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Income Taxes - Detail of Deferred Tax Assets and Liabilities (Details 2) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Deferred tax assets:        
Net operating loss and tax credit carryforwards $ 778.1aks_DeferredTaxAssetsOperatingLossAndTaxCreditCarryforwards $ 663.5aks_DeferredTaxAssetsOperatingLossAndTaxCreditCarryforwards    
Postretirement benefits 201.2us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits 185.0us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits    
Pension benefits 258.6us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions 216.6us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions    
Inventories 152.6us-gaap_DeferredTaxAssetsInventory 118.8us-gaap_DeferredTaxAssetsInventory    
Other assets 114.2us-gaap_DeferredTaxAssetsOther 96.3us-gaap_DeferredTaxAssetsOther    
Valuation allowance (1,000.4)us-gaap_DeferredTaxAssetsValuationAllowance (764.1)us-gaap_DeferredTaxAssetsValuationAllowance (873.1)us-gaap_DeferredTaxAssetsValuationAllowance (22.3)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred tax assets 504.3us-gaap_DeferredTaxAssetsNet 516.1us-gaap_DeferredTaxAssetsNet    
Deferred tax liabilities:        
Depreciable assets (322.7)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (333.1)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment    
Other liabilities (43.6)us-gaap_DeferredTaxLiabilitiesOther (36.8)us-gaap_DeferredTaxLiabilitiesOther    
Total deferred tax liabilities (366.3)us-gaap_DeferredIncomeTaxLiabilities (369.9)us-gaap_DeferredIncomeTaxLiabilities    
Net deferred tax assets 138.0us-gaap_DeferredTaxAssetsLiabilitiesNet 146.2us-gaap_DeferredTaxAssetsLiabilitiesNet    
Unrecognized tax benefits resulting from net operating loss carryforwards 59.9us-gaap_UnrecognizedTaxBenefits 53.8us-gaap_UnrecognizedTaxBenefits 54.0us-gaap_UnrecognizedTaxBenefits 49.2us-gaap_UnrecognizedTaxBenefits
Undistributed earnings of foreign subsidiaries 27.2us-gaap_UndistributedEarningsOfForeignSubsidiaries      
Unrecorded tax liability on undistributed earnings of foreign subsidiaries 9.5us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfForeignSubsidiaries      
Additional Paid-in Capital [Member]        
Deferred tax liabilities:        
Unrecognized tax benefits resulting from net operating loss carryforwards $ 21.3us-gaap_UnrecognizedTaxBenefits
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