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Goodwill and Other Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2023
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, 2023:
Consolidated
(in millions)
Balance at December 31, 2022$181.6 
Foreign currency translation(0.6)
Balance at September 30, 2023$181.0 
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:
September 30,December 31,
20232022
Gross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
(in millions)
Capitalized computer software$53.4 $(47.7)$5.7 $52.2 $(43.2)$9.0 
Customer platforms856.2 (412.3)443.9 856.2 (364.7)491.5 
Customer relationships53.0 (22.2)30.8 53.0 (19.7)33.3 
Technology and other153.9 (81.0)72.9 154.1 (71.7)82.4 
Total$1,116.5 $(563.2)$553.3 $1,115.5 $(499.3)$616.2