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Schedule of Finite Lived Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]  
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, as of December 31, 2018 and December 31, 2017:
 
December 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
$
38.0

 
$
(20.1
)
 
$
17.9

 
$
35.6

 
$
(14.3
)
 
$
21.3

Customer platforms
952.2

 
(123.5
)
 
828.7

 
952.2

 
(52.9
)
 
899.3

Customer relationships
147.0

 
(16.5
)
 
130.5

 
151.8

 
(7.3
)
 
144.5

Technology and other
156.2

 
(22.2
)
 
134.0

 
150.8

 
(9.3
)
 
141.5

Total
$
1,293.4

 
$
(182.3
)
 
$
1,111.1

 
$
1,290.4

 
$
(83.8
)
 
$
1,206.6