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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
shares in Millions, $ in Millions
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Treasury Stock
AOCI Attributable to Parent
Noncontrolling Interest
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 Income attributable to AAM       89.4      
Net income (loss) attributable to noncontrolling interest             0.1
Stock issued during period, shares, share-based compensation, net of forfeitures 0.6            
Stock-based compensation     6.6        
Treasury stock, shares, acquired (0.2)            
Purchase of treasury stock         (3.5)    
Changes in cash flow hedges           15.1  
Foreign currency translation adjustments           37.9  
Defined benefit plans, net           1.3  
Purchase of noncontrolling interest             (0.9)
Common stock, shares, outstanding at Mar. 31, 2018 111.7            
Total AAM stockholders' equity at Mar. 31, 2018   1.2 1,271.2 850.4 (201.6) (238.4) 3.2
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 Income attributable to AAM $ 240.5            
Net income (loss) attributable to noncontrolling interest 0.3            
Purchase of treasury stock $ 3.6            
Common stock, shares, outstanding at Jun. 30, 2018 111.7            
Total AAM stockholders' equity at Jun. 30, 2018   1.2 1,278.3 1,001.5 (201.7) (315.1) 2.0
Common stock, shares, outstanding at Mar. 31, 2018 111.7            
Total AAM stockholders' equity at Mar. 31, 2018   1.2 1,271.2 850.4 (201.6) (238.4) 3.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net Income attributable to AAM $ 151.1     151.1      
Net income (loss) attributable to noncontrolling interest $ 0.2           0.2
Stock-based compensation     7.1        
Treasury stock, shares, acquired 0.0            
Purchase of treasury stock         (0.1)    
Changes in cash flow hedges           (7.9)  
Foreign currency translation adjustments           (81.0)  
Defined benefit plans, net           12.2  
Purchase of noncontrolling interest             (1.4)
Common stock, shares, outstanding at Jun. 30, 2018 111.7            
Total AAM stockholders' equity at Jun. 30, 2018   1.2 1,278.3 1,001.5 (201.7) (315.1) 2.0
Common stock, shares, outstanding at Dec. 31, 2018 111.7            
Total AAM stockholders' equity at Dec. 31, 2018 $ 1,483.9 1.2 1,292.6 703.5 (201.8) (311.6) 2.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net Income attributable to AAM       41.6      
Net income (loss) attributable to noncontrolling interest             0.1
Stock issued during period, shares, share-based compensation, net of forfeitures 1.2            
Stock-based compensation     5.5        
New accounting pronouncement or change in accounting principle, effect of adoption, quantification | ASU 2016-02 [Member]       1.9      
New accounting pronouncement or change in accounting principle, effect of adoption, quantification | ASU 2018-02 [Member]       27.7   (27.7)  
Treasury stock, shares, acquired (0.4)            
Purchase of treasury stock         (7.3)    
Changes in cash flow hedges           (2.5)  
Foreign currency translation adjustments           (2.5)  
Defined benefit plans, net           0.7  
Common stock, shares, outstanding at Mar. 31, 2019 112.5            
Total AAM stockholders' equity at Mar. 31, 2019   1.2 1,298.1 774.7 (209.1) (343.6) 2.5
Common stock, shares, outstanding at Dec. 31, 2018 111.7            
Total AAM stockholders' equity at Dec. 31, 2018 $ 1,483.9 1.2 1,292.6 703.5 (201.8) (311.6) 2.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net Income attributable to AAM 94.1            
Net income (loss) attributable to noncontrolling interest 0.3            
Purchase of treasury stock $ 7.5            
Common stock, shares, outstanding at Jun. 30, 2019 112.5            
Total AAM stockholders' equity at Jun. 30, 2019 $ 1,569.5 1.2 1,303.8 827.2 (209.3) (353.4) 2.7
Common stock, shares, outstanding at Mar. 31, 2019 112.5            
Total AAM stockholders' equity at Mar. 31, 2019   1.2 1,298.1 774.7 (209.1) (343.6) 2.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net Income attributable to AAM $ 52.5     52.5      
Net income (loss) attributable to noncontrolling interest $ 0.2           0.2
Stock-based compensation     5.7        
Treasury stock, shares, acquired 0.0            
Purchase of treasury stock         (0.2)    
Changes in cash flow hedges           (15.8)  
Foreign currency translation adjustments           4.9  
Defined benefit plans, net           1.1  
Common stock, shares, outstanding at Jun. 30, 2019 112.5            
Total AAM stockholders' equity at Jun. 30, 2019 $ 1,569.5 $ 1.2 $ 1,303.8 $ 827.2 $ (209.3) $ (353.4) $ 2.7