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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Tables)
9 Months Ended
Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Equity Method Investments Investees and equity ownership percentages are presented below:
InvesteeSegment Reported WithinEquity Ownership Percentage
Combined Metals of Chicago, LLCSteel and Manufacturing40.0%
Hibbing Taconite CompanyMining and Pelletizing23.0%
Spartan Steel Coating, LLCSteel and Manufacturing48.0%