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Business segment information - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Business segment information |  |  |
Number of reportable segment not disclosed |  | true |
Chemicals |  |  |
Business segment information |  |  |
Accelerated depreciation | $ 4.0 |  | $ 14.0
Charge related to workforce reductions |  |  | 2.0
Chemicals | Louisiana Pigment Company, L.P. (LPC) |  |  |
Business segment information |  |  |
Transaction costs |  |  | $ 2.2
Kronos | Valhi Incorporation |  |  |
Business segment information |  |  |
Direct ownership percentage by parent |  | 50.00% |
Kronos | NL Industries |  |  |
Business segment information |  |  |
Indirect controlling interest in subsidiary |  | 31.00% |
NL Industries | Valhi Incorporation |  |  |
Business segment information |  |  |
Direct ownership percentage by parent |  | 83.00% |
LandWell | Valhi Incorporation |  |  |
Business segment information |  |  |
Direct ownership percentage by parent |  | 27.00% |
LandWell | Basic Management Inc |  |  |
Business segment information |  |  |
Indirect controlling interest in subsidiary |  | 50.00% |
Basic Management Inc | Valhi Incorporation |  |  |
Business segment information |  |  |
Direct ownership percentage by parent |  | 63.00% |

X
- Definition Amount of expense for acquisition-related cost incurred to effect business combination. Includes, but is not limited to, finder's fee; advisory, legal, accounting, valuation, and other professional and consulting fees; and general administrative cost, including cost of maintaining internal acquisition department. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479328/805-10-50-7 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 10 -Name Accounting Standards Codification -Section 25 -Paragraph 23 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479405/805-10-25-23 + Details
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- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
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- Definition Amount of accelerated depreciation charged against earnings associated with exit from or disposal of business activities or restructuring plan. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 + Details
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- Details
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