INVENTORIES (Inventories) (Details) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022
INVENTORIES [Abstract]
Finished products	[1]	$ 494.4	$ 439.3
Raw materials		51.2	63.4
Products in process		6.5	6.0
Operating supplies and other		63.5	70.6
Inventories		615.6	579.3
Encumbered inventories		$ 3.6	$ 3.6

[1] Includes inventories encumbered by volumetric production payments (see Note 2), as follows: December 31, 2023 — $3.6 million; December 31, 2022 — $3.6 million.