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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 (Accumulated Deficit)
Treasury Stock
AOCI Attributable to Parent
Noncontrolling Interest
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 income (loss) 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, effect of adoption | ASU 2016-02 [Member]       1.9      
New accounting pronouncement, effect of adoption | 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, net of tax           (2.5)  
Foreign currency translation adjustments           (2.5)  
Defined benefit plans, net of tax           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   1.2 1,292.6 703.5 (201.8) (311.6) 2.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) attributable to AAM $ (30.1)            
Net income (loss) attributable to noncontrolling interest 0.4            
Purchase of treasury stock 7.5            
Changes in cash flow hedges, net of tax [1] (24.7)            
Foreign currency translation adjustments (34.7)            
Foreign currency translation adjustments attributable to noncontrolling interests 0.0            
Defined benefit plans, net of tax [2] $ (0.5)            
Common stock, shares, outstanding at Sep. 30, 2019 112.5            
Total AAM stockholders' equity at Sep. 30, 2019   1.2 1,310.1 703.0 (209.3) (398.2) 2.8
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 (loss) attributable to AAM       52.5      
Net income (loss) attributable to noncontrolling interest             0.2
Stock-based compensation     5.7        
Treasury stock, shares, acquired 0.0            
Purchase of treasury stock         (0.2)    
Changes in cash flow hedges, net of tax           (15.8)  
Foreign currency translation adjustments           4.9  
Defined benefit plans, net of tax           1.1  
Common stock, shares, outstanding at Jun. 30, 2019 112.5            
Total AAM stockholders' equity at Jun. 30, 2019   1.2 1,303.8 827.2 (209.3) (353.4) 2.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) attributable to AAM $ (124.2)     (124.2)      
Net income (loss) attributable to noncontrolling interest 0.1           0.1
Stock-based compensation     6.3        
Changes in cash flow hedges, net of tax (6.4) [1]         (6.4)  
Foreign currency translation adjustments (37.1)         (37.1)  
Foreign currency translation adjustments attributable to noncontrolling interests 0.0            
Defined benefit plans, net of tax $ 1.3 [2]         (1.3)  
Common stock, shares, outstanding at Sep. 30, 2019 112.5            
Total AAM stockholders' equity at Sep. 30, 2019   1.2 1,310.1 703.0 (209.3) (398.2) 2.8
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 income (loss) attributable to AAM       (501.3)      
Net income (loss) attributable to noncontrolling interest             0.1
Stock issued during period, shares, share-based compensation, net of forfeitures 0.8            
Stock-based compensation     4.6        
New accounting pronouncement, effect of adoption | ASU 2016-13 [Member]       (7.1)      
Treasury stock, shares, acquired (0.4)            
Purchase of treasury stock         (2.4)    
Changes in cash flow hedges, net of tax           (34.7)  
Foreign currency translation adjustments           (48.5)  
Foreign currency translation adjustments attributable to noncontrolling interests             (0.3)
Defined benefit plans, net of tax           1.6  
Common stock, shares, outstanding at Mar. 31, 2020 113.0            
Total AAM stockholders' equity at Mar. 31, 2020   1.2 1,318.5 (259.8) (211.7) (458.4) 2.6
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 income (loss) attributable to AAM (597.3)            
Net income (loss) attributable to noncontrolling interest 0.1            
Purchase of treasury stock 2.7            
Changes in cash flow hedges, net of tax [1] (19.3)            
Foreign currency translation adjustments (30.0)            
Foreign currency translation adjustments attributable to noncontrolling interests (0.3)            
Defined benefit plans, net of tax [2] $ (5.0)            
Common stock, shares, outstanding at Sep. 30, 2020 113.3            
Total AAM stockholders' equity at Sep. 30, 2020 $ 340.9 1.2 1,328.3 (355.8) (212.0) (420.8) 2.6
Common stock, shares, outstanding at Mar. 31, 2020 113.0            
Total AAM stockholders' equity at Mar. 31, 2020   1.2 1,318.5 (259.8) (211.7) (458.4) 2.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) attributable to AAM       (213.2)      
Net income (loss) attributable to noncontrolling interest             0.0
Stock issued during period, shares, share-based compensation, net of forfeitures 0.3            
Stock-based compensation     4.7        
Treasury stock, shares, acquired 0.0            
Purchase of treasury stock         (0.3)    
Changes in cash flow hedges, net of tax           8.7  
Foreign currency translation adjustments           4.8  
Defined benefit plans, net of tax           1.7  
Common stock, shares, outstanding at Jun. 30, 2020 113.3            
Total AAM stockholders' equity at Jun. 30, 2020   1.2 1,323.2 (473.0) (212.0) (443.2) 2.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) attributable to AAM $ 117.2     117.2      
Net income (loss) attributable to noncontrolling interest 0.0           0.0
Stock-based compensation     5.1        
Changes in cash flow hedges, net of tax 6.7 [1]         6.7  
Foreign currency translation adjustments 14.0         14.0  
Foreign currency translation adjustments attributable to noncontrolling interests 0.0            
Defined benefit plans, net of tax $ (1.7) [2]         1.7  
Common stock, shares, outstanding at Sep. 30, 2020 113.3            
Total AAM stockholders' equity at Sep. 30, 2020 $ 340.9 $ 1.2 $ 1,328.3 $ (355.8) $ (212.0) $ (420.8) $ 2.6
[1] Amounts are net of tax of $(0.2) million and $1.6 million for the three and nine months ended September 30, 2020, and $1.1 million and $7.3 million for the three and nine months ended September 30, 2019, respectively.
[2] Amounts are net of tax of $(0.4) million and $(1.2) million for the three and nine months ended September 30, 2020, and $0.3 million and $(0.2) million for the three and nine months ended September 30, 2019, respectively.