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Schedule of Finite Lived Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets [Abstract]  
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, 2019 and December 31, 2018:
 
December 31,
 
December 31,
 
2019
 
2018
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
(in millions)
Capitalized computer software
$
45.8

 
$
(27.6
)
 
$
18.2

 
$
38.0

 
$
(20.1
)
 
$
17.9

Customer platforms
856.2

 
(174.4
)
 
681.8

 
952.2

 
(123.5
)
 
828.7

Customer relationships
53.0

 
(9.4
)
 
43.6

 
147.0

 
(16.5
)
 
130.5

Technology and other
156.0

 
(35.1
)
 
120.9

 
156.2

 
(22.2
)
 
134.0

Total
$
1,111.0

 
$
(246.5
)
 
$
864.5

 
$
1,293.4

 
$
(182.3
)
 
$
1,111.1