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Income Taxes Components of Current Deferred Tax Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Total current deferred tax assets | $ 40.2 us-gaap_DeferredTaxAssetsNetCurrent | $ 34.9 us-gaap_DeferredTaxAssetsNetCurrent
Unrealized foreign exchange gain and other | (0.1)us-gaap_DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains | (0.1)us-gaap_DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains
Current deferred tax asset, net | 40.1 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent | 36.3 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
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
Inventory | 7.5 us-gaap_DeferredTaxAssetsInventory / axl_DeferredTaxAssetsByBalanceSheetClassificationAxis = axl_DeferredTaxAssetsCurrentMember | 8.0 us-gaap_DeferredTaxAssetsInventory / axl_DeferredTaxAssetsByBalanceSheetClassificationAxis = axl_DeferredTaxAssetsCurrentMember
Prepaid taxes and other | 16.9 us-gaap_DeferredTaxAssetsOther / axl_DeferredTaxAssetsByBalanceSheetClassificationAxis = axl_DeferredTaxAssetsCurrentMember | 24.6 us-gaap_DeferredTaxAssetsOther / axl_DeferredTaxAssetsByBalanceSheetClassificationAxis = axl_DeferredTaxAssetsCurrentMember
Valuation allowance | (10.2)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent / axl_DeferredTaxAssetsByBalanceSheetClassificationAxis = axl_DeferredTaxAssetsCurrentMember | (10.7)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent / axl_DeferredTaxAssetsByBalanceSheetClassificationAxis = axl_DeferredTaxAssetsCurrentMember
Total current deferred tax assets | $ 40.2 us-gaap_DeferredTaxAssetsNetCurrent / axl_DeferredTaxAssetsByBalanceSheetClassificationAxis = axl_DeferredTaxAssetsCurrentMember | $ 36.4 us-gaap_DeferredTaxAssetsNetCurrent / 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 inventory. + 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 within one year or 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 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 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 liability attributable to taxable temporary differences from unrealized gains on foreign currency transactions. + 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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