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Goodwill and Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 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 three months ended March 31, 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

Foreign currency translation
(0.2
)
 
4.7

 
8.1

 
—

 
12.6

Balance as of March 31, 2018
$
212.2

 
$
564.5

 
$
486.9

 
$
405.5

 
$
1,669.1
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:
 
March 31,
 
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
$
36.8

 
$
(15.7
)
 
$
21.1

 
$
35.6

 
$
(14.3
)
 
$
21.3

e-AAM in-process research and development
5.8

 
(0.2
)
 
5.6

 
5.9

 
—

 
5.9

Customer platforms
952.2

 
(70.5
)
 
881.7

 
952.2

 
(52.9
)
 
899.3

Customer relationships
151.8

 
(9.9
)
 
141.9

 
151.8

 
(7.3
)
 
144.5

Technology and other
150.8

 
(12.3
)
 
138.5

 
150.8

 
(9.3
)
 
141.5

Total
$
1,297.4

 
$
(108.6
)
 
$
1,188.8

 
$
1,296.3

 
$
(83.8
)
 
$
1,212.5


Amortization expense for these intangible assets was $24.9 million for the three months ended March 31, 2018, and $1.6 million for the three months ended March 31, 2017. Estimated amortization expense for each of the years 2018 through 2022 is approximately $100 million.