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Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.1
BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Equity Method Investments) (Details) (Details)
Mar. 31, 2020
Combined Metals of Chicago, LLC [Member] Ìý
Schedule of Equity Method Investments [Line Items] Ìý
Equity Method Investment, Ownership Percentage 40.00%
Hibbing Taconite Company [Member] Ìý
Schedule of Equity Method Investments [Line Items] Ìý
Equity Method Investment, Ownership Percentage 23.00%
Spartan Steel Coating, LLC [Member] Ìý
Schedule of Equity Method Investments [Line Items] Ìý
Equity Method Investment, Ownership Percentage 48.00%