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Employee Benefit Plans Change in Fair Value of Level 3 OPEB Assets (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value, measurement with unobservable inputs reconciliation, recurring basis, asset value | $ 105.6 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue | $ 64.5 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue | $ 47.6 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Defined Benefit Plan, Actual Return on Plan Assets [Abstract] |  |  |
Relating to assets still held at the reporting date | 3.3 axl_FairValueLevel3PensionAssetsRemainingHeldAtReportingDate | 3.5 axl_FairValueLevel3PensionAssetsRemainingHeldAtReportingDate |
Purchases, sales and settlements, net | $ 37.8 us-gaap_DefinedBenefitPlanPurchasesSalesAndSettlements | $ 13.4 us-gaap_DefinedBenefitPlanPurchasesSalesAndSettlements |

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- Definition Represents the actual return on Fair Value Level 3 pension assets that remain held at the relevant reporting dates for the reporting periods presented. + References No definition available. + Details
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- Details
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- Details
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- Definition Amount of increase (decrease) in plan assets from purchases, sales and settlement of plan obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02)(B) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(iv)(02)(B) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2446-114920 + Details
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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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