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DEBT AND CREDIT FACILITIES (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2015 | Mar. 30, 2015 | Dec. 31, 2014
Line of Credit Facility [Line Items] |  |  |  |  |
Letters of credit outstanding | $ 136.2 us-gaap_LettersOfCreditOutstandingAmount |  |  | $ 149.5 us-gaap_LettersOfCreditOutstandingAmount |
Five hundred forty million Eight point two five Twenty twenty First Lien Notes [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Stated interest rate | 8.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = clf_FivehundredfortymillionEightpointtwofiveTwentytwentyFirstLienNotesMember |  |  |  |
Repurchase Price of $540M 8.25% Notes if Triggering Event Occurs | 1.01 clf_RepurchasePriceof540M8.25NotesifTriggeringEventOccurs / us-gaap_DebtInstrumentAxis = clf_FivehundredfortymillionEightpointtwofiveTwentytwentyFirstLienNotesMember |  |  |  |
Initial Redemption Price | 1.0825 clf_InitialRedemptionPrice / us-gaap_DebtInstrumentAxis = clf_FivehundredfortymillionEightpointtwofiveTwentytwentyFirstLienNotesMember |  |  |  |
Redemption Price after 2018 | 1 clf_RedemptionPriceafter2018 / us-gaap_DebtInstrumentAxis = clf_FivehundredfortymillionEightpointtwofiveTwentytwentyFirstLienNotesMember |  |  |  |
Redemption Price from time to time and Prior to March 31, 2018 | 1 clf_RedemptionPricefromtimetotimeandPriortoMarch312018 / us-gaap_DebtInstrumentAxis = clf_FivehundredfortymillionEightpointtwofiveTwentytwentyFirstLienNotesMember |  |  |  |
Amount in aggregate that can be redeemed on or prior to March 31, 2018 | 0.35 clf_AmountinaggregatethatcanberedeemedonorpriortoMarch312018 / us-gaap_DebtInstrumentAxis = clf_FivehundredfortymillionEightpointtwofiveTwentytwentyFirstLienNotesMember |  |  |  |
Redemption Price of 35 percent or less of Outstanding | 1.0825 clf_RedemptionPriceof35percentorlessofOutstanding / us-gaap_DebtInstrumentAxis = clf_FivehundredfortymillionEightpointtwofiveTwentytwentyFirstLienNotesMember |  |  |  |
Amount to Remain Outstanding Prior to March 31, 2018 | 0.65 clf_AmounttoRemainOutstandingPriortoMarch312018 / us-gaap_DebtInstrumentAxis = clf_FivehundredfortymillionEightpointtwofiveTwentytwentyFirstLienNotesMember |  |  |  |
In the Event of Default Amount that will Accelerate | 0.25 clf_IntheEventofDefaultAmountthatwillAccelerate / us-gaap_DebtInstrumentAxis = clf_FivehundredfortymillionEightpointtwofiveTwentytwentyFirstLienNotesMember |  |  |  |
Debt Instrument, Par Value | 540.0 clf_DebtInstrumentParValue / us-gaap_DebtInstrumentAxis = clf_FivehundredfortymillionEightpointtwofiveTwentytwentyFirstLienNotesMember |  |  |  |
Five hundred Forty-four Million Seven Point Seven Five Twenty Twenty Second Lien Notes [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Stated interest rate | 7.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = clf_FivehundredFortyfourMillionSevenPointSevenFiveTwentyTwentySecondLienNotesMember |  |  |  |
Initial Redemption Price | 1.03875 clf_InitialRedemptionPrice / us-gaap_DebtInstrumentAxis = clf_FivehundredFortyfourMillionSevenPointSevenFiveTwentyTwentySecondLienNotesMember |  |  |  |
Redemption Price beginning March 31, 2019 | 1 clf_RedemptionPricebeginningMarch312019 / us-gaap_DebtInstrumentAxis = clf_FivehundredFortyfourMillionSevenPointSevenFiveTwentyTwentySecondLienNotesMember |  |  |  |
Redemption Price from time to time and Prior to March 31, 2017 | 1 clf_RedemptionPricefromtimetotimeandPriortoMarch312017 / us-gaap_DebtInstrumentAxis = clf_FivehundredFortyfourMillionSevenPointSevenFiveTwentyTwentySecondLienNotesMember |  |  |  |
Amount in aggregate that can be redeemed on or prior to March 31, 2017 | 0.35 clf_AmountinaggregatethatcanberedeemedonorpriortoMarch312017 / us-gaap_DebtInstrumentAxis = clf_FivehundredFortyfourMillionSevenPointSevenFiveTwentyTwentySecondLienNotesMember |  |  |  |
Redemption Price of 35 percent or less of Outstanding | 1.0775 clf_RedemptionPriceof35percentorlessofOutstanding / us-gaap_DebtInstrumentAxis = clf_FivehundredFortyfourMillionSevenPointSevenFiveTwentyTwentySecondLienNotesMember |  |  |  |
Amount to Remain Outstanding Prior to March 31, 2018 | 0.65 clf_AmounttoRemainOutstandingPriortoMarch312018 / us-gaap_DebtInstrumentAxis = clf_FivehundredFortyfourMillionSevenPointSevenFiveTwentyTwentySecondLienNotesMember |  |  |  |
Debt Instrument, Par Value | 544.2 clf_DebtInstrumentParValue / us-gaap_DebtInstrumentAxis = clf_FivehundredFortyfourMillionSevenPointSevenFiveTwentyTwentySecondLienNotesMember |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Revolving credit facility, borrowing capacity | 441.1 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |
Credit facility, amount outstanding | 0 us-gaap_LineOfCredit / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember | [1] |  | 0 us-gaap_LineOfCredit / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember | [2]
Debt Instrument, Par Value | 550.0 clf_DebtInstrumentParValue / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember |  | 900.0 clf_DebtInstrumentParValue / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember | 1,125.0 clf_DebtInstrumentParValue / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember |
U.S. Tranche | 450.0 clf_U.S.Tranche / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |
Sublimit for Issuers of Letters of Credit for U.S. Tranche | 250.0 clf_SublimitforIssuersofLettersofCreditforU.S.Tranche / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |
Sublimit for U.S. Swingline Loans | 100.0 clf_SublimitforU.S.SwinglineLoans / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |
Australian Tranche | 100.0 clf_AustralianTranche / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |
Sublimit for Issuance of Letters of Credit for Australian Tranche | 50.0 clf_SublimitforIssuanceofLettersofCreditforAustralianTranche / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |
Sublimit for Australian Swingline Loans | 20.0 clf_SublimitforAustralianSwinglineLoans / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |
Credit facility remaining capacity | 299.4 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember |  |  | 975.5 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember |
LIBOR Rate Based on a One-month interest period plus 1 percent | 0.01 clf_LIBORRateBasedonaOnemonthinterestperiodplus1percent / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |
Fixed Charge Coverage Ratio | 1.0 clf_FixedChargeCoverageRatio / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |
Letters of credit outstanding | 136.2 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember |  |  | 149.5 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember |
Foreign Exchange Hedge Obligations | $ 5.5 clf_ForeignExchangeHedgeObligations / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |
Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Base Rate | 0.005 clf_BaseRate / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |
Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Base Rate | 0.01 clf_BaseRate / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |
[1] | As of March 31, 2015, no loans were drawn under the ABL Facility and we had total availability of $441.1 million as a result of borrowing base limitations. As of March 31, 2015, the principal amount of letter of credit obligations totaled $136.2 million and foreign exchange hedge obligations totaled $5.5 million, thereby further reducing available borrowing capacity on our ABL Facility to $299.4 million.
[2] | As of December 31, 2014, we had no revolving loans drawn under the revolving credit agreement of which had $1.125 billion availability. As of December 31, 2014, the principal amount of letter of credit obligations totaled $149.5 million, thereby further reducing available borrowing capacity on the revolving credit agreement to $975.5 million.

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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