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Income Taxes Components of Noncurrent Deferred Tax Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Noncurrent deferred tax assets | $ 368.8 us-gaap_DeferredTaxAssetsNetNoncurrent | $ 341.8 us-gaap_DeferredTaxAssetsNetNoncurrent
U.S. tax on unremitted foreign earnings | 0 us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings | (85.0)us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings
Fixed assets and other | (9.1)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | (9.8)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Noncurrent deferred tax asset, net | 359.7 us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent | 332.0 us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Deferred Tax Assets, Noncurrent [Member] |  |
Employee benefits | 193.9 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits / axl_DeferredTaxAssetsByBalanceSheetClassificationAxis = axl_DeferredTaxAssetsNoncurrentMember | 161.5 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits / axl_DeferredTaxAssetsByBalanceSheetClassificationAxis = axl_DeferredTaxAssetsNoncurrentMember
NOL carryforwards | 104.7 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / axl_DeferredTaxAssetsByBalanceSheetClassificationAxis = axl_DeferredTaxAssetsNoncurrentMember | 176.9 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / axl_DeferredTaxAssetsByBalanceSheetClassificationAxis = axl_DeferredTaxAssetsNoncurrentMember
Tax credit carryforward | 69.8 us-gaap_DeferredTaxAssetsTaxCreditCarryforwards / axl_DeferredTaxAssetsByBalanceSheetClassificationAxis = axl_DeferredTaxAssetsNoncurrentMember | 82.9 us-gaap_DeferredTaxAssetsTaxCreditCarryforwards / axl_DeferredTaxAssetsByBalanceSheetClassificationAxis = axl_DeferredTaxAssetsNoncurrentMember
Capital allowance carryforward | 14.4 us-gaap_TaxCreditCarryforwardDeferredTaxAsset / axl_DeferredTaxAssetsByBalanceSheetClassificationAxis = axl_DeferredTaxAssetsNoncurrentMember | 16.0 us-gaap_TaxCreditCarryforwardDeferredTaxAsset / axl_DeferredTaxAssetsByBalanceSheetClassificationAxis = axl_DeferredTaxAssetsNoncurrentMember
Fixed assets | 6.6 axl_DeferredTaxAssetsFixedAssets / axl_DeferredTaxAssetsByBalanceSheetClassificationAxis = axl_DeferredTaxAssetsNoncurrentMember | 10.3 axl_DeferredTaxAssetsFixedAssets / axl_DeferredTaxAssetsByBalanceSheetClassificationAxis = axl_DeferredTaxAssetsNoncurrentMember
Deferred revenue | 12.6 us-gaap_DeferredTaxAssetsDeferredIncome / axl_DeferredTaxAssetsByBalanceSheetClassificationAxis = axl_DeferredTaxAssetsNoncurrentMember | 15.7 us-gaap_DeferredTaxAssetsDeferredIncome / axl_DeferredTaxAssetsByBalanceSheetClassificationAxis = axl_DeferredTaxAssetsNoncurrentMember
Capitalized expenditures | 111.2 axl_DeferredTaxAssetsNoncurrentCapitalizedExpenditures / axl_DeferredTaxAssetsByBalanceSheetClassificationAxis = axl_DeferredTaxAssetsNoncurrentMember | 113.6 axl_DeferredTaxAssetsNoncurrentCapitalizedExpenditures / axl_DeferredTaxAssetsByBalanceSheetClassificationAxis = axl_DeferredTaxAssetsNoncurrentMember
Other | 2.3 us-gaap_DeferredTaxAssetsOther / axl_DeferredTaxAssetsByBalanceSheetClassificationAxis = axl_DeferredTaxAssetsNoncurrentMember | 2.9 us-gaap_DeferredTaxAssetsOther / axl_DeferredTaxAssetsByBalanceSheetClassificationAxis = axl_DeferredTaxAssetsNoncurrentMember
Valuation allowances | (146.7)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent / axl_DeferredTaxAssetsByBalanceSheetClassificationAxis = axl_DeferredTaxAssetsNoncurrentMember | (153.0)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent / axl_DeferredTaxAssetsByBalanceSheetClassificationAxis = axl_DeferredTaxAssetsNoncurrentMember
Noncurrent deferred tax assets | 368.8 us-gaap_DeferredTaxAssetsNetNoncurrent / axl_DeferredTaxAssetsByBalanceSheetClassificationAxis = axl_DeferredTaxAssetsNoncurrentMember | 426.8 us-gaap_DeferredTaxAssetsNetNoncurrent / axl_DeferredTaxAssetsByBalanceSheetClassificationAxis = axl_DeferredTaxAssetsNoncurrentMember
Deferred Tax Assets, Current [Member] |  |
Employee benefits | 26.0 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits / axl_DeferredTaxAssetsByBalanceSheetClassificationAxis = axl_DeferredTaxAssetsCurrentMember | 14.5 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits / axl_DeferredTaxAssetsByBalanceSheetClassificationAxis = axl_DeferredTaxAssetsCurrentMember
Other | $ 16.9 us-gaap_DeferredTaxAssetsOther / axl_DeferredTaxAssetsByBalanceSheetClassificationAxis = axl_DeferredTaxAssetsCurrentMember | $ 24.6 us-gaap_DeferredTaxAssetsOther / axl_DeferredTaxAssetsByBalanceSheetClassificationAxis = axl_DeferredTaxAssetsCurrentMember

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from deferred income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences expected to be realized or consumed after one year (or the normal operating cycle, if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31917-109318 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31931-109318 + Details
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- Definition Amount after allocation of valuation allowances of noncurrent deferred tax asset attributable to deductible temporary differences and carryforwards. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31917-109318 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31931-109318 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31928-109318 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31958-109318 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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- Definition The tax effect as of the balance sheet date of the amount of future tax deductions arising from all unused tax credit carryforwards which have been reduced by a valuation allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 + Details
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- Definition The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from employee benefit costs not otherwise specified in the taxonomy, which can only be deducted for tax purposes when actual costs are incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized expected to be realized or consumed after one year (or the normal operating cycle, if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31917-109318 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31928-109318 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences from undistributed earnings of subsidiaries and other recognized entities not within the country of domicile of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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- Definition Amount of deferred tax asset, before valuation allowance, attributable to deductible other tax carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 30 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6907311&loc=d3e30536-109315 + Details
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