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Goodwill and Other Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2024
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, 2024:
Consolidated
(in millions)
Balance at December 31, 2023$182.1 
Foreign currency translation(0.7)
Balance at March 31, 2024$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:
March 31,December 31,
20242023
Gross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
(in millions)
Capitalized computer software$54.3 $(50.1)$4.2 $54.2 $(49.2)$5.0 
Customer platforms856.2 (444.0)412.2 856.2 (428.2)428.0 
Customer relationships53.0 (23.9)29.1 53.0 (23.1)29.9 
Technology and other154.0 (87.3)66.7 154.3 (84.4)69.9 
Total$1,117.5 $(605.3)$512.2 $1,117.7 $(584.9)$532.8