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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
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Mar. 31, 2015 | Mar. 31, 2014
Supplemental Cash Flow Information [Abstract] |  |
Capital Additions | $ 26.1 clf_PropertyPlantandEquipmentAdditionsIncludingDiscontinuedOperations | $ 79.2 clf_PropertyPlantandEquipmentAdditionsIncludingDiscontinuedOperations
Cash Paid for Capital Expenditures | 15.9 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | 103.3 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Non-cash accruals | 10.2 us-gaap_CapitalExpendituresIncurredButNotYetPaid | (34.0)us-gaap_CapitalExpendituresIncurredButNotYetPaid
Capital leases | 0 us-gaap_CapitalLeaseObligationsIncurred | 9.9 us-gaap_CapitalLeaseObligationsIncurred
Total | $ 10.2 clf_CapitalExpendituresIncurredButNotYetPaidAndCapitalLeaseObligationsIncurred | $ (24.1)clf_CapitalExpendituresIncurredButNotYetPaidAndCapitalLeaseObligationsIncurred

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- Definition Future cash outflow to pay for purchases of fixed assets that have occurred and the increase during the period in capital lease obligations due to entering into new capital leases. + References No definition available. + Details
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- Definition Property, Plant and Equipment, Additions, Including Discontinued Operations + References No definition available. + Details
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- Definition Future cash outflow to pay for purchases of fixed assets that have occurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition The increase during the period in capital lease obligations due to entering into new capital leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Details
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