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DISCONTINUED OPERATIONS Schedule of Disposal Groups, including Discontinued Operations, Assets and Liabilities - North American Coal (Details) (North American Coal [Member], USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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North American Coal [Member] |  |
Schedule of Disposal Groups, Including Discontinued Operations, Assets and Liabilities [Line Items] |  |
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net | $ 42.7 us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember | $ 44.8 us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember
Disposal Group, Including Discontinued Operation, Inventory | 59.7 us-gaap_DisposalGroupIncludingDiscontinuedOperationInventory1 / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember | 50.3 us-gaap_DisposalGroupIncludingDiscontinuedOperationInventory1 / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember
Disposal group, including Discontinued Operations, Prepaid Supplies | 28.4 clf_DisposalgroupincludingDiscontinuedOperationsPrepaidSupplies / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember | 28.2 clf_DisposalgroupincludingDiscontinuedOperationsPrepaidSupplies / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember
Disposal Group, Including Discontinued Operation, Other Assets, Current | 29.4 us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember | 20.5 us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment | 20.4 us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember | 94.7 us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent | 8.0 us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentAssets / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember | 35.7 us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentAssets / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember
Disposal Group, Including Discontinued Operation, Assets | 188.6 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember | 274.2 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember
Disposal Group, Including Discontinued Operation, Accounts Payable | 23.3 us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsPayable / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember | 22.4 us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsPayable / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember
Disposal Group, Including Discontinued Operation, Accrued Liabilities | 16.7 us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedLiabilities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember | 27.9 us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedLiabilities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember
Disposal Group, Including Discontinued Operation, Other Liabilities, Current | 34.7 us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentLiabilities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember | 31.0 us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentLiabilities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember
Disposal group, Including Discontinued Operation, Pension and Other Postretirement Obligations | 56.7 clf_DisposalgroupIncludingDiscontinuedOperationPensionandOtherPostretirementObligations / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember | 55.8 clf_DisposalgroupIncludingDiscontinuedOperationPensionandOtherPostretirementObligations / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember
Disposal Group Including Discontinued Operations Environmental Loss Contingency And Mine Reclamation And Closing Liability CurrentAnd Noncurrent | 34.4 clf_DisposalGroupIncludingDiscontinuedOperationsEnvironmentalLossContingencyAndMineReclamationAndClosingLiabilityCurrentAndNoncurrent / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember | 33.9 clf_DisposalGroupIncludingDiscontinuedOperationsEnvironmentalLossContingencyAndMineReclamationAndClosingLiabilityCurrentAndNoncurrent / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent | 31.9 us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember | 36.2 us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember
Disposal Group, Including Discontinued Operation, Liabilities | $ 197.7 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember | $ 207.2 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember

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