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Schedule of Goodwill and Finite Lived Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets [Abstract]  
Schedule of Goodwill [Table Text Block]
Goodwill The following table provides a reconciliation of changes in goodwill for the year ended December 31, 2020 and the year ended December 31, 2019:

DrivelineMetal FormingPowertrainConsolidated
(in millions)
Balance as of January 1, 2019$212.1 $552.4 $377.3 $1,141.8 
Reorganization187.2 190.1 (377.3)— 
Impairment charge— (440.0)— (440.0)
Foreign currency translation(1.0)(1.7)— (2.7)
Balance as of December 31, 2019$398.3 $300.8 $— $699.1 
Impairment charge(210.8)(299.2)— (510.0)
Foreign currency translation(1.8)(1.6)— (3.4)
Balance as of December 31, 2020$185.7 $— $— $185.7 
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, as of December 31, 2020 and December 31, 2019:
December 31,December 31,
20202019
Gross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
(in millions)
Capitalized computer software$47.6 $(33.9)$13.7 $45.8 $(27.6)$18.2 
Customer platforms856.2 (237.9)618.3 856.2 (174.4)681.8 
Customer relationships53.0 (12.8)40.2 53.0 (9.4)43.6 
Technology and other156.7 (48.2)108.5 156.0 (35.1)120.9 
Total$1,113.5 $(332.8)$780.7 $1,111.0 $(246.5)$864.5