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Fair value measurements and financial instruments - Additional Information (Detail) - Kronos Worldwide, Inc. - EUR (€) | Sep. 30, 2024 | Jul. 30, 2024 | Feb. 12, 2024 | Dec. 31, 2023
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9.50% Senior Secured Notes due 2029 |  |  |  |
Financial Instrument At Fair Value [Line Items] |  |  |  |
Interest rate |  | 9.50% | 9.50% |
9.50% Senior Secured Notes due 2029 | Kronos International, Inc |  |  |  |
Financial Instrument At Fair Value [Line Items] |  |  |  |
Interest rate | 9.50% | 9.50% |  | 9.50%
Estimated market price of the notes | € 1,089 |  |  |
Principal amount of debt instrument | € 1,000 |  |  |
3.75% Senior Secured Notes due 2025 |  |  |  |
Financial Instrument At Fair Value [Line Items] |  |  |  |
Interest rate |  |  | 3.75% |
3.75% Senior Secured Notes due 2025 | Kronos International, Inc |  |  |  |
Financial Instrument At Fair Value [Line Items] |  |  |  |
Interest rate | 3.75% |  |  | 3.75%
Estimated market price of the notes | € 993 |  |  |
Principal amount of debt instrument | € 1,000 |  |  |

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- 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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