CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net income	$ 107.8	$ 21.8
Other comprehensive income (loss), net of tax:
Currency translation	9.8	7.5
Marketable securities	(0.1)	(0.3)
Interest rate swap		0.5
Total other comprehensive income, net	12.0	10.3
Comprehensive income	119.8	32.1
Comprehensive income attributable to noncontrolling interest	21.7	11.8
Comprehensive income attributable to Valhi stockholders	98.1	20.3
Defined Benefit Pension Plans
Other comprehensive income (loss), net of tax:
Pension and other postretirement benefit plan	2.6	2.8
OPEB
Other comprehensive income (loss), net of tax:
Pension and other postretirement benefit plan	$ (0.3)	$ (0.2)