Annual report pursuant to Section 13 and 15(d)

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

betfred sportsbook review|Welcome_EARNINGS PER SHARE (Earnings v3.6.0.2
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 12 Months Ended
Dec. 31, 2016
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
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