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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, 2017 111.3            
Total AAM stockholders' equity at Dec. 31, 2017   $ 1.2 $ 1,264.6 $ 761.0 $ (198.1) $ (292.7) $ 4.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net Loss Attributable to AAM $ (57.5)     (57.5)      
Net income attributable to noncontrolling interests (0.7)           0.7
Changes in cash flow hedges           5.5  
Foreign currency translation adjustments           (62.5)  
Foreign currency translation adjustments attributable to noncontrolling interests $ 0.0            
Defined benefit plans, net           38.1  
Purchase of noncontrolling interest             (2.3)
Stock issued during period, shares, share-based compensation, net of forfeitures 0.7            
Stock issued during period, value, share-based compensation, net of forfeitures     0.1        
Stock-based compensation     27.9        
Treasury stock, shares, acquired (0.3)            
Purchase of treasury stock $ 3.7       (3.7)    
Common stock, shares, outstanding at Dec. 31, 2018 111.7            
Total AAM stockholders' equity at Dec. 31, 2018   1.2 1,292.6 703.5 (201.8) (311.6) 2.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net Loss Attributable to AAM $ (484.5)     (484.5)      
Net income attributable to noncontrolling interests (0.4)           0.4
Changes in cash flow hedges           (14.6)  
Foreign currency translation adjustments           (4.6)  
Foreign currency translation adjustments attributable to noncontrolling interests $ 0.0            
Defined benefit plans, net           (18.3)  
Stock issued during period, shares, share-based compensation, net of forfeitures 1.3            
Stock-based compensation     21.3        
New accounting pronouncement, effect of adoption | ASU 2016-02 [Member]       1.9      
New accounting pronouncement, effect of adoption | ASU 2018-02 [Member] $ 27.7     27.7   (27.7)  
Treasury stock, shares, acquired (0.4)            
Purchase of treasury stock $ 7.5       (7.5)    
Common stock, shares, outstanding at Dec. 31, 2019 112.6            
Total AAM stockholders' equity at Dec. 31, 2019 $ 977.6 1.2 1,313.9 248.6 (209.3) (376.8) 2.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net 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)  
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-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 $ 370.5 $ 1.2 $ 1,333.3 $ (319.8) $ (212.0) $ (432.2) $ 2.7