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Annual report pursuant to Section 13 and 15(d)

PENSION AND OTHER POSTRETIREMENT BENEFITS (Estimated Future Benefit Payments) (Details)

v2.4.1.9
PENSION AND OTHER POSTRETIREMENT BENEFITS (Estimated Future Benefit Payments) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan Expected 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 Expected Net Periodic Benefit Cost 23.6clf_DefinedBenefitPlanExpectedNetPeriodicBenefitCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
2015 89.3us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
2016 77.7us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
2017 78.1us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
2018 79.3us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
2019 78.6us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
2020-2024 402.4us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan Expected Net Periodic Benefit Cost 6.0clf_DefinedBenefitPlanExpectedNetPeriodicBenefitCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Gross Company Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2015 23.1us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
/ clf_EstimatedFutureBenefitPaymentsAxis
= clf_GrossCompanyBenefitsMember
2016 23.0us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
/ clf_EstimatedFutureBenefitPaymentsAxis
= clf_GrossCompanyBenefitsMember
2017 23.2us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
/ clf_EstimatedFutureBenefitPaymentsAxis
= clf_GrossCompanyBenefitsMember
2018 23.3us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
/ clf_EstimatedFutureBenefitPaymentsAxis
= clf_GrossCompanyBenefitsMember
2019 22.9us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
/ clf_EstimatedFutureBenefitPaymentsAxis
= clf_GrossCompanyBenefitsMember
2020-2024 110.7us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
/ clf_EstimatedFutureBenefitPaymentsAxis
= clf_GrossCompanyBenefitsMember
Less Medicare Subsidy [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2015 0.9us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
/ clf_EstimatedFutureBenefitPaymentsAxis
= clf_MedicarePartDSubsidyMember
2016 1.0us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
/ clf_EstimatedFutureBenefitPaymentsAxis
= clf_MedicarePartDSubsidyMember
2017 1.1us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
/ clf_EstimatedFutureBenefitPaymentsAxis
= clf_MedicarePartDSubsidyMember
2018 1.3us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
/ clf_EstimatedFutureBenefitPaymentsAxis
= clf_MedicarePartDSubsidyMember
2019 1.4us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
/ clf_EstimatedFutureBenefitPaymentsAxis
= clf_MedicarePartDSubsidyMember
2020-2024 8.6us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
/ clf_EstimatedFutureBenefitPaymentsAxis
= clf_MedicarePartDSubsidyMember
Net Company Payments [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2015 22.2us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
/ clf_EstimatedFutureBenefitPaymentsAxis
= clf_NetCompanyPaymentsMember
2016 22.0us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
/ clf_EstimatedFutureBenefitPaymentsAxis
= clf_NetCompanyPaymentsMember
2017 22.1us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
/ clf_EstimatedFutureBenefitPaymentsAxis
= clf_NetCompanyPaymentsMember
2018 22.0us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
/ clf_EstimatedFutureBenefitPaymentsAxis
= clf_NetCompanyPaymentsMember
2019 21.5us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
/ clf_EstimatedFutureBenefitPaymentsAxis
= clf_NetCompanyPaymentsMember
2020-2024 $ 102.1us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
/ clf_EstimatedFutureBenefitPaymentsAxis
= clf_NetCompanyPaymentsMember