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Segment and Geographic Information (Tables) | 12 Months Ended
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Dec. 31, 2024
Segments, Geographical Areas [Abstract] |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
|  | Year Ended December 31, 2024
|  | Driveline |  | Metal Forming |  |  |  |  |  | Corporate and Eliminations |  | Total
|  | (in millions)
Sales |  | $ | 4,253.3 |  |  | $ | 2,414.3 |  |  |  |  |  |  | $ | — |  |  | $ | 6,667.6 |
Less: Intersegment sales |  | 1.4 |  |  | 541.3 |  |  |  |  |  |  | — |  |  | 542.7 |
Net external sales |  | $ | 4,251.9 |  |  | $ | 1,873.0 |  |  |  |  |  |  | $ | — |  |  | $ | 6,124.9 |
Cost of goods sold (a) |  | 3,392.8 |  |  | 1,623.8 |  |  |  |  |  |  | — |  |  | 5,016.6 |
Selling, general and administrative expenses (b) |  | 287.9 |  |  | 79.3 |  |  |  |  |  |  | — |  |  | 367.2 |
Other segment expense (income), net (c) |  | (7.0) |  |  | (1.1) |  |  |  |  |  |  | — |  |  | (8.1) |
Segment adjusted EBITDA |  | $ | 578.2 |  |  | $ | 171.0 |  |  |  |  |  |  | $ | — |  |  | $ | 749.2 |
Depreciation and amortization |  | $ | 246.5 |  |  | $ | 223.2 |  |  |  |  |  |  | $ | — |  |  | $ | 469.7 |
Capital expenditures |  | $ | 140.3 |  |  | $ | 103.5 |  |  |  |  |  |  | $ | 4.2 |  |  | $ | 248.0 |
Total assets |  | $ | 2,420.6 |  |  | $ | 1,636.8 |  |  |  |  |  |  | $ | 1,002.5 |  |  | $ | 5,059.9 |
(a) Cost of goods sold excludes depreciation and amortization, which was $210.2 million for Driveline and $156.7 million for Metal Forming for the year ended December 31, 2024.
(b) Selling, general and administrative expenses excludes depreciation, which was $16.4 million for Driveline and $3.5 million for Metal Forming for the year ended December 31, 2024.
(c) Other segment expense (income), net primarily consists of the net impact of interest income and foreign exchange gains and losses.
|  | Year Ended December 31, 2023
|  | Driveline |  | Metal Forming |  |  |  |  |  | Corporate and Eliminations |  | Total
Sales |  | $ | 4,176.7 |  |  | $ | 2,454.3 |  |  |  |  |  |  | $ | — |  |  | $ | 6,631.0 |
Less: Intersegment sales |  | 0.2 |  |  | 551.3 |  |  |  |  |  |  | — |  |  | 551.5 |
Net external sales |  | $ | 4,176.5 |  |  | $ | 1,903.0 |  |  |  |  |  |  | $ | — |  |  | $ | 6,079.5 |
Cost of goods sold (a) |  | 3,396.1 |  |  | 1,676.9 |  |  |  |  |  |  | — |  |  | 5,073.0 |
Selling, general and administrative expenses (b) |  | 263.2 |  |  | 84.1 |  |  |  |  |  |  | — |  |  | 347.3 |
Other segment expense (income), net (c) |  | (26.4) |  |  | (7.7) |  |  |  |  |  |  | — |  |  | (34.1) |
Segment adjusted EBITDA |  | $ | 543.6 |  |  | $ | 149.7 |  |  |  |  |  |  | $ | — |  |  | $ | 693.3 |
Depreciation and amortization |  | $ | 260.3 |  |  | $ | 226.9 |  |  |  |  |  |  | $ | — |  |  | $ | 487.2 |
Capital expenditures |  | $ | 105.9 |  |  | $ | 80.1 |  |  |  |  |  |  | $ | 8.6 |  |  | $ | 194.6 |
Total assets |  | $ | 2,554.3 |  |  | $ | 1,788.7 |  |  |  |  |  |  | $ | 1,013.3 |  |  | $ | 5,356.3 |
(a) Cost of goods sold excludes depreciation and amortization, which was $222.7 million for Driveline and $159.5 million for Metal Forming for the year ended December 31, 2023.
(b) Selling, general and administrative expenses excludes depreciation, which was $16.0 million for Driveline and $3.6 million for Metal Forming for the year ended December 31, 2023.
(c) Other segment expense (income), net primarily consists of the net impact of interest income and foreign exchange gains and losses.
|  | Year Ended December 31, 2022
|  | Driveline |  | Metal Forming |  |  |  |  |  | Corporate and Eliminations |  | Total
Sales |  | $ | 4,063.5 |  |  | $ | 2,280.7 |  |  |  |  |  |  | $ | — |  |  | $ | 6,344.2 |
Less: Intersegment sales |  | — |  |  | 541.8 |  |  |  |  |  |  | — |  |  | 541.8 |
Net external sales |  | $ | 4,063.5 |  |  | $ | 1,738.9 |  |  |  |  |  |  | $ | — |  |  | $ | 5,802.4 |
Cost of goods sold (a) |  | 3,305.0 |  |  | 1,404.4 |  |  |  |  |  |  | — |  |  | 4,709.4 |
Selling, general and administrative expenses (b) |  | 256.4 |  |  | 70.2 |  |  |  |  |  |  | — |  |  | 326.6 |
Other segment expense (income), net (c) |  | (8.8) |  |  | 27.9 |  |  |  |  |  |  | — |  |  | 19.1 |
Segment adjusted EBITDA |  | $ | 510.9 |  |  | $ | 236.4 |  |  |  |  |  |  | $ | — |  |  | $ | 747.3 |
Depreciation and amortization |  | $ | 272.7 |  |  | $ | 219.4 |  |  |  |  |  |  | $ | — |  |  | $ | 492.1 |
Capital expenditures |  | $ | 103.3 |  |  | $ | 62.9 |  |  |  |  |  |  | $ | 5.2 |  |  | $ | 171.4 |
Total assets |  | $ | 2,542.0 |  |  | $ | 1,900.3 |  |  |  |  |  |  | $ | 1,027.1 |  |  | $ | 5,469.4 |
(a) Cost of goods sold excludes depreciation and amortization, which was $232.0 million for Driveline and $156.1 million for Metal Forming for the year ended December 31, 2022.
(b) Selling, general and administrative expenses excludes depreciation, which was $14.8 million for Driveline and $3.7 million for Metal Forming for the year ended December 31, 2022.
(c) Other segment expense (income), net primarily consists of the net impact of interest income and foreign exchange gains and losses, as well as amounts related to the Malvern Fire and Tekfor acquisition.
Assets included in the Corporate and Eliminations column of the tables above represent AAM corporate assets, as well as eliminations of intercompany assets.
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] | The following table represents a reconciliation of Segment Adjusted EBITDA to consolidated income (loss) before income taxes for the years ended December 31, 2024, 2023 and 2022:
|  | Year Ended December 31,
|  | 2024 |  | 2023 |  | 2022
|  | (in millions)
Segment adjusted EBITDA |  | $ | 749.2 |  |  | $ | 693.3 |  |  | $ | 747.3 |
Interest expense |  | (186.0) |  |  | (201.7) |  |  | (174.5) |
Depreciation and amortization |  | (469.7) |  |  | (487.2) |  |  | (492.1) |
Impairment charge |  | (12.0) |  |  | — |  |  | — |
Restructuring and acquisition-related costs |  | (18.0) |  |  | (25.2) |  |  | (30.2) |
Pension curtailment and settlement charges |  | — |  |  | (1.3) |  |  | — |
Loss on equity securities |  | (0.1) |  |  | (1.1) |  |  | (25.5) |
Debt refinancing and redemption costs |  | (0.6) |  |  | (1.3) |  |  | (6.4) |
Malvern Fire insurance recoveries, net of charges |  | — |  |  | — |  |  | 39.1 |
Acquisition-related fair value inventory adjustment |  | — |  |  | — |  |  | (5.0) |
Gain on bargain purchase of business |  | — |  |  | — |  |  | 13.6 |
Income (loss) before income taxes |  | $ | 62.8 |  |  | $ | (24.5) |  |  | $ | 66.3 |
Schedule of Disclosure on Geographic Areas, Revenue and Long-Lived Assets by Country [Table Text Block] | Financial information relating to our operations by geographic area is presented in the following table. Net sales are attributed to countries based upon location of production. Long-lived assets exclude deferred income taxes.
| December 31,
| 2024 |  | 2023 |  | 2022
| (in millions)
Net sales |  |  |  |  |
United States | $ | 2,195.5 |  |  | $ | 2,163.5 |  |  | $ | 2,148.0 |
Mexico | 2,249.3 |  |  | 2,273.5 |  |  | 2,293.2 |
South America | 171.5 |  |  | 184.4 |  |  | 137.4 |
China | 328.8 |  |  | 271.6 |  |  | 280.0 |
All other Asia | 283.0 |  |  | 273.1 |  |  | 213.3 |
Europe | 896.8 |  |  | 913.4 |  |  | 730.5 |
Total net sales | $ | 6,124.9 |  |  | $ | 6,079.5 |  |  | $ | 5,802.4 |
Long-lived assets |  |  |  |  |
United States | $ | 1,621.8 |  |  | $ | 1,694.3 |  |  | $ | 1,778.9 |
Mexico | 739.8 |  |  | 778.4 |  |  | 821.3 |
South America | 59.8 |  |  | 75.8 |  |  | 71.2 |
China | 92.1 |  |  | 110.9 |  |  | 130.1 |
All other Asia | 50.2 |  |  | 79.2 |  |  | 80.5 |
Europe | 381.9 |  |  | 441.7 |  |  | 475.0 |
Total long-lived assets | $ | 2,945.6 |  |  | $ | 3,180.3 |  |  | $ | 3,357.0 |

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- Definition Tabular disclosure of information concerning material long-lived assets (excluding financial instruments, customer relationships with financial institutions, mortgage and other servicing rights, deferred policy acquisition costs, and deferred taxes assets) located in identified geographic areas and/or the amount of revenue from external customers attributed to that country from which revenue is material. An entity may also provide subtotals of geographic information about groups of countries. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-41 + Details
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