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INCOME TAXES INCOME TAXES (Schedule of Components of Income Taxes) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax Contingency [Line Items] |  |  |  |
Current Federal Tax Expense (Benefit) |  | $ (159.9)us-gaap_CurrentFederalTaxExpenseBenefit | $ 101.3 us-gaap_CurrentFederalTaxExpenseBenefit | $ 71.1 us-gaap_CurrentFederalTaxExpenseBenefit
Current State and Local Tax Expense (Benefit) |  | (0.6)us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 4.0 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 7.6 us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Current Foreign Tax Expense (Benefit) |  | 17.2 us-gaap_CurrentForeignTaxExpenseBenefit | 87.9 us-gaap_CurrentForeignTaxExpenseBenefit | 50.2 us-gaap_CurrentForeignTaxExpenseBenefit
Current Income Tax Expense (Benefit) |  | (143.3)us-gaap_CurrentIncomeTaxExpenseBenefit | 193.2 us-gaap_CurrentIncomeTaxExpenseBenefit | 128.9 us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred Federal Income Tax Expense (Benefit) |  | (258.9)us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 23.3 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 221.2 us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Deferred State and Local Income Tax Expense (Benefit) |  | (43.0)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 3.0 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 1.4 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Deferred Foreign Income Tax Expense (Benefit) |  | (856.8)us-gaap_DeferredForeignIncomeTaxExpenseBenefit | (164.4)us-gaap_DeferredForeignIncomeTaxExpenseBenefit | (95.6)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Deferred Income Tax Expense (Benefit) |  | (1,153.9)us-gaap_DeferredIncomeTaxExpenseBenefit | (138.1)us-gaap_DeferredIncomeTaxExpenseBenefit | 127.0 us-gaap_DeferredIncomeTaxExpenseBenefit
Income Tax Expense (Benefit) | (289.7)us-gaap_IncomeTaxExpenseBenefit | (1,302.0)us-gaap_IncomeTaxExpenseBenefit | 55.1 us-gaap_IncomeTaxExpenseBenefit | 255.9 us-gaap_IncomeTaxExpenseBenefit
Deferred Provision (Benefit) [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Deferred Income Tax Expense (Benefit) |  | $ (1,158.7)us-gaap_DeferredIncomeTaxExpenseBenefit / clf_IncomeTaxDescriptionAxis = clf_DeferredProvisionBenefitMember | $ (138.1)us-gaap_DeferredIncomeTaxExpenseBenefit / clf_IncomeTaxDescriptionAxis = clf_DeferredProvisionBenefitMember | $ 127.0 us-gaap_DeferredIncomeTaxExpenseBenefit / clf_IncomeTaxDescriptionAxis = clf_DeferredProvisionBenefitMember

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