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Schedule of Goodwill and Finite Lived Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2024
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, 2024 and the year ended December 31, 2023:
Consolidated
(in millions)
Balance as of January 1, 2023$181.6 
Foreign currency translation0.5 
Balance as of December 31, 2023$182.1 
Reclassification to Assets held-for-sale(8.3)
Foreign currency translation(1.8)
Balance as of December 31, 2024$172.0 
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, 2024 and December 31, 2023:
December 31,December 31,
20242023
Gross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
(in millions)
Capitalized computer software$60.9 $(52.6)$8.3 $54.2 $(49.2)$5.0 
Customer platforms856.2 (491.6)364.6 856.2 (428.2)428.0 
Customer relationships53.0 (26.5)26.5 53.0 (23.1)29.9 
Technology and other153.8 (96.5)57.3 154.3 (84.4)69.9 
Total$1,123.9 $(667.2)$456.7 $1,117.7 $(584.9)$532.8