Quarterly report pursuant to Section 13 or 15(d)

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Equity Method Investments) (Details) (Details)

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Mar. 31, 2020
Combined Metals of Chicago, LLC [Member]  
Schedule of Equity Method Investments [Line Items]  
Equity Method Investment, Ownership Percentage 40.00%
Hibbing Taconite Company [Member]  
Schedule of Equity Method Investments [Line Items]  
Equity Method Investment, Ownership Percentage 23.00%
Spartan Steel Coating, LLC [Member]  
Schedule of Equity Method Investments [Line Items]  
Equity Method Investment, Ownership Percentage 48.00%