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Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2025 | Jun. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax |  | $ (157.9) |  | $ (157.7) | $ (147.1) |  | $ (146.5) | $ (157.9) |  | $ (147.1) |  | $ (157.2) | $ (145.3)
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax |  | (109.7) |  | (138.9) | (150.3) |  | (171.9) | (109.7) |  | (150.3) |  | (187.0) | (142.3)
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax |  | 6.1 |  | 3.0 | (11.7) |  | 16.5 | 6.1 |  | (11.7) |  | $ (8.0) | $ 24.7
Accumulated other comprehensive income (loss), net of tax - Beginning balance |  | (293.6) |  |  | (301.9) |  |  | (352.2) |  | (262.9) |  |  |
Other comprehensive income (loss) arising during period, total |  | 3.2 |  |  | (17.4) |  |  | 30.0 |  | (36.0) |  |  |
Other Comprehensive Income (Loss) before Reclassifications, Tax |  | (1.4) |  |  | 8.3 |  |  | 1.7 |  | 5.9 |  |  |
Other comprehensive income (loss), reclassification before tax |  | 29.8 |  |  | 3.3 |  |  | 65.1 |  | (17.3) |  |  |
Reclassification from AOCI, Current Period, Tax |  | 0.5 |  |  | (1.4) |  |  | (6.1) |  | 1.2 |  |  |
Defined benefit plans, net current period other comprehensive income (loss) | [1] | (0.2) |  |  | (0.6) |  |  | (0.7) |  | (1.8) |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax |  | 29.2 |  |  | 21.6 |  |  | 77.3 |  | (8.0) |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax | [2] | 3.1 |  |  | (28.2) |  |  | 14.1 |  | (36.4) |  |  |
Other comprehensive income (loss) |  | 32.1 |  |  | (7.2) |  |  | 90.7 |  | (46.2) |  |  |
Accumulated other comprehensive income (loss), net of tax - Ending balance |  | (261.5) |  | $ (293.6) | (309.1) |  | $ (301.9) | (261.5) |  | (309.1) |  |  |
Cost of Sales [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax |  | (1.6) |  |  | (2.0) |  |  | 4.4 |  | (12.4) |  |  |
Interest Expense [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax |  | (0.1) |  |  | (1.2) |  |  | (1.5) |  | (2.6) |  |  |
Other Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax |  | (0.9) |  |  | 7.4 |  |  | 24.1 |  | 0.4 |  |  |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax |  | 0.0 |  |  | 0.0 |  |  | 0.0 |  | 0.0 |  |  |
Income tax effect of other comprehensive income (loss) before reclassifications |  | 0.0 |  |  | 0.0 |  |  | 0.0 |  | 0.0 |  |  |
Defined benefit plans, amounts reclassified from accumulated other comprehensive income (loss) |  | (0.4) | [3] |  | (0.9) | [3] |  | (1.1) | [4] | (2.7) | [4] |  |
Income taxes reclassified into net income |  | 0.2 |  |  | 0.3 |  |  | 0.4 |  | 0.9 |  |  |
Defined benefit plans, net current period other comprehensive income (loss) |  | (0.2) |  |  | (0.6) |  |  | (0.7) |  | (1.8) |  |  |
Accumulated Foreign Currency Adjustment Attributable to Parent |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustments, other comprehensive income (loss) arising during period |  | (3.6) |  |  | 21.6 |  |  | 38.1 |  | (8.0) |  |  |
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax |  | 0.0 |  |  | 0.0 |  |  | 0.0 |  | 0.0 |  |  |
Foreign currency translation adjustments, amounts reclassified from accumulated other comprehensive income (loss) |  | 32.8 | [5] |  | 0.0 |  |  | 39.2 | [6] | 0.0 |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Tax |  | 0.0 |  |  | 0.0 |  |  | 0.0 |  | 0.0 |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax |  | 29.2 |  |  | 21.6 |  |  | 77.3 |  | (8.0) |  |  |
Accumulated Foreign Currency Adjustment Attributable to Parent | Hefei AAM Automotive Driveline & Chassis System Co., Ltd. and Liuzhou AAM Automotive Driveline System Co., Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustments, amounts reclassified from accumulated other comprehensive income (loss) | [6] |  |  |  |  |  |  | 6.4 |  |  |  |  |
Accumulated Foreign Currency Adjustment Attributable to Parent | AAM India Manufacturing Corporation Pvt., Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustments, amounts reclassified from accumulated other comprehensive income (loss) | [6] |  |  |  |  |  |  | 32.8 |  |  |  |  |
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax |  | 6.8 |  |  | (39.0) |  |  | (8.1) |  | (28.0) |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax |  | (1.4) |  |  | 8.3 |  |  | 1.7 |  | 5.9 |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax |  | (2.6) | [7] |  | 4.2 | [7] |  | 27.0 | [8] | (14.6) | [8] |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax |  | 0.3 |  |  | (1.7) |  |  | (6.5) |  | 0.3 |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax |  | $ 3.1 |  |  | $ (28.2) |  |  | $ 14.1 |  | $ (36.4) |  |  |
[1] | Amounts are net of tax of $0.2 million and $0.4 million for the three and nine months ended September 30, 2025 and $0.3 million and $0.9 million for the three and nine months ended September 30, 2024.
[2] | Amounts are net of tax of $(1.1) million and $(4.8) million for the three and nine months ended September 30, 2025 and $6.6 million and $6.2 million for the three and nine months ended September 30, 2024.
[3] | These amounts were reclassified from AOCI to Other income (expense), net for the three months ended September 30, 2025 and September 30, 2024.
[4] | These amounts were reclassified from AOCI to Other income (expense), net for the nine months ended September 30, 2025 and September 30, 2024.
[5] | The amount reclassified from AOCI for the three months ended September 30, 2025 reflects the cumulative translation adjustment associated with the sale of AAM India Manufacturing Corporation Pvt., Ltd. that was completed in the third quarter of 2025. See Note 2 - Acquisitions and Dispositions for further details.
[6] | The amount reclassified from AOCI for the nine months ended September 30, 2025 included $6.4 million for AAM's 50% share of the cumulative translation adjustment associated with the two Chinese joint ventures that we exited in the first quarter of 2025 and $32.8 million for the cumulative translation adjustment associated with the sale of AAM India Manufacturing Corporation Pvt., Ltd. that was completed in the third quarter of 2025. See Note 2 - Acquisitions and Dispositions for further details.
[7] | The amounts reclassified from AOCI included $(1.6) million in cost of goods sold (COGS), $(0.1) million in interest expense and $(0.9) million in Other income (expense), net for the three months ended September 30, 2025 and $(2.0) million in COGS, $(1.2) million in interest expense and $7.4 million in Other income (expense), net for the three months ended September 30, 2024.
[8] | The amounts reclassified from AOCI included $4.4 million in COGS, $(1.5) million in interest expense and $24.1 million in Other income (expense), net for the nine months ended September 30, 2025 and $(12.4) million in COGS, $(2.6) million in interest expense and $0.4 million in Other income (expense), net for the nine months ended September 30, 2024.

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