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DISCONTINUED OPERATIONS Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis - North American Coal (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014
Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Nonrecurring | $ 397.2 us-gaap_AssetsFairValueDisclosureNonrecurring | $ 79.4 us-gaap_AssetsFairValueDisclosureNonrecurring
Impairment Charges | 269.5 clf_ImpairmentCharges | 644.7 clf_ImpairmentCharges
North American Coal [Member] |  |
Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis [Line Items] |  |
Property, Plant, and Equipment, Fair Value Disclosure | 20.4 us-gaap_PropertyPlantAndEquipmentFairValueDisclosure / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember |
Tangible Asset Impairment Charges | (73.4)us-gaap_TangibleAssetImpairmentCharges / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember |
Assets, Fair Value Disclosure, Nonrecurring | 20.4 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember |
Impairment Charges | (73.4)clf_ImpairmentCharges / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember |
Fair Value, Inputs, Level 1 [Member] |  |
Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Nonrecurring | 0 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 1 [Member] | North American Coal [Member] |  |
Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis [Line Items] |  |
Property, Plant, and Equipment, Fair Value Disclosure | 0 us-gaap_PropertyPlantAndEquipmentFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember |
Assets, Fair Value Disclosure, Nonrecurring | 0 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember |
Fair Value, Inputs, Level 2 [Member] |  |
Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Nonrecurring | 397.2 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 2 [Member] | North American Coal [Member] |  |
Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis [Line Items] |  |
Property, Plant, and Equipment, Fair Value Disclosure | 0 us-gaap_PropertyPlantAndEquipmentFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember |
Assets, Fair Value Disclosure, Nonrecurring | 0 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember |
Fair Value, Inputs, Level 3 [Member] |  |
Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Nonrecurring | 0 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 79.4 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Fair Value, Inputs, Level 3 [Member] | North American Coal [Member] |  |
Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis [Line Items] |  |
Property, Plant, and Equipment, Fair Value Disclosure | 20.4 us-gaap_PropertyPlantAndEquipmentFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember |
Assets, Fair Value Disclosure, Nonrecurring | $ 20.4 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_NorthAmericanCoalMember |

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