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Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

v3.7.0.1
Document and Entity Information - shares
6 Months Ended
Jun. 30, 2017
Jul. 24, 2017
Document and Entity Information [Abstract] Ìý Ìý
Entity Registrant Name CLIFFS NATURAL RESOURCES INC. Ìý
Entity Central Index Key 0000764065 Ìý
Current Fiscal Year End Date --12-31 Ìý
Entity Filer Category Large Accelerated Filer Ìý
Document Type 10-Q Ìý
Document Period End Date Jun. 30, 2017 Ìý
Document Fiscal Year Focus 2017 Ìý
Document Fiscal Period Focus Q2 Ìý
Amendment Flag false Ìý
Entity Common Stock, Shares Outstanding Ìý 296,506,003
Trading Symbol clf Ìý