Annual report pursuant to Section 13 and 15(d)

DISCONTINUED OPERATIONS (Narrative) (Details)

v3.3.1.900
DISCONTINUED OPERATIONS (Narrative) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Discontinued Operation, Tax Effect of Discontinued Operation   $ (6,000,000) $ (1,216,000,000) $ (184,500,000)
Tangible Asset Impairment Charges     537,800,000  
Deconsolidation, Gain (Loss), Amount   (528,200,000)    
LOSS FROM DISCONTINUED OPERATIONS, net of tax   (892,100,000) (8,368,000,000) (517,100,000)
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   11,300,000 563,500,000 978,700,000
Discontinued Operation, Tax Effect of Discontinued Operation   5,800,000 913,700,000 188,700,000
Deconsolidation, Gain (Loss), Amount   (710,900,000) 0 0
Disposal Group, including discontinued operations, Impairment of long-lived assets   0 (7,536,800,000) (236,400,000)
Cost Method Investments   0    
Disposal Group, Including Discontinued Operation, Costs of Goods Sold   (11,100,000) (808,400,000) (1,082,000,000)
Eliminations with Continuing Operations   0 (53,600,000) (217,300,000)
Disposal Group, Including Discontinued Operation, Gross Profit (Loss)   200,000 (298,500,000) (320,600,000)
Disposal Group, Including Discontinued Operation, Operating Expense   (33,800,000) (306,300,000) (151,500,000)
Disposal Group, Including Discontinued Operation, Other Expense   (1,000,000) (5,600,000) (10,000,000)
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax   (34,600,000) (610,400,000) (462,100,000)
LOSS FROM DISCONTINUED OPERATIONS, net of tax   (739,700,000) (7,233,500,000) (509,800,000)
North American Coal [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Disposal Group, Including Discontinued Operation, Revenue   392,900,000 687,100,000 821,900,000
Discontinued Operations, Amounts Held in Escrow   14,900,000 17,500,000  
Discontinued Operation, Tax Effect of Discontinued Operation   200,000 302,200,000 (6,200,000)
Tangible Asset Impairment Charges $ 73,400,000      
Disposal Group, Including Discontinued Operation, Costs of Goods Sold   (449,200,000) (822,900,000) (836,400,000)
Disposal Group, Including Discontinued Operation, Gross Profit (Loss)   (56,300,000) (135,800,000) (14,500,000)
Disposal Group, Including Discontinued Operation, Operating Expense   (30,400,000) (20,800,000) (13,800,000)
Disposal Group, Including Discontinued Operation, Other Expense   (1,800,000) (3,000,000) (2,400,000)
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax   (79,200,000) (579,200,000) (3,100,000)
LOSS FROM DISCONTINUED OPERATIONS, net of tax   (152,400,000) (1,134,500,000) $ (9,300,000)
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   (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    
Asia Pacific Iron Ore [Member] | Asia Pacific Iron Ore [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Tangible Asset Impairment Charges     $ 526,500,000  
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   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   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   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