CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenues and other income:
Net sales	$ 559.7	$ 507.1	$ 1,090.3	$ 999.8
Other income, net	3.7	10.5	15.9	23.6
Total revenues and other income	563.4	517.6	1,106.2	1,023.4
Cost and expenses:
Cost of sales	438.4	441.6	882.7	880.2
Selling, general and administrative	74.9	68.4	143.5	137.2
Other components of net periodic pension and OPEB expense	0.6	7.5	1.2	8.7
Interest	11.9	7.2	23.2	14.2
Total costs and expenses	525.8	524.7	1,050.6	1,040.3
Income (loss) before income taxes	37.6	(7.1)	55.6	(16.9)
Income tax expense (benefit)	7.9	(6.8)	12.3	(12.0)
Net income (loss)	29.7	(0.3)	43.3	(4.9)
Noncontrolling interest in net income of subsidiaries	9.8	2.9	15.6	4.1
Net income (loss) attributable to Valhi stockholders	$ 19.9	$ (3.2)	$ 27.7	$ (9.0)
Amounts attributable to Valhi stockholders:
Basic net income (loss) per share (in dollars per share)	$ 0.70	$ (0.11)	$ 0.97	$ (0.31)
Diluted net income (loss) per share (in dollars per share)	$ 0.70	$ (0.11)	$ 0.97	$ (0.31)
Weighted average shares outstanding - basic (in shares)	28.5	28.5	28.5	28.5
Weighted average shares outstanding - diluted (in shares)	28.5	28.5	28.5	28.5