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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

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