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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Statements Of Financial Performance Location Table) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Derivative [Line Items] |  |
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion) | $ (7.1)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet | $ (2.3)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | (6.3)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet | (12.8)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
Australian Dollar Foreign Exchange Contract Hedge Designation [Member] |  |
Derivative [Line Items] |  |
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion) | (2.6)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = clf_AustralianDollarForeignExchangeContractHedgeDesignationMember | 5.5 us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = clf_AustralianDollarForeignExchangeContractHedgeDesignationMember
Australian Dollar Foreign Exchange Contract Hedge Designation [Member] | Product Revenues [Member] |  |
Derivative [Line Items] |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | (6.3)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = clf_AustralianDollarForeignExchangeContractHedgeDesignationMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesRevenueGoodsNetMember | (9.1)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = clf_AustralianDollarForeignExchangeContractHedgeDesignationMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesRevenueGoodsNetMember
Australian Dollar Foreign Exchange Contracts Hedge Prior to De Designation [Member] |  |
Derivative [Line Items] |  |
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion) | (4.5)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = clf_AustralianDollarForeignExchangeContractsHedgePriortoDeDesignationMember | 0 us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = clf_AustralianDollarForeignExchangeContractsHedgePriortoDeDesignationMember
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | 0 us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = clf_AustralianDollarForeignExchangeContractsHedgePriortoDeDesignationMember | 0 us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = clf_AustralianDollarForeignExchangeContractsHedgePriortoDeDesignationMember
Canadian Dollar Foreign Exchange Contracts Hedge Designation [Member] |  |
Derivative [Line Items] |  |
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion) | 0 us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = clf_CanadianDollarForeignExchangeContractsHedgeDesignationMember | (7.8)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = clf_CanadianDollarForeignExchangeContractsHedgeDesignationMember
Canadian Dollar Foreign Exchange Contracts Hedge Designation [Member] | Cost of Sales [Member] |  |
Derivative [Line Items] |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | 0 us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = clf_CanadianDollarForeignExchangeContractsHedgeDesignationMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | (3.4)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = clf_CanadianDollarForeignExchangeContractsHedgeDesignationMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
Canadian Dollar Foreign Exchange Contracts Hedge Prior to De Designation [Member] |  |
Derivative [Line Items] |  |
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion) | 0 us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = clf_CanadianDollarForeignExchangeContractsHedgePriortoDeDesignationMember | 0 us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = clf_CanadianDollarForeignExchangeContractsHedgePriortoDeDesignationMember
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | $ 0 us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = clf_CanadianDollarForeignExchangeContractsHedgePriortoDeDesignationMember | $ (0.3)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = clf_CanadianDollarForeignExchangeContractsHedgePriortoDeDesignationMember

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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624177-113959 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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