Annual report pursuant to Section 13 and 15(d)

INCOME TAXES INCOME TAXES (Schedule of Components of Income Taxes) (Details)

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 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 $ 101.3us-gaap_CurrentFederalTaxExpenseBenefit $ 71.1us-gaap_CurrentFederalTaxExpenseBenefit
Current State and Local Tax Expense (Benefit)   (0.6)us-gaap_CurrentStateAndLocalTaxExpenseBenefit 4.0us-gaap_CurrentStateAndLocalTaxExpenseBenefit 7.6us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Current Foreign Tax Expense (Benefit)   17.2us-gaap_CurrentForeignTaxExpenseBenefit 87.9us-gaap_CurrentForeignTaxExpenseBenefit 50.2us-gaap_CurrentForeignTaxExpenseBenefit
Current Income Tax Expense (Benefit)   (143.3)us-gaap_CurrentIncomeTaxExpenseBenefit 193.2us-gaap_CurrentIncomeTaxExpenseBenefit 128.9us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred Federal Income Tax Expense (Benefit)   (258.9)us-gaap_DeferredFederalIncomeTaxExpenseBenefit 23.3us-gaap_DeferredFederalIncomeTaxExpenseBenefit 221.2us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Deferred State and Local Income Tax Expense (Benefit)   (43.0)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 3.0us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 1.4us-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 127.0us-gaap_DeferredIncomeTaxExpenseBenefit
Income Tax Expense (Benefit) (289.7)us-gaap_IncomeTaxExpenseBenefit (1,302.0)us-gaap_IncomeTaxExpenseBenefit 55.1us-gaap_IncomeTaxExpenseBenefit 255.9us-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 		$ 127.0us-gaap_DeferredIncomeTaxExpenseBenefit
/ clf_IncomeTaxDescriptionAxis
= clf_DeferredProvisionBenefitMember