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SHAREHOLDERS' EQUITY Details of Accumulated Other Comprehensive Income (Loss) Components (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | |||||||
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Mar. 31, 2015
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Mar. 31, 2014
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| Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] | Ìý | Ìý | ||||||
| Derivative Instruments, (Gain) Loss Reclassified from Accumulated OCI into Income, Effective Portion, Net | $ (6.3)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet | $ (12.8)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet | ||||||
| Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 195.5us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax | 16.1us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax | ||||||
| Accumulated Defined Benefit Plans Adjustment [Member] | Ìý | Ìý | ||||||
| Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] | Ìý | Ìý | ||||||
| Defined Benefit Plan, Amortization of Prior Service Cost (Credit) |
(0.3)us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
[1] |
(0.3)us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
[1] | ||||
| Defined Benefit Plan, Amortization of Gains (Losses) |
8.5us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
[1] |
4.8us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
[1] | ||||
| Defined Benefit Plan, Curtailments |
0.3us-gaap_DefinedBenefitPlanCurtailments / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
[1] |
0.3us-gaap_DefinedBenefitPlanCurtailments / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
[1] | ||||
| Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, before Tax |
8.5us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
4.8us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
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| Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax |
0us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
(1.6)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
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| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |
8.5us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
3.2us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
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| Realized Gain (Loss) on Marketable Securities [Member] | Ìý | Ìý | ||||||
| Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] | Ìý | Ìý | ||||||
| Marketable Securities, Realized Gain (Loss) |
0us-gaap_MarketableSecuritiesRealizedGainLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_RealizedGainLossonMarketableSecuritiesMember |
0.1us-gaap_MarketableSecuritiesRealizedGainLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_RealizedGainLossonMarketableSecuritiesMember |
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| Accumulated Other-than-Temporary Impairment [Member] | Ìý | Ìý | ||||||
| Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] | Ìý | Ìý | ||||||
| Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, before Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities |
(2.0)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedOtherThanTemporaryImpairmentMember |
0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedOtherThanTemporaryImpairmentMember |
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| Realized Gain (Loss) on Marketable Securities and Other than Temporary Impairment [Member] | Ìý | Ìý | ||||||
| Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] | Ìý | Ìý | ||||||
| Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities and Impairment on Securities Arising During Period, before tax |
(2.0)clf_OtherComprehensiveIncomeLossRealizedHoldingGainLossonSecuritiesandImpairmentonSecuritiesArisingDuringPeriodbeforetax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_RealizedGainLossonMarketableSecuritiesandOtherthanTemporaryImpairmentMember |
0.1clf_OtherComprehensiveIncomeLossRealizedHoldingGainLossonSecuritiesandImpairmentonSecuritiesArisingDuringPeriodbeforetax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_RealizedGainLossonMarketableSecuritiesandOtherthanTemporaryImpairmentMember |
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| Other Comprehensive Income (Loss), Realized Holding Gain (Loss) on Securities and Impairment on Securities Arising During Period, Tax |
0clf_OtherComprehensiveIncomeLossRealizedHoldingGainLossonSecuritiesandImpairmentonSecuritiesArisingDuringPeriodTax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_RealizedGainLossonMarketableSecuritiesandOtherthanTemporaryImpairmentMember |
0clf_OtherComprehensiveIncomeLossRealizedHoldingGainLossonSecuritiesandImpairmentonSecuritiesArisingDuringPeriodTax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_RealizedGainLossonMarketableSecuritiesandOtherthanTemporaryImpairmentMember |
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| Other Comprehensive Income (Loss), Realized Holding Gain (Loss) on Securities and Impairment on Securities Arising During Period, net of tax |
(2.0)clf_OtherComprehensiveIncomeLossRealizedHoldingGainLossonSecuritiesandImpairmentonSecuritiesArisingDuringPeriodnetoftax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_RealizedGainLossonMarketableSecuritiesandOtherthanTemporaryImpairmentMember |
0.1clf_OtherComprehensiveIncomeLossRealizedHoldingGainLossonSecuritiesandImpairmentonSecuritiesArisingDuringPeriodnetoftax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_RealizedGainLossonMarketableSecuritiesandOtherthanTemporaryImpairmentMember |
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| Foreign Currency Translation Adjustment [Member] | Ìý | Ìý | ||||||
| Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] | Ìý | Ìý | ||||||
| Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax |
182.7us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_ForeignCurrencyTranslationAdjustmentMember |
[2] |
0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_ForeignCurrencyTranslationAdjustmentMember |
[2] | ||||
| Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax |
0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_ForeignCurrencyTranslationAdjustmentMember |
0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_ForeignCurrencyTranslationAdjustmentMember |
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| Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax |
182.7us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_ForeignCurrencyTranslationAdjustmentMember |
0us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_ForeignCurrencyTranslationAdjustmentMember |
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| Realized Gain Loss On Derivatives [Member] | Ìý | Ìý | ||||||
| Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] | Ìý | Ìý | ||||||
| (Gain) Loss on Derivative Instruments, Net, Pretax |
9.0us-gaap_GainLossOnDerivativeInstrumentsNetPretax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_RealizedGainLossOnDerivativesMember |
18.5us-gaap_GainLossOnDerivativeInstrumentsNetPretax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_RealizedGainLossOnDerivativesMember |
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| Tax on Derivative Instruments Gain/Loss Reclassified from Accumulated OCI in to Earnings |
(2.7)clf_Taxonderivativeinstrumentsgainlossreclassifiedfromaccumulatedociintoearnings / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_RealizedGainLossOnDerivativesMember |
(5.7)clf_Taxonderivativeinstrumentsgainlossreclassifiedfromaccumulatedociintoearnings / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_RealizedGainLossOnDerivativesMember |
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| Amount of (gain)/loss recognized in income on derivative |
6.3us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_RealizedGainLossOnDerivativesMember |
12.8us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_RealizedGainLossOnDerivativesMember |
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| Australian Hedge Contracts [Member] | Realized Gain Loss On Derivatives [Member] | Ìý | Ìý | ||||||
| Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] | Ìý | Ìý | ||||||
| Derivative Instruments, (Gain) Loss Reclassified from Accumulated OCI into Income, Effective Portion, Net |
9.0us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = clf_AustralianHedgeContractsMember / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_RealizedGainLossOnDerivativesMember |
13.0us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = clf_AustralianHedgeContractsMember / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_RealizedGainLossOnDerivativesMember |
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| Canadian Hedge Contracts [Member] | Realized Gain Loss On Derivatives [Member] | Ìý | Ìý | ||||||
| Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] | Ìý | Ìý | ||||||
| Derivative Instruments, (Gain) Loss Reclassified from Accumulated OCI into Income, Effective Portion, Net |
$ 0us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = clf_CanadianHedgeContractsMember / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_RealizedGainLossOnDerivativesMember |
$ 5.5us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = clf_CanadianHedgeContractsMember / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_RealizedGainLossOnDerivativesMember |
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- Definition
Other Comprehensive Income (Loss), Realized Holding Gain (Loss) on Securities and Impairment on Securities Arising During Period, before tax No definition available.
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| X | ||||||||||
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- Definition
Other Comprehensive Income (Loss), Realized Holding Gain (Loss) on Securities and Impairment on Securities Arising During Period, net of tax No definition available.
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- Definition
Other Comprehensive Income (Loss), Realized Holding Gain (Loss) on Securities and Impairment on Securities Arising During Period, Tax No definition available.
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- Definition
Tax On Derivative Instruments Gain Loss Reclassified From Accumulated OCI Into Earnings No definition available.
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- Definition
The amount of gains or losses recognized in net periodic benefit cost. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The amount of decrease that is related to an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
This item represents the total realized gain (loss) included in earnings for the period as a result of selling marketable securities categorized as trading, available-for-sale, or held-to-maturity. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of tax expense (benefit) related to (increase) decrease in the value of the projected benefit obligation related to a change in an actuarial assumption and increase (decrease) in the value of the plan assets resulting from experience different from that assumed, that has not been recognized in net periodic benefit (cost) credit. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before tax, after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of tax expense (benefit), after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before tax of reclassification adjustment from accumulated other comprehensive income (loss) for actuarial gain (loss) related to pension and other postretirement benefit plans. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount after tax of reclassification adjustment from accumulated other comprehensive income (loss) for actuarial gain (loss) related to pension and other postretirement benefit plans. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before tax of other than temporary impairment (OTTI) on investment in available-for-sale debt security, recognized in other comprehensive loss. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount after tax of reclassification adjustments of other comprehensive income (loss). No definition available.
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