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Fair value measurements and financial instruments - Additional Information (Details) - Kronos Worldwide - Kronos International, Inc - EUR (€)	Sep. 30, 2025	Sep. 15, 2025	Dec. 31, 2024	Jul. 30, 2024	Feb. 12, 2024
9.50% Senior Secured Notes due 2029
Fair value measurements and financial instruments
Interest rate	9.50%	9.50%	9.50%	9.50%	9.50%
Estimated market price of the notes	€ 1,057
Principal amount of debt instrument	€ 1,000
3.75% Senior Secured Notes due 2025
Fair value measurements and financial instruments
Interest rate	3.75%	3.75%	3.75%

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

+ Details

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X

- 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

The nominal value (par value) or dollar value of a bond paid to the holder at maturity.

+ References

No definition available.

+ Details

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X

- Definition

Financial instrument at fair value.

+ References

No definition available.

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- Details

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