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Annual report pursuant to Section 13 and 15(d)

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

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PROPERTY, PLANT AND EQUIPMENT (Book Value of Land and Mineral Rights Disclosure) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Abstract] Ìý Ìý
Land Rights $ 12.4 $ 11.6
Mineral Rights [Abstract] Ìý Ìý
Mineral Properties, Gross 537.2 488.9
Mineral Properties, Accumulated Depletion (119.1) (112.2)
Mineral Properties, Net $ 418.1 $ 376.7