Income taxes - Additional Information (Details) - Germany - Subsequent event	Jul. 18, 2025
Income taxes
Effective income tax rate, before change in enacted rate	15.00%
Effective income tax rate, reduction in enacted tax rate for each year, percentage	1.00%
Effective Income Tax Rate, After Change In Enacted Rate	10.00%

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) before change in the enacted rate.

No definition available.

Name:	vhi_EffectiveIncomeTaxRateBeforeChangeInEnactedRate
Namespace Prefix:	vhi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration