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Defined Contribution Plans (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Annual Retirement Contribution (ARC) [Member] |  |  |
Defined contribution plans, ARC, maximum employee contribution percentage | 5.00% |  |
Defined contribution plan, employer matching contribution, percent | 3.00% |  |
Defined contribution plans, ARC, contributions made during period | $ 7.3 | $ 7.1 | $ 7.7
Salaried Savings Plan [Member] |  |  |
Defined contribution plans, maximum company match, salaried voluntary savings plan | 50.00% |  |
Defined contribution plans, ARC, maximum employee contribution percentage | 10.00% |  |
Defined contribution plans, salaried voluntary savings plan, matching contributions during the period | $ 12.4 | $ 10.0 | $ 5.6

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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

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- 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

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- 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

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- 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

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- 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_RetirementPlanTypeAxis=axl_AnnualRetirementContributionArcMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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