CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net income	$ 149.0	$ 63.9	$ 277.2	$ 140.8
Other comprehensive income (loss), net of tax:
Currency translation	4.2	26.1	(8.9)	46.2
Marketable securities		(1.1)	(0.1)	(1.9)
Interest rate swap		1.6		1.7
Total other comprehensive income (loss), net	6.5	28.7	(2.1)	51.3
Comprehensive income	155.5	92.6	275.1	192.1
Comprehensive income attributable to noncontrolling interest	7.3	24.7	32.2	85.7
Comprehensive income attributable to Valhi stockholders	148.2	67.9	242.9	106.4
Defined Benefit Pension Plans
Other comprehensive income (loss), net of tax:
Pension and other postretirement benefit plan	2.5	2.4	7.6	6.0
OPEB
Other comprehensive income (loss), net of tax:
Pension and other postretirement benefit plan	$ (0.2)	$ (0.3)	$ (0.7)	$ (0.7)