Inventory (Tables)

9 Months Ended

Sep. 30, 2013

Inventory Disclosure [Abstract]

Schedule of carrying value of product inventory

The carrying value of product inventory was as follows:

(in millions)	September 30, 2013		December 31, 2012
Finished product	$	42.2	$	53.5
Work-in-process	29.3		32.3
Stockpiled material	27.3		25.0
	$	98.8	$	110.8