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Schedule of Goodwill and Finite Lived Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2021
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, 2021 and the year ended December 31, 2020:
DrivelineMetal FormingConsolidated
(in millions)
Balance as of January 1, 2020$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 
Foreign currency translation(1.9)— (1.9)
Balance as of December 31, 2021$183.8 $— $183.8 
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, 2021 and December 31, 2020:
December 31,December 31,
20212020
Gross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
(in millions)
Capitalized computer software$47.3 $(37.0)$10.3 $47.6 $(33.9)$13.7 
Customer platforms856.2 (301.3)554.9 856.2 (237.9)618.3 
Customer relationships53.0 (16.2)36.8 53.0 (12.8)40.2 
Technology and other156.1 (60.9)95.2 156.7 (48.2)108.5 
Total$1,112.6 $(415.4)$697.2 $1,113.5 $(332.8)$780.7