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v2.4.1.9

RELATED PARTIES (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 Facility | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |
Due from Related Parties, Current | 151.1 us-gaap_DueFromRelatedPartiesCurrent | $ 132.0 us-gaap_DueFromRelatedPartiesCurrent
Due to Related Parties, Current | 13.6 us-gaap_DueToRelatedPartiesCurrent | $ 25.1 us-gaap_DueToRelatedPartiesCurrent
U.S. Iron Ore [Member] |  |
Segment Reporting Information [Line Items] |  |
Number Of Mines | 5 clf_NumberOfMines / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember |
Eastern Canadian Iron Ore [Member] |  |
Segment Reporting Information [Line Items] |  |
Number Of Mines | 2 clf_NumberOfMines / us-gaap_StatementBusinessSegmentsAxis = clf_EasternCanadianIronOreMember |
Joint Venture Partners [Member] | U.S. Iron Ore [Member] |  |
Segment Reporting Information [Line Items] |  |
Number Of Mines | 3 clf_NumberOfMines / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_CoVenturerMember / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember |
Joint Venture Partners [Member] | Eastern Canadian Iron Ore [Member] |  |
Segment Reporting Information [Line Items] |  |
Number Of Mines | 1 clf_NumberOfMines / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_CoVenturerMember / us-gaap_StatementBusinessSegmentsAxis = clf_EasternCanadianIronOreMember |

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- Definition The aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due within one year (or one business cycle). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph k -Subparagraph 2 -Article 4 + Details
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