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

Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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The accumulated decrease in the carrying value of the mineral properties as a result of mine or mineral production.

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Carrying amount at the balance sheet date of mineral properties, gross of adjustments.

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Mineral properties, net of adjustments.

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