CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income (loss)	$ 85.6	$ (1.7)	$ 128.9	$ (6.6)
Other comprehensive income (loss), net of tax:
Currency translation	5.8	(1.4)	(10.9)	(12.4)
Defined benefit pension plans	0.7	0.7	2.1	7.0
Other	0.0	0.0	(0.2)	(0.4)
Total other comprehensive income (loss), net	6.5	(0.7)	(9.0)	(5.8)
Comprehensive income (loss)	92.1	(2.4)	119.9	(12.4)
Comprehensive income attributable to noncontrolling interest	29.9	4.0	41.5	6.3
Comprehensive income (loss) attributable to Valhi stockholders	$ 62.2	$ (6.4)	$ 78.4	$ (18.7)