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INCOME TAXES INCOME TAXES (Schedule of Deferred Tax Assets and Liabilities) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Income Tax Contingency [Line Items]    
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions $ 108.3us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions $ 88.4us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions
Deferred Tax Assets, MMRT Starting Base Allowance 0clf_DeferredTaxAssetsMmrtStartingBaseAllowance 300.3clf_DeferredTaxAssetsMmrtStartingBaseAllowance
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits 63.0us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits 58.0us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax 267.7us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 299.2us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
Deferred Tax Assets Development Costs 6.0clf_DeferredTaxAssetsDevelopmentCosts 0clf_DeferredTaxAssetsDevelopmentCosts
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Asset Retirement Obligations 48.9us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations 61.7us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations
Deferred Tax Assets, Operating Loss Carryforwards 1,083.5us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 524.4us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Deferred Tax Assets, Inventory 32.3us-gaap_DeferredTaxAssetsInventory 16.4us-gaap_DeferredTaxAssetsInventory
Deferred Tax Assets, Property, Plant and Equipment 901.6us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 56.0us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Deferred Tax Assets, State Taxes 41.9us-gaap_DeferredTaxAssetsStateTaxes 0us-gaap_DeferredTaxAssetsStateTaxes
Deferred Tax Assets Leasing Arrangements 14.1clf_DeferredTaxAssetsLeasingArrangements 31.9clf_DeferredTaxAssetsLeasingArrangements
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other 153.6us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther 138.3us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther
Deferred Tax Assets, Gross 2,720.9us-gaap_DeferredTaxAssetsGross 1,574.6us-gaap_DeferredTaxAssetsGross
Deferred Tax Assets, Valuation Allowance (2,224.5)us-gaap_DeferredTaxAssetsValuationAllowance (864.1)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred Tax Assets, Net of Valuation Allowance 496.4us-gaap_DeferredTaxAssetsNet 710.5us-gaap_DeferredTaxAssetsNet
Deferred Tax Liabilities, Property, Plant and Equipment (20.0)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (1,400.8)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Deferred Tax Liabilities Investment In Ventures (198.0)clf_DeferredTaxLiabilitiesInvestmentInVentures (196.4)clf_DeferredTaxLiabilitiesInvestmentInVentures
Deferred Tax Liabilities, Intangible Assets (7.3)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (33.5)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Deferred Tax Liabilities Income Tax Uncertainties (49.5)clf_DeferredTaxLiabilitiesIncomeTaxUncertainties (48.5)clf_DeferredTaxLiabilitiesIncomeTaxUncertainties
Deferred Tax Liabilities, Tax Deferred Income (16.6)us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome (12.8)us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome
Deferred Tax Liabilities Other Assets (80.2)clf_DeferredTaxLiabilitiesOtherAssets (93.0)clf_DeferredTaxLiabilitiesOtherAssets
Deferred Tax Liabilities, Net (371.6)us-gaap_DeferredTaxLiabilities (1,785.0)us-gaap_DeferredTaxLiabilities
Deferred Tax Assets, Net $ 124.8us-gaap_DeferredTaxAssetsLiabilitiesNet $ (1,074.5)us-gaap_DeferredTaxAssetsLiabilitiesNet