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Goodwill and Other Intangible Assets (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2023:
Consolidated
(in millions)
Balance at December 31, 2022$181.6 
Foreign currency translation0.1 
Balance at June 30, 2023$181.7 
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:
June 30,December 31,
20232022
Gross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
(in millions)
Capitalized computer software$52.9 $(46.2)$6.7 $52.2 $(43.2)$9.0 
Customer platforms856.2 (396.4)459.8 856.2 (364.7)491.5 
Customer relationships53.0 (21.4)31.6 53.0 (19.7)33.3 
Technology and other154.0 (77.9)76.1 154.1 (71.7)82.4 
Total$1,116.1 $(541.9)$574.2 $1,115.5 $(499.3)$616.2