Valhi Stockholder's Equity (Tables)

12 Months Ended

Dec. 31, 2022

Equity [Abstract]

Schedule of Common Stock Outstanding

	Shares of common stock
	Issued	Treasury	Outstanding
	(In millions)
Balance at December 31, 2020, 2021 and 2022	29.6	(1.1)	28.5

Accumulated Other Comprehensive Loss (Loss)

Accumulated other comprehensive income (loss) attributable to Valhi stockholders comprises changes in equity as presented in the table below.

	Years ended December 31,
	2020		2021		2022
	(In millions)
Accumulated other comprehensive income (loss) (net of tax and   noncontrolling interest):
Marketable securities:
Balance at beginning of year	$	1.7	$	1.8	$	1.7
Other comprehensive income:
Unrealized gain (loss) arising during the year		.1		(.1)		(.1)
Balance at end of year	$	1.8	$	1.7	$	1.6
Currency translation:
Balance at beginning of year	$	(76.8)	$	(67.4)	$	(72.2)
Other comprehensive gain (loss) arising during the year		9.4		(4.8)		(19.3)
Balance at end of year	$	(67.4)	$	(72.2)	$	(91.5)
Defined benefit pension plans:
Balance at beginning of year	$	(146.6)	$	(154.1)	$	(120.9)
Other comprehensive income:
Amortization of prior service cost and net losses   included in net periodic pension cost		9.8		10.7		7.3
Net actuarial gain (loss) arising during the year		(17.3)		22.5		58.4
Plan settlement		—		—		.2
Balance at end of year	$	(154.1)	$	(120.9)	$	(55.0)
OPEB plans:
Balance at beginning of year	$	1.0	$	.3	$	.1
Other comprehensive income:
Amortization of prior service credit and net losses    included in net periodic OPEB cost		(.8)		(.3)		(.5)
Net actuarial gain arising during the year		.1		.1		1.4
Balance at end of year	$	.3	$	.1	$	1.0
Total accumulated other comprehensive loss:
Balance at beginning of year	$	(220.7)	$	(219.4)	$	(191.3)
Other comprehensive income		1.3		28.1		47.4
Balance at end of year	$	(219.4)	$	(191.3)	$	(143.9)