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Goodwill and Other Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2025
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, 2025:
Consolidated
(in millions)
Balance at December 31, 2024$172.0 
Foreign currency translation0.8 
Balance at March 31, 2025$172.8 
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,
20252024
Gross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
(in millions)
Capitalized computer software$61.0 $(53.5)$7.5 $60.9 $(52.6)$8.3 
Customer platforms856.2 (507.4)348.8 856.2 (491.6)364.6 
Customer relationships53.0 (27.4)25.6 53.0 (26.5)26.5 
Technology and other149.5 (95.2)54.3 153.8 (96.5)57.3 
Total$1,119.7 $(683.5)$436.2 $1,123.9 $(667.2)$456.7