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Consolidated Statements of Stockholders' Equity (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax     $ (2.0) $ 7.8 $ (6.8)  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax     (26.2) (9.4) (27.3)  
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax     76.6 (58.9) (63.5)  
Paid-in capital 612.8 600.9 612.8 600.9    
Accumulated deficit (181.3) (275.8) (181.3) (275.8)    
Treasury stock (182.5) (182.1) (182.5) (182.1)    
Accumulated other comprehensive income (loss), net of tax (216.2) (264.6) (216.2) (264.6)    
Noncontrolling interest in subsidiaries 0 0 0 0 5.9 11.4
Net income attributable to AAM 29.8 319.9 94.5 367.7 142.8  
Net loss attributable to noncontrolling interests     0 1.0 5.7  
Foreign currency translation adjustments attributable to noncontrolling interests     0 0.3 0.2  
2008 GM agreement, shares issued to GM through exercise of warrants         3.3  
Common Stock [Member]
            
Common stock, shares outstanding 75.6 74.8 75.6 74.8 73.8 68.8
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     0.8 1.5 1.7  
Treasury stock, shares, acquired     0 (0.5) 0  
Additional Paid-in Capital [Member]
            
Paid-in capital 612.8 600.9 612.8 600.9 597.2 588.1
Change in additional paid in capital for exercise of stock options and vesting of restricted stock     1.1 0.1 4.6  
Adjustments to additional paid in capital, stock based compensation     10.8 2.4 4.5  
Retained Earnings [Member]
            
Accumulated deficit (181.3) (275.8) (181.3) (275.8) (643.5) (786.3)
Net income attributable to AAM     94.5 367.7 142.8  
Treasury Stock [Member]
            
Treasury stock (182.5) (182.1) (182.5) (182.1) (176.2) (176.1)
Treasury stock, value, acquired, cost method     (0.4) (5.9) (0.1)  
Accumulated Other Comprehensive Income (Loss) [Member]
            
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax     (2.0) 7.8 (6.8)  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax     (26.2) (9.7) (27.5)  
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax     (76.6) 58.9 63.5  
Accumulated other comprehensive income (loss), net of tax $ (216.2) $ (264.6) $ (216.2) $ (264.6) $ (203.8) $ (106.0)