Annual report pursuant to Section 13 and 15(d)

PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Annual Contributions To The Pension Plans) (Details)

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12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Company contributions $ 7.3us-gaap_DefinedBenefitPlanContributionsByEmployer $ 25.5us-gaap_DefinedBenefitPlanContributionsByEmployer
Expected company contributions, next fiscal year 6.8us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear  
Funded percentage 70.00%us-gaap_DefinedBenefitPlanFundedPercentage  
Value of VEBA Trust Assets as a Percentage of the Funding Obligation 0.9clf_ValueOfVebaTrustAssetsAsPercentageOfFundingObligation  
Pension Benefits [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Company contributions 60.5us-gaap_DefinedBenefitPlanContributionsByEmployer
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
53.7us-gaap_DefinedBenefitPlanContributionsByEmployer
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Expected company contributions, next fiscal year 36.8us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
 
Veba Trust [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Company contributions 0us-gaap_DefinedBenefitPlanContributionsByEmployer
/ clf_OtherBenefitsAxis
= clf_VebaTrustMember
14.6us-gaap_DefinedBenefitPlanContributionsByEmployer
/ clf_OtherBenefitsAxis
= clf_VebaTrustMember
Expected company contributions, next fiscal year 0us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear
/ clf_OtherBenefitsAxis
= clf_VebaTrustMember
 
Direct Payments [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Company contributions 7.3us-gaap_DefinedBenefitPlanContributionsByEmployer
/ clf_OtherBenefitsAxis
= clf_DirectPaymentsMember
10.9us-gaap_DefinedBenefitPlanContributionsByEmployer
/ clf_OtherBenefitsAxis
= clf_DirectPaymentsMember
Expected company contributions, next fiscal year $ 6.8us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear
/ clf_OtherBenefitsAxis
= clf_DirectPaymentsMember