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Goodwill and Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2019
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, 2019:
 
Driveline
 
Metal Forming
 
Powertrain
 
Casting
 
Consolidated
 
(in millions)
Balance as of December 31, 2018
$
212.1

 
$
552.4

 
$
377.3

 
$
—

 
$
1,141.8

Reorganization
187.2

 
190.1

 
(377.3
)
 
—

 
—

Foreign currency translation
(0.8
)
 
(2.7
)
 
—

 
—

 
(3.5
)
Balance as of March 31, 2019
$
398.5

 
$
739.8

 
$
—

 
$
—

 
$
1,138.3
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:
 
March 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
$
40.6

 
$
(22.9
)
 
$
17.7

 
$
38.0

 
$
(20.1
)
 
$
17.9

Customer platforms
952.2

 
(141.1
)
 
811.1

 
952.2

 
(123.5
)
 
828.7

Customer relationships
147.0

 
(19.0
)
 
128.0

 
147.0

 
(16.5
)
 
130.5

Technology and other
156.0

 
(25.3
)
 
130.7

 
156.2

 
(22.2
)
 
134.0

Total
$
1,295.8

 
$
(208.3
)
 
$
1,087.5

 
$
1,293.4

 
$
(182.3
)
 
$
1,111.1


Amortization expense for our intangible assets was $25.0 million for the three months ended March 31, 2019, and $24.9 million for the three months ended March 31, 2018. Estimated amortization expense for each of the full years 2019 through 2023 is approximately $100 million.