Inventories (Tables)

3 Months Ended

Mar. 31, 2012

Inventory Disclosure [Abstract]

Schedule of inventories by major class

The following schedule details inventories by major class ($ in millions):

	March 31, 2012		December 31, 2011
Raw materials	$	29.8	$	27.7
Work in process	32.9		29.4
Finished goods	38.2		36.0
Supplies and other	21.2		20.7
Total	$	122.1	$	113.8