SUBSEQUENT EVENTS Narrative (Details) (USD $)
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12 Months Ended | 11 Months Ended | |||||
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Dec. 31, 2014
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Dec. 31, 2015
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Dec. 31, 2013
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Jan. 26, 2015
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Sep. 30, 2014
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May 31, 2015
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Jan. 22, 2015
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Subsequent Event [Line Items] | |||||||
Debt Instrument, Par Value | $ 4,144,800,000clf_DebtInstrumentParValue | $ 4,814,800,000clf_DebtInstrumentParValue | |||||
Estimated Capital Costs to Develop Bloom Lake Phase II | 1,200,000,000clf_EstimatedCapitalCoststoDevelopBloomLakePhaseII | ||||||
Elimination of Dividend [Member] | |||||||
Subsequent Event [Line Items] | |||||||
Elimination of Dividend |
$ 0.15clf_EliminationofDividend / us-gaap_SubsequentEventTypeAxis = clf_EliminationofDividendMember |
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Free Cash Flow Due to Quarterly Dividend Elimination |
92,000,000clf_FreeCashFlowDuetoQuarterlyDividendElimination / us-gaap_SubsequentEventTypeAxis = clf_EliminationofDividendMember |
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Revolving Credit Facility [Member] | |||||||
Subsequent Event [Line Items] | |||||||
Debt Instrument, Par Value |
1,125,000,000clf_DebtInstrumentParValue / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember |
1,750,000,000clf_DebtInstrumentParValue / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember |
1,250,000,000clf_DebtInstrumentParValue / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember |
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Revolving Credit Facility [Member] | Revolving Credit Facility [Member] | |||||||
Subsequent Event [Line Items] | |||||||
Debt Instrument, Face Amount, Subsequent Event - Revolving Credit Facility Amendment |
750,000,000clf_DebtInstrumentFaceAmountSubsequentEventRevolvingCreditFacilityAmendment / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_SubsequentEventTypeAxis = us-gaap_RevolvingCreditFacilityMember |
900,000,000clf_DebtInstrumentFaceAmountSubsequentEventRevolvingCreditFacilityAmendment / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_SubsequentEventTypeAxis = us-gaap_RevolvingCreditFacilityMember |
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Permit Costs and Expenses in connection with Canadian Restructuring EBITDA Add back- Subsequent Event - Revolving Credit Facility Amendment |
$ 75,000,000clf_PermitCostsandExpensesinconnectionwithCanadianRestructuringEBITDAAddbackSubsequentEventRevolvingCreditFacilityAmendment / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_SubsequentEventTypeAxis = us-gaap_RevolvingCreditFacilityMember |
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Limit on Dividend per Share - Subsequent Event - Revolving Credit Facility Amendment |
$ 0.01clf_LimitonDividendperShareSubsequentEventRevolvingCreditFacilityAmendment / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_SubsequentEventTypeAxis = us-gaap_RevolvingCreditFacilityMember |
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- Definition
Debt Instrument, Face Amount, Subsequent Event - Revolving Credit Facility Amendment No definition available.
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X | ||||||||||
- Definition
Debt Instrument, Par Value No definition available.
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X | ||||||||||
- Definition
Elimination of Dividend No definition available.
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X | ||||||||||
- Definition
Estimated Capital Costs to Developing Bloom Lake Phase II No definition available.
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X | ||||||||||
- Definition
Free Cash Flow Due to Quarterly Dividend Elimination No definition available.
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X | ||||||||||
- Definition
Limit on Quarterly Dividend per Share - Subsequent Event - Revolving Credit Facility Amendment No definition available.
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X | ||||||||||
- Definition
Permit Costs and Expenses in connection with Canadian Restructuring EBITDA Add back - Subsequent Event - Revolving Credit Facility Amendment No definition available.
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X | ||||||||||
- Details
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- Details
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- Details
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