Quarterly report pursuant to Section 13 or 15(d)

DISCONTINUED OPERATIONS DISCONTINUED OPERATIONS (Narrative) (Details)

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DISCONTINUED OPERATIONS DISCONTINUED OPERATIONS (Narrative) (Details) - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 08, 2016
Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Deconsolidation, Gain (Loss), Amount   $ 528,200,000    
Loans to and accounts receivable from the Canadian Entities $ 69,900,000     $ 72,900,000
Guarantees 23,600,000     96,500,000
Sale amount for Pointe Noire port and rail assets     $ 66,750,000  
Sale Amount of the Bloom Lake Mine and Labrador Trough South mineral claims 10,500,000      
Canadian Entities [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Discontinued Operation, Tax Effect of Discontinued Operation 0      
Deconsolidation, Gain (Loss), Amount 3,800,000 (818,700,000)    
Cost Method Investments 0      
Wabush [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Debtor-in-Possession Financing, Amount Arranged 10,000,000      
Debtor-in-Possession Financing, Borrowings Outstanding 0      
North American Coal [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Discontinued Operation, Tax Effect of Discontinued Operation 100,000 (100,000)    
Bloom Lake Group [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Contingent Liabilities of Deconsolidated Entities 0 $ (342,700,000)    
Other Current Assets [Member] | Canadian Entities [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Debtor-in-Possession Financing, Borrowings Outstanding 1,500,000     6,800,000
Debtor-in-possession,Repayment 8,300,000      
Other Liabilities [Member] | Bloom Lake Group [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Contingent Liabilities recognized in Consolidated Financials $ 38,200,000     $ 35,900,000