Property, Plant, Equipment and Development (Tables)

3 Months Ended

Mar. 31, 2013

Property, Plant and Equipment [Abstract]

Schedule of property, plant, equipment and development

Property, plant, equipment and development is comprised of the following:

(in millions)	March 31, 2013			December 31, 2012
Mining properties and mineral reserves	$	982.8		$	978.0
Mining and milling equipment and facilities	493.7			467.5
Processing facilities	165.9			165.8
Construction-in-progress	1,156.7			1,089.0
Other	18.7			18.2
	2,817.8			2,718.5
Less: Accumulated depreciation, depletion and amortization	(195.2		)	(179.6		)
	$	2,622.6		$	2,538.9