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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Millions, $ in Millions
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
AOCI Attributable to Parent [Member]
Noncontrolling Interest [Member]
Common stock, shares, outstanding at Dec. 31, 2015 76.1            
Total AAM stockholders' equity at Dec. 31, 2015   $ 0.8 $ 638.9 $ 178.4 $ (185.9) $ (356.5) $ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) attributable to AAM $ 240.7     240.7      
Net income attributable to noncontrolling interests 0.0            
Changes in cash flow hedges (10.3)         (10.3)  
Foreign currency translation adjustments (3.2)         (3.2)  
Defined benefit plans, net (19.6)         (19.6)  
Acquisition of MPG $ 0.0            
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 0.2        
Adjustments to additional paid in capital, share-based compensation, requisite service period recognition     21.0        
Modified-retrospective application of ASU 2016-09       4.8      
Treasury stock, shares, acquired (0.3)            
Purchase of treasury stock $ 5.2       (5.2)    
Common stock, shares, outstanding at Dec. 31, 2016 76.5            
Total AAM stockholders' equity at Dec. 31, 2016   0.9 660.1 423.9 (191.1) (389.6) 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) attributable to AAM $ 337.1     337.1      
Net income attributable to noncontrolling interests (0.4)           0.4
Changes in cash flow hedges 17.1         17.1  
Foreign currency translation adjustments 88.3         88.3  
Defined benefit plans, net $ (8.5)         (8.5)  
Stock issued during period, shares, acquisitions 34.3            
Acquisition of MPG $ 576.7 0.3 579.6   (1.7)   3.6
Stock issued during period, shares, share-based compensation, net of forfeitures 0.8            
Stock issued during period, value, share-based compensation, net of forfeitures     0.9        
Adjustments to additional paid in capital, share-based compensation, requisite service period recognition     24.0        
Treasury stock, shares, acquired (0.3)            
Purchase of treasury stock $ 7.0       (5.3)    
Common stock, shares, outstanding at Dec. 31, 2017 111.3            
Total AAM stockholders' equity at Dec. 31, 2017 $ 1,536.0 1.2 1,264.6 761.0 (198.1) (292.7) 4.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) attributable to AAM (57.5)            
Net income attributable to noncontrolling interests (0.7)           0.7
Changes in cash flow hedges 5.5         5.5  
Foreign currency translation adjustments (62.5)         (62.5)  
Defined benefit plans, net 38.1         38.1  
Acquisition of MPG $ 0.0            
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        
Adjustments to additional paid in capital, share-based compensation, requisite service period recognition     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            
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Purchase of noncontrolling interest             (2.3)
Total AAM stockholders' equity at Dec. 31, 2018 $ 1,483.9 $ 1.2 $ 1,292.6 $ 703.5 $ (201.8) $ (311.6) $ 2.4