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Goodwill and Other Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 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 six months ended June 30, 2024:
Consolidated
(in millions)
Balance at December 31, 2023$182.1 
Foreign currency translation(0.9)
Balance at June 30, 2024$181.2 
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:
June 30,December 31,
20242023
Gross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
(in millions)
Capitalized computer software$54.5 $(50.8)$3.7 $54.2 $(49.2)$5.0 
Customer platforms856.2 (459.9)396.3 856.2 (428.2)428.0 
Customer relationships53.0 (24.8)28.2 53.0 (23.1)29.9 
Technology and other154.0 (90.4)63.6 154.3 (84.4)69.9 
Total$1,117.7 $(625.9)$491.8 $1,117.7 $(584.9)$532.8