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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
Noncurrent deferred tax assets $ 368.8us-gaap_DeferredTaxAssetsNetNoncurrent $ 341.8us-gaap_DeferredTaxAssetsNetNoncurrent
U.S. tax on unremitted foreign earnings 0us-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 359.7us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent 332.0us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Deferred Tax Assets, Noncurrent [Member]    
Employee benefits 193.9us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits
/ axl_DeferredTaxAssetsByBalanceSheetClassificationAxis
= axl_DeferredTaxAssetsNoncurrentMember
161.5us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits
/ axl_DeferredTaxAssetsByBalanceSheetClassificationAxis
= axl_DeferredTaxAssetsNoncurrentMember
NOL carryforwards 104.7us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
/ axl_DeferredTaxAssetsByBalanceSheetClassificationAxis
= axl_DeferredTaxAssetsNoncurrentMember
176.9us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
/ axl_DeferredTaxAssetsByBalanceSheetClassificationAxis
= axl_DeferredTaxAssetsNoncurrentMember
Tax credit carryforward 69.8us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
/ axl_DeferredTaxAssetsByBalanceSheetClassificationAxis
= axl_DeferredTaxAssetsNoncurrentMember
82.9us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
/ axl_DeferredTaxAssetsByBalanceSheetClassificationAxis
= axl_DeferredTaxAssetsNoncurrentMember
Capital allowance carryforward 14.4us-gaap_TaxCreditCarryforwardDeferredTaxAsset
/ axl_DeferredTaxAssetsByBalanceSheetClassificationAxis
= axl_DeferredTaxAssetsNoncurrentMember
16.0us-gaap_TaxCreditCarryforwardDeferredTaxAsset
/ axl_DeferredTaxAssetsByBalanceSheetClassificationAxis
= axl_DeferredTaxAssetsNoncurrentMember
Fixed assets 6.6axl_DeferredTaxAssetsFixedAssets
/ axl_DeferredTaxAssetsByBalanceSheetClassificationAxis
= axl_DeferredTaxAssetsNoncurrentMember
10.3axl_DeferredTaxAssetsFixedAssets
/ axl_DeferredTaxAssetsByBalanceSheetClassificationAxis
= axl_DeferredTaxAssetsNoncurrentMember
Deferred revenue 12.6us-gaap_DeferredTaxAssetsDeferredIncome
/ axl_DeferredTaxAssetsByBalanceSheetClassificationAxis
= axl_DeferredTaxAssetsNoncurrentMember
15.7us-gaap_DeferredTaxAssetsDeferredIncome
/ axl_DeferredTaxAssetsByBalanceSheetClassificationAxis
= axl_DeferredTaxAssetsNoncurrentMember
Capitalized expenditures 111.2axl_DeferredTaxAssetsNoncurrentCapitalizedExpenditures
/ axl_DeferredTaxAssetsByBalanceSheetClassificationAxis
= axl_DeferredTaxAssetsNoncurrentMember
113.6axl_DeferredTaxAssetsNoncurrentCapitalizedExpenditures
/ axl_DeferredTaxAssetsByBalanceSheetClassificationAxis
= axl_DeferredTaxAssetsNoncurrentMember
Other 2.3us-gaap_DeferredTaxAssetsOther
/ axl_DeferredTaxAssetsByBalanceSheetClassificationAxis
= axl_DeferredTaxAssetsNoncurrentMember
2.9us-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 368.8us-gaap_DeferredTaxAssetsNetNoncurrent
/ axl_DeferredTaxAssetsByBalanceSheetClassificationAxis
= axl_DeferredTaxAssetsNoncurrentMember
426.8us-gaap_DeferredTaxAssetsNetNoncurrent
/ axl_DeferredTaxAssetsByBalanceSheetClassificationAxis
= axl_DeferredTaxAssetsNoncurrentMember
Deferred Tax Assets, Current [Member]    
Employee benefits 26.0us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits
/ axl_DeferredTaxAssetsByBalanceSheetClassificationAxis
= axl_DeferredTaxAssetsCurrentMember
14.5us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits
/ axl_DeferredTaxAssetsByBalanceSheetClassificationAxis
= axl_DeferredTaxAssetsCurrentMember
Other $ 16.9us-gaap_DeferredTaxAssetsOther
/ axl_DeferredTaxAssetsByBalanceSheetClassificationAxis
= axl_DeferredTaxAssetsCurrentMember
$ 24.6us-gaap_DeferredTaxAssetsOther
/ axl_DeferredTaxAssetsByBalanceSheetClassificationAxis
= axl_DeferredTaxAssetsCurrentMember