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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) Accumulated Other Comprehensive Income (Loss) and Related Tax Effects (Details) (USD $) In Millions, unless otherwise specified | 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, 2012 | Dec. 31, 2011
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Accumulated Other Comprehensive Income (Loss), Before Taxes | $ (388.1)clf_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes |  |  |  | $ (213.3)clf_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes |  |  |  | $ (244.7)clf_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes |
Accumulated Other Comprehensive Income (Loss), Tax | 142.3 clf_AccumulatedOtherComprehensiveIncomeLossTax |  |  |  | 100.4 clf_AccumulatedOtherComprehensiveIncomeLossTax |  |  |  | 189.1 clf_AccumulatedOtherComprehensiveIncomeLossTax |
Accumulated other comprehensive loss | (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 | (55.6)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (92.6)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Postretirement Benefit Liability [Member] |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Before Taxes | (425.3)clf_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes / clf_AccumulatedOtherComprehensiveIncomeComponentsAxis = clf_PostretirementBenefitLiabilityMember |  |  |  | (299.3)clf_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes / clf_AccumulatedOtherComprehensiveIncomeComponentsAxis = clf_PostretirementBenefitLiabilityMember |  |  |  | (576.7)clf_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes / clf_AccumulatedOtherComprehensiveIncomeComponentsAxis = clf_PostretirementBenefitLiabilityMember |
Accumulated Other Comprehensive Income (Loss), Tax | 134.2 clf_AccumulatedOtherComprehensiveIncomeLossTax / clf_AccumulatedOtherComprehensiveIncomeComponentsAxis = clf_PostretirementBenefitLiabilityMember |  |  |  | 94.4 clf_AccumulatedOtherComprehensiveIncomeLossTax / clf_AccumulatedOtherComprehensiveIncomeComponentsAxis = clf_PostretirementBenefitLiabilityMember |  |  |  | 194.0 clf_AccumulatedOtherComprehensiveIncomeLossTax / clf_AccumulatedOtherComprehensiveIncomeComponentsAxis = clf_PostretirementBenefitLiabilityMember |
Accumulated other comprehensive loss | (291.1)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / clf_AccumulatedOtherComprehensiveIncomeComponentsAxis = clf_PostretirementBenefitLiabilityMember |  |  |  | (204.9)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / clf_AccumulatedOtherComprehensiveIncomeComponentsAxis = clf_PostretirementBenefitLiabilityMember |  |  |  | (382.7)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / clf_AccumulatedOtherComprehensiveIncomeComponentsAxis = clf_PostretirementBenefitLiabilityMember |
Foreign Currency Translation Adjustment [Member] |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Before Taxes | 64.4 clf_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes / clf_AccumulatedOtherComprehensiveIncomeComponentsAxis = clf_ForeignCurrencyTranslationAdjustmentMember |  |  |  | 106.7 clf_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes / clf_AccumulatedOtherComprehensiveIncomeComponentsAxis = clf_ForeignCurrencyTranslationAdjustmentMember |  |  |  | 316.3 clf_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes / clf_AccumulatedOtherComprehensiveIncomeComponentsAxis = clf_ForeignCurrencyTranslationAdjustmentMember |
Accumulated Other Comprehensive Income (Loss), Tax | 0 clf_AccumulatedOtherComprehensiveIncomeLossTax / clf_AccumulatedOtherComprehensiveIncomeComponentsAxis = clf_ForeignCurrencyTranslationAdjustmentMember |  |  |  | 0 clf_AccumulatedOtherComprehensiveIncomeLossTax / clf_AccumulatedOtherComprehensiveIncomeComponentsAxis = clf_ForeignCurrencyTranslationAdjustmentMember |  |  |  | 0 clf_AccumulatedOtherComprehensiveIncomeLossTax / clf_AccumulatedOtherComprehensiveIncomeComponentsAxis = clf_ForeignCurrencyTranslationAdjustmentMember |
Accumulated other comprehensive loss | 64.4 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / clf_AccumulatedOtherComprehensiveIncomeComponentsAxis = clf_ForeignCurrencyTranslationAdjustmentMember |  |  |  | 106.7 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / clf_AccumulatedOtherComprehensiveIncomeComponentsAxis = clf_ForeignCurrencyTranslationAdjustmentMember |  |  |  | 316.3 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / clf_AccumulatedOtherComprehensiveIncomeComponentsAxis = clf_ForeignCurrencyTranslationAdjustmentMember |
Unrealized Gain Loss On Derivatives [Member] |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Before Taxes | (25.9)clf_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes / clf_AccumulatedOtherComprehensiveIncomeComponentsAxis = clf_UnrealizedGainLossOnDerivativesMember |  |  |  | (30.0)clf_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes / clf_AccumulatedOtherComprehensiveIncomeComponentsAxis = clf_UnrealizedGainLossOnDerivativesMember |  |  |  | 12.4 clf_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes / clf_AccumulatedOtherComprehensiveIncomeComponentsAxis = clf_UnrealizedGainLossOnDerivativesMember |
Accumulated Other Comprehensive Income (Loss), Tax | 7.8 clf_AccumulatedOtherComprehensiveIncomeLossTax / clf_AccumulatedOtherComprehensiveIncomeComponentsAxis = clf_UnrealizedGainLossOnDerivativesMember |  |  |  | 9.1 clf_AccumulatedOtherComprehensiveIncomeLossTax / clf_AccumulatedOtherComprehensiveIncomeComponentsAxis = clf_UnrealizedGainLossOnDerivativesMember |  |  |  | (3.7)clf_AccumulatedOtherComprehensiveIncomeLossTax / clf_AccumulatedOtherComprehensiveIncomeComponentsAxis = clf_UnrealizedGainLossOnDerivativesMember |
Accumulated other comprehensive loss | (18.1)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / clf_AccumulatedOtherComprehensiveIncomeComponentsAxis = clf_UnrealizedGainLossOnDerivativesMember |  |  |  | (20.9)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / clf_AccumulatedOtherComprehensiveIncomeComponentsAxis = clf_UnrealizedGainLossOnDerivativesMember |  |  |  | 8.7 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / clf_AccumulatedOtherComprehensiveIncomeComponentsAxis = clf_UnrealizedGainLossOnDerivativesMember |
Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Before Taxes | (1.3)clf_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes / clf_AccumulatedOtherComprehensiveIncomeComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  |  |  | 9.3 clf_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes / clf_AccumulatedOtherComprehensiveIncomeComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  |  |  | 3.3 clf_AccumulatedOtherComprehensiveIncomeLossBeforeTaxes / clf_AccumulatedOtherComprehensiveIncomeComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Accumulated Other Comprehensive Income (Loss), Tax | 0.3 clf_AccumulatedOtherComprehensiveIncomeLossTax / clf_AccumulatedOtherComprehensiveIncomeComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  |  |  | (3.1)clf_AccumulatedOtherComprehensiveIncomeLossTax / clf_AccumulatedOtherComprehensiveIncomeComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  |  |  | (1.2)clf_AccumulatedOtherComprehensiveIncomeLossTax / clf_AccumulatedOtherComprehensiveIncomeComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Accumulated other comprehensive loss | $ (1.0)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / clf_AccumulatedOtherComprehensiveIncomeComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  |  |  | $ 6.2 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / clf_AccumulatedOtherComprehensiveIncomeComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  |  |  | $ 2.1 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / clf_AccumulatedOtherComprehensiveIncomeComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |

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