Valhi Stockholder's Equity (Tables)

3 Months Ended

Mar. 31, 2023

Equity [Abstract]

Accumulated Other Comprehensive Loss (Loss)

	Three months ended
	March 31,
	2022		2023
	(In millions)
Accumulated other comprehensive income (loss) (net of tax and   noncontrolling interest):
Marketable securities:
Balance at beginning of period	$	1.7	$	1.6
Other comprehensive income:
Unrealized gain arising during the period		—		—
Balance at end of period	$	1.7	$	1.6
Currency translation:
Balance at beginning of period	$	(72.2)	$	(91.5)
Other comprehensive gain (loss) arising during the period		4.2		(4.5)
Balance at end of period	$	(68.0)	$	(96.0)
Defined benefit pension plans:
Balance at beginning of period	$	(120.9)	$	(55.0)
Other comprehensive income:
Amortization of prior service cost and net losses   included in net periodic pension cost		1.8		.6
Balance at end of period	$	(119.1)	$	(54.4)
OPEB plans:
Balance at beginning of period	$	.1	$	1.0
Other comprehensive income:
Amortization of prior service credit and net losses    included in net periodic OPEB cost		(.1)		(.2)
Balance at end of period	$	—	$	.8
Total accumulated other comprehensive loss:
Balance at beginning of period	$	(191.3)	$	(143.9)
Other comprehensive income (loss)		5.9		(4.1)
Balance at end of period	$	(185.4)	$	(148.0)