STOCK COMPENSATION PLANS (Narrative) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified |
3 Months Ended |
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Mar. 31, 2015
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | Ìý |
Option Indexed to Issuer's Equity, Strike Price | $ 7.70us-gaap_OptionIndexedToIssuersEquityStrikePrice1 |
2012 Equity Plan [Member] | Ìý |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | Ìý |
Performance/vesting period | 3 years |
2015 to 2017 Performance Period [Member] | 2012 Equity Plan [Member] | Minimum [Member] | Ìý |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | Ìý |
Payout rate, as a percentage of the original grant |
0.00%clf_ShareBasedGoodsAndNonemployeeServicesTransactionValuationMethodPayoutRate / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = clf_A2015to2017PerformancePeriodMember / us-gaap_PlanNameAxis = clf_TwoThousandTwelveEquityPlanandAmendedEquityPlanMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
2015 to 2017 Performance Period [Member] | 2012 Equity Plan [Member] | Maximum [Member] | Ìý |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | Ìý |
Payout rate, as a percentage of the original grant |
200.00%clf_ShareBasedGoodsAndNonemployeeServicesTransactionValuationMethodPayoutRate / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = clf_A2015to2017PerformancePeriodMember / us-gaap_PlanNameAxis = clf_TwoThousandTwelveEquityPlanandAmendedEquityPlanMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Performance Shares [Member] | 2012 Amended Equity Plan [Member] | Ìý |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | Ìý |
Number of performance shares granted |
0.9us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_PlanNameAxis = clf_A2012AmendedEquityPlanMember |
Employee Stock Option [Member] | 2012 Amended Equity Plan [Member] | Ìý |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | Ìý |
Number of performance shares granted |
0.4us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = clf_A2012AmendedEquityPlanMember |
Restricted Stock Units (RSUs) [Member] | 2012 Amended Equity Plan [Member] | Ìý |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | Ìý |
Number of restricted shares granted |
0.9us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = clf_A2012AmendedEquityPlanMember |
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- Definition
Share Based Goods and Nonemployee Services Transaction Valuation Method, Payout Rate No definition available.
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- Definition
Exercise or strike price stated in the contract for options indexed to the issuer's equity shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. 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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- Definition
Gross number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP). Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. No definition available.
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