BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Investments In Unconsolidated Ventures) (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Investment	$ 3.2	$ 4.1
Other Noncurrent Liabilities [Member] | Hibbing [Member]
Schedule of Equity Method Investments [Line Items]
Investment		3.1
Other Noncurrent Assets [Member] | Hibbing [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest, equity method investment	23.00%
Investment	$ 2.1
Other Noncurrent Assets [Member] | Other Equity Investees [Member]
Schedule of Equity Method Investments [Line Items]
Investment	$ 1.1	$ 1.0