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Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.3
BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
unit
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Schedule of Equity Method Investments [Line Items] Ìý Ìý Ìý Ìý
Number of Reporting Units | unit Ìý 2 Ìý Ìý
Gain on foreign currency translation $ 228.1 $ 0.0 $ 228.1 Ìý
Hibbing [Member] Ìý Ìý Ìý Ìý
Schedule of Equity Method Investments [Line Items] Ìý Ìý Ìý Ìý
Ownership interest, equity method investment Ìý 23.00% Ìý 23.00%
Hibbing [Member] | Other Noncurrent Liabilities [Member] Ìý Ìý Ìý Ìý
Schedule of Equity Method Investments [Line Items] Ìý Ìý Ìý Ìý
Equity Method Investments Ìý $ 14.0 Ìý $ 15.4