Annual report pursuant to Section 13 and 15(d)

PROPERTY, PLANT AND EQUIPMENT (Narrative) (Details)

v3.3.1.900
PROPERTY, PLANT AND EQUIPMENT (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]      
Depletion $ 7.4 $ 79.6 $ 84.9
Depreciation $ 119.2 173.0 $ 191.5
Tangible Asset Impairment Charges   537.8  
Land Rights And Mineral Rights [Member]      
Property, Plant and Equipment [Line Items]      
Tangible Asset Impairment Charges   $ 297.2