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, 2019
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Entity Address, State or Province OH
Northshore  
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Entity Address, State or Province MN
United Taconite  
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Entity Address, State or Province MN
Tilden  
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Entity Address, State or Province MI
Empire  
Related Party Transaction [Line Items]  
Entity Address, State or Province MI
Metallics  
Related Party Transaction [Line Items]  
Entity Address, State or Province OH