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Quarterly report pursuant to Section 13 or 15(d)

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)

v3.19.2
BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)
$ in Millions
6 Months Ended
Jun. 30, 2019
USD ($)
unit
Dec. 31, 2018
USD ($)
Related Party Transaction [Line Items] Ìý Ìý
Number of Reporting Units | unit 2 Ìý
Hibbing [Member] Ìý Ìý
Related Party Transaction [Line Items] Ìý Ìý
Ownership interest, equity method investment 23.00% 23.00%
Hibbing [Member] | Other Noncurrent Liabilities [Member] Ìý Ìý
Related Party Transaction [Line Items] Ìý Ìý
Equity Method Investments | $ $ 12.9 $ 15.4