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Investment in Kronos Worldwide, Inc. - Selected Financial Information of Kronos Balance Sheet (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule Of Equity Method Investments [Line Items] |  |
Current assets | $ 174,300 | $ 237,958
Property and equipment, net | 23,982 | 24,026
Other noncurrent assets | 893 | 1,034
Total assets | 500,202 | 578,258
Current liabilities | 35,174 | 91,062
Accrued pension costs | 78 | 76
Other noncurrent liabilities | 1,279 | 6,183
Stockholders' equity | 375,377 | 396,904
Total liabilities and equity | 500,202 | 578,258
Kronos | Reportable Legal Entities |  |
Schedule Of Equity Method Investments [Line Items] |  |
Current assets | 1,070,400 | 1,105,300
Property and equipment, net | 725,700 | 694,100
Other noncurrent assets | 113,600 | 114,100
Total assets | 1,909,700 | 1,913,500
Current liabilities | 279,200 | 476,600
Long-term debt | 626,200 | 429,100
Accrued pension costs | 125,200 | 117,500
Other noncurrent liabilities | 74,400 | 73,300
Stockholders' equity | 804,700 | 817,000
Total liabilities and equity | $ 1,909,700 | $ 1,913,500

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