Quarterly report pursuant to Section 13 or 15(d)

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

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 3 Months Ended
Mar. 31, 2018
Northshore [Member]  
Related Party Transaction [Line Items]  
Entity Address, State or Province Minnesota
United Taconite [Member]  
Related Party Transaction [Line Items]  
Entity Address, State or Province Minnesota
Tilden [Member]  
Related Party Transaction [Line Items]  
Entity Address, State or Province Michigan
Empire [Member]  
Related Party Transaction [Line Items]  
Entity Address, State or Province Michigan
Koolyanobbing [Member]  
Related Party Transaction [Line Items]  
Entity Address, State or Province Western Australia