Marketable securities (Tables)

12 Months Ended

Dec. 31, 2023

Marketable securities

Classification of Marketable securities

	Fair value
	measurement	Market		Cost		Unrealized
Marketable security	level	value		basis		loss
		(In millions)
December 31, 2022:
Valhi common stock	1	$	3.2	$	3.2	$	-
December 31, 2023:
Valhi common stock	1	$	2.2	$	3.2	$	(1.0)