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v2.4.1.9

INCOME TAXES INCOME TAXES (Schedule of Effective Rate Reconciliation) (Details) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2014 | Dec. 31, 2013 USD ($) | Dec. 31, 2013 | Dec. 31, 2012 USD ($) | Dec. 31, 2012
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount |  | $ (3,361.3)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate |  | $ 171.3 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate |  | $ (175.6)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate |
Effective Income Tax Rate Reconciliation, Percent |  | 35.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 35.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 35.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 35.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 35.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 35.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Foreign Currency Transaction Gain, before Tax |  | (4.1)us-gaap_ForeignCurrencyTransactionGainBeforeTax |  | (2.6)us-gaap_ForeignCurrencyTransactionGainBeforeTax |  | 62.3 us-gaap_ForeignCurrencyTransactionGainBeforeTax |
Foreign Currency Transaction Gain Before Tax Percent |  | 0.00%clf_ForeignCurrencyTransactionGainBeforeTaxPercent | 0.00%clf_ForeignCurrencyTransactionGainBeforeTaxPercent | (0.50%)clf_ForeignCurrencyTransactionGainBeforeTaxPercent | (0.50%)clf_ForeignCurrencyTransactionGainBeforeTaxPercent | (12.40%)clf_ForeignCurrencyTransactionGainBeforeTaxPercent | (12.40%)clf_ForeignCurrencyTransactionGainBeforeTaxPercent
Non-taxable loss (income) related to noncontrolling interests |  | 290.1 clf_NonTaxableLossIncomeRelatedToNoncontrollingInterests |  | (1.5)clf_NonTaxableLossIncomeRelatedToNoncontrollingInterests |  | 61.0 clf_NonTaxableLossIncomeRelatedToNoncontrollingInterests |
Non-taxable loss (income) related to noncontrolling interests percent |  | (3.00%)clf_Nontaxablelossincomerelatedtononcontrollinginterestspercent | (3.00%)clf_Nontaxablelossincomerelatedtononcontrollinginterestspercent | (0.30%)clf_Nontaxablelossincomerelatedtononcontrollinginterestspercent | (0.30%)clf_Nontaxablelossincomerelatedtononcontrollinginterestspercent | (12.00%)clf_Nontaxablelossincomerelatedtononcontrollinginterestspercent | (12.00%)clf_Nontaxablelossincomerelatedtononcontrollinginterestspercent
Impact Of Tax Law Change |  | 13.0 clf_ImpactOfTaxLawChange |  | 0 clf_ImpactOfTaxLawChange |  | (357.1)clf_ImpactOfTaxLawChange |
Impact Of Tax Law Change Percent |  | (0.10%)clf_ImpactOfTaxLawChangePercent | (0.10%)clf_ImpactOfTaxLawChangePercent | 0.00%clf_ImpactOfTaxLawChangePercent | 0.00%clf_ImpactOfTaxLawChangePercent | 71.20%clf_ImpactOfTaxLawChangePercent | 71.20%clf_ImpactOfTaxLawChangePercent
Income Tax Reconciliation Tax Deduction for percentage depletion in excess of cost depletion |  | (87.9)clf_IncomeTaxReconciliationTaxDeductionForPercentageDepletionInExcessOfCostDepletion |  | (97.6)clf_IncomeTaxReconciliationTaxDeductionForPercentageDepletionInExcessOfCostDepletion |  | (109.1)clf_IncomeTaxReconciliationTaxDeductionForPercentageDepletionInExcessOfCostDepletion |
Income Tax Reconciliation Tax Deduction for percentage depletion in excess of cost depletion percent |  | 0.90%clf_IncomeTaxReconciliationTaxDeductionforpercentagedepletioninexcessofcostdepletionpercent | 0.90%clf_IncomeTaxReconciliationTaxDeductionforpercentagedepletioninexcessofcostdepletionpercent | (19.90%)clf_IncomeTaxReconciliationTaxDeductionforpercentagedepletioninexcessofcostdepletionpercent | (19.90%)clf_IncomeTaxReconciliationTaxDeductionforpercentagedepletioninexcessofcostdepletionpercent | 21.70%clf_IncomeTaxReconciliationTaxDeductionforpercentagedepletioninexcessofcostdepletionpercent | 21.70%clf_IncomeTaxReconciliationTaxDeductionforpercentagedepletioninexcessofcostdepletionpercent
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount |  | 592.0 us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential |  | (10.2)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential |  | 65.2 us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential |
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent |  | (6.20%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential | (6.20%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential | (2.10%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential | (2.10%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential | (13.00%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential | (13.00%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Income not subject to tax |  | (46.5)clf_IncomeNotSubjectToTax |  | (106.6)clf_IncomeNotSubjectToTax |  | (108.0)clf_IncomeNotSubjectToTax |
Income not subject to tax percent |  | 0.50%clf_Incomenotsubjecttotaxpercent | 0.50%clf_Incomenotsubjecttotaxpercent | (21.80%)clf_Incomenotsubjecttotaxpercent | (21.80%)clf_Incomenotsubjecttotaxpercent | 21.50%clf_Incomenotsubjecttotaxpercent | 21.50%clf_Incomenotsubjecttotaxpercent
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount |  | 22.7 us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses |  | 20.5 us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses |  | 202.2 us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Percent |  | (0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses | (0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses | 4.20%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses | 4.20%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses | (40.30%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses | (40.30%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount |  | (43.6)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes |  | 5.6 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes |  | 7.3 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes |
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent |  | 0.50%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 0.50%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 1.10%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 1.10%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | (1.50%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | (1.50%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Effective Income Tax Rate Reconciliation, Tax Settlement, Amount |  | (343.3)us-gaap_IncomeTaxReconciliationTaxSettlements |  | 0 us-gaap_IncomeTaxReconciliationTaxSettlements |  | 0 us-gaap_IncomeTaxReconciliationTaxSettlements |
Effective Income Tax Rate Reconciliation, Tax Settlement, Percent |  | 3.60%us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlements | 3.60%us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlements | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlements | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlements | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlements | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlements
Income Tax Reconciliation Manufacturers Deduction |  | 0 clf_IncomeTaxReconciliationManufacturersDeduction |  | (7.9)clf_IncomeTaxReconciliationManufacturersDeduction |  | (4.7)clf_IncomeTaxReconciliationManufacturersDeduction |
Income Tax Reconciliation, Manufacturers Deduction Percent |  | 0.00%clf_IncomeTaxReconciliationManufacturersDeductionPercent | 0.00%clf_IncomeTaxReconciliationManufacturersDeductionPercent | (1.60%)clf_IncomeTaxReconciliationManufacturersDeductionPercent | (1.60%)clf_IncomeTaxReconciliationManufacturersDeductionPercent | 0.90%clf_IncomeTaxReconciliationManufacturersDeductionPercent | 0.90%clf_IncomeTaxReconciliationManufacturersDeductionPercent
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount |  | 1,660.6 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance |  | 73.0 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance |  | 634.5 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance |
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent |  | (17.30%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance | (17.30%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance | 14.90%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance | 14.90%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance | (126.50%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance | (126.50%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Tax Adjustments, Settlements, and Unusual Provisions |  | 0.2 us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions |  | 19.6 us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions |  | (14.8)us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions |
Tax Adjustments Settlements And Unusual Provisions Percent |  | 0.00%clf_TaxAdjustmentsSettlementsAndUnusualProvisionsPercent | 0.00%clf_TaxAdjustmentsSettlementsAndUnusualProvisionsPercent | 5.30%clf_TaxAdjustmentsSettlementsAndUnusualProvisionsPercent | 5.30%clf_TaxAdjustmentsSettlementsAndUnusualProvisionsPercent | 2.90%clf_TaxAdjustmentsSettlementsAndUnusualProvisionsPercent | 2.90%clf_TaxAdjustmentsSettlementsAndUnusualProvisionsPercent
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Percent |  | 0.10%us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes | (1040000000.00%)us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes | (3.60%)us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes | (1140000000.00%)us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes | 1.10%us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes | (570000000.00%)us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount |  | 16.5 us-gaap_IncomeTaxReconciliationOtherAdjustments |  | 2.9 us-gaap_IncomeTaxReconciliationOtherAdjustments |  | (1.6)us-gaap_IncomeTaxReconciliationOtherAdjustments |
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent |  | (0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments | (0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments | 0.60%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments | 0.60%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments | 0.40%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments | 0.40%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Income Tax Expense (Benefit) | $ (289.7)us-gaap_IncomeTaxExpenseBenefit | $ (1,302.0)us-gaap_IncomeTaxExpenseBenefit |  | $ 55.1 us-gaap_IncomeTaxExpenseBenefit |  | $ 255.9 us-gaap_IncomeTaxExpenseBenefit |
Income Tax Expense Benefit Percent |  | 13.60%clf_IncomeTaxExpenseBenefitPercent | 13.60%clf_IncomeTaxExpenseBenefitPercent | 11.30%clf_IncomeTaxExpenseBenefitPercent | 11.30%clf_IncomeTaxExpenseBenefitPercent | (51.00%)clf_IncomeTaxExpenseBenefitPercent | (51.00%)clf_IncomeTaxExpenseBenefitPercent

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