Annual report pursuant to Section 13 and 15(d)

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

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 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Related Party Transaction [Line Items]    
Noncontrolling Interest, Ownership Percentage by Parent 100.00%  
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  
Noncontrolling Interest, Ownership Percentage by Parent   100.00%
Empire [Member]    
Related Party Transaction [Line Items]    
Entity Address, State or Province Michigan  
Noncontrolling Interest, Ownership Percentage by Parent   100.00%