Quarterly report pursuant to Section 13 or 15(d)

SEGMENT REPORTING Segment Reporting (Summary of Assets by Segment) (Details)

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Sep. 30, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]    
Assets $ 13,566.7 $ 13,574.9
betfred gamesU.S. Iron Ore [Member]
   
Segment Reporting Information [Line Items]    
Assets 1,770.6 1,735.1
Eastern Canadian Iron Ore [Member]
   
Segment Reporting Information [Line Items]    
Assets 7,982.7 7,605.1
Asia Pacific Iron Ore [Member]
   
Segment Reporting Information [Line Items]    
Assets 1,188.7 1,506.3
North American Coal [Member]
   
Segment Reporting Information [Line Items]    
Assets 1,831.8 1,877.8
All Other Segments [Member]
   
Segment Reporting Information [Line Items]    
Assets 696.5 570.9
Total Segment Assets [Member]
   
Segment Reporting Information [Line Items]    
Assets 13,470.3 13,295.2
Corporate [Member]
   
Segment Reporting Information [Line Items]    
Assets $ 96.4 $ 279.7