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Unaudited Quarterly Financial Data Unaudited Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2014
Unaudited Quarterly Financial Data [Abstract]  
Schedule of Quarterly Financial Information [Table Text Block]
 
Three Months Ended,
 
March 31
 
June 30
 
September 30
 
December 31
 
(in millions, except per share data)
2014
 
 
 
 
 
 
 
Net sales
$
858.8

 
$
946.9

 
$
950.8

 
$
939.5

Gross profit
121.9

 
149.0

 
140.7

 
111.2

Net income
33.6

 
52.2

 
44.0

 
13.2

Net income attributable to AAM
33.6

 
52.2

 
44.0

 
13.2

Basic EPS (1)
$
0.44

 
$
0.67

 
$
0.57

 
$
0.17

Diluted EPS (1)
$
0.44

 
$
0.67

 
$
0.57

 
$
0.17

 
 
 
 
 
 
 
 
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

 
 
 
 
 
 
 
 


(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.