Inventories

9 Months Ended

Sep. 30, 2020

Inventory Disclosure [Abstract]

Inventories

7. 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):

	September 30,		December 31,
	2020		2019
Raw materials	$	249.6	$	271.5
Work in process		14.0		11.0
Finished goods		191.0		207.7
Supplies and materials		323.0		303.9
Inventories	$	777.6	$	794.1