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DISCONTINUED OPERATIONS Schedule of Disposal Groups, including Discontinued Operations, Assets and Liabilities - North American Coal (Details) - North American Coal [Member] - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
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Schedule of Disposal Groups, Including Discontinued Operations, Assets and Liabilities [Line Items] |  |
Loss Contingency Accrual | $ 7.8 |
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net | 0.0 | $ 44.8
Disposal Group, Including Discontinued Operation, Inventory | 0.0 | 50.3
Disposal group, including Discontinued Operations, Prepaid Supplies | 0.0 | 28.2
Disposal Group, Including Discontinued Operation, Other Assets, Current | 14.9 | 16.8
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment | 0.0 | 94.7
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent | 0.0 | 18.6
Disposal Group, Including Discontinued Operation, Assets | 14.9 | 253.4
Disposal Group, Including Discontinued Operation, Accounts Payable | 0.0 | 22.4
Disposal Group, Including Discontinued Operation, Accrued Liabilities | 0.0 | 27.9
Disposal Group, Including Discontinued Operation, Other Liabilities, Current | 6.9 | 29.8
Disposal group, Including Discontinued Operation, Pension and Other Postretirement Obligations | 0.0 | 47.1
Disposal Group Including Discontinued Operations Environmental Loss Contingency And Mine Reclamation And Closing Liability CurrentAnd Noncurrent | 0.0 | 33.9
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent | 0.0 | 36.3
Disposal Group, Including Discontinued Operation, Liabilities | $ 6.9 | $ 197.4

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