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SEGMENT REPORTING (Narrative) (Details)
3 Months Ended
Mar. 31, 2013
Facility
U.S. Iron Ore [Member]
 
Segment Reporting Information [Line Items]  
Number of mines (in number of facilities) 5
Eastern Canadian Iron Ore [Member]
 
Segment Reporting Information [Line Items]  
Number of mines (in number of facilities) 2
North American Coal [Member] | Metallurgical Coal Mines [Member]
 
Segment Reporting Information [Line Items]  
Number of mines (in number of facilities) 6
North American Coal [Member] | Thermal Coal Mines [Member]
 
Segment Reporting Information [Line Items]  
Number of mines (in number of facilities) 1
Latin American Iron Ore [Member] | Amapa [Member]
 
Segment Reporting Information [Line Items]  
Interest Percentage 30.00%