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Goodwill and Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 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 six months ended June 30, 2022:
Consolidated
(in millions)
Balance at December 31, 2021$183.8 
Foreign currency translation(2.4)
Balance at June 30, 2022$181.4 
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:
June 30,December 31,
20222021
Gross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
(in millions)
Capitalized computer software$50.9 $(40.8)$10.1 $47.3 $(37.0)$10.3 
Customer platforms856.2 (333.0)523.2 856.2 (301.3)554.9 
Customer relationships53.0 (18.0)35.0 53.0 (16.2)36.8 
Technology and other154.2 (65.5)88.7 156.1 (60.9)95.2 
Total$1,114.3 $(457.3)$657.0 $1,112.6 $(415.4)$697.2