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Defined Contribution Plans (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	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

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 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

X

- 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: