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DISCONTINUED OPERATIONS Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis - Canadian Entities (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015
Canadian Entities [Member] |
Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis [Line Items] |
Loans to and Accounts Receivables from Bloom Lake Group, Fair Value Disclosure | $ 112.1 clf_LoanstoandAccountsReceivablesfromBloomLakeGroupFairValueDisclosure / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_CanadianEntitiesMember
Losses on Loans to and Accounts Receivables from the Bloom Lake Group | (476.0)clf_LossesonLoanstoandAccountsReceivablesfromtheBloomLakeGroup / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_CanadianEntitiesMember
Bloom Lake Group [Member] |
Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis [Line Items] |
Contingent Liabilities and Joint and Several Liabilities, Fair Value Disclosure | 342.7 clf_ContingentLiabilitiesandJointandSeveralLiabilitiesFairValueDisclosure / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_BloomLakeGroupMember
Losses on Contingent Liabilities and Joint and Several Liabilities | (342.7)clf_LossesonContingentLiabilitiesandJointandSeveralLiabilities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_BloomLakeGroupMember
Fair Value, Inputs, Level 1 [Member] | Canadian Entities [Member] |
Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis [Line Items] |
Loans to and Accounts Receivables from Bloom Lake Group, Fair Value Disclosure | 0 clf_LoanstoandAccountsReceivablesfromBloomLakeGroupFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_CanadianEntitiesMember
Fair Value, Inputs, Level 1 [Member] | Bloom Lake Group [Member] |
Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis [Line Items] |
Contingent Liabilities and Joint and Several Liabilities, Fair Value Disclosure | 0 clf_ContingentLiabilitiesandJointandSeveralLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_BloomLakeGroupMember
Fair Value, Inputs, Level 2 [Member] | Canadian Entities [Member] |
Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis [Line Items] |
Loans to and Accounts Receivables from Bloom Lake Group, Fair Value Disclosure | 0 clf_LoanstoandAccountsReceivablesfromBloomLakeGroupFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_CanadianEntitiesMember
Fair Value, Inputs, Level 2 [Member] | Bloom Lake Group [Member] |
Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis [Line Items] |
Contingent Liabilities and Joint and Several Liabilities, Fair Value Disclosure | 0 clf_ContingentLiabilitiesandJointandSeveralLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_BloomLakeGroupMember
Fair Value, Inputs, Level 3 [Member] | Canadian Entities [Member] |
Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis [Line Items] |
Loans to and Accounts Receivables from Bloom Lake Group, Fair Value Disclosure | 112.1 clf_LoanstoandAccountsReceivablesfromBloomLakeGroupFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_CanadianEntitiesMember
Fair Value, Inputs, Level 3 [Member] | Bloom Lake Group [Member] |
Discontinued Operations, Items Measured at Fair Value on a Non-Recurring Basis [Line Items] |
Contingent Liabilities and Joint and Several Liabilities, Fair Value Disclosure | $ 342.7 clf_ContingentLiabilitiesandJointandSeveralLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_BloomLakeGroupMember

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