PROPERTY, PLANT AND EQUIPMENT (Tables)

9 Months Ended

Sep. 30, 2017

Property, Plant and Equipment [Abstract]

Value Of Each Of The Major Classes Of Consolidated Depreciable Assets

The following table indicates the value of each of the major classes of our consolidated depreciable assets as of September 30, 2017 and December 31, 2016:

	(In Millions)
	September 30, 2017			December 31, 2016
Land rights and mineral rights	$	500.7		$	500.5
Office and information technology	66.2			65.1
Buildings	80.0			67.9
Mining equipment	585.4			592.2
Processing equipment	607.9			552.0
Electric power facilities	57.0			49.4
Land improvements	23.7			23.5
Asset retirement obligation	19.6			19.8
Other	30.4			28.1
Construction in-progress	35.4			42.8
	2,006.3			1,941.3
Allowance for depreciation and depletion	(1,012.5		)	(956.9		)
	$	993.8		$	984.4