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INCOME TAXES INCOME TAXES (Schedule of Unrecognized Tax Benefits Rollforward) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2010
Income Tax Contingency [Line Items] |  |  |  |
Unrecognized Tax Benefits | $ 74.7 us-gaap_UnrecognizedTaxBenefits | $ 74.4 us-gaap_UnrecognizedTaxBenefits | $ 55.5 us-gaap_UnrecognizedTaxBenefits | $ 102.1 us-gaap_UnrecognizedTaxBenefits
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions | 3.4 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions | 13.6 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions | 2.7 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions |
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions | 2.5 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions | 5.3 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions | 11.1 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions |
Unrecognized Tax Benefits Increases Decreases Resulting From Currency Translation | (0.2)clf_UnrecognizedTaxBenefitsIncreasesDecreasesResultingFromCurrencyTranslation | 0 clf_UnrecognizedTaxBenefitsIncreasesDecreasesResultingFromCurrencyTranslation | 0 clf_UnrecognizedTaxBenefitsIncreasesDecreasesResultingFromCurrencyTranslation |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | (0.5)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities | 0 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities | (60.4)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities |
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations | (3.7)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations | 0 us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations | 0 us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations |
Other Increases decreases to unrecognized tax benefits | $ (1.2)clf_OtherIncreasesDecreasesToUnrecognizedTaxBenefits | $ 0 clf_OtherIncreasesDecreasesToUnrecognizedTaxBenefits | $ 0 clf_OtherIncreasesDecreasesToUnrecognizedTaxBenefits |

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- Definition The gross amount of increases in unrecognized tax benefits resulting from currency translation. + References No definition available. + Details
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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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