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Goodwill and Intangible Assets (Tables)
9 Months Ended
Sep. 30, 2021
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, 2021:
Consolidated
(in millions)
Balance at December 31, 2020$185.7 
Foreign currency translation(1.6)
Balance at September 30, 2021$184.1 
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,
20212020
Gross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
(in millions)
Capitalized computer software$48.9 $(38.2)$10.7 $47.6 $(33.9)$13.7 
Customer platforms856.2 (285.4)570.8 856.2 (237.9)618.3 
Customer relationships53.0 (15.4)37.6 53.0 (12.8)40.2 
Technology and other156.3 (57.7)98.6 156.7 (48.2)108.5 
Total$1,114.4 $(396.7)$717.7 $1,113.5 $(332.8)$780.7