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SEGMENT REPORTING (Narrative) (Details)
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3 Months Ended |
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Mar. 31, 2015
Facility
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| U.S. Iron Ore [Member] | |
| Segment Reporting Information [Line Items] | |
| Number of mines (in number of facilities) |
5clf_NumberOfMines / us-gaap_StatementBusinessSegmentsAxis = clf_USIronOreMember |
| Asia Pacific Iron Ore [Member] | |
| Segment Reporting Information [Line Items] | |
| Number of mines (in number of facilities) |
1clf_NumberOfMines / us-gaap_StatementBusinessSegmentsAxis = clf_AsiaPacificIronOreMember |
| X | ||||||||||
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- Definition
Number of mines No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Details
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