Inventories

3 Months Ended

Mar. 31, 2024

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 method.

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

	March 31,		December 31,
	2024		2023
Raw materials	$	322.4	$	326.2
Work in process		15.7		14.9
Finished goods		189.9		200.5
Supplies and materials		475.6		471.5
Inventories	$	1,003.6	$	1,013.1