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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]
Cumulative effect of change in accounting principle (as described in Note 1)       $ (25.8)      
Common stock, shares, outstanding at Dec. 31, 2014 75.8            
Stock issued during period, shares, share-based compensation, net of forfeitures 0.4            
Treasury stock, shares, acquired (0.1)            
Common stock, shares, outstanding at Dec. 31, 2015 76.1            
Total AAM stockholders' equity at Dec. 31, 2014   $ 0.8 $ 623.7 (31.4) $ (182.8) $ (296.9) $ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
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     15.9        
Change in additional paid in capital for purchase of noncontrolling interest     (1.6)        
Net income attributable to AAM $ 235.6     235.6      
Net income attributable to noncontrolling interests 0.0            
Purchase of treasury stock 3.1       (3.1)    
Changes in cash flow hedges (6.0)         (6.0)  
Foreign currency translation adjustments (70.3)         (70.3)  
Defined benefit plans, net 16.7         16.7  
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]              
Acquisition of MPG $ 0.0            
Stock issued during period, shares, share-based compensation, net of forfeitures 0.7            
Treasury stock, shares, acquired (0.3)            
Common stock, shares, outstanding at Dec. 31, 2016 76.5            
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
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        
Net income attributable to AAM $ 240.7     240.7      
Net income attributable to noncontrolling interests 0.0            
Modified-retrospective application of ASU 2016-09       4.8      
Purchase of treasury stock 5.2       (5.2)    
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)  
Total AAM stockholders' equity at Dec. 31, 2016 504.2 0.9 660.1 423.9 (191.1) (389.6) 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Acquisition of MPG $ 0.0            
Stock issued during period, shares, share-based compensation, net of forfeitures 0.8            
Treasury stock, shares, acquired (0.3)            
Common stock, shares, outstanding at Dec. 31, 2017 111.3            
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
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        
Net income attributable to AAM $ 337.1            
Net income attributable to noncontrolling interests (0.4)           0.4
Purchase of treasury stock 7.0       (5.3)    
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)  
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]              
Stock issued during period, shares, acquisitions 34.3            
Acquisition of MPG $ 576.7 $ 0.3 $ 579.6   $ (1.7)   $ 3.6