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)

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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
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