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Goodwill and Other Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 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 nine months ended September 30, 2025:
Consolidated
(in millions)
Balance at December 31, 2024$172.0 
Foreign currency translation2.5 
Balance at September 30, 2025$174.5 
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:
September 30,December 31,
20252024
Gross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
(in millions)
Capitalized computer software$61.1 $(55.0)$6.1 $60.9 $(52.6)$8.3 
Customer platforms856.2 (539.1)317.1 856.2 (491.6)364.6 
Customer relationships53.0 (29.1)23.9 53.0 (26.5)26.5 
Technology and other149.5 (101.1)48.4 153.8 (96.5)57.3 
Total$1,119.8 $(724.3)$395.5 $1,123.9 $(667.2)$456.7