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Quarterly report pursuant to Section 13 or 15(d)

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Investments In Unconsolidated Ventures) (Details)

v3.5.0.2
BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Investments In Unconsolidated Ventures) (Details) - Hibbing [Member] - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Other Noncurrent Liabilities [Member] Ìý Ìý
Schedule of Equity Method Investments [Line Items] Ìý Ìý
Equity Method Investments $ 3.7 $ (2.4)
Other Noncurrent Assets [Member] Ìý Ìý
Schedule of Equity Method Investments [Line Items] Ìý Ìý
Ownership interest, equity method investment 23.00% Ìý