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Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.2
BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Equity Method Investments (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Mar. 13, 2020
Combined Metals of Chicago, LLC [Member] Ìý Ìý
Schedule of Equity Method Investments [Line Items] Ìý Ìý
Equity Method Investment, Ownership Percentage 40.00% Ìý
Hibbing Taconite Company [Member] Ìý Ìý
Schedule of Equity Method Investments [Line Items] Ìý Ìý
Equity Method Investment, Ownership Percentage 23.00% Ìý
Spartan Steel Coating, LLC [Member] Ìý Ìý
Schedule of Equity Method Investments [Line Items] Ìý Ìý
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity Ìý $ 32.5
Equity Method Investment, Ownership Percentage 48.00% Ìý