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Goodwill and Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill [Table Text Block]
Goodwill The following table provides a reconciliation of changes in goodwill for the nine months ended September 30, 2018:

 
Driveline
 
Metal Forming
 
Powertrain
 
Casting
 
Consolidated
 
(in millions)
Balance as of December 31, 2017
$
211.1

 
$
558.9

 
$
478.8

 
$
405.5

 
$
1,654.3

Acquisition of MPG
—

 
0.9

 
—

 
—

 
0.9

Acquisition of USM Mexico
1.3

 
—

 
—

 
—

 
1.3

Sale of business
—

 
—

 
(15.1
)
 
—

 
(15.1
)
Foreign currency translation
(0.3
)
 
(5.6
)
 
(2.5
)
 
—

 
(8.4
)
Balance as of September 30, 2018
$
212.1

 
$
554.2

 
$
461.2

 
$
405.5

 
$
1,633.0
Schedule of Finite-Lived Intangible Assets [Table Text Block]
The following table provides a reconciliation of the gross carrying amount and associated accumulated amortization for AAM's total intangible assets, which are all subject to amortization:
 
September 30,
 
December 31,
 
2018
 
2017
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
(in millions)
Capitalized computer software
$
37.4

 
$
(18.6
)
 
$
18.8

 
$
35.6

 
$
(14.3
)
 
$
21.3

e-AAM in-process research and development
5.4

 
(0.6
)
 
4.8

 
5.9

 
—

 
5.9

Customer platforms
952.2

 
(105.8
)
 
846.4

 
952.2

 
(52.9
)
 
899.3

Customer relationships
147.0

 
(14.2
)
 
132.8

 
151.8

 
(7.3
)
 
144.5

Technology and other
150.8

 
(18.4
)
 
132.4

 
150.8

 
(9.3
)
 
141.5

Total
$
1,292.8

 
$
(157.6
)
 
$
1,135.2

 
$
1,296.3

 
$
(83.8
)
 
$
1,212.5


As a result of the acquisition of MPG in 2017, we recorded intangible assets related to aftermarket customer relationships that were associated with the Powertrain aftermarket business that we sold in the second quarter of 2018. As such, during the second quarter we reduced the gross carrying amount of our customer relationships by $4.8 million, and reduced the associated accumulated amortization by $0.3 million.

Amortization expense for our intangible assets was $24.8 million and $74.5 million for the three and nine months ended September 30, 2018 respectively, and $24.4 million and $50.8 million for the three and nine months ended September 30, 2017, respectively. Estimated amortization expense for each of the years 2018 through 2022 is approximately $100 million.