Inventories

Inventories consisted of the following components as of March 31, 2018 and June 30, 2017:



($ in millions)	March 31, 2018		June 30, 2017
Raw materials and supplies	$	168.7	$	152.8
Work in process	379.4		365.6
Finished and purchased products	184.5		172.0
Total inventory	$	732.6	$	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 March 31, 2018 and June 30, 2017, $136.3 million and $107.3 million of inventory, respectively, was accounted for using a method other than the LIFO inventory costing method.