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QUARTERLY RESULTS OF OPERATIONS (UNAUDITED) QUARTERLY RESULTS OF OPERATIONS (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
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, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income (Loss) from Continuing Operations Attributable to Parent | $ (1,285,100,000)us-gaap_IncomeLossFromContinuingOperations | $ (5,879,600,000)us-gaap_IncomeLossFromContinuingOperations | $ 10,900,000 us-gaap_IncomeLossFromContinuingOperations | $ (70,300,000)us-gaap_IncomeLossFromContinuingOperations | $ 43,300,000 us-gaap_IncomeLossFromContinuingOperations | $ 115,200,000 us-gaap_IncomeLossFromContinuingOperations | $ 146,000,000 us-gaap_IncomeLossFromContinuingOperations | $ 107,000,000 us-gaap_IncomeLossFromContinuingOperations | $ (7,224,200,000)us-gaap_IncomeLossFromContinuingOperations | $ 411,500,000 us-gaap_IncomeLossFromContinuingOperations | $ (935,300,000)us-gaap_IncomeLossFromContinuingOperations |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 25.2 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |  |  |  |  |  |  | 12.9 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 25.2 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |  |  |
Goodwill, Impairment Loss |  |  |  |  |  |  |  |  | 73,500,000 us-gaap_GoodwillImpairmentLoss | 80,900,000 us-gaap_GoodwillImpairmentLoss |  |
Loss on sale of Cliffs Logan County Coal |  |  |  |  |  |  |  |  | 419,600,000 clf_LossonsaleofCliffsLoganCountyCoal | 0 clf_LossonsaleofCliffsLoganCountyCoal | 0 clf_LossonsaleofCliffsLoganCountyCoal |
Sale Price of CLCC Assets |  |  |  |  |  |  |  |  | 174,000,000 clf_SalePriceofCLCCAssets |  |  |
Proceeds from sale of Cliffs Logan County Coal |  |  |  |  |  |  |  |  | 155,000,000 clf_ProceedsfromsaleofCliffsLoganCountyCoal | 0 clf_ProceedsfromsaleofCliffsLoganCountyCoal | 0 clf_ProceedsfromsaleofCliffsLoganCountyCoal |
Income Tax Expense (Benefit) | (289,700,000)us-gaap_IncomeTaxExpenseBenefit |  |  |  |  |  |  |  | (1,302,000,000)us-gaap_IncomeTaxExpenseBenefit | 55,100,000 us-gaap_IncomeTaxExpenseBenefit | 255,900,000 us-gaap_IncomeTaxExpenseBenefit |
Asset Impairment Charges |  |  |  |  |  |  |  |  | 9,029,900,000.0 us-gaap_AssetImpairmentCharges | 250,800,000.0 us-gaap_AssetImpairmentCharges | 1,049,900,000.0 us-gaap_AssetImpairmentCharges |
Cliffs Chromite Ontario and Cliffs Chromite Far North [Member] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Impairment Loss |  |  |  |  |  |  |  |  |  | 80,900,000 us-gaap_GoodwillImpairmentLoss / clf_ReportingUnitAxis = clf_CliffsChromiteOntarioandCliffsChromiteFarNorthMember |  |
Wabush [Member] |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairment Charges |  |  |  |  |  |  |  |  | 154,600,000.0 us-gaap_AssetImpairmentCharges / clf_ReportingUnitAxis = clf_WabushMember |  |  |
Bloom Lake [Member] |  |  |  |  |  |  |  |  |  |  |  |
Immaterial Error Adjustment Related to Bloom Lake Purchase Price Acquisition |  |  |  |  |  |  |  |  |  | 45,100,000 clf_ImmaterialErrorAdjustmentRelatedtoBloomLakePurchasePriceAcquisition / clf_NameofOperationAxis = clf_BloomLakeMember |  |
Change in Basic EPS for Immaterial Error Adjustment Related to Bloom Lake Purchase Price Acquisition |  |  |  |  | $ 0.29 clf_ChangeinBasicEPSforImmaterialErrorAdjustmentRelatedtoBloomLakePurchasePriceAcquisition / clf_NameofOperationAxis = clf_BloomLakeMember |  |  |  |  | $ 0.30 clf_ChangeinBasicEPSforImmaterialErrorAdjustmentRelatedtoBloomLakePurchasePriceAcquisition / clf_NameofOperationAxis = clf_BloomLakeMember | $ 0 clf_ChangeinBasicEPSforImmaterialErrorAdjustmentRelatedtoBloomLakePurchasePriceAcquisition / clf_NameofOperationAxis = clf_BloomLakeMember | $ 0.07 clf_ChangeinBasicEPSforImmaterialErrorAdjustmentRelatedtoBloomLakePurchasePriceAcquisition / clf_NameofOperationAxis = clf_BloomLakeMember
Change in Diluted EPS for Immaterial Error Adjustment Related to Bloom Lake Purchase Price Acquisition |  |  |  |  |  |  |  |  |  | $ 0.26 clf_ChangeinDilutedEPSforImmaterialErrorAdjustmentRelatedtoBloomLakePurchasePriceAcquisition / clf_NameofOperationAxis = clf_BloomLakeMember | $ 0.25 clf_ChangeinDilutedEPSforImmaterialErrorAdjustmentRelatedtoBloomLakePurchasePriceAcquisition / clf_NameofOperationAxis = clf_BloomLakeMember | $ 0.07 clf_ChangeinDilutedEPSforImmaterialErrorAdjustmentRelatedtoBloomLakePurchasePriceAcquisition / clf_NameofOperationAxis = clf_BloomLakeMember
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from Continuing Operations Attributable to Parent |  |  |  |  |  |  |  |  | 300,000 us-gaap_IncomeLossFromContinuingOperations / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from Continuing Operations Attributable to Parent |  |  |  |  |  |  |  |  | 800,000 us-gaap_IncomeLossFromContinuingOperations / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Bloom Lake [Member] |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairment Charges |  |  |  |  |  |  |  |  | $ 1,300,000,000.0 us-gaap_AssetImpairmentCharges / clf_AssetgroupAxis = clf_BloomLakeMember |  |  |

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