Annual report pursuant to Section 13 and 15(d)

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Schedule Of Subsidiaries) (Details)

betfred games-free to play_to Section 13 and 15(d) v3.3.1.900
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 12 Months Ended
Dec. 31, 2015
Dec. 31, 2013
Northshore [Member]    
Related Party Transaction [Line Items]    
Entity Address, State or Province Minnesota  
Noncontrolling Interest, Ownership Percentage by Parent 100.00%  
Segment Reporting Information, Description of Products and Services Iron Ore  
United Taconite [Member]    
Related Party Transaction [Line Items]    
Entity Address, State or Province Minnesota  
Noncontrolling Interest, Ownership Percentage by Parent 100.00%  
Segment Reporting Information, Description of Products and Services Iron Ore  
Bloom Lake [Member]    
Related Party Transaction [Line Items]    
Noncontrolling Interest, Ownership Percentage by Parent   82.80%
Tilden [Member]    
Related Party Transaction [Line Items]    
Entity Address, State or Province Michigan  
Noncontrolling Interest, Ownership Percentage by Parent 85.00%  
Segment Reporting Information, Description of Products and Services Iron Ore  
Empire [Member]    
Related Party Transaction [Line Items]    
Entity Address, State or Province Michigan  
Noncontrolling Interest, Ownership Percentage by Parent 79.00%  
Segment Reporting Information, Description of Products and Services Iron Ore  
Koolyanobbing [Member]    
Related Party Transaction [Line Items]    
Entity Address, State or Province Western Australia  
Noncontrolling Interest, Ownership Percentage by Parent 100.00%  
Segment Reporting Information, Description of Products and Services Iron Ore