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STOCK COMPENSATION PLANS STOCK COMPENSATION PLANS (Employee Plans) (Details) (Two Thousand Twelve Equity Plan [Member]) | 12 Months Ended
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Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Stock Issued During Period, Shares, Restricted Stock Award, Gross | 300,000 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
Maximum [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 6,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = clf_TwoThousandTwelveEquityPlanMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Additional Restricted Stock Awards for New Employees [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Stock Issued During Period, Shares, Restricted Stock Award, Gross | 500,000 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross / us-gaap_AwardTypeAxis = clf_AdditionalRestrictedStockAwardsforNewEmployeesMember / us-gaap_PlanNameAxis = clf_TwoThousandTwelveEquityPlanMember

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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Data Type: | xbrli:sharesItemType
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Period Type: | instant

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- Definition Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration