Inventories

3 Months Ended

Mar. 31, 2021

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 net realizable value. 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):

	March 31,		December 31,
	2021		2020
Raw materials	$	281.6	$	263.5
Work in process		11.6		11.6
Finished goods		174.1		183.6
Supplies and materials		332.3		329.2
Inventories	$	799.6	$	787.9