Annual report pursuant to Section 13 and 15(d)

DISCONTINUED OPERATIONS (Narrative) (Details)

v3.6.0.2
DISCONTINUED OPERATIONS (Narrative) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Discontinued Operation, Tax Effect of Discontinued Operation   $ 0 $ (6,000,000) $ (1,216,000,000)
Tangible Asset Impairment Charges   0 0 537,800,000
Deconsolidation, Gain (Loss), Amount     (528,200,000)  
LOSS FROM DISCONTINUED OPERATIONS, net of tax   (19,900,000) (892,100,000) (8,368,000,000)
Potential Earn Out from North American Coal sale   50,000,000    
Canadian Entities [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Disposal Group, Including Discontinued Operation, Revenue   0 11,300,000 563,500,000
Discontinued Operation, Tax Effect of Discontinued Operation   0 5,800,000 913,700,000
Deconsolidation, Gain (Loss), Amount   (17,500,000) (710,900,000) 0
Disposal Group, including discontinued operations, Impairment of long-lived assets   0 0 (7,536,800,000)
Cost Method Investments   0 0  
Disposal Group, Including Discontinued Operation, Costs of Goods Sold   0 (11,100,000) (808,400,000)
Eliminations with Continuing Operations   0 0 (53,600,000)
Disposal Group, Including Discontinued Operation, Gross Profit (Loss)   0 200,000 (298,500,000)
Disposal Group, Including Discontinued Operation, Operating Expense   0 (33,800,000) (306,300,000)
Disposal Group, Including Discontinued Operation, Other Expense   0 (1,000,000) (5,600,000)
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax   0 (34,600,000) (610,400,000)
LOSS FROM DISCONTINUED OPERATIONS, net of tax   (17,500,000) (739,700,000) (7,233,500,000)
North American Coal [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Amounts released from escrow   10,300,000    
Disposal Group, Including Discontinued Operation, Revenue   0 392,900,000 687,100,000
Discontinued Operations, Amounts Held in Escrow   0 14,900,000  
Discontinued Operation, Tax Effect of Discontinued Operation   0 200,000 302,200,000
Tangible Asset Impairment Charges $ 73,400,000      
Disposal Group, Including Discontinued Operation, Costs of Goods Sold   0 (449,200,000) (822,900,000)
Disposal Group, Including Discontinued Operation, Gross Profit (Loss)   0 (56,300,000) (135,800,000)
Disposal Group, Including Discontinued Operation, Operating Expense   (4,500,000) (30,400,000) (20,800,000)
Disposal Group, Including Discontinued Operation, Other Expense   0 (1,800,000) (3,000,000)
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax   (2,400,000) (79,200,000) (579,200,000)
LOSS FROM DISCONTINUED OPERATIONS, net of tax   (2,400,000) (152,400,000) $ (1,134,500,000)
Bloom Lake Group [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Deconsolidation, Gain (Loss), Amount $ 818,700,000      
Contingent Liabilities of Deconsolidated Entities   0 (203,100,000)  
Wabush Group [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Deconsolidation, Gain (Loss), Amount     134,700,000  
Other Current Assets [Member] | Canadian Entities [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Pre-Petition Financing   7,200,000    
DIP Financing   6,800,000    
Guarantees [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   200,000 96,500,000  
Other Current 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   37,000,000 35,900,000  
Fair Value, Inputs, Level 3 [Member] | Other Current Assets [Member] | Canadian Entities [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Loans, Associated Interest and Accounts Receivable recognized in Consolidated Financials at Fair Value   48,600,000 $ 72,900,000  
Maximum [Member] | Other Current Assets [Member] | Canadian Entities [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
DIP Financing   $ 10,000,000