Inventory (Tables)

3 Months Ended

Mar. 31, 2013

Inventory Disclosure [Abstract]

Schedule of carrying value of product inventory

The carrying value of product inventory is as follows:

(in millions)	March 31, 2013		December 31, 2012
Finished product	$	52.0	$	53.5
Work-in-process	26.9		32.3
Stockpiled material	26.8		25.0
	$	105.7	$	110.8