Annual report pursuant to Section 13 and 15(d)

PROPERTY, PLANT AND EQUIPMENT PROPERTY, PLANT AND EQUIPMENT (Book Value of Land and Mineral Rights Disclosure) (Details)

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PROPERTY, PLANT AND EQUIPMENT PROPERTY, PLANT AND EQUIPMENT (Book Value of Land and Mineral Rights Disclosure) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Abstract]    
Land Rights $ 46.3 $ 46.4
Mineral Rights [Abstract]    
Mineral Properties, Gross 7,773.3 7,874.4
Mineral Properties, Accumulated Depletion 942.6 727.0
Mineral Properties, Net $ 6,830.7 $ 7,147.4