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Earnings Per Share Warrants Issued to General Motors (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2009
2009 GM agreement, number of shares available for purchase through exercise of warrants |  | 4.1
2009 GM agreement, exercise price of warrants issued to GM |  | $ 2.76
2008 GM agreement, shares issued to GM through exercise of warrants | 3.3 |

X
- Definition Represents the number of shares issued to GM during the period associated with the exercise by GM of the warrants issued as part of the 2009 Settlement and Commercial Agreement between AAM and GM. + References No definition available. + Details
Name: | axl_A2008GmAgreementSharesIssuedToGmThroughExerciseOfWarrants
Namespace Prefix: | axl_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the exercise price of the warrants issued to GM as part of the 2009 Setlement and Commercial Agreement between AAM and GM. + References No definition available. + Details
Name: | axl_A2009GmAgreementExercisePriceOfWarrantsIssuedToGm
Namespace Prefix: | axl_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of shares of AAM's common stock that GM was entitled to purchase, per the 2009 Settlement and Commercial Agreement between AAM and GM, through the exercise of warrants issued to GM. + References No definition available. + Details
Name: | axl_A2009GmAgreementNumberOfSharesAvailableForPurchaseThroughExerciseOfWarrants
Namespace Prefix: | axl_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration