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Unaudited Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [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)
 
2018
 
 
 
 
 
 
 
 
Net sales
$
1,858.4

 
$
1,900.9

 
$
1,817.0

 
$
1,694.1

 
Gross profit
316.3

 
331.4

 
267.4

 
225.3

 
Net income (loss)
89.5

 
151.3

 
64.0

 
(361.6
)
(2)
Net income (loss) attributable to AAM
89.4

 
151.1

 
63.8

 
(361.8
)
(2)
Basic EPS (1)
$
0.78

 
$
1.31

 
$
0.55

 
$
(3.24
)
(2)
Diluted EPS (1)
$
0.78

 
$
1.30

 
$
0.55

 
$
(3.24
)
(2)
 
 
 
 
 
 
 
 
 
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

 
 
 
 
 
 
 
 
 
 


(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 fourth quarter of 2018, we recorded a goodwill impairment charge of approximately $400 million, net of tax, associated with the annual goodwill impairment test for our Powertrain and Casting segments. See Note 5 - Goodwill and Other Intangible Assets for further detail.