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Quarterly report pursuant to Section 13 or 15(d)

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

v2.4.1.9
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] Ìý Ìý
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