CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Revenues and other income:
Net sales	$ 2,077.0	$ 2,104.8	$ 1,921.7
Other income, net	59.1	61.8	55.4
Total revenues and other income	2,136.1	2,166.6	1,977.1
Cost and other expense (income):
Cost of sales	1,781.6	1,680.3	1,676.5
Selling, general and administrative	312.3	256.2	277.4
Gain on remeasurement of investment in TiO2 manufacturing joint venture		(64.5)
Gain on remeasurement of earn-out liability	(4.6)
Other components of net periodic pension and OPEB expense	32.7	2.6	11.8
Interest	57.1	49.9	28.3
Other		(2.1)	2.6
Total costs and other expense	2,179.1	1,922.4	1,996.6
Income (loss) before income taxes	(43.0)	244.2	(19.5)
Income tax expense (benefit)	11.9	82.9	(24.6)
Net income (loss)	(54.9)	161.3	5.1
Noncontrolling interest in net income of subsidiaries	2.7	53.3	15.0
Net income (loss) attributable to Valhi stockholders	$ (57.6)	$ 108.0	$ (9.9)
Amounts attributable to Valhi stockholders:
Basic net income (loss) per share (in dollars per share)	$ (2.02)	$ 3.79	$ (0.35)
Diluted net income (loss) per share (in dollars per share)	$ (2.02)	$ 3.79	$ (0.35)
Weighted average shares outstanding - basic (in shares)	28.5	28.5	28.5
Weighted average shares outstanding - diluted (in shares)	28.5	28.5	28.5