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CASH FLOW INFORMATION (Reconciliation Of Capital Additions To Cash Paid For Capital Expenditures) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Supplemental Cash Flow Information [Abstract]    
Capital Additions $ 26.1clf_PropertyPlantandEquipmentAdditionsIncludingDiscontinuedOperations $ 79.2clf_PropertyPlantandEquipmentAdditionsIncludingDiscontinuedOperations
Cash Paid for Capital Expenditures 15.9us-gaap_PaymentsToAcquirePropertyPlantAndEquipment 103.3us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Non-cash accruals 10.2us-gaap_CapitalExpendituresIncurredButNotYetPaid (34.0)us-gaap_CapitalExpendituresIncurredButNotYetPaid
Capital leases 0us-gaap_CapitalLeaseObligationsIncurred 9.9us-gaap_CapitalLeaseObligationsIncurred
Total $ 10.2clf_CapitalExpendituresIncurredButNotYetPaidAndCapitalLeaseObligationsIncurred $ (24.1)clf_CapitalExpendituresIncurredButNotYetPaidAndCapitalLeaseObligationsIncurred