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Consolidated Statements of Stockholders' Equity (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Paid in Capital $ 600.9 $ 597.2 $ 600.9 $ 597.2    
Accumulated Deficit (275.8) (643.5) (275.8) (643.5)    
Treasury Stock (182.1) (176.2) (182.1) (176.2)    
Noncontrolling interest in subsidiaries 0 5.9 0 5.9 11.4 0.3
Net income attributable to AAM 319.9 31.1 367.7 142.8 115.4  
Net loss attributable to the noncontrolling interests     (1.0) (5.7) (0.9)  
Total Comprehensive Income (Loss)     306.2 39.5 72.8  
Foreign Currency Translation Adjustments Attributable to Noncontrolling Interests     0.3 0.2 (0.1)  
Issuance of Noncontrolling Interest in e-AAM         12.0  
Change in Noncontrolling Interest related to acquisition of noncontrolling interest     (5.2)   0.1  
2008 GM Agreement, Shares Issued to GM through Exercise of Warrants       3.3    
Common Stock [Member]
            
Common Stock, Shares Outstanding 74.8 73.8 74.8 73.8 68.8 68.4
Common Stock, Par Value 0.8 0.8 0.8 0.8 0.8 0.8
Stock Issued During Period, Exercise of stock options and vesting of restricted stock     1.5 1.7 0.5  
Treasury Stock, Shares, Acquired     (0.5) 0 (0.1)  
Additional Paid-in Capital [Member]
            
Paid in Capital 600.9 597.2 600.9 597.2 588.1 579.9
Change in additional paid in capital for purchase of noncontrolling interest     1.2   (2.1)  
Change in additional paid in capital for exercise of stock options and vesting of restricted stock     0.1 4.6 1.1  
Adjustments to Additional Paid in Capital, Stock Based Compensation     2.4 4.5 9.2  
Retained Earnings [Member]
            
Accumulated Deficit (275.8) (643.5) (275.8) (643.5) (786.3) (901.7)
Net income attributable to AAM     367.7 142.8 115.4  
Treasury Stock [Member]
            
Treasury Stock (182.1) (176.2) (182.1) (176.2) (176.1) (174.8)
Treasury Stock, Value, Acquired, Cost Method     (5.9) (0.1) (1.3)  
Accumulated Other Comprehensive Income (Loss) [Member]
            
Accumulated Other Comprehensive Income (Loss) (264.6) (203.8) (264.6) (203.8) (106.0) (64.4)
Other Comprehensive Income (Loss), Change in Derivatives, net Attributable to AAM     7.8 (6.8) 1.3  
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Attributable to AAM     (9.7) (27.5) 7.4  
Other Comprehensive Income (Loss), Defined Benefit Plans, Net Attributable to AAM     $ (58.9) $ (63.5) $ (50.3)