Quarterly report pursuant to Section 13 or 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
Sep. 30, 2015
Dec. 31, 2014
Schedule of Disposal Groups, Including Discontinued Operations, Assets and Liabilities [Line Items]    
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net $ 35.8 $ 44.8
Disposal Group, Including Discontinued Operation, Inventory 21.4 50.3
Disposal group, including Discontinued Operations, Prepaid Supplies 28.0 28.2
Disposal Group, Including Discontinued Operation, Other Assets, Current 24.1 20.5
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment 31.3 94.7
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent 0.8 35.7
Disposal Group, Including Discontinued Operation, Assets 141.4 274.2
Disposal Group, Including Discontinued Operation, Accounts Payable 18.6 22.4
Disposal Group, Including Discontinued Operation, Accrued Liabilities 16.6 27.9
Disposal Group, Including Discontinued Operation, Other Liabilities, Current 19.7 31.0
Disposal group, Including Discontinued Operation, Pension and Other Postretirement Obligations 59.5 55.8
Disposal Group Including Discontinued Operations Environmental Loss Contingency And Mine Reclamation And Closing Liability CurrentAnd Noncurrent 35.4 33.9
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent 32.4 36.2
Disposal Group, Including Discontinued Operation, Liabilities $ 182.2 $ 207.2