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Goodwill and Other Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2023
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, 2023:
Consolidated
(in millions)
Balance at December 31, 2022$181.6 
Foreign currency translation0.1 
Balance at March 31, 2023$181.7 
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,
20232022
Gross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
(in millions)
Capitalized computer software$52.4 $(44.6)$7.8 $52.2 $(43.2)$9.0 
Customer platforms856.2 (380.6)475.6 856.2 (364.7)491.5 
Customer relationships53.0 (20.5)32.5 53.0 (19.7)33.3 
Technology and other154.1 (74.9)79.2 154.1 (71.7)82.4 
Total$1,115.7 $(520.6)$595.1 $1,115.5 $(499.3)$616.2