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PENSION AND OTHER POSTRETIREMENT BENEFITS (Estimated Future Benefit Payments) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Defined Benefit Plan Expected Net Periodic Benefit Cost | $ 29.6 clf_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 | 23.6 clf_DefinedBenefitPlanExpectedNetPeriodicBenefitCost / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember
2015 | 89.3 us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember
2016 | 77.7 us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember
2017 | 78.1 us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember
2018 | 79.3 us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember
2019 | 78.6 us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember
2020-2024 | 402.4 us-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 | 6.0 clf_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 | 23.1 us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths / clf_EstimatedFutureBenefitPaymentsAxis = clf_GrossCompanyBenefitsMember
2016 | 23.0 us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo / clf_EstimatedFutureBenefitPaymentsAxis = clf_GrossCompanyBenefitsMember
2017 | 23.2 us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree / clf_EstimatedFutureBenefitPaymentsAxis = clf_GrossCompanyBenefitsMember
2018 | 23.3 us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour / clf_EstimatedFutureBenefitPaymentsAxis = clf_GrossCompanyBenefitsMember
2019 | 22.9 us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive / clf_EstimatedFutureBenefitPaymentsAxis = clf_GrossCompanyBenefitsMember
2020-2024 | 110.7 us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter / clf_EstimatedFutureBenefitPaymentsAxis = clf_GrossCompanyBenefitsMember
Less Medicare Subsidy [Member] |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
2015 | 0.9 us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths / clf_EstimatedFutureBenefitPaymentsAxis = clf_MedicarePartDSubsidyMember
2016 | 1.0 us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo / clf_EstimatedFutureBenefitPaymentsAxis = clf_MedicarePartDSubsidyMember
2017 | 1.1 us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree / clf_EstimatedFutureBenefitPaymentsAxis = clf_MedicarePartDSubsidyMember
2018 | 1.3 us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour / clf_EstimatedFutureBenefitPaymentsAxis = clf_MedicarePartDSubsidyMember
2019 | 1.4 us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive / clf_EstimatedFutureBenefitPaymentsAxis = clf_MedicarePartDSubsidyMember
2020-2024 | 8.6 us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter / clf_EstimatedFutureBenefitPaymentsAxis = clf_MedicarePartDSubsidyMember
Net Company Payments [Member] |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
2015 | 22.2 us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths / clf_EstimatedFutureBenefitPaymentsAxis = clf_NetCompanyPaymentsMember
2016 | 22.0 us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo / clf_EstimatedFutureBenefitPaymentsAxis = clf_NetCompanyPaymentsMember
2017 | 22.1 us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree / clf_EstimatedFutureBenefitPaymentsAxis = clf_NetCompanyPaymentsMember
2018 | 22.0 us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour / clf_EstimatedFutureBenefitPaymentsAxis = clf_NetCompanyPaymentsMember
2019 | 21.5 us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive / clf_EstimatedFutureBenefitPaymentsAxis = clf_NetCompanyPaymentsMember
2020-2024 | $ 102.1 us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter / clf_EstimatedFutureBenefitPaymentsAxis = clf_NetCompanyPaymentsMember

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- Definition Amount of benefits from a defined benefit plan expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Amount of benefits from a defined benefit plan expected to be paid in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Amount of benefits from a defined benefit plan expected to be paid in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Amount of benefits from a defined benefit plan expected to be paid in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Amount of benefits from a defined benefit plan expected to be paid in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Amount of benefits from a defined benefit plan expected to be paid in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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