ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) Details of Accumulated Other Comprehensive Income (Loss) Components (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||||||
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Details of Accumulated Other Comprehensive Income (Loss) Components [Line Items] | |||||||
Derivative Instruments, (Gain) Loss Reclassified from Accumulated OCI into Income, Effective Portion, Net | $ (31.0)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet | $ (22.1)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet | $ 18.1us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet | ||||
Total Amount Reclassified from Accumulated Other Comprehensive Income (Loss) During the Period | 33.3clf_TotalAmountReclassifiedFromAccumulatedOtherComprehensiveIncomeLossDuringPeriod | 53.6clf_TotalAmountReclassifiedFromAccumulatedOtherComprehensiveIncomeLossDuringPeriod | |||||
Accumulated Defined Benefit Plans Adjustment [Member] | |||||||
Details of Accumulated Other Comprehensive Income (Loss) Components [Line Items] | |||||||
Amortization of prior service (cost) credit |
0.9us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
[1] |
0.6us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
[1] | |||
Defined Benefit Plan, Amortization of Gains (Losses) |
19.1us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
[1] |
41.4us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
[1] | |||
Defined Benefit Plan, Curtailments |
(5.0)us-gaap_DefinedBenefitPlanCurtailments / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
0us-gaap_DefinedBenefitPlanCurtailments / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
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Defined Benefit Plan, Special Termination Benefits |
3.4us-gaap_DefinedBenefitPlanSpecialTerminationBenefits / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
0us-gaap_DefinedBenefitPlanSpecialTerminationBenefits / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
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Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, before Tax |
16.6us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
40.8us-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 |
(5.8)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
(14.3)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
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Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |
10.8us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
26.5us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
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Unrealized Gain (Loss) on Marketable Securities [Member] [Member] | |||||||
Details of Accumulated Other Comprehensive Income (Loss) Components [Line Items] | |||||||
Marketable Securities, Unrealized Gain (Loss) |
(11.4)us-gaap_MarketableSecuritiesUnrealizedGainLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_UnrealizedGainLossonMarketableSecuritiesMemberMember |
(0.2)us-gaap_MarketableSecuritiesUnrealizedGainLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_UnrealizedGainLossonMarketableSecuritiesMemberMember |
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Accumulated Other-than-Temporary Impairment [Member] | |||||||
Details of Accumulated Other Comprehensive Income (Loss) Components [Line Items] | |||||||
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, before Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities |
(0.5)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedOtherThanTemporaryImpairmentMember |
5.3us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedOtherThanTemporaryImpairmentMember |
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Unrealized Gain (Loss) on Marketable Securities and Other than Temporary Impairment [Member] [Member] | |||||||
Details of Accumulated Other Comprehensive Income (Loss) Components [Line Items] | |||||||
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax |
(11.9)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_UnrealizedGainLossonMarketableSecuritiesandOtherthanTemporaryImpairmentMember |
5.1us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_UnrealizedGainLossonMarketableSecuritiesandOtherthanTemporaryImpairmentMember |
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Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax |
3.4us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_UnrealizedGainLossonMarketableSecuritiesandOtherthanTemporaryImpairmentMember |
(0.1)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_UnrealizedGainLossonMarketableSecuritiesandOtherthanTemporaryImpairmentMember |
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Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax |
(8.5)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_UnrealizedGainLossonMarketableSecuritiesandOtherthanTemporaryImpairmentMember |
5.0us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_UnrealizedGainLossonMarketableSecuritiesandOtherthanTemporaryImpairmentMember |
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Unrealized Gain Loss On Derivatives [Member] | |||||||
Details of Accumulated Other Comprehensive Income (Loss) Components [Line Items] | |||||||
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax |
45.6us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_UnrealizedGainLossOnDerivativesMember |
32.3us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_UnrealizedGainLossOnDerivativesMember |
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Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax |
(14.6)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_UnrealizedGainLossOnDerivativesMember |
(10.2)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_UnrealizedGainLossOnDerivativesMember |
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Unrealized net gain (loss) on derivative financial instruments, net of tax |
31.0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_UnrealizedGainLossOnDerivativesMember |
22.1us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_UnrealizedGainLossOnDerivativesMember |
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Unrealized Gain Loss On Derivatives [Member] | Australian Hedge Contracts [Member] | |||||||
Details of Accumulated Other Comprehensive Income (Loss) Components [Line Items] | |||||||
Derivative Instruments, (Gain) Loss Reclassified from Accumulated OCI into Income, Effective Portion, Net |
18.9us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = clf_AustralianHedgeContractsMember / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_UnrealizedGainLossOnDerivativesMember |
17.0us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = clf_AustralianHedgeContractsMember / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_UnrealizedGainLossOnDerivativesMember |
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Unrealized Gain Loss On Derivatives [Member] | Canadian Hedge Contracts [Member] | |||||||
Details of Accumulated Other Comprehensive Income (Loss) Components [Line Items] | |||||||
Derivative Instruments, (Gain) Loss Reclassified from Accumulated OCI into Income, Effective Portion, Net |
$ 26.7us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = clf_CanadianHedgeContractsMember / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_UnrealizedGainLossOnDerivativesMember |
$ 15.3us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = clf_CanadianHedgeContractsMember / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = clf_UnrealizedGainLossOnDerivativesMember |
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- Definition
Total Amount Reclassified from Accumulated Other Comprehensive Income (Loss) During the Period 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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The amount of increase related to special termination benefits offered to and accepted by employees in connection with their termination of employment that are only offered for a short period of time. A situation involving termination benefits may also involve a curtailment. 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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The aggregate net change in the difference between the fair value and the carrying value, or in the comparative fair values, of marketable securities categorized as trading held at each balance sheet date, that was included in earnings for the period, which may have arisen from (a) securities classified as trading, (b) the unrealized holding gain (loss) on held-to-maturity securities transferred to the trading security category, and (c) the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) on available-for-sale securities transferred to trading securities during the period. 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 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 increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of tax expense (benefit), before reclassification adjustments, related to increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before tax and reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of tax expense (benefit) before reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities. 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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