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INCOME TAXES INCOME TAXES (Schedule of Deferred Tax Assets and Liabilities) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Income Tax Contingency [Line Items] |  |
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions | $ 108.3 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions | $ 88.4 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions
Deferred Tax Assets, MMRT Starting Base Allowance | 0 clf_DeferredTaxAssetsMmrtStartingBaseAllowance | 300.3 clf_DeferredTaxAssetsMmrtStartingBaseAllowance
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits | 63.0 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits | 58.0 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax | 267.7 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax | 299.2 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
Deferred Tax Assets Development Costs | 6.0 clf_DeferredTaxAssetsDevelopmentCosts | 0 clf_DeferredTaxAssetsDevelopmentCosts
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Asset Retirement Obligations | 48.9 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations | 61.7 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations
Deferred Tax Assets, Operating Loss Carryforwards | 1,083.5 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 524.4 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Deferred Tax Assets, Inventory | 32.3 us-gaap_DeferredTaxAssetsInventory | 16.4 us-gaap_DeferredTaxAssetsInventory
Deferred Tax Assets, Property, Plant and Equipment | 901.6 us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment | 56.0 us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Deferred Tax Assets, State Taxes | 41.9 us-gaap_DeferredTaxAssetsStateTaxes | 0 us-gaap_DeferredTaxAssetsStateTaxes
Deferred Tax Assets Leasing Arrangements | 14.1 clf_DeferredTaxAssetsLeasingArrangements | 31.9 clf_DeferredTaxAssetsLeasingArrangements
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other | 153.6 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther | 138.3 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther
Deferred Tax Assets, Gross | 2,720.9 us-gaap_DeferredTaxAssetsGross | 1,574.6 us-gaap_DeferredTaxAssetsGross
Deferred Tax Assets, Valuation Allowance | (2,224.5)us-gaap_DeferredTaxAssetsValuationAllowance | (864.1)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred Tax Assets, Net of Valuation Allowance | 496.4 us-gaap_DeferredTaxAssetsNet | 710.5 us-gaap_DeferredTaxAssetsNet
Deferred Tax Liabilities, Property, Plant and Equipment | (20.0)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | (1,400.8)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Deferred Tax Liabilities Investment In Ventures | (198.0)clf_DeferredTaxLiabilitiesInvestmentInVentures | (196.4)clf_DeferredTaxLiabilitiesInvestmentInVentures
Deferred Tax Liabilities, Intangible Assets | (7.3)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets | (33.5)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Deferred Tax Liabilities Income Tax Uncertainties | (49.5)clf_DeferredTaxLiabilitiesIncomeTaxUncertainties | (48.5)clf_DeferredTaxLiabilitiesIncomeTaxUncertainties
Deferred Tax Liabilities, Tax Deferred Income | (16.6)us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome | (12.8)us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome
Deferred Tax Liabilities Other Assets | (80.2)clf_DeferredTaxLiabilitiesOtherAssets | (93.0)clf_DeferredTaxLiabilitiesOtherAssets
Deferred Tax Liabilities, Net | (371.6)us-gaap_DeferredTaxLiabilities | (1,785.0)us-gaap_DeferredTaxLiabilities
Deferred Tax Assets, Net | $ 124.8 us-gaap_DeferredTaxAssetsLiabilitiesNet | $ (1,074.5)us-gaap_DeferredTaxAssetsLiabilitiesNet

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- Definition The tax effect as of the balance sheet date of the amount of the estimated future tax deductions attributable lease liabilities. + References No definition available. + Details
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- Definition Deferred Tax Assets, MMRT Starting Base Allowance + References No definition available. + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Asset -URI http://asc.fasb.org/extlink&oid=6510090 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from pension benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from asset retirement obligations. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from other reserves and accruals not separately disclosed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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