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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Millions, $ in Millions
Total
Common Stock
Additional Paid-in Capital
Retained Earnings (Accumulated Deficit)
Treasury Stock, Common
AOCI Attributable to Parent
Common stock, shares, outstanding at Dec. 31, 2021 114.0          
Total AAM stockholders' equity at Dec. 31, 2021   $ 1.3 $ 1,351.5 $ (313.9) $ (216.3) $ (364.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) $ 64.3     64.3    
Changes in hedges $ 32.8         32.8
Foreign currency translation adjustments           (38.4)
Defined benefit plans, net           95.0
Stock issued during period, shares, share-based compensation, net of forfeitures 0.8          
Stock issued during period, value, share-based compensation, net of forfeitures   0.0        
Stock-based compensation     17.7      
Treasury stock, shares, acquired (0.2)          
Purchase of treasury stock $ 1.9       (1.9)  
Common stock, shares, outstanding at Dec. 31, 2022 114.6          
Total AAM stockholders' equity at Dec. 31, 2022   1.3 1,369.2 (249.6) (218.2) (275.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) $ (33.6)     (33.6)    
Changes in hedges $ 3.5         3.5
Foreign currency translation adjustments           7.4
Defined benefit plans, net           1.6
Stock issued during period, shares, share-based compensation, net of forfeitures 4.1          
Stock issued during period, value, share-based compensation, net of forfeitures   0.0        
Stock-based compensation     13.4      
Treasury stock, shares, acquired (1.6)          
Purchase of treasury stock $ 14.7       (14.7)  
Common stock, shares, outstanding at Dec. 31, 2023 117.1          
Total AAM stockholders' equity at Dec. 31, 2023 $ 604.9 1.3 1,382.6 (283.2) (232.9) (262.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) 35.0     35.0    
Changes in hedges $ (32.7)         (32.7)
Foreign currency translation adjustments           (44.7)
Defined benefit plans, net           (11.9)
Stock issued during period, shares, share-based compensation, net of forfeitures 0.9          
Stock issued during period, value, share-based compensation, net of forfeitures   0.0        
Stock-based compensation     15.0      
Treasury stock, shares, acquired (0.4)          
Purchase of treasury stock $ 2.8       (2.8)  
Common stock, shares, outstanding at Dec. 31, 2024 117.6          
Total AAM stockholders' equity at Dec. 31, 2024 $ 562.8 $ 1.3 $ 1,397.6 $ (248.2) $ (235.7) $ (352.2)