Annual report pursuant to Section 13 and 15(d)

Acquisitions And Other Investments (Schedule Of Unaudited Consolidated Proforma Information Table Text Block) (Details)

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betfred games
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Consolidated Thompson [Member]
   
Business Acquisition [Line Items]    
REVENUES FROM PRODUCT SALES AND SERVICES $ 7,002.7 $ 4,982.9
NET INCOME ATTRIBUTABLE TO CLIFFS SHAREHOLDERS $ 1,612.3 $ 912.5
EARNINGS PER COMMON SHARE ATTRIBUTABLE TO CLIFFS SHAREHOLDERS - BASIC $ 11.50 $ 6.74
EARNINGS PER COMMON SHARE ATTRIBUTABLE TO CLIFFS SHAREHOLDERS - DILUTED $ 11.43 $ 6.70