$
(0.11
)
 
$
4.21

 
 
 
 
 
 
 
 


(1) Full year basic and diluted EPS will not necessarily agree to the sum of the four quarters because each quarter is a separate calculation.