Inventory (Tables)

6 Months Ended

Jun. 30, 2013

Inventory Disclosure [Abstract]

Schedule of carrying value of product inventory

The carrying value of product inventory was as follows:

(in millions)	June 30, 2013		December 31, 2012
Finished product	$	36.1	$	53.5
Work-in-process	27.9		32.3
Stockpiled material	25.0		25.0
	$	89.0	$	110.8