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Fair value measurements and financial instruments- Financial Instruments not Carried at Fair Value (Detail) € in Thousands, $ in Millions | Jun. 30, 2024 EUR (€) | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($)
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Reported Value Measurement [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Cash, cash equivalents and restricted cash equivalents |  | $ 427.3 | $ 462.0
Estimate of Fair Value Measurement [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Cash, cash equivalents and restricted cash equivalents |  | 427.3 | 462.0
Kronos Worldwide, Inc. | 9.50% Senior Secured Notes due March 15, 2029 | Kronos International, Inc |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Long term debt, carrying amount | € 276,174 | 289.8 |
Long term debt, fair value |  | 321.1 |
Kronos Worldwide, Inc. | 3.75% Senior Secured Notes due September 15, 2025 | Kronos International, Inc |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Long term debt, carrying amount |  | 80.2 | 440.9
Long term debt, fair value |  | 79.3 | 424.5
LandWell | Bank note payable |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Long term debt, carrying amount |  | 11.9 | 12.2
Long term debt, fair value |  | $ 11.9 | $ 12.2

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