Inventories

6 Months Ended

Jun. 30, 2019

Inventory Disclosure [Abstract]

Inventories

9. Inventories

We value our raw materials, work in process, and finished goods inventories using lower of cost, as determined by the average cost method, or market. Supplies and materials are valued at the first-in, first-out (FIFO) or average cost methods.

The components of inventories were as follows (dollars in millions):

	June 30,		December 31,
	2019		2018
Raw materials	$	303.5	$	307.8
Work in process		14.3		13.9
Finished goods		213.9		199.0
Supplies and materials		284.0		274.9
Inventories	$	815.7	$	795.6