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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, 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)       38.6      
Net income (loss) attributable to noncontrolling interest             0.0
Stock issued during period, shares, share-based compensation, net of forfeitures 1.0            
Vesting of restricted stock units and performance shares   0.1          
Stock-based compensation     5.3        
Treasury stock, shares, acquired (0.4)            
Purchase of treasury stock         (4.0)    
Changes in cash flow hedges, net of tax           (0.3)  
Foreign currency translation adjustments           (11.0)  
Defined benefit plans, net of tax           2.1  
Loss on sale of business             (2.7)
Common stock, shares, outstanding at Mar. 31, 2021 113.9            
Total AAM stockholders' equity at Mar. 31, 2021   1.3 1,338.6 (281.2) (216.0) (441.4) 0.0
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) $ 52.2            
Purchase of treasury stock 4.3            
Changes in cash flow hedges, net of tax [1] 3.0            
Foreign currency translation adjustments (8.4)            
Defined benefit plans, net of tax [2] $ 6.5            
Common stock, shares, outstanding at Sep. 30, 2021 114.1            
Total AAM stockholders' equity at Sep. 30, 2021   1.3 1,346.5 (267.6) (216.3) (431.1) 0.0
Common stock, shares, outstanding at Mar. 31, 2021 113.9            
Total AAM stockholders' equity at Mar. 31, 2021   1.3 1,338.6 (281.2) (216.0) (441.4) 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss)       16.0      
Net income (loss) attributable to noncontrolling interest             0.0
Stock issued during period, shares, share-based compensation, net of forfeitures 0.2            
Stock-based compensation     4.7        
Treasury stock, shares, acquired 0.0            
Purchase of treasury stock         (0.2)    
Changes in cash flow hedges, net of tax           5.1  
Foreign currency translation adjustments           12.2  
Defined benefit plans, net of tax           2.2  
Common stock, shares, outstanding at Jun. 30, 2021 114.1            
Total AAM stockholders' equity at Jun. 30, 2021   1.3 1,343.3 (265.2) (216.2) (421.9) 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) $ (2.4)     (2.4)      
Net income (loss) attributable to noncontrolling interest             0.0
Stock-based compensation     3.2        
Treasury stock, shares, acquired 0.0            
Purchase of treasury stock         (0.1)    
Changes in cash flow hedges, net of tax $ (1.8) [1]         (1.8)  
Foreign currency translation adjustments (9.6)         (9.6)  
Defined benefit plans, net of tax $ 2.2 [2]         2.2  
Common stock, shares, outstanding at Sep. 30, 2021 114.1            
Total AAM stockholders' equity at Sep. 30, 2021   1.3 1,346.5 (267.6) (216.3) (431.1) 0.0
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)       1.0      
Net income (loss) attributable to noncontrolling interest             0.0
Stock issued during period, shares, share-based compensation, net of forfeitures 0.7            
Vesting of restricted stock units and performance shares   0.0          
Stock-based compensation     4.5        
Treasury stock, shares, acquired (0.2)            
Purchase of treasury stock         (1.8)    
Changes in cash flow hedges, net of tax           15.7  
Foreign currency translation adjustments           6.0  
Defined benefit plans, net of tax           1.3  
Common stock, shares, outstanding at Mar. 31, 2022 114.5            
Total AAM stockholders' equity at Mar. 31, 2022   1.3 1,356.0 (312.9) (218.1) (341.8) 0.0
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) 50.4            
Purchase of treasury stock 1.9            
Changes in cash flow hedges, net of tax [1] 33.1            
Foreign currency translation adjustments (70.7)            
Defined benefit plans, net of tax [2] $ 4.1            
Common stock, shares, outstanding at Sep. 30, 2022 114.5            
Total AAM stockholders' equity at Sep. 30, 2022 $ 486.5 1.3 1,365.2 (263.5) (218.2) (398.3) 0.0
Common stock, shares, outstanding at Mar. 31, 2022 114.5            
Total AAM stockholders' equity at Mar. 31, 2022   1.3 1,356.0 (312.9) (218.1) (341.8) 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss)       22.9      
Net income (loss) attributable to noncontrolling interest             0.0
Stock-based compensation     4.6        
Treasury stock, shares, acquired 0.0            
Purchase of treasury stock         (0.1)    
Changes in cash flow hedges, net of tax           (1.7)  
Foreign currency translation adjustments           (42.3)  
Defined benefit plans, net of tax           1.3  
Common stock, shares, outstanding at Jun. 30, 2022 114.5            
Total AAM stockholders' equity at Jun. 30, 2022   1.3 1,360.6 (290.0) (218.2) (384.5) 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) $ 26.5     26.5      
Net income (loss) attributable to noncontrolling interest             0.0
Stock-based compensation     4.6        
Changes in cash flow hedges, net of tax 19.1 [1]         19.1  
Foreign currency translation adjustments (34.4)         (34.4)  
Defined benefit plans, net of tax $ 1.5 [2]         1.5  
Common stock, shares, outstanding at Sep. 30, 2022 114.5            
Total AAM stockholders' equity at Sep. 30, 2022 $ 486.5 $ 1.3 $ 1,365.2 $ (263.5) $ (218.2) $ (398.3) $ 0.0
[1] Amounts are net of tax of $(4.9) million and $(7.6) million for the three and nine months ended September 30, 2022, and $(0.7) million and $(2.7) million for the three and nine months ended September 30, 2021, respectively.
[2] Amounts are net of tax of $(0.4) million and $(1.4) million for the three and nine months ended September 30, 2022, and $(0.6) million and $(1.7) million for the three and nine months ended September 30, 2021, respectively.