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Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 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 $ (157.5) $ (145.9) $ (157.2) $ (145.3)
Foreign currency translation adjustments (163.7) (157.6) (187.0) (142.3)
Unrecognized loss on hedges, net of tax (5.8) 35.5 $ (8.0) $ 24.7
Accumulated other comprehensive income (loss), net of tax - Beginning balance (352.2) (262.9)    
Other comprehensive income (loss) arising during period, total 8.9 8.5    
Other Comprehensive Income (Loss) before Reclassifications, Tax 1.7 (5.0)    
Other comprehensive income (loss), reclassification before tax 17.1 (10.9)    
Reclassification from AOCI, Current Period, Tax (2.5) 2.3    
Defined benefit plans, net current period other comprehensive income (loss) [1] (0.3) (0.6)    
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 23.3 (15.3)    
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax [2] 2.2 10.8    
Other comprehensive income (loss) 25.2 (5.1)    
Accumulated other comprehensive income (loss), net of tax - Ending balance (327.0) (268.0)    
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 4.1 (4.7)    
Interest Expense [Member]        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax (1.0) (0.3)    
Other Income [Member]        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax 8.0 (5.0)    
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    
Income tax effect of other comprehensive income (loss) before reclassifications 0.0 0.0    
Defined benefit plans, amounts reclassified from accumulated other comprehensive income (loss) [3] (0.4) (0.9)    
Income taxes reclassified into net income 0.1 0.3    
Defined benefit plans, net current period other comprehensive income (loss) (0.3) (0.6)    
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 16.9 (15.3)    
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax 0.0 0.0    
Foreign currency translation adjustments, amounts reclassified from accumulated other comprehensive income (loss) 6.4 [4] 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    
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 23.3 (15.3)    
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 (8.0) 23.8    
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax 1.7 (5.0)    
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax [5] 11.1 (10.0)    
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax (2.6) 2.0    
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax 2.2 10.8    
AOCI Attributable to Parent        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Defined benefit plans, net current period other comprehensive income (loss) (0.3) (0.6)    
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 23.3 (15.3)    
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax $ 2.2 $ 10.8    
[1]
Amounts are net of tax of $0.1 million for the three months ended March 31, 2025 and $0.3 million for the three months ended March 31, 2024.
[2]
Amounts are net of tax of $(0.9) million for the three months ended March 31, 2025 and $(3.0) million for the three months ended March 31, 2024.
[3]
These amounts were reclassified from AOCI to Other expense, net for the three months ended March 31, 2025 and March 31, 2024.
[4]
The amount reclassified from AOCI to net income for the three months ended March 31, 2025 reflects 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. This amount was reclassified to Other expense, net. See Note 2 - Acquisitions and Dispositions for further details.
[5]
The amounts reclassified from AOCI included $4.1 million in cost of goods sold (COGS), $(1.0) million in interest expense and $8.0 million in Other expense, net for the three months ended March 31, 2025 and $(4.7) million in COGS, $(0.3) million in interest expense and $(5.0) million in Other expense, net for the three months ended March 31, 2024.