Quarterly report pursuant to Section 13 or 15(d)

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

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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