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INCOME TAXES INCOME TAXES (Schedule of Deferred Tax Assets and Liabilities by Location) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Income Tax Contingency [Line Items] |  |
Deferred Tax Liabilities, Net, Noncurrent | $ 51.3 us-gaap_DeferredTaxLiabilitiesNoncurrent | $ 1,146.5 us-gaap_DeferredTaxLiabilitiesNoncurrent
Deferred Tax Assets, Net | 124.8 us-gaap_DeferredTaxAssetsLiabilitiesNet | (1,074.5)us-gaap_DeferredTaxAssetsLiabilitiesNet
Foreign [Member] |  |
Income Tax Contingency [Line Items] |  |
Income tax receivable | 2.2 us-gaap_DeferredTaxAssetsNetCurrent / clf_RegionReportingInformationByRegionAxis = clf_ForeignMember | 29.4 us-gaap_DeferredTaxAssetsNetCurrent / clf_RegionReportingInformationByRegionAxis = clf_ForeignMember
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent | 12.0 us-gaap_DeferredTaxAssetsNetNoncurrent / clf_RegionReportingInformationByRegionAxis = clf_ForeignMember | 41.5 us-gaap_DeferredTaxAssetsNetNoncurrent / clf_RegionReportingInformationByRegionAxis = clf_ForeignMember
Deferred Tax Liabilities, Net, Noncurrent | 51.3 us-gaap_DeferredTaxLiabilitiesNoncurrent / clf_RegionReportingInformationByRegionAxis = clf_ForeignMember | 971.2 us-gaap_DeferredTaxLiabilitiesNoncurrent / clf_RegionReportingInformationByRegionAxis = clf_ForeignMember
Deferred Tax Liabilities, Net, Current | 4.0 us-gaap_DeferredTaxLiabilitiesCurrent / clf_RegionReportingInformationByRegionAxis = clf_ForeignMember | 6.1 us-gaap_DeferredTaxLiabilitiesCurrent / clf_RegionReportingInformationByRegionAxis = clf_ForeignMember
United States and Foreign [Member] |  |
Income Tax Contingency [Line Items] |  |
Deferred Tax Assets | 180.1 clf_DeferredTaxAssets / clf_RegionReportingInformationByRegionAxis = clf_UnitedStatesAndForeignMember | 78.1 clf_DeferredTaxAssets / clf_RegionReportingInformationByRegionAxis = clf_UnitedStatesAndForeignMember
Deferred Tax Liability | 55.3 clf_DeferredTaxLiability / clf_RegionReportingInformationByRegionAxis = clf_UnitedStatesAndForeignMember | 1,152.6 clf_DeferredTaxLiability / clf_RegionReportingInformationByRegionAxis = clf_UnitedStatesAndForeignMember
United States [Member] |  |
Income Tax Contingency [Line Items] |  |
Income tax receivable | 165.9 us-gaap_DeferredTaxAssetsNetCurrent / clf_RegionReportingInformationByRegionAxis = clf_UnitedStatesMember | 7.2 us-gaap_DeferredTaxAssetsNetCurrent / clf_RegionReportingInformationByRegionAxis = clf_UnitedStatesMember
Deferred Tax Liabilities, Net, Noncurrent | $ 0 us-gaap_DeferredTaxLiabilitiesNoncurrent / clf_RegionReportingInformationByRegionAxis = clf_UnitedStatesMember | $ 175.3 us-gaap_DeferredTaxLiabilitiesNoncurrent / clf_RegionReportingInformationByRegionAxis = clf_UnitedStatesMember

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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, evaluated and aggregated by country + References No definition available. + Details
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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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