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Quarterly report pursuant to Section 13 or 15(d)

PROPERTY, PLANT AND EQUIPMENT (Value Of Each Of The Major Classes Of Consolidated Depreciable Assets) (Details)

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PROPERTY, PLANT AND EQUIPMENT (Value Of Each Of The Major Classes Of Consolidated Depreciable Assets) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items] Ìý Ìý
Property, plant and equipment, gross $ 4,174.5 $ 13,570.9
Accumulated Depreciation and Depletion, Property, Plant and Equipment (966.6) (2,417.5)
Property, plant and equipment, net 3,207.9 11,153.4
Land Rights And Mineral Rights [Member]
 Ìý Ìý
Property, Plant and Equipment [Line Items] Ìý Ìý
Property, plant and equipment, gross 1,947.6 7,819.6
Office And Information Technology [Member]
 Ìý Ìý
Property, Plant and Equipment [Line Items] Ìý Ìý
Property, plant and equipment, gross 80.7 125.7
Buildings [Member]
 Ìý Ìý
Property, Plant and Equipment [Line Items] Ìý Ìý
Property, plant and equipment, gross 88.9 255.2
Mining Equipment [Member]
 Ìý Ìý
Property, Plant and Equipment [Line Items] Ìý Ìý
Property, plant and equipment, gross 1,399.5 1,819.3
Processing Equipment [Member]
 Ìý Ìý
Property, Plant and Equipment [Line Items] Ìý Ìý
Property, plant and equipment, gross 361.9 2,148.6
Electric Power Facilities [Member]
 Ìý Ìý
Property, Plant and Equipment [Line Items] Ìý Ìý
Property, plant and equipment, gross 57.4 114.3
Port Facilities [Member]
 Ìý Ìý
Property, Plant and Equipment [Line Items] Ìý Ìý
Property, plant and equipment, gross 27.6 99.4
Interest Capitalized During Construction [Member]
 Ìý Ìý
Property, Plant and Equipment [Line Items] Ìý Ìý
Property, plant and equipment, gross 18.8 23.8
Land Improvements [Member]
 Ìý Ìý
Property, Plant and Equipment [Line Items] Ìý Ìý
Property, plant and equipment, gross 32.5 69.3
Other [Member]
 Ìý Ìý
Property, Plant and Equipment [Line Items] Ìý Ìý
Property, plant and equipment, gross 65.5 104.4
Construction in Progress [Member]
 Ìý Ìý
Property, Plant and Equipment [Line Items] Ìý Ìý
Property, plant and equipment, gross $ 94.1 $ 991.3