Annual report pursuant to Section 13 and 15(d)

DISCONTINUED OPERATIONS Schedule of Disposal Groups, including Discontinued Operations, Assets and Liabilities - North American Coal (Details)

v3.6.0.2
DISCONTINUED OPERATIONS Schedule of Disposal Groups, including Discontinued Operations, Assets and Liabilities - North American Coal (Details)
CAD in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Jun. 30, 2016
CAD
Mar. 31, 2016
CAD
Schedule of Disposal Groups, Including Discontinued Operations, Assets and Liabilities [Line Items]          
Discontinued Operation, Tax Effect of Discontinued Operation $ 0 $ (6,000,000) $ (1,216,000,000)    
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  
North American Coal [Member]          
Schedule of Disposal Groups, Including Discontinued Operations, Assets and Liabilities [Line Items]          
Loss Contingency Accrual 2,100,000 7,800,000      
Disposal Group, Including Discontinued Operation, Other Assets, Current 0 14,900,000      
Disposal Group, Including Discontinued Operation, Assets 0 14,900,000      
Disposal Group, Including Discontinued Operation, Accrued Liabilities 1,100,000 0      
Disposal Group, Including Discontinued Operation, Other Liabilities, Current 4,900,000 6,900,000      
Disposal Group, Including Discontinued Operation, Liabilities 6,000,000 6,900,000      
Discontinued Operation, Tax Effect of Discontinued Operation 0 200,000 302,200,000    
Canadian Entities [Member]          
Schedule of Disposal Groups, Including Discontinued Operations, Assets and Liabilities [Line Items]          
Cost Method Investments 0 0      
Discontinued Operation, Tax Effect of Discontinued Operation $ 0 $ 5,800,000 $ 913,700,000