Inventories

Inventories consisted of the following components as of September 30, 2017 and June 30, 2017:



($ in millions)	September 30, 2017		June 30, 2017
Raw materials and supplies	$	172.0	$	152.8
Work in process	383.1		365.6
Finished and purchased products	182.2		172.0
Total inventory	$	737.3	$	690.4

Inventories are valued at the lower of cost or market. Cost for inventories is principally determined using the last-in, first-out (“LIFO”) inventory costing method. The Company also uses the first-in, first-out (“FIFO”) and average cost methods. As of September 30, 2017 and June 30, 2017, $117.4 million and $107.3 million of inventory, respectively, was accounted for using a method other than the LIFO inventory costing method.