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Schedule of Goodwill and Finite Lived Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2022
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, 2022 and the year ended December 31, 2021:
Consolidated
(in millions)
Balance as of January 1, 2021$185.7 
Foreign currency translation(1.9)
Balance as of December 31, 2021$183.8 
Foreign currency translation(2.2)
Balance as of December 31, 2022$181.6 
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, 2022 and December 31, 2021:
December 31,December 31,
20222021
Gross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
(in millions)
Capitalized computer software$52.2 $(43.2)$9.0 $47.3 $(37.0)$10.3 
Customer platforms856.2 (364.7)491.5 856.2 (301.3)554.9 
Customer relationships53.0 (19.7)33.3 53.0 (16.2)36.8 
Technology and other154.1 (71.7)82.4 156.1 (60.9)95.2 
Total$1,115.5 $(499.3)$616.2 $1,112.6 $(415.4)$697.2