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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
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| 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 |
$ 112.1clf_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 |
342.7clf_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 |
0clf_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 |
0clf_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 |
0clf_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 |
0clf_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 |
112.1clf_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 |
$ 342.7clf_ContingentLiabilitiesandJointandSeveralLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = clf_BloomLakeGroupMember |
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Contingent Liabilities and Joint and Several Liabilities, Fair Value Disclosure No definition available.
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Loans to and Accounts Receivables from Bloom Lake Group, Fair Value Disclosure No definition available.
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Losses on Contingent Liabilities and Joint and Several Liabilities No definition available.
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Losses on Loans to and Accounts Receivables from the Bloom Lake Group No definition available.
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