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STOCK COMPENSATION PLANS STOCK COMPENSATION PLANS (Nonemployee Directors) (Details) (Directors Plan [Member], USD $)
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3 Months Ended | 12 Months Ended | |
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Dec. 31, 2014
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Sep. 30, 2014
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Dec. 31, 2014
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Period from Date of Election, at End of Such Director is Required to Hold Certain Number of Shares | 5 years | ||
| Deferred Compensation Arrangement with Individual, Fair Value of Shares Issued | $ 250,000us-gaap_DeferredCompensationArrangementWithIndividualFairValueOfSharesIssued | ||
| Stock Issued During Period Value Director Stock Award | $ 42,500clf_StockIssuedDuringPeriodValueDirectorStockAward | $ 42,500clf_StockIssuedDuringPeriodValueDirectorStockAward | $ 85,000clf_StockIssuedDuringPeriodValueDirectorStockAward |
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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 |
300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = clf_DirectorsPlanMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = clf_DirectorsPlanMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
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- Definition
Period from Date of Election, at End of Such Director is Required to Hold Certain Number of Shares No definition available.
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- Definition
Stock Issued During Period Value Director Stock Award No definition available.
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- Definition
The total fair value of shares issued during the period under a deferred compensation arrangement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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