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Goodwill and Intangible Assets Schedule of Finite Lived Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
The following table provides a reconciliation of changes in the carrying value of our in-process research and development intangible assets:
 
December 31,
 
2017
 
2016
 
(in millions)
Beginning balance
$
5.3

 
$
5.7

Foreign currency translation
0.6

 
(0.4
)
Ending balance
$
5.9

 
$
5.3

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, as of December 31, 2017 and December 31, 2016:
 
December 31,
 
December 31,
 
2017
 
2016
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
(in millions)
Capitalized computer software
$
35.6

 
$
(14.3
)
 
$
21.3

 
$
31.7

 
$
(8.5
)
 
$
23.2

Customer platforms
952.2

 
(52.9
)
 
899.3

 
—

 
—

 
—

Customer relationships
151.8

 
(7.3
)
 
144.5

 
—

 
—

 
—

Technology and other
150.8

 
(9.3
)
 
141.5

 
—

 
—

 
—

Total
$
1,290.4

 
$
(83.8
)
 
$
1,206.6

 
$
31.7

 
$
(8.5
)
 
$
23.2