Annual report pursuant to Section 13 and 15(d)

CASH FLOW INFORMATION (Reconciliation Of Capital Additions To Cash Paid For Capital Expenditures) (Details)

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12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Payments To Acquire Property Plant And Equipment Net $ 284.1clf_PaymentsToAcquirePropertyPlantAndEquipmentNet $ 861.6clf_PaymentsToAcquirePropertyPlantAndEquipmentNet $ 1,127.5clf_PaymentsToAcquirePropertyPlantAndEquipmentNet
Property, Plant and Equipment, Additions 235.5us-gaap_PropertyPlantAndEquipmentAdditions 752.3us-gaap_PropertyPlantAndEquipmentAdditions 1,335.3us-gaap_PropertyPlantAndEquipmentAdditions
Non-cash accruals (58.5)us-gaap_CapitalExpendituresIncurredButNotYetPaid (109.3)us-gaap_CapitalExpendituresIncurredButNotYetPaid 152.5us-gaap_CapitalExpendituresIncurredButNotYetPaid
Capital leases 9.9us-gaap_CapitalLeaseObligationsIncurred 0us-gaap_CapitalLeaseObligationsIncurred 55.3us-gaap_CapitalLeaseObligationsIncurred
Total $ (48.6)clf_CapitalExpendituresIncurredButNotYetPaidAndCapitalLeaseObligationsIncurred $ (109.3)clf_CapitalExpendituresIncurredButNotYetPaidAndCapitalLeaseObligationsIncurred $ 207.8clf_CapitalExpendituresIncurredButNotYetPaidAndCapitalLeaseObligationsIncurred