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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