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Employee Benefit Plans - Defined Contribution Plans Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 50.00% |  |
Defined contribution plans, ARC, maximum employee contribution percentage | 10.00% |  |
Defined contribution plans, salaried voluntary savings plan, matching contributions during the period | $ 7.9 | $ 11.5 | $ 12.4
Annual Retirement Contribution (ARC) [Member] |  |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 8.0 | $ 10.3 | $ 7.3
Minimum [Member] | Annual Retirement Contribution (ARC) [Member] |  |  |
Defined Contribution Plan, Employer Discretionary Contribution Percentage |  | 3.00% |
Maximum [Member] | Annual Retirement Contribution (ARC) [Member] |  |  |
Defined Contribution Plan, Employer Discretionary Contribution Percentage |  | 5.00% |

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- Definition Defined Contribution Plan, Employer Discretionary Contribution Percentage + References No definition available. + Details
Name: | axl_DefinedContributionPlanEmployerDiscretionaryContributionPercentage
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 Voluntary Savings Plan. + References No definition available. + Details
Name: | axl_DefinedContributionPlansVoluntarySavingsPlanMatchingContributionsDuringThePeriod
Namespace Prefix: | axl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
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: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |