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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Revenue Reimbursement) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Reimbursement Revenue | $ 392.9 us-gaap_ReimbursementRevenue | $ 344.8 us-gaap_ReimbursementRevenue | $ 351.8 us-gaap_ReimbursementRevenue
U.S. Iron Ore [Member] |  |  |
Reimbursement Revenue | 271.0 us-gaap_ReimbursementRevenue / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember | 259.5 us-gaap_ReimbursementRevenue / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember | 250.8 us-gaap_ReimbursementRevenue / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember
U.S. Iron Ore [Member] | Freight Revenue [Member] |  |  |
Reimbursement Revenue | 163.0 us-gaap_ReimbursementRevenue / clf_ReimbursementRevenueByTypeAxis = clf_FreightRevenueMember / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember | 177.3 us-gaap_ReimbursementRevenue / clf_ReimbursementRevenueByTypeAxis = clf_FreightRevenueMember / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember | 142.0 us-gaap_ReimbursementRevenue / clf_ReimbursementRevenueByTypeAxis = clf_FreightRevenueMember / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember
U.S. Iron Ore [Member] | Co-venturer [Member] |  |  |
Reimbursement Revenue | $ 108.0 us-gaap_ReimbursementRevenue / clf_ReimbursementRevenueByTypeAxis = us-gaap_CoVenturerMember / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember | $ 82.2 us-gaap_ReimbursementRevenue / clf_ReimbursementRevenueByTypeAxis = us-gaap_CoVenturerMember / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember | $ 108.8 us-gaap_ReimbursementRevenue / clf_ReimbursementRevenueByTypeAxis = us-gaap_CoVenturerMember / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember

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- Definition Repayment received or receivable for expenses incurred on behalf of a client or customer, other than those reimbursements received by landlords from tenants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 45 -Section 45 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=21915142&loc=d3e60722-111653 + Details
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- Details
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