Organization and Basis of Presentation (Policies)	6 Months Ended
Jun. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Accounting, Policy [Policy Text Block]	Basis of Presentation We have prepared the accompanying interim condensed consolidated financial statements in accordance with the instructions to Form 10-Q under the Securities Exchange Act of 1934. These condensed consolidated financial statements are unaudited but include all normal recurring adjustments, which we consider necessary for a fair presentation of the information set forth herein. Results of operations for the periods presented are not necessarily indicative of the results for the full fiscal year. The balance sheet at December 31, 2024 presented herein has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by accounting principles generally accepted in the United States of America (GAAP) for complete consolidated financial statements. In order to prepare the accompanying interim condensed consolidated financial statements, we are required to make estimates and assumptions that affect the reported amounts and disclosures in our interim condensed consolidated financial statements. These estimates and assumptions are impacted by risks and uncertainties, including those associated with tariffs and the significant instability in U.S. trade relations with certain non-U.S. countries. While we have made estimates and assumptions based on the facts and circumstances as of the date of this report, the full impact of tariffs and potential changes in U.S. trade relations cannot be predicted, and actual results could differ materially from those estimates and assumptions. For further information, refer to the audited consolidated financial statements and notes included in our Annual Report on Form 10-K for the year ended December 31, 2024.
New Accounting Pronouncements, Policy [Policy Text Block]	Effect of New Accounting Standards Standards Recently Adopted Accounting Standards Update 2023-07 On November 27, 2023, the Financial Accounting Standards Board (FASB) issued Accounting Standard Update (ASU) 2023-07 - Improvements to Reportable Segment Disclosures (Topic 280). ASU 2023-07 enhances existing annual segment requirements to include disclosure of significant segment expenses and other segment items by reportable segment that are regularly used by the Chief Operating Decision Maker (CODM) to evaluate segment performance. This guidance also requires annual disclosure of the title and position of the CODM. ASU 2023-07 also expands interim segment disclosure requirements to include all existing annual segment disclosures in addition to the new disclosure requirements for significant segment expenses and other segment items. We adopted this guidance retrospectively on January 1, 2024 for the annual requirements and on January 1, 2025 for the interim requirements. See Note 15 - Segment Reporting for our updated interim segment disclosures. Accounting Standards Update 2023-09 On December 14, 2023, the FASB issued ASU 2023-09 - Improvements to Income Tax Disclosures (Topic 740). ASU 2023-09 expands the existing disclosure requirements for the annual rate reconciliation between the effective tax rate and the statutory federal tax rate by requiring reconciliation items to be disaggregated by defined categories and disclosed as both percentages and amounts. ASU 2023-09 also requires the disaggregation of income taxes paid by jurisdiction for each annual period presented. This guidance became effective at the beginning of our 2025 fiscal year and may be applied either retrospectively or prospectively. We adopted this guidance on January 1, 2025 and the adoption of this guidance will result in modifications to AAM's income tax disclosures to adhere to the new requirements, but is not expected to otherwise have a significant impact on our consolidated financial statements. Standards Not Yet Adopted Accounting Standards Update 2024-03 On November 4, 2024, the FASB issued ASU 2024-03 - Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40). ASU 2024-03 expands existing annual and interim requirements for costs and expenses to include a footnote disclosure disaggregating expense captions on the face of the income statement by specific expense categories using a tabular presentation. ASU 2024-03 also requires a qualitative disclosure of the amounts remaining in relevant expense captions that are not separately disclosed as part of the specific expense categories, as well as disclosures about the entity's total selling expenses and in annual periods, a definition of selling expenses. This guidance becomes effective at the beginning of our 2027 fiscal year for annual requirements, and at the beginning of our 2028 fiscal year for interim requirements, using either a prospective or retrospective transition method. We expect to adopt this guidance on January 1, 2027 for the annual requirements and on January 1, 2028 for the interim requirements. We are currently assessing the impact that this standard will have on our consolidated financial statements.

Organization and Basis of Presentation (Policies)

6 Months Ended

Jun. 30, 2025

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Accounting, Policy [Policy Text Block]

Basis of Presentation We have prepared the accompanying interim condensed consolidated financial statements in accordance with the instructions to Form 10-Q under the Securities Exchange Act of 1934. These condensed consolidated financial statements are unaudited but include all normal recurring adjustments, which we consider necessary for a fair presentation of the information set forth herein. Results of operations for the periods presented are not necessarily indicative of the results for the full fiscal year.

The balance sheet at December 31, 2024 presented herein has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by accounting principles generally accepted in the United States of America (GAAP) for complete consolidated financial statements.

In order to prepare the accompanying interim condensed consolidated financial statements, we are required to make estimates and assumptions that affect the reported amounts and disclosures in our interim condensed consolidated financial statements. These estimates and assumptions are impacted by risks and uncertainties, including those associated with tariffs and the significant instability in U.S. trade relations with certain non-U.S. countries. While we have made estimates and assumptions based on the facts and circumstances as of the date of this report, the full impact of tariffs and potential changes in U.S. trade relations cannot be predicted, and actual results could differ materially from those estimates and assumptions.

For further information, refer to the audited consolidated financial statements and notes included in our Annual Report on Form 10-K for the year ended December 31, 2024.

New Accounting Pronouncements, Policy [Policy Text Block]

Effect of New Accounting Standards

Standards Recently Adopted

Accounting Standards Update 2023-07

On November 27, 2023, the Financial Accounting Standards Board (FASB) issued Accounting Standard Update (ASU) 2023-07 - Improvements to Reportable Segment Disclosures (Topic 280). ASU 2023-07 enhances existing annual segment requirements to include disclosure of significant segment expenses and other segment items by reportable segment that are regularly used by the Chief Operating Decision Maker (CODM) to evaluate segment performance. This guidance also requires annual disclosure of the title and position of the CODM. ASU 2023-07 also expands interim segment disclosure requirements to include all existing annual segment disclosures in addition to the new disclosure requirements for significant segment expenses and other segment items. We adopted this guidance retrospectively on January 1, 2024 for the annual requirements and on January 1, 2025 for the interim requirements. See Note 15 - Segment Reporting for our updated interim segment disclosures.

Accounting Standards Update 2023-09

On December 14, 2023, the FASB issued ASU 2023-09 - Improvements to Income Tax Disclosures (Topic 740). ASU 2023-09 expands the existing disclosure requirements for the annual rate reconciliation between the effective tax rate and the statutory federal tax rate by requiring reconciliation items to be disaggregated by defined categories and disclosed as both percentages and amounts. ASU 2023-09 also requires the disaggregation of income taxes paid by jurisdiction for each annual period presented. This guidance became effective at the beginning of our 2025 fiscal year and may be applied either retrospectively or prospectively. We adopted this guidance on January 1, 2025 and the adoption of this guidance will result in modifications to AAM's income tax disclosures to adhere to the new requirements, but is not expected to otherwise have a significant impact on our consolidated financial statements.

Standards Not Yet Adopted

Accounting Standards Update 2024-03

On November 4, 2024, the FASB issued ASU 2024-03 - Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40). ASU 2024-03 expands existing annual and interim requirements for costs and expenses to include a footnote disclosure disaggregating expense captions on the face of the income statement by specific expense categories using a tabular presentation. ASU 2024-03 also requires a qualitative disclosure of the amounts remaining in relevant expense captions that are not separately disclosed as part of the specific expense categories, as well as disclosures about the entity's total selling expenses and in annual periods, a definition of selling expenses. This guidance becomes effective at the beginning of our 2027 fiscal year for annual requirements, and at the beginning of our 2028 fiscal year for interim requirements, using either a prospective or retrospective transition method. We expect to adopt this guidance on January 1, 2027 for the annual requirements and on January 1, 2028 for the interim requirements. We are currently assessing the impact that this standard will have on our consolidated financial statements.