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STOCK COMPENSATION PLANS STOCK COMPENSATION PLANS (Employee Plans) (Details) (Two Thousand Twelve Equity Plan [Member])
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12 Months Ended |
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Dec. 31, 2014
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Stock Issued During Period, Shares, Restricted Stock Award, Gross | 300,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross |
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Maximum [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |
6,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = clf_TwoThousandTwelveEquityPlanMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
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Additional Restricted Stock Awards for New Employees [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Stock Issued During Period, Shares, Restricted Stock Award, Gross |
500,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross / us-gaap_AwardTypeAxis = clf_AdditionalRestrictedStockAwardsforNewEmployeesMember / us-gaap_PlanNameAxis = clf_TwoThousandTwelveEquityPlanMember |
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- Details
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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). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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