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
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Dec. 31, 2014
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North American Coal [Member]
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Schedule of Disposal Groups, Including Discontinued Operations, Assets and Liabilities [Line Items] | ||
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net |
$ 42.7us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember |
$ 44.8us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember |
Disposal Group, Including Discontinued Operation, Inventory |
59.7us-gaap_DisposalGroupIncludingDiscontinuedOperationInventory1 / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember |
50.3us-gaap_DisposalGroupIncludingDiscontinuedOperationInventory1 / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember |
Disposal group, including Discontinued Operations, Prepaid Supplies |
28.4clf_DisposalgroupincludingDiscontinuedOperationsPrepaidSupplies / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember |
28.2clf_DisposalgroupincludingDiscontinuedOperationsPrepaidSupplies / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember |
Disposal Group, Including Discontinued Operation, Other Assets, Current |
29.4us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember |
20.5us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember |
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment |
20.4us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember |
94.7us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember |
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent |
8.0us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentAssets / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember |
35.7us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentAssets / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember |
Disposal Group, Including Discontinued Operation, Assets |
188.6us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember |
274.2us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember |
Disposal Group, Including Discontinued Operation, Accounts Payable |
23.3us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsPayable / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember |
22.4us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsPayable / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember |
Disposal Group, Including Discontinued Operation, Accrued Liabilities |
16.7us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedLiabilities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember |
27.9us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedLiabilities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember |
Disposal Group, Including Discontinued Operation, Other Liabilities, Current |
34.7us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentLiabilities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember |
31.0us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentLiabilities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember |
Disposal group, Including Discontinued Operation, Pension and Other Postretirement Obligations |
56.7clf_DisposalgroupIncludingDiscontinuedOperationPensionandOtherPostretirementObligations / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember |
55.8clf_DisposalgroupIncludingDiscontinuedOperationPensionandOtherPostretirementObligations / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember |
Disposal Group Including Discontinued Operations Environmental Loss Contingency And Mine Reclamation And Closing Liability CurrentAnd Noncurrent |
34.4clf_DisposalGroupIncludingDiscontinuedOperationsEnvironmentalLossContingencyAndMineReclamationAndClosingLiabilityCurrentAndNoncurrent / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember |
33.9clf_DisposalGroupIncludingDiscontinuedOperationsEnvironmentalLossContingencyAndMineReclamationAndClosingLiabilityCurrentAndNoncurrent / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember |
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent |
31.9us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember |
36.2us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember |
Disposal Group, Including Discontinued Operation, Liabilities |
$ 197.7us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember |
$ 207.2us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember |
X | ||||||||||
- Definition
Disposal group, Including Discontinued Operation, Pension and Other Postretirement Obligations No definition available.
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X | ||||||||||
- Definition
Disposal Group Including Discontinued Operations Environmental Loss Contingency And Mine Reclamation And Closing Liability Current And Noncurrent No definition available.
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X | ||||||||||
- Definition
Disposal group, including Discontinued Operations, Prepaid Supplies No definition available.
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X | ||||||||||
- Details
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X | ||||||||||
- Definition
Amount classified as assets attributable to disposal group held for sale or disposed of. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition
Amount classified as accounts, notes and loans receivable attributable to disposal group held for sale or disposed of. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition
Amount classified as accounts payable attributable to disposal group held for sale or disposed of. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition
Amount classified as accrued liabilities attributable to disposal group held for sale or disposed of. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition
Amount classified as inventory attributable to disposal group held for sale or disposed of. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition
Amount classified as other assets attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition
Amount classified as other liabilities attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition
Amount classified as other assets attributable to disposal group held for sale or disposed of, expected to be disposed of after one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition
Amount classified as other liabilities attributable to disposal group held for sale or disposed of, expected to be disposed of beyond one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition
Amount classified as property, plant and equipment attributable to disposal group held for sale or disposed of. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition
Amount classified as liabilities attributable to disposal group held for sale or disposed of. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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