Annual report pursuant to Section 13 and 15(d)

PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Estimated Net Periodic Benefit Cost) (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]    
Estimated net periodic benefit cost $ 29.6clf_DefinedBenefitPlanExpectedNetPeriodicBenefitCost  
Pension Benefits [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plan, Contributions by Plan Participants 0us-gaap_DefinedBenefitPlanContributionsByPlanParticipants
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= us-gaap_PensionPlansDefinedBenefitMember 		0us-gaap_DefinedBenefitPlanContributionsByPlanParticipants
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= us-gaap_PensionPlansDefinedBenefitMember
Estimated net periodic benefit cost 23.6clf_DefinedBenefitPlanExpectedNetPeriodicBenefitCost
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= us-gaap_PensionPlansDefinedBenefitMember 		 
betfred sportsbookOther Benefits [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plan, Contributions by Plan Participants 4.8us-gaap_DefinedBenefitPlanContributionsByPlanParticipants
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= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember 		5.6us-gaap_DefinedBenefitPlanContributionsByPlanParticipants
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= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Estimated net periodic benefit cost $ 6.0clf_DefinedBenefitPlanExpectedNetPeriodicBenefitCost
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= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember