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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, 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 $ (501.3)     (501.3)      
Net income (loss) attributable to noncontrolling interest $ 0.1           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       (2.4)    
Changes in cash flow hedges, net of tax (34.7) [1]         (34.7)  
Foreign currency translation adjustments (48.8)         (48.5)  
Foreign currency translation adjustments attributable to noncontrolling interests (0.3)           (0.3)
Defined benefit plans, net of tax $ (1.6) [2]         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, 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
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) attributable to AAM 38.6     38.6      
Net income (loss) attributable to noncontrolling interest $ 0.0           0.0
Stock issued during period, shares, share-based compensation, net of forfeitures 1.0            
Exercise of stock options $ 0.1            
Stock-based compensation     5.3        
Treasury stock, shares, acquired (0.4)            
Purchase of treasury stock $ 4.0       (4.0)    
Changes in cash flow hedges, net of tax (0.3) [1]         (0.3)  
Foreign currency translation adjustments (11.0)         (11.0)  
Foreign currency translation adjustments attributable to noncontrolling interests 0.0           0.0
Defined benefit plans, net of tax $ (2.1) [2]         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 $ 401.3 $ 1.3 $ 1,338.6 $ (281.2) $ (216.0) $ (441.4) $ 0.0
[1] Amounts are net of tax of $(1.3) million for the three months ended March 31, 2021, and $2.3 million for the three months ended March 31, 2020, respectively.
[2] Amounts are net of tax of $(0.6) million for the three months ended March 31, 2021, and $(0.4) million for the three months ended March 31, 2020, respectively.