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Quarterly report pursuant to Section 13 or 15(d)

SEGMENT REPORTING (Schedule Of Segment Reporting Information, By Segment) (Details)

v2.4.1.9
SEGMENT REPORTING (Schedule Of Segment Reporting Information, By Segment) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Segment Reporting Information [Line Items] Ìý Ìý
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest $ (761.7)us-gaap_ProfitLoss $ (70.7)us-gaap_ProfitLoss
Revenues from producet sales and services, percent 100.00%clf_PercentageOfSegmentRevenue 100.00%clf_PercentageOfSegmentRevenue
Revenues from product sales and services 446.0us-gaap_Revenues 615.5us-gaap_Revenues
Sales Margin 80.8us-gaap_GrossProfit 190.0us-gaap_GrossProfit
Other operating expense (8.9)us-gaap_OperatingExpenses (50.8)us-gaap_OperatingExpenses
Other expense 270.0us-gaap_NonoperatingIncomeExpense (39.6)us-gaap_NonoperatingIncomeExpense
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES AND EQUITY LOSS FROM VENTURES 341.9us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 99.6us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Depreciation, depletion and amortization 33.0us-gaap_DepreciationDepletionAndAmortization 141.1us-gaap_DepreciationDepletionAndAmortization
Depreciation, Depletion and Amortization excluding Depreciation, Amortization and Depletion expense for Discontinued Operations 29.8clf_DepreciationDepletionandAmortizationexcludingDepreciationAmortizationandDepletionexpenseforDiscontinuedOperations 69.7clf_DepreciationDepletionandAmortizationexcludingDepreciationAmortizationandDepletionexpenseforDiscontinuedOperations
EBITDA (509.5)clf_EBITDA 91.3clf_EBITDA
Capital Additions 13.3us-gaap_PropertyPlantAndEquipmentAdditions [1] 19.0us-gaap_PropertyPlantAndEquipmentAdditions [1]
Interest Income (Expense), net, including Discontinued Operations (44.2)clf_InterestIncomeExpensenetincludingDiscontinuedOperations (42.7)clf_InterestIncomeExpensenetincludingDiscontinuedOperations
Income Tax Expense (Benefit), including Discontinued Operations (175.0)clf_IncomeTaxExpenseBenefitincludingDiscontinuedOperations 21.8clf_IncomeTaxExpenseBenefitincludingDiscontinuedOperations
Gain on extinguishment of debt 313.7us-gaap_GainsLossesOnExtinguishmentOfDebt 0us-gaap_GainsLossesOnExtinguishmentOfDebt
Adjusted EBITDA 94.4clf_AdjustedEBITDA 208.6clf_AdjustedEBITDA
U.S. Iron Ore [Member] Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý
Revenues from producet sales and services, percent 70.00%clf_PercentageOfSegmentRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= clf_USIronOreMember
59.00%clf_PercentageOfSegmentRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= clf_USIronOreMember
Revenues from product sales and services 311.8us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= clf_USIronOreMember
361.3us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= clf_USIronOreMember
Sales Margin 80.0us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= clf_USIronOreMember
95.0us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= clf_USIronOreMember
Depreciation, depletion and amortization 21.7us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= clf_USIronOreMember
28.7us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= clf_USIronOreMember
EBITDA 101.6clf_EBITDA
/ us-gaap_StatementBusinessSegmentsAxis
= clf_USIronOreMember
123.6clf_EBITDA
/ us-gaap_StatementBusinessSegmentsAxis
= clf_USIronOreMember
Capital Additions 9.5us-gaap_PropertyPlantAndEquipmentAdditions
/ us-gaap_StatementBusinessSegmentsAxis
= clf_USIronOreMember
[1] 14.9us-gaap_PropertyPlantAndEquipmentAdditions
/ us-gaap_StatementBusinessSegmentsAxis
= clf_USIronOreMember
[1]
Adjusted EBITDA 105.1clf_AdjustedEBITDA
/ us-gaap_StatementBusinessSegmentsAxis
= clf_USIronOreMember
128.7clf_AdjustedEBITDA
/ us-gaap_StatementBusinessSegmentsAxis
= clf_USIronOreMember
Asia Pacific Iron Ore [Member] Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý
Revenues from producet sales and services, percent 30.00%clf_PercentageOfSegmentRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= clf_AsiaPacificIronOreMember
41.00%clf_PercentageOfSegmentRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= clf_AsiaPacificIronOreMember
Revenues from product sales and services 134.2us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= clf_AsiaPacificIronOreMember
254.2us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= clf_AsiaPacificIronOreMember
Sales Margin 0.8us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= clf_AsiaPacificIronOreMember
66.3us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= clf_AsiaPacificIronOreMember
Depreciation, depletion and amortization 6.3us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= clf_AsiaPacificIronOreMember
39.1us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= clf_AsiaPacificIronOreMember
EBITDA 18.0clf_EBITDA
/ us-gaap_StatementBusinessSegmentsAxis
= clf_AsiaPacificIronOreMember
85.3clf_EBITDA
/ us-gaap_StatementBusinessSegmentsAxis
= clf_AsiaPacificIronOreMember
Capital Additions 3.4us-gaap_PropertyPlantAndEquipmentAdditions
/ us-gaap_StatementBusinessSegmentsAxis
= clf_AsiaPacificIronOreMember
[1] 3.2us-gaap_PropertyPlantAndEquipmentAdditions
/ us-gaap_StatementBusinessSegmentsAxis
= clf_AsiaPacificIronOreMember
[1]
Adjusted EBITDA 5.7clf_AdjustedEBITDA
/ us-gaap_StatementBusinessSegmentsAxis
= clf_AsiaPacificIronOreMember
99.1clf_AdjustedEBITDA
/ us-gaap_StatementBusinessSegmentsAxis
= clf_AsiaPacificIronOreMember
Discontinued Operations [Member] Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý
Eliminations with Discontinued Operations 0clf_EliminationswithDiscontinuedOperations
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_SegmentDiscontinuedOperationsMember
28.7clf_EliminationswithDiscontinuedOperations
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_SegmentDiscontinuedOperationsMember
All Other Segments [Member] Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý
Depreciation, depletion and amortization 1.8us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
1.9us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
Capital Additions 0.4us-gaap_PropertyPlantAndEquipmentAdditions
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
[1] 0.9us-gaap_PropertyPlantAndEquipmentAdditions
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
[1]
Other Segment [Member] Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý
EBITDA (629.1)clf_EBITDA
/ us-gaap_StatementBusinessSegmentsAxis
= clf_OtherSegmentMember
(117.6)clf_EBITDA
/ us-gaap_StatementBusinessSegmentsAxis
= clf_OtherSegmentMember
Adjusted EBITDA (16.4)clf_AdjustedEBITDA
/ us-gaap_StatementBusinessSegmentsAxis
= clf_OtherSegmentMember
(19.2)clf_AdjustedEBITDA
/ us-gaap_StatementBusinessSegmentsAxis
= clf_OtherSegmentMember
EBITDA Calculation [Member] Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý
Depreciation, depletion and amortization (33.0)us-gaap_DepreciationDepletionAndAmortization
/ clf_EBITDACalculationAxis
= clf_EBITDACalculationMember
(141.1)us-gaap_DepreciationDepletionAndAmortization
/ clf_EBITDACalculationAxis
= clf_EBITDACalculationMember
Adjusted EBITDA Calculation [Member] Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý
Impact of Discontinued Operations (924.1)clf_ImpactofDiscontinuedOperations
/ clf_AdjustedEBITACalculationAxis
= clf_AdjustedEBITDACalculationMember
(118.1)clf_ImpactofDiscontinuedOperations
/ clf_AdjustedEBITACalculationAxis
= clf_AdjustedEBITDACalculationMember
North American Coal Impact (5.5)clf_NorthAmericanCoalImpact
/ clf_AdjustedEBITACalculationAxis
= clf_AdjustedEBITDACalculationMember
18.2clf_NorthAmericanCoalImpact
/ clf_AdjustedEBITACalculationAxis
= clf_AdjustedEBITDACalculationMember
Foreign Exchange Remeasurement 13.5clf_ForeignExchangeRemeasurement
/ clf_AdjustedEBITACalculationAxis
= clf_AdjustedEBITDACalculationMember
(11.4)clf_ForeignExchangeRemeasurement
/ clf_AdjustedEBITACalculationAxis
= clf_AdjustedEBITDACalculationMember
Severance Costs in SG&A $ (1.5)clf_SeveranceCostsinSGA
/ clf_AdjustedEBITACalculationAxis
= clf_AdjustedEBITDACalculationMember
$ (6.0)clf_SeveranceCostsinSGA
/ clf_AdjustedEBITACalculationAxis
= clf_AdjustedEBITDACalculationMember
[1] Includes capital lease additions and non-cash accruals. Refer to NOTE 17 - CASH FLOW INFORMATION.