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Goodwill and Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill [Table Text Block] The following table provides a reconciliation of changes in goodwill for the three months ended March 31, 2022:
Consolidated
(in millions)
Balance at December 31, 2021$183.8 
Foreign currency translation(0.6)
Balance at March 31, 2022$183.2 
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,
20222021
Gross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
(in millions)
Capitalized computer software$48.1 $(38.6)$9.5 $47.3 $(37.0)$10.3 
Customer platforms856.2 (317.2)539.0 856.2 (301.3)554.9 
Customer relationships53.0 (17.1)35.9 53.0 (16.2)36.8 
Technology and other155.9 (63.9)92.0 156.1 (60.9)95.2 
Total$1,113.2 $(436.8)$676.4 $1,112.6 $(415.4)$697.2