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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax | $ (291.1)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax | $ (204.9)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax | $ (382.7)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax | $ (291.1)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax | $ (188.3)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax | $ (199.4)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax | $ (202.0)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax | $ (204.9)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax | $ (365.1)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax | $ (370.8)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax | $ (377.4)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax | $ (408.9)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax
Accumulated other comprehensive loss | (245.8)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (112.9)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (55.6)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (245.8)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (101.4)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (20.2)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (55.1)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (112.9)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (178.4)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (239.6)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (51.4)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (92.6)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax | (1.0)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | 6.2 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | 2.1 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | (1.0)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | 0.6 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | 6.4 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | 10.1 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | 6.2 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | 10.7 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | 6.3 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | 4.7 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | 2.6 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax | 64.4 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax | 106.7 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax | 316.3 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax | 64.4 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax | 101.0 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax | 166.9 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax | 147.2 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax | 106.7 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax | 190.4 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax | 167.6 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax | 319.6 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax | 312.5 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax | (18.1)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax | (20.9)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax | 8.7 us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax | (18.1)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax | (14.7)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax | 5.9 us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax | (10.4)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax | (20.9)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax | (14.4)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax | (42.7)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax | 1.7 us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax | 1.2 us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax | 91.0 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax | (208.3)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax | (33.8)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax |  |  |  |  |  |  |  |  |
Unrealized net gain (loss) on marketable securities, net of tax | (7.2)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | 3.1 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | (0.5)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax |  |  |  |  |  |  |  |  |
Unrealized net gain (loss) on foreign currency translation | (42.3)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax | (208.6)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax | 3.8 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | (137.7)us-gaap_OtherComprehensiveIncomeLossNetOfTax | (26.8)us-gaap_OtherComprehensiveIncomeLossNetOfTax | 44.6 us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, before Tax |  |  |  | (152.3)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (81.1)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 25.6 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 41.6 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 49.3 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 37.8 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (197.7)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (0.3)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  |  |  | 7.9 clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (0.1)clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 9.3 clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 16.2 clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 16.2 clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 23.4 clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 9.5 clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 4.5 clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, before Tax |  |  |  | (98.7)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 3.5 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | (1.4)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | (0.4)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 154.5 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | (0.6)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | (1.5)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | (1.1)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, before Tax |  |  |  | (1.4)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 1.3 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | (2.4)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 3.8 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | (4.9)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 3.5 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | (2.0)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 2.5 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Accumulated Translation Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, before Tax |  |  |  | (36.6)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedTranslationAdjustmentMember | (65.9)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedTranslationAdjustmentMember | 19.7 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedTranslationAdjustmentMember | 40.5 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedTranslationAdjustmentMember | (83.7)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedTranslationAdjustmentMember | 22.8 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedTranslationAdjustmentMember | (152.0)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedTranslationAdjustmentMember | 3.3 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedTranslationAdjustmentMember |
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] |  |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, before Tax |  |  |  | (15.6)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | (20.0)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | 9.7 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | (2.3)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | (16.6)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | 12.1 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | (42.2)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | (5.0)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  |  |  | (4.1)clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 7.6 clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 4.0 clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 3.3 clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 5.7 clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 6.3 clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 8.1 clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 6.4 clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  |  |  | (0.2)clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | (7.1)clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | (1.3)clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 0.1 clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 0.4 clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 0.9 clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 3.6 clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 0.1 clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Accumulated Translation Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  |  |  | 0 clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedTranslationAdjustmentMember | 0 clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedTranslationAdjustmentMember | 0 clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedTranslationAdjustmentMember | 0 clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedTranslationAdjustmentMember | 0 clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedTranslationAdjustmentMember | 0 clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedTranslationAdjustmentMember | 0 clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedTranslationAdjustmentMember | 0 clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedTranslationAdjustmentMember |
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] |  |  |  |  |  |  |  |  |  |  |  |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  |  |  | 12.2 clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | (0.6)clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | 6.6 clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | 12.8 clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | 10.1 clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | 16.2 clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | (2.2)clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | (2.0)clf_AmountsReclassifiedFromAccumulatedOtherComprehensiveIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
Cliffs Shareholders Equity [Member] |  |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax |  |  | 26.2 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  |  |
Unrealized net gain (loss) on marketable securities, net of tax |  |  | (0.5)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax |  |  | 3.8 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax |  |  | 7.5 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax |  |  | $ 37.0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |  |  |  |

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