XML 55 R45.htm IDEA: XBRL DOCUMENT
v3.25.2

Organization and basis of presentation - Additional Information (Details) | Jun. 30, 2025 | Jul. 16, 2024 | Jul. 15, 2024
--- | --- | --- | ---
Kronos | Louisiana Pigment Company, L.P. (LPC) |  |  |
Organization and basis of presentation |  |  |
Percentage held through wholly-owned subsidiary |  | 50.00% |
Percentage acquired |  | 50.00% | 50.00%
Contran | Valhi Incorporation |  |  |
Organization and basis of presentation |  |  |
Parent company ownership interest | 91.00% |  |

X
- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479328/805-10-50-2 + Details
Name: | us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of equity in the acquiree held by the acquirer immediately before the acquisition date in a business combination. + References No definition available. + Details
Name: | us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
Name: | us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Basis of presentation and significant accounting policies. + References No definition available. + Details
Name: | vhi_BasisOfPresentationAndSignificantAccountingPoliciesLineItems
Namespace Prefix: | vhi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=vhi_KronosMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=vhi_LouisianaPigmentCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=vhi_ContranMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_OwnershipAxis=vhi_ValhiIncorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |