Property, Plant, Equipment and Development (Tables)

9 Months Ended

Sep. 30, 2013

Property, Plant and Equipment [Abstract]

Schedule of property, plant, equipment and development

Property, plant, equipment and development, net was comprised of the following:

(in millions)	September 30, 2013			December 31, 2012
Mining properties and mineral reserves	$	893.3		$	978.0
Mining and milling equipment and facilities	1,883.7			467.5
Processing facilities	166.4			165.8
Construction-in-progress	87.1			1,089.0
Other	18.6			18.2
	3,049.1			2,718.5
Less: Accumulated depreciation, depletion and amortization	(224.7		)	(179.6		)
	$	2,824.4		$	2,538.9