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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) | 12 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended |  |  | 3 Months Ended | 12 Months Ended |  |  | 12 Months Ended |  |  |  |  | 12 Months Ended
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Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2014 Northern Lands [Member] USD ($) | Dec. 31, 2013 Amapa [Member] USD ($) | Dec. 31, 2012 Amapa [Member] USD ($) | Dec. 31, 2014 U.S. Iron Ore [Member] USD ($) Facility T | Dec. 31, 2013 U.S. Iron Ore [Member] USD ($) T | Dec. 31, 2012 U.S. Iron Ore [Member] USD ($) | Dec. 31, 2014 Asia Pacific [Member] USD ($) | Dec. 31, 2014 Asia Pacific Iron Ore [Member] USD ($) Facility | Dec. 31, 2013 Asia Pacific Iron Ore [Member] USD ($) | Dec. 31, 2012 Asia Pacific Iron Ore [Member] USD ($) | Dec. 31, 2013 Asia Pacific Iron Ore [Member] Cockatoo [Member] USD ($) | Dec. 31, 2013 Asia Pacific Iron Ore [Member] Cockatoo [Member] AUD | Dec. 31, 2013 Other Segment [Member] USD ($) | Dec. 31, 2014 Other Segment [Member] USD ($) | Dec. 31, 2012 Other Segment [Member] USD ($) | Dec. 31, 2014 North American Coal [Member] USD ($) | Dec. 31, 2013 North American Coal [Member] USD ($) | Dec. 31, 2012 North American Coal [Member] USD ($) | Dec. 31, 2014 Eastern Canadian Iron Ore [Member] USD ($) Facility | Dec. 31, 2013 Eastern Canadian Iron Ore [Member] USD ($) | Dec. 31, 2012 Eastern Canadian Iron Ore [Member] USD ($) | Dec. 31, 2013 Cliffs Chromite Ontario and Cliffs Chromite Far North [Member] USD ($) | Dec. 31, 2013 CQIM Reporting Unit [Member] USD ($) | Dec. 31, 2014 Wabush [Member] USD ($) | Dec. 31, 2013 Wabush [Member] USD ($) | Dec. 31, 2013 Sonoma [Member] Asia Pacific Coal [Member] AUD | Jul. 10, 2012 Sonoma [Member] Asia Pacific Coal [Member] | Dec. 31, 2014 Empire [Member] | Dec. 31, 2014 Big Daddy Chromite Deposit [Member] | Dec. 31, 2014 CLCC [Member] | Dec. 31, 2014 Wabush [Member] | Dec. 31, 2013 Bloom Lake [Member] USD ($) | Dec. 31, 2013 Bloom Lake [Member] USD ($) | Dec. 31, 2012 Bloom Lake [Member] USD ($) | Dec. 31, 2011 Bloom Lake [Member] USD ($) | Dec. 31, 2014 Bloom Lake [Member] | Dec. 31, 2013 Investments in Ventures [Member] Amapa [Member] | Dec. 31, 2014 Low Volatile Metallurgical Coal Mines [Member] North American Coal [Member] Facility | Dec. 31, 2014 High volatile metallurgical coal mines [Member] North American Coal [Member] Facility | Dec. 31, 2014 Thermal Coal Mines [Member] North American Coal [Member] Facility | Dec. 31, 2014 Take or Pay Contracts [Member] USD ($) | Dec. 31, 2013 Take or Pay Contracts [Member] USD ($) | Dec. 31, 2014 Customer Supplemental Payments [Member] U.S. Iron Ore [Member] USD ($) | Dec. 31, 2013 Customer Supplemental Payments [Member] U.S. Iron Ore [Member] USD ($) | Dec. 31, 2014 Wisco [Member] | Dec. 31, 2013 Wisco [Member] USD ($) | Dec. 31, 2013 Bloom Lake [Member] USD ($) | Dec. 31, 2014 Minimum [Member] Other Machinery and Equipment [Member] | Dec. 31, 2014 Minimum [Member] Electric Power Facilities [Member] | Dec. 31, 2014 Minimum [Member] Land Improvements [Member] | Dec. 31, 2014 Minimum [Member] Equipment [Member] | Dec. 31, 2014 Maximum [Member] Other Machinery and Equipment [Member] | Dec. 31, 2014 Maximum [Member] Electric Power Facilities [Member] | Dec. 31, 2014 Maximum [Member] Land Improvements [Member] | Dec. 31, 2014 Maximum [Member] Equipment [Member]
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tangible Asset Impairment Charges | $ 8,839,000,000 us-gaap_TangibleAssetImpairmentCharges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 145,100,000 us-gaap_TangibleAssetImpairmentCharges / clf_ReportingUnitAxis = clf_WabushMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 140,100,000 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / clf_ReportingUnitAxis = clf_WabushMember | 49,900,000 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / clf_ReportingUnitAxis = clf_WabushMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventory Valuation Reserves | 68,200,000 us-gaap_InventoryValuationReserves | 63,400,000 us-gaap_InventoryValuationReserves |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Of Mines |  |  |  |  |  |  | 5 clf_NumberOfMines / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember |  |  |  | 1 clf_NumberOfMines / us-gaap_StatementBusinessSegmentsAxis = clf_AsiaPacificIronOreMember |  |  |  |  |  |  |  |  |  |  | 2 clf_NumberOfMines / us-gaap_StatementBusinessSegmentsAxis = clf_EasternCanadianIronOreMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 clf_NumberOfMines / clf_ProductSegmentAxis = clf_LowVolatileMetallurgicalCoalMinesMember / us-gaap_StatementBusinessSegmentsAxis = clf_NorthAmericanCoalMember | 2 clf_NumberOfMines / clf_ProductSegmentAxis = clf_HighvolatilemetallurgicalcoalminesMember / us-gaap_StatementBusinessSegmentsAxis = clf_NorthAmericanCoalMember | 1 clf_NumberOfMines / clf_ProductSegmentAxis = clf_ThermalCoalMinesMember / us-gaap_StatementBusinessSegmentsAxis = clf_NorthAmericanCoalMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trading Day Window Determining Number of Common Shares Issuable on Conversion | 20 clf_TradingDayWindowDeterminingNumberOfCommonSharesIssuableOnConversion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depositary Share Interest in a Share of 7% Series A Mandatory Convertible Preferred Stock, Class A | 0.025 clf_DepositaryShareInterestInShareOf7SeriesMandatoryConvertiblePreferredStockClassA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current Fiscal Year End Date | --12-31 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 29,300,000 us-gaap_DeferredRevenue / us-gaap_DeferredRevenueArrangementTypeAxis = clf_TakeOrPayContractsMember | 13,500,000 us-gaap_DeferredRevenue / us-gaap_DeferredRevenueArrangementTypeAxis = clf_TakeOrPayContractsMember | 102,800,000 us-gaap_DeferredRevenue / us-gaap_DeferredRevenueArrangementTypeAxis = clf_CustomerSupplementalPaymentsMember / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember | 115,600,000 us-gaap_DeferredRevenue / us-gaap_DeferredRevenueArrangementTypeAxis = clf_CustomerSupplementalPaymentsMember / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember |  |  |  |  |  |  |  |  |  |  |
Ownership Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45.00%clf_PercentageOfOwnershipInterests / clf_InvesteeNameAxis = clf_SonomaMember / us-gaap_StatementBusinessSegmentsAxis = clf_AsiaPacificCoalMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in Subsidiary or Equity Method Investee Percentage Ownership Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.80%clf_IncreaseinSubsidiaryorEquityMethodInvesteePercentageOwnershipAcquired / us-gaap_BusinessAcquisitionAxis = clf_WiscoMember |  |  |  |  |  |  |  |  |
Units Issued by CQIM to Bloom Lake for Acquisition of Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 457,556 clf_UnitsIssuedbyCQIMtoBloomLakeforAcquisitionofNoncontrollingInterest / us-gaap_BusinessAcquisitionAxis = clf_WiscoMember |  |  |  |  |  |  |  |  |
Ownership interest, equity method investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_BalanceSheetLocationAxis = clf_InvestmentsinVenturesMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = clf_AmapaMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total percentage of Amapa sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%clf_TotalPercentageOfAmapaSold / us-gaap_BalanceSheetLocationAxis = clf_InvestmentsinVenturesMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = clf_AmapaMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Other than Temporary Impairment | 0 us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment | 0 us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment | (365,400,000)us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment | 21,500,000 us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = clf_OtherEquityInvesteesMember | 67,600,000 us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = clf_AmapaMember | (365,400,000)us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = clf_AmapaMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of economic interest (in AUD) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.00 us-gaap_ProceedsFromDivestitureOfInterestInJointVenture / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = clf_CockatooMember / us-gaap_StatementBusinessSegmentsAxis = clf_AsiaPacificIronOreMember |  |  |  |  |  |  |  |  |  |  |  |  |  | 141,000,000 us-gaap_ProceedsFromDivestitureOfInterestInJointVenture / clf_InvesteeNameAxis = clf_SonomaMember / us-gaap_StatementBusinessSegmentsAxis = clf_AsiaPacificCoalMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated rehabilitation costs |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,600,000 clf_EstimatedRehabilitationCosts / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = clf_CockatooMember / us-gaap_StatementBusinessSegmentsAxis = clf_AsiaPacificIronOreMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 2,000,000 us-gaap_Goodwill | 74,500,000 us-gaap_Goodwill | 167,400,000 us-gaap_Goodwill |  |  |  | 2,000,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember | 2,000,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember | 2,000,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember |  | 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = clf_AsiaPacificIronOreMember | 72,500,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = clf_AsiaPacificIronOreMember | 84,500,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = clf_AsiaPacificIronOreMember |  |  | 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = clf_OtherSegmentMember | 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = clf_OtherSegmentMember | 80,900,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = clf_OtherSegmentMember |  |  |  | 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = clf_EasternCanadianIronOreMember | 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = clf_EasternCanadianIronOreMember | 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = clf_EasternCanadianIronOreMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reimbursement Revenue | 392,900,000 us-gaap_ReimbursementRevenue | 344,800,000 us-gaap_ReimbursementRevenue | 351,800,000 us-gaap_ReimbursementRevenue |  |  |  | 271,000,000 us-gaap_ReimbursementRevenue / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember | 259,500,000 us-gaap_ReimbursementRevenue / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember | 250,800,000 us-gaap_ReimbursementRevenue / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember | 6,900,000 us-gaap_ReimbursementRevenue / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AsiaPacificMember |  |  |  |  |  |  |  |  | 115,000,000 us-gaap_ReimbursementRevenue / us-gaap_StatementBusinessSegmentsAxis = clf_NorthAmericanCoalMember | 85,800,000 us-gaap_ReimbursementRevenue / us-gaap_StatementBusinessSegmentsAxis = clf_NorthAmericanCoalMember | 101,000,000 us-gaap_ReimbursementRevenue / us-gaap_StatementBusinessSegmentsAxis = clf_NorthAmericanCoalMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable | 8,100,000 us-gaap_AllowanceForDoubtfulAccountsReceivable | 8,100,000 us-gaap_AllowanceForDoubtfulAccountsReceivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for Doubtful Accounts | 0 us-gaap_ProvisionForDoubtfulAccounts | 0 us-gaap_ProvisionForDoubtfulAccounts | 9,000,000 us-gaap_ProvisionForDoubtfulAccounts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quantity Of Finished Goods |  |  |  |  |  |  | 1,400,000 clf_QuantityOfFinishedGoods / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember | 1,200,000 clf_QuantityOfFinishedGoods / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Policy, Percentage of Amount Permitted to be Hedged | 75.00%clf_DerivativePolicyPercentageOfAmountPermittedToBeHedged |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Policy, Minimum Percentage of Amount Permitted to be Hedged for Derivatives with Periods of up to Twelve Months | 40.00%clf_DerivativePolicyMinimumPercentageOfAmountPermittedToBeHedgedForDerivativesWithPeriodsOfUpToTwelveMonths |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Policy, Minimum Percentage of Amount Permitted to be Hedged for Derivatives with Periods of up to Fifteen Months | 10.00%clf_DerivativePolicyMinimumPercentageOfAmountPermittedToBeHedgedForDerivativesWithPeriodsOfUpToFifteenMonths |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Revenue, Current |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,800,000 us-gaap_DeferredRevenueCurrent / us-gaap_DeferredRevenueArrangementTypeAxis = clf_CustomerSupplementalPaymentsMember / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember | 12,800,000 us-gaap_DeferredRevenueCurrent / us-gaap_DeferredRevenueArrangementTypeAxis = clf_CustomerSupplementalPaymentsMember / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember |  |  |  |  |  |  |  |  |  |  |
Deferred Revenue, Noncurrent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90,000,000 us-gaap_DeferredRevenueNoncurrent / us-gaap_DeferredRevenueArrangementTypeAxis = clf_CustomerSupplementalPaymentsMember / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember | 102,800,000 us-gaap_DeferredRevenueNoncurrent / us-gaap_DeferredRevenueArrangementTypeAxis = clf_CustomerSupplementalPaymentsMember / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember |  |  |  |  |  |  |  |  |  |  |
Asset Impairment Charges | 9,029,900,000 us-gaap_AssetImpairmentCharges | 250,800,000 us-gaap_AssetImpairmentCharges | 1,049,900,000 us-gaap_AssetImpairmentCharges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 154,600,000 us-gaap_AssetImpairmentCharges / clf_ReportingUnitAxis = clf_WabushMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 79.00%us-gaap_MinorityInterestOwnershipPercentageByParent / clf_NameofOperationAxis = clf_EmpireMember | 70.00%us-gaap_MinorityInterestOwnershipPercentageByParent / clf_NameofOperationAxis = clf_BigDaddyChromiteDepositMember | 100.00%us-gaap_MinorityInterestOwnershipPercentageByParent / clf_NameofOperationAxis = clf_ClccMember | 100.00%us-gaap_MinorityInterestOwnershipPercentageByParent / clf_NameofOperationAxis = clf_WabushMember |  |  | 75.00%us-gaap_MinorityInterestOwnershipPercentageByParent / clf_NameofOperationAxis = clf_BloomLakeMember |  | 82.80%us-gaap_MinorityInterestOwnershipPercentageByParent / clf_NameofOperationAxis = clf_BloomLakeMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary Or Equity Method Investee Percentage Ownership Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17.152%clf_SubsidiaryOrEquityMethodInvesteePercentageOwnershipAcquired / us-gaap_BusinessAcquisitionAxis = clf_WiscoMember |  |  |  |  |  |  |  |  |  |
Increase/Decrease in Equity for WISCO/Bloom Lake through Acquisition of Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 314,800,000 clf_DecreaseinEquityforWISCOthroughCliffsAcquisitionofNoncontrollingInterest / us-gaap_BusinessAcquisitionAxis = clf_WiscoMember |  |  |  |  |  |  |  |  |
Increase to Cliffs' Shareholders Equity through Acquisition of Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 314,800,000 clf_IncreasetoCliffsShareholdersEquitythroughAcquisitionofNoncontrollingInterest / clf_MineLocationAxis = clf_BloomLakeMember |  |  |  |  |  |  |  |
Immaterial Error Adjustment Related to Bloom Lake Purchase Price Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45,100,000 clf_ImmaterialErrorAdjustmentRelatedtoBloomLakePurchasePriceAcquisition / clf_NameofOperationAxis = clf_BloomLakeMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in Basic EPS for Immaterial Error Adjustment Related to Bloom Lake Purchase Price Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.29 clf_ChangeinBasicEPSforImmaterialErrorAdjustmentRelatedtoBloomLakePurchasePriceAcquisition / clf_NameofOperationAxis = clf_BloomLakeMember | $ 0.30 clf_ChangeinBasicEPSforImmaterialErrorAdjustmentRelatedtoBloomLakePurchasePriceAcquisition / clf_NameofOperationAxis = clf_BloomLakeMember | $ 0 clf_ChangeinBasicEPSforImmaterialErrorAdjustmentRelatedtoBloomLakePurchasePriceAcquisition / clf_NameofOperationAxis = clf_BloomLakeMember | $ 0.07 clf_ChangeinBasicEPSforImmaterialErrorAdjustmentRelatedtoBloomLakePurchasePriceAcquisition / clf_NameofOperationAxis = clf_BloomLakeMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in Diluted EPS for Immaterial Error Adjustment Related to Bloom Lake Purchase Price Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.26 clf_ChangeinDilutedEPSforImmaterialErrorAdjustmentRelatedtoBloomLakePurchasePriceAcquisition / clf_NameofOperationAxis = clf_BloomLakeMember | $ 0.25 clf_ChangeinDilutedEPSforImmaterialErrorAdjustmentRelatedtoBloomLakePurchasePriceAcquisition / clf_NameofOperationAxis = clf_BloomLakeMember | $ 0.07 clf_ChangeinDilutedEPSforImmaterialErrorAdjustmentRelatedtoBloomLakePurchasePriceAcquisition / clf_NameofOperationAxis = clf_BloomLakeMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Impairment Loss | 73,500,000 us-gaap_GoodwillImpairmentLoss | 80,900,000 us-gaap_GoodwillImpairmentLoss |  |  |  |  | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember |  |  | 73,500,000 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = clf_AsiaPacificIronOreMember | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = clf_AsiaPacificIronOreMember |  |  |  | (80,900,000)us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = clf_OtherSegmentMember |  |  |  |  |  | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = clf_EasternCanadianIronOreMember | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = clf_EasternCanadianIronOreMember |  | 80,900,000 us-gaap_GoodwillImpairmentLoss / clf_ReportingUnitAxis = clf_CliffsChromiteOntarioandCliffsChromiteFarNorthMember | 997,300,000 us-gaap_GoodwillImpairmentLoss / clf_ReportingUnitAxis = clf_CqimReportingUnitMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years | 10 years | 20 years | 3 years | 45 years | 45 years | 45 years | 20 years
Impairment of Intangible Assets (Excluding Goodwill) | $ 15,500,000 us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill | $ 14,500,000 us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,500,000 us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill / clf_ReportingUnitAxis = clf_WabushMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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