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Financial instruments - Additional Information (Details) $ in Millions			12 Months Ended
	Feb. 12, 2024 USD ($)	Feb. 12, 2024 EUR (€)	Dec. 31, 2024 USD ($)	Dec. 31, 2024 EUR (€)	Aug. 31, 2024	Jul. 31, 2024	Jul. 30, 2024	Dec. 31, 2023 USD ($)
Financial instruments
Subordinated, Unsecured Term Loan from Contran			$ 53.7
Valhi - Contran credit facility			$ 563.4					$ 546.5
Kronos Worldwide | 9.50% Senior Secured Notes due 2029
Financial instruments
Interest rate	9.50%	9.50%					9.50%
Kronos Worldwide | 9.50% Senior Secured Notes due 2029 | Kronos International, Inc
Financial instruments
Interest rate	9.50%	9.50%	9.50%	9.50%				9.50%
Estimated market price of the notes | €				€ 1,101
Principal amount of debt instrument | €				€ 1,000
Valhi - Contran credit facility			$ 365.4
Kronos Worldwide | 3.75% Senior Secured Notes due 2025
Financial instruments
Interest rate	3.75%	3.75%
Kronos Worldwide | 3.75% Senior Secured Notes due 2025 | Kronos International, Inc
Financial instruments
Interest rate			3.75%	3.75%				3.75%
Estimated market price of the notes | €				€ 996
Principal amount of debt instrument | €				€ 1,000
Valhi - Contran credit facility			$ 78.3					$ 440.9
Kronos Worldwide | Subordinated, unsecured term loan from Contran
Financial instruments
Interest rate					9.54%	11.50%
Subordinated, Unsecured Term Loan from Contran	$ 53.7	€ 50,000,000	53.7
VALHI, INC. | Contran Credit Facility
Financial instruments
Valhi - Contran credit facility			$ 44.6

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(a)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B

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X

- Definition

Amount of long-term debt and lease obligation, including portion classified as current.

+ References

No definition available.

+ Details

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X

- Definition

The cash inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-14

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- Definition

The market price or dollar value of a bond traded in open markets, reflecting any premium or discount to par value.

+ References

No definition available.

+ Details

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- Definition

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+ References

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- Definition

Financial instrument at fair value.

+ References

No definition available.

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