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)
CAD in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
CAD
Mar. 08, 2016
CAD
Dec. 31, 2015
USD ($)
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 $ 70,200,000   $ 70,200,000       $ 72,900,000
Guarantees 200,000   200,000       96,500,000
Sale amount for Pointe Noire port and rail assets | CAD           CAD 66,750  
Sale Amount of the Bloom Lake Mine and Labrador Trough South mineral claims | CAD         CAD 10,500    
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 $ 700,000 0 700,000      
Deconsolidation, Gain (Loss), Amount 300,000 134,700,000 4,100,000 (684,000,000)      
Cost Method Investments 0   0        
Contingent Liabilities of Deconsolidated Entities 0 139,100,000          
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   10,000,000        
Debtor-in-Possession Financing, Borrowings Outstanding 0   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) $ (400,000) 0 (500,000)      
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 $ (203,600,000)      
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   1,500,000       6,800,000
Debtor-in-possession,Repayment 8,300,000   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 $ 38,500,000   $ 38,500,000       $ 35,900,000