CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Revenues and other income:
Net sales	$ 540.4	$ 559.7	$ 1,079.0	$ 1,090.3
Other income, net	31.1	3.7	31.9	15.9
Total revenues and other income	571.5	563.4	1,110.9	1,106.2
Cost and expenses:
Cost of sales	462.3	438.4	878.4	882.7
Selling, general and administrative	79.2	74.9	157.7	143.5
Other components of net periodic pension and OPEB expense	0.7	0.6	1.5	1.2
Interest	13.8	11.9	27.0	23.2
Total cost and expenses	556.0	525.8	1,064.6	1,050.6
Income before income taxes	15.5	37.6	46.3	55.6
Income tax expense	8.0	7.9	16.0	12.3
Net income	7.5	29.7	30.3	43.3
Noncontrolling interest in net income of subsidiaries	6.6	9.8	12.5	15.6
Net income attributable to Valhi stockholders	$ 0.9	$ 19.9	$ 17.8	$ 27.7
Amounts attributable to Valhi stockholders:
Basic net income per share (in dollars per share)	$ 0.03	$ 0.70	$ 0.62	$ 0.97
Diluted net income per share (in dollars per share)	$ 0.03	$ 0.70	$ 0.62	$ 0.97
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