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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 |  |  |  |  |

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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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- 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 + Details
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