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Goodwill and Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill [Table Text Block] The following table provides a reconciliation of changes in goodwill for the nine months ended September 30, 2019:
 
Driveline
 
Metal Forming
 
Powertrain
 
Casting
 
Consolidated
 
(in millions)
Balance at December 31, 2018
$
212.1

 
$
552.4

 
$
377.3

 
$
—

 
$
1,141.8

Reorganization
187.2

 
190.1

 
(377.3
)
 
—

 
—

Foreign currency translation
(5.4
)
 
(8.9
)
 
—

 
—

 
(14.3
)
Balance at September 30, 2019
$
393.9

 
$
733.6

 
$
—

 
$
—

 
$
1,127.5
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 other intangible assets, which are all subject to amortization:
 
September 30,
 
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
$
41.4

 
$
(26.0
)
 
$
15.4

 
$
38.0

 
$
(20.1
)
 
$
17.9

Customer platforms
856.2

 
(158.6
)
 
697.6

 
952.2

 
(123.5
)
 
828.7

Customer relationships
53.0

 
(8.5
)
 
44.5

 
147.0

 
(16.5
)
 
130.5

Technology and other
155.7

 
(31.7
)
 
124.0

 
156.2

 
(22.2
)
 
134.0

Total
$
1,106.3

 
$
(224.8
)
 
$
881.5

 
$
1,293.4

 
$
(182.3
)
 
$
1,111.1


Amortization expense for our intangible assets was $23.7 million and $73.6 million for the three and nine months ended September 30, 2019, respectively, and $24.8 million and $74.5 million for the three and nine months ended September 30, 2018, respectively. Estimated amortization expense for the full year 2019 is approximately $95 million and estimated amortization expense for each of the full years 2020 through 2023 is approximately $87 million.