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Employee Benefit Plans Defined Contribution Plans (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Salaried Savings Plan [Member] |  |  |
Defined Contribution Plans, Maximum Company Match, Salaried Voluntary Savings Plan | 50.00% |  |
Defined Contribution Plans, Salaried Voluntary Savings Plan, Matching Contributions During the Period | $ 3.3 | $ 3.2 | $ 3.1
Defined Contribution Plans, ARC, Range of Percentage of Salary Eligible for Contribution, Low End of Range | 10.00% |  |
Annual Retirement Contribution (ARC) [Member] |  |  |
Defined Contribution Plans, ARC, Hourly Associates, Contributions Made to During Period | 1.6 | 1.9 | 1.8
Defined Contribution Plan, Employer Matching Contribution, Percent | 3.00% |  |
Defined Contribution Plans, ARC, Range of Percentage of Salary Eligible for Contribution, Low End of Range | 5.00% |  |
Defined Contribution Plans, ARC, Contributions Made During Period | 4.4 | 3.6 | 3.5
Hourly Voluntary Savings Plan [Member] |  |  |
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Amount | 25.00% |  |
Defined Contribution Plans, Hourly Voluntary Savings Plan, Matching Contributions During the Period | $ 0.1 | $ 0.2 | $ 0.2
Defined Contribution Plans, ARC, Range of Percentage of Salary Eligible for Contribution, Low End of Range | 6.00% |  |

X
- Definition Represents the total amount of contributions made by AAM during the period associated with the Annual Retirement Contribution (ARC). + References No definition available. + Details
Name: | axl_DefinedContributionPlansArcContributionsMadeDuringPeriod
Namespace Prefix: | axl_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the total amount of contributions made by AAM during the period to retirement accounts of hourly employees associated with the Annual Retirement Contribution (ARC). + References No definition available. + Details
Name: | axl_DefinedContributionPlansArcHourlyAssociatesContributionsMadeToDuringPeriod
Namespace Prefix: | axl_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the total amount of matching contributions made by AAM during the period associated with the Hourly Voluntary Savings Plan. + References No definition available. + Details
Name: | axl_DefinedContributionPlansHourlyVoluntarySavingsPlanMatchingContributionsDuringPeriod
Namespace Prefix: | axl_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the maximum percentage match by AAM of the contributions of hourly associates to the voluntary savings plan, a defined contribution plan. + References No definition available. + Details
Name: | axl_DefinedContributionPlansMaximumCompanyMatchHourlyVoluntarySavingsPlan
Namespace Prefix: | axl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the maximum percentage match by AAM of the contributions of a salaried associate to the voluntary savings plan, a defined contribution plan. + References No definition available. + Details
Name: | axl_DefinedContributionPlansMaximumCompanyMatchSalariedVoluntarySavingsPlan
Namespace Prefix: | axl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the total amount of matching contributions made by AAM during the period associated with the Salaried Voluntary Savings Plan. + References No definition available. + Details
Name: | axl_DefinedContributionPlansSalariedVoluntarySavingsPlanMatchingContributionsDuringPeriod
Namespace Prefix: | axl_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum percentage of employee gross pay, by the terms of the plan, that the employer may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration