Annual report pursuant to Section 13 and 15(d)

INCOME TAXES INCOME TAXES (Schedule of Effective Rate Reconciliation) (Details)

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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   $ 171.3us-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   62.3us-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   290.1clf_NonTaxableLossIncomeRelatedToNoncontrollingInterests   (1.5)clf_NonTaxableLossIncomeRelatedToNoncontrollingInterests   61.0clf_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   13.0clf_ImpactOfTaxLawChange   0clf_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   592.0us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential   (10.2)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential   65.2us-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   22.7us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses   20.5us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses   202.2us-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   5.6us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes   7.3us-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   0us-gaap_IncomeTaxReconciliationTaxSettlements   0us-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   0clf_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   1,660.6us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance   73.0us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance   634.5us-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   0.2us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions   19.6us-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   16.5us-gaap_IncomeTaxReconciliationOtherAdjustments   2.9us-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   $ 55.1us-gaap_IncomeTaxExpenseBenefit   $ 255.9us-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