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Schedule of Goodwill and Finite Lived Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2023
Goodwill and Intangible Assets [Abstract]  
Schedule of Goodwill [Table Text Block] The following table provides a reconciliation of changes in goodwill for the year ended December 31, 2023 and the year ended December 31, 2022:
Consolidated
(in millions)
Balance as of January 1, 2022$183.8 
Foreign currency translation(2.2)
Balance as of December 31, 2022$181.6 
Foreign currency translation0.5 
Balance as of December 31, 2023$182.1 
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, as of December 31, 2023 and December 31, 2022:
December 31,December 31,
20232022
Gross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
(in millions)
Capitalized computer software$54.2 $(49.2)$5.0 $52.2 $(43.2)$9.0 
Customer platforms856.2 (428.2)428.0 856.2 (364.7)491.5 
Customer relationships53.0 (23.1)29.9 53.0 (19.7)33.3 
Technology and other154.3 (84.4)69.9 154.1 (71.7)82.4 
Total$1,117.7 $(584.9)$532.8 $1,115.5 $(499.3)$616.2