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v3.25.2

Long-term debt - Kronos 3.75 Senior Secured Notes - Additional Information (Details) - Kronos Worldwide - 3.75% Senior Secured Notes due 2025 - Kronos International, Inc € in Millions, $ in Millions | Jun. 30, 2025 EUR (€) | Jun. 30, 2025 USD ($) | Dec. 31, 2024
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate | 3.75% | 3.75% | 3.75%
Debt instrument principal amount | € | € 75 |  |
Principal amount outstanding | $ |  | $ 87.9 |

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