Quarterly report pursuant to Section 13 or 15(d)

Acquisitions And Other Investments (Schedule Of Unaudited Consolidated Proforma Information) (Detail)

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3 Months Ended 9 Months Ended
Sep. 30, 2011
Sep. 30, 2011
Consolidated Thompson [Member]
   
Business Acquisition [Line Items]    
REVENUES FROM PRODUCT SALES AND SERVICES $ 2,089.1 $ 5,168.6
NET INCOME ATTRIBUTABLE TO CLIFFS SHAREHOLDERS $ 607.3 $ 1,439.2
EARNINGS PER COMMON SHARE ATTRIBUTABLE TO CLIFFS SHAREHOLDERS - BASIC $ 4.21 $ 10.31
EARNINGS PER COMMON SHARE ATTRIBUTABLE TO CLIFFS SHAREHOLDERS - DILUTED $ 4.19 $ 10.26