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Investment in Kronos Worldwide, Inc. - Selected Financial Information of Kronos Income Statement (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Net sales | $ 39,950 | $ 33,667 | $ 120,588 | $ 107,525
Cost of sales | 28,921 | 24,199 | 84,506 | 77,225
Income from operations | 1,851 | 2,036 | 7,800 | 4,183
Income tax expense | (854) | 8,508 | (920) | 10,798
Net income | (7,871) | 36,010 | (6,849) | 50,684
Kronos | Reportable Legal Entities |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Net sales | 456,900 | 484,700 | 1,441,100 | 1,464,000
Cost of sales | 409,900 | 383,500 | 1,224,500 | 1,191,100
Income from operations | (19,200) | 38,900 | 26,600 | 94,300
Income tax expense | 7,900 | 22,700 | 19,000 | 34,700
Net income | $ (37,000) | $ 71,800 | $ (28,100) | $ 99,400

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