FAIR VALUE OF FINANCIAL INSTRUMENTS (Carrying Value And Fair Value Of Financial Instruments Disclosure) (Details) (USD $)
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Mar. 31, 2015
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Dec. 31, 2014
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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Debt Instrument, Face Amount |
$ 3,621,500,000us-gaap_DebtInstrumentFaceAmount
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$ 3,980,000,000us-gaap_DebtInstrumentFaceAmount
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Long-term debt: |
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Long-term Debt |
2,880,900,000us-gaap_LongTermDebt
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2,843,300,000us-gaap_LongTermDebt
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Total long-term debt, carrying value |
2,880,900,000us-gaap_LongTermDebtNoncurrent
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2,843,300,000us-gaap_LongTermDebtNoncurrent
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$700 Million 4.875% 2021 Senior Note [Member] |
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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Debt Instrument, Face Amount |
700,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = clf_SevenHundredMillionFourPointEightSevenFiveTwoThousandTwentyoneSeniorNoteMember
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700,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = clf_SevenHundredMillionFourPointEightSevenFiveTwoThousandTwentyoneSeniorNoteMember
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Long-term debt: |
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Long-term Debt |
422,900,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = clf_SevenHundredMillionFourPointEightSevenFiveTwoThousandTwentyoneSeniorNoteMember
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[1] |
689,500,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = clf_SevenHundredMillionFourPointEightSevenFiveTwoThousandTwentyoneSeniorNoteMember
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[1] |
Senior Notes - $1.3 Billion [Member] |
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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Debt Instrument, Face Amount |
1,300,000,000.0us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = clf_SeniorNotesOnePointThreeBillionMember
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1,300,000,000.0us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = clf_SeniorNotesOnePointThreeBillionMember
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$400 Million 5.90% 2020 Senior Notes [Member] |
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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Debt Instrument, Face Amount |
400,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = clf_FourHundredMillionFivePointNineZeroTwoThousandAndTwentySeniorNoteMember
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400,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = clf_FourHundredMillionFivePointNineZeroTwoThousandAndTwentySeniorNoteMember
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Long-term debt: |
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Long-term Debt |
325,700,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = clf_FourHundredMillionFivePointNineZeroTwoThousandAndTwentySeniorNoteMember
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[2] |
393,700,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = clf_FourHundredMillionFivePointNineZeroTwoThousandAndTwentySeniorNoteMember
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[2] |
$500 Million 3.95% 2018 Senior Notes [Member] |
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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Debt Instrument, Face Amount |
500,000,000.0us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionThreePointNineFiveTwoThousandEighteenSeniorNoteMember
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500,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionThreePointNineFiveTwoThousandEighteenSeniorNoteMember
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Long-term debt: |
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Long-term Debt |
433,800,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionThreePointNineFiveTwoThousandEighteenSeniorNoteMember
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[3] |
477,400,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionThreePointNineFiveTwoThousandEighteenSeniorNoteMember
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[3] |
Five hundred forty million Eight point two five Twenty twenty First Lien Notes [Member] |
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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Debt Instrument, Face Amount |
540,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = clf_FivehundredfortymillionEightpointtwofiveTwentytwentyFirstLienNotesMember
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0us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = clf_FivehundredfortymillionEightpointtwofiveTwentytwentyFirstLienNotesMember
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Long-term debt: |
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Long-term Debt |
503,500,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = clf_FivehundredfortymillionEightpointtwofiveTwentytwentyFirstLienNotesMember
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[3] |
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Five hundred Forty-four Million Seven Point Seven Five Twenty Twenty Second Lien Notes [Member] |
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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Debt Instrument, Face Amount |
544,200,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = clf_FivehundredFortyfourMillionSevenPointSevenFiveTwentyTwentySecondLienNotesMember
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0us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = clf_FivehundredFortyfourMillionSevenPointSevenFiveTwentyTwentySecondLienNotesMember
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Long-term debt: |
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Debt Instrument, Fair Value Disclosure |
397,200,000us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = clf_FivehundredFortyfourMillionSevenPointSevenFiveTwentyTwentySecondLienNotesMember
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Long-term Debt |
397,200,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = clf_FivehundredFortyfourMillionSevenPointSevenFiveTwentyTwentySecondLienNotesMember
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[3] |
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Revolving Credit Facility [Member] |
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Long-term debt: |
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Revolving loan, carrying value |
0us-gaap_LineOfCredit / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember
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[4] |
0us-gaap_LineOfCredit / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember
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[5] |
Interest Rate Swap [Member] |
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Long-term debt: |
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Fair Value Adjustment to Interest Rate Hedge |
2,700,000clf_FairValueAdjustmenttoInterestRateHedge / us-gaap_DebtInstrumentAxis = us-gaap_InterestRateSwapMember
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2,800,000clf_FairValueAdjustmenttoInterestRateHedge / us-gaap_DebtInstrumentAxis = us-gaap_InterestRateSwapMember
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Fair Value, Inputs, Level 2 [Member] |
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Long-term debt: |
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Total long-term debt, fair value |
2,081,700,000us-gaap_LongTermDebtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
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1,614,200,000us-gaap_LongTermDebtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
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Fair Value, Inputs, Level 2 [Member] | $700 Million 4.875% 2021 Senior Note [Member] |
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Long-term debt: |
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Debt Instrument, Fair Value Disclosure |
220,000,000us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = clf_SevenHundredMillionFourPointEightSevenFiveTwoThousandTwentyoneSeniorNoteMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
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367,300,000us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = clf_SevenHundredMillionFourPointEightSevenFiveTwoThousandTwentyoneSeniorNoteMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
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Fair Value, Inputs, Level 2 [Member] | Senior Notes - $1.3 Billion [Member] |
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Long-term debt: |
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Debt Instrument, Fair Value Disclosure |
425,800,000us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = clf_SeniorNotesOnePointThreeBillionMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
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704,000,000us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = clf_SeniorNotesOnePointThreeBillionMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
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Fair Value, Inputs, Level 2 [Member] | $400 Million 5.90% 2020 Senior Notes [Member] |
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Long-term debt: |
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Debt Instrument, Fair Value Disclosure |
190,500,000us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = clf_FourHundredMillionFivePointNineZeroTwoThousandAndTwentySeniorNoteMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
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228,100,000us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = clf_FourHundredMillionFivePointNineZeroTwoThousandAndTwentySeniorNoteMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
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Fair Value, Inputs, Level 2 [Member] | $500 Million 3.95% 2018 Senior Notes [Member] |
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Long-term debt: |
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Debt Instrument, Fair Value Disclosure |
337,900,000us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionThreePointNineFiveTwoThousandEighteenSeniorNoteMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
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312,000,000us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionThreePointNineFiveTwoThousandEighteenSeniorNoteMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
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Fair Value, Inputs, Level 2 [Member] | Five hundred forty million Eight point two five Twenty twenty First Lien Notes [Member] |
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Long-term debt: |
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Debt Instrument, Fair Value Disclosure |
507,600,000us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = clf_FivehundredfortymillionEightpointtwofiveTwentytwentyFirstLienNotesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
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0us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = clf_FivehundredfortymillionEightpointtwofiveTwentytwentyFirstLienNotesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
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Fair Value, Inputs, Level 2 [Member] | Five hundred Forty-four Million Seven Point Seven Five Twenty Twenty Second Lien Notes [Member] |
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Long-term debt: |
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Debt Instrument, Fair Value Disclosure |
397,200,000us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = clf_FivehundredFortyfourMillionSevenPointSevenFiveTwentyTwentySecondLienNotesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
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0us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = clf_FivehundredFortyfourMillionSevenPointSevenFiveTwentyTwentySecondLienNotesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
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Fair Value, Inputs, Level 2 [Member] | Revolving Credit Facility [Member] |
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Long-term debt: |
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Revolving loan, fair value |
0us-gaap_LinesOfCreditFairValueDisclosure / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
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0us-gaap_LinesOfCreditFairValueDisclosure / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
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Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] |
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Long-term debt: |
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Fair Value Adjustment to Interest Rate Hedge |
2,700,000clf_FairValueAdjustmenttoInterestRateHedge / us-gaap_DebtInstrumentAxis = us-gaap_InterestRateSwapMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
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2,800,000clf_FairValueAdjustmenttoInterestRateHedge / us-gaap_DebtInstrumentAxis = us-gaap_InterestRateSwapMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
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Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |
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Long-term debt: |
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Total long-term debt, carrying value |
2,880,900,000us-gaap_LongTermDebtNoncurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
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2,843,300,000us-gaap_LongTermDebtNoncurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
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Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | $700 Million 4.875% 2021 Senior Note [Member] |
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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Senior Notes, Noncurrent |
422,900,000us-gaap_SeniorLongTermNotes / us-gaap_DebtInstrumentAxis = clf_SevenHundredMillionFourPointEightSevenFiveTwoThousandTwentyoneSeniorNoteMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
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689,500,000us-gaap_SeniorLongTermNotes / us-gaap_DebtInstrumentAxis = clf_SevenHundredMillionFourPointEightSevenFiveTwoThousandTwentyoneSeniorNoteMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
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Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Senior Notes - $1.3 Billion [Member] |
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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Senior Notes, Noncurrent |
795,100,000us-gaap_SeniorLongTermNotes / us-gaap_DebtInstrumentAxis = clf_SeniorNotesOnePointThreeBillionMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
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1,279,900,000us-gaap_SeniorLongTermNotes / us-gaap_DebtInstrumentAxis = clf_SeniorNotesOnePointThreeBillionMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
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Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | $400 Million 5.90% 2020 Senior Notes [Member] |
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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Senior Notes, Noncurrent |
325,700,000us-gaap_SeniorLongTermNotes / us-gaap_DebtInstrumentAxis = clf_FourHundredMillionFivePointNineZeroTwoThousandAndTwentySeniorNoteMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
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393,700,000us-gaap_SeniorLongTermNotes / us-gaap_DebtInstrumentAxis = clf_FourHundredMillionFivePointNineZeroTwoThousandAndTwentySeniorNoteMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
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Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | $500 Million 3.95% 2018 Senior Notes [Member] |
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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Senior Notes, Noncurrent |
433,800,000us-gaap_SeniorLongTermNotes / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionThreePointNineFiveTwoThousandEighteenSeniorNoteMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
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477,400,000us-gaap_SeniorLongTermNotes / us-gaap_DebtInstrumentAxis = clf_FiveHundredMillionThreePointNineFiveTwoThousandEighteenSeniorNoteMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
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Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Five hundred forty million Eight point two five Twenty twenty First Lien Notes [Member] |
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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Senior Notes, Noncurrent |
503,500,000us-gaap_SeniorLongTermNotes / us-gaap_DebtInstrumentAxis = clf_FivehundredfortymillionEightpointtwofiveTwentytwentyFirstLienNotesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
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0us-gaap_SeniorLongTermNotes / us-gaap_DebtInstrumentAxis = clf_FivehundredfortymillionEightpointtwofiveTwentytwentyFirstLienNotesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
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Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Five hundred Forty-four Million Seven Point Seven Five Twenty Twenty Second Lien Notes [Member] |
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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Senior Notes, Noncurrent |
397,200,000us-gaap_SeniorLongTermNotes / us-gaap_DebtInstrumentAxis = clf_FivehundredFortyfourMillionSevenPointSevenFiveTwentyTwentySecondLienNotesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
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0us-gaap_SeniorLongTermNotes / us-gaap_DebtInstrumentAxis = clf_FivehundredFortyfourMillionSevenPointSevenFiveTwentyTwentySecondLienNotesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
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Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Revolving Credit Facility [Member] |
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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Senior Notes, Noncurrent |
0us-gaap_SeniorLongTermNotes / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
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0us-gaap_SeniorLongTermNotes / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
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Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] |
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Long-term debt: |
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Fair Value Adjustment to Interest Rate Hedge |
$ 2,700,000clf_FairValueAdjustmenttoInterestRateHedge / us-gaap_DebtInstrumentAxis = us-gaap_InterestRateSwapMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
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$ 2,800,000clf_FairValueAdjustmenttoInterestRateHedge / us-gaap_DebtInstrumentAxis = us-gaap_InterestRateSwapMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
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