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Employee Benefit Plans Defined Contribution Plans (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Salaried Savings Plan [Member] |  |  |
Defined contribution plans, maximum company match, salaried voluntary savings plan | 50.00%axl_DefinedContributionPlansMaximumCompanyMatchSalariedVoluntarySavingsPlan / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = axl_SalariedSavingsPlanMember |  |
Defined contribution plans, ARC, maximum employee contribution percentage | 10.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = axl_SalariedSavingsPlanMember |  |
Defined contribution plans, salaried voluntary savings plan, matching contributions during the period | $ 3.9 axl_DefinedContributionPlansSalariedVoluntarySavingsPlanMatchingContributionsDuringPeriod / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = axl_SalariedSavingsPlanMember | $ 3.9 axl_DefinedContributionPlansSalariedVoluntarySavingsPlanMatchingContributionsDuringPeriod / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = axl_SalariedSavingsPlanMember | $ 3.3 axl_DefinedContributionPlansSalariedVoluntarySavingsPlanMatchingContributionsDuringPeriod / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = axl_SalariedSavingsPlanMember
Annual Retirement Contribution (ARC) [Member] |  |  |
Defined contribution plans, ARC, maximum employee contribution percentage | 5.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent / us-gaap_DefinedContributionPlanTypeAxis = axl_AnnualRetirementContributionArcMember |  |
Defined contribution plan, employer matching contribution, percent | 3.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent / us-gaap_DefinedContributionPlanTypeAxis = axl_AnnualRetirementContributionArcMember |  |
Defined contribution plans, ARC, contributions made during period | 4.9 axl_DefinedContributionPlansArcContributionsMadeDuringPeriod / us-gaap_DefinedContributionPlanTypeAxis = axl_AnnualRetirementContributionArcMember | 4.6 axl_DefinedContributionPlansArcContributionsMadeDuringPeriod / us-gaap_DefinedContributionPlanTypeAxis = axl_AnnualRetirementContributionArcMember | 4.4 axl_DefinedContributionPlansArcContributionsMadeDuringPeriod / us-gaap_DefinedContributionPlanTypeAxis = axl_AnnualRetirementContributionArcMember
Defined contribution plans, ARC, hourly associates, contributions made during period | 2.6 axl_DefinedContributionPlansArcHourlyAssociatesContributionsMadeToDuringPeriod / us-gaap_DefinedContributionPlanTypeAxis = axl_AnnualRetirementContributionArcMember | 1.9 axl_DefinedContributionPlansArcHourlyAssociatesContributionsMadeToDuringPeriod / us-gaap_DefinedContributionPlanTypeAxis = axl_AnnualRetirementContributionArcMember | 1.6 axl_DefinedContributionPlansArcHourlyAssociatesContributionsMadeToDuringPeriod / us-gaap_DefinedContributionPlanTypeAxis = axl_AnnualRetirementContributionArcMember
Hourly Voluntary Savings Plan [Member] |  |  |
Defined contribution plans, ARC, maximum employee contribution percentage | 6.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent / us-gaap_DefinedContributionPlanTypeAxis = axl_HourlyVoluntarySavingsPlanMember |  |
Defined contribution plan, maximum annual contribution per employee, amount | 25.00%axl_DefinedContributionPlansMaximumCompanyMatchHourlyVoluntarySavingsPlan / us-gaap_DefinedContributionPlanTypeAxis = axl_HourlyVoluntarySavingsPlanMember |  |
Defined contribution plans, hourly voluntary savings plan, matching contributions during the period | $ 0.1 axl_DefinedContributionPlansHourlyVoluntarySavingsPlanMatchingContributionsDuringPeriod / us-gaap_DefinedContributionPlanTypeAxis = axl_HourlyVoluntarySavingsPlanMember | $ 0.1 axl_DefinedContributionPlansHourlyVoluntarySavingsPlanMatchingContributionsDuringPeriod / us-gaap_DefinedContributionPlanTypeAxis = axl_HourlyVoluntarySavingsPlanMember | $ 0.1 axl_DefinedContributionPlansHourlyVoluntarySavingsPlanMatchingContributionsDuringPeriod / us-gaap_DefinedContributionPlanTypeAxis = axl_HourlyVoluntarySavingsPlanMember

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- 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 the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=axl_SalariedSavingsPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedContributionPlanTypeAxis=axl_AnnualRetirementContributionArcMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedContributionPlanTypeAxis=axl_HourlyVoluntarySavingsPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |