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Unaudited Quarterly Financial Data
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Information [Text Block]
15.    UNAUDITED QUARTERLY FINANCIAL DATA

 
Three Months Ended,
 
 
March 31
 
June 30
 
September 30
 
December 31
 
 
(in millions, except per share data)
 
2017
 
 
 
 
 
 
 
 
Net sales
$
1,049.9

 
$
1,757.8

 
$
1,724.4

 
$
1,733.9

 
Gross profit
210.7

 
316.4

 
297.7

 
294.3

 
Net income
78.4

 
66.3

 
86.3

 
106.5

 
Net income attributable to AAM
78.4

 
66.2

 
86.2

 
106.3

 
Basic EPS (1)
$
1.00

 
$
0.59

 
$
0.76

 
$
0.93

 
Diluted EPS (1)
$
0.99

 
$
0.59

 
$
0.75

 
$
0.93

 
 
 
 
 
 
 
 
 
 
2016
 
 
 
 
 
 
 
 
Net sales
$
969.2

 
$
1,025.4

 
$
1,006.9

 
$
946.5

 
Gross profit
174.0

 
191.4

 
181.2

 
179.5

(2) 
Net income
61.1

 
71.0

 
61.7

 
46.9

 
Net income attributable to AAM
61.1

 
71.0

 
61.7

 
46.9

 
Basic EPS (1)
$
0.78

 
$
0.91

 
$
0.79

 
$
0.60

 
Diluted EPS (1)
$
0.78

 
$
0.90

 
$
0.78

 
$
0.59

 
 
 
 
 
 
 
 
 
 


(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.

(2) In the third quarter of 2016, we identified an indicator of impairment at our Pantnagar Manufacturing Facility in India due to changes in forecasted cash flows and, as a result, recorded an impairment charge of $3.4 million to write the assets down to fair value. This impairment charge was recorded to Cost of Goods Sold in the third quarter of 2016 but has been reclassified to Restructuring and Acquisition-Related Costs in the Consolidated Statement of Income for the full year 2016. This reclassification occurred in the fourth quarter of 2016 as a result of the announced closure of the facility.