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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
AOCI Attributable to Parent
Noncontrolling Interest in Subsidiaries
Common stock, shares, outstanding at Dec. 31, 2019 112.6            
Total AAM stockholders' equity at Dec. 31, 2019   $ 1.2 $ 1,313.9 $ 248.6 $ (209.3) $ (376.8) $ 2.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) attributable to AAM $ (561.3)     (561.3)      
Net income attributable to noncontrolling interests (0.2)           0.2
Changes in cash flow hedges (4.4)         (4.4)  
Foreign currency translation adjustments           0.1  
Foreign currency translation adjustments attributable to noncontrolling interests $ (0.3)           (0.3)
Defined benefit plans, net           (51.1)  
Stock issued during period, shares, share-based compensation, net of forfeitures 1.1            
Stock issued during period, value, share-based compensation, net of forfeitures   0.0          
Stock-based compensation     19.4        
New accounting pronouncement, effect of adoption | ASU 2016-13 [Member]       (7.1)      
Treasury stock, shares, acquired (0.4)            
Purchase of treasury stock $ 2.7       (2.7)    
Common stock, shares, outstanding at Dec. 31, 2020 113.3            
Total AAM stockholders' equity at Dec. 31, 2020   1.2 1,333.3 (319.8) (212.0) (432.2) 2.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) attributable to AAM $ 5.9     5.9      
Net income attributable to noncontrolling interests 0.0           0.0
Changes in cash flow hedges 8.5         8.5  
Foreign currency translation adjustments           (10.2)  
Foreign currency translation adjustments attributable to noncontrolling interests $ 0.0           0.0
Defined benefit plans, net           69.1  
Stock issued during period, shares, share-based compensation, net of forfeitures 1.2            
Stock issued during period, value, share-based compensation, net of forfeitures   0.1          
Stock-based compensation     18.2        
Treasury stock, shares, acquired (0.5)            
Purchase of treasury stock $ 4.3       (4.3)    
Noncontrolling Interest, Decrease from Deconsolidation             (2.7)
Common stock, shares, outstanding at Dec. 31, 2021 114.0            
Total AAM stockholders' equity at Dec. 31, 2021 $ 457.8 1.3 1,351.5 (313.9) (216.3) (364.8) 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) attributable to AAM 64.3     64.3      
Net income attributable to noncontrolling interests 0.0           0.0
Changes in cash flow hedges 32.8         32.8  
Foreign currency translation adjustments           (38.4)  
Foreign currency translation adjustments attributable to noncontrolling interests $ 0.0           0.0
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 $ 627.3 $ 1.3 $ 1,369.2 $ (249.6) $ (218.2) $ (275.4) $ 0.0