Quarterly report pursuant to Section 13 or 15(d)

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

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6 Months Ended
Jun. 30, 2018
Northshore  
Related Party Transaction [Line Items]  
Entity Address, State or Province Minnesota
United Taconite  
Related Party Transaction [Line Items]  
Entity Address, State or Province Minnesota
Tilden  
Related Party Transaction [Line Items]  
Entity Address, State or Province Michigan
Empire  
Related Party Transaction [Line Items]  
Entity Address, State or Province Michigan
Koolyanobbing  
Related Party Transaction [Line Items]  
Entity Address, State or Province Western Australia