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Investment in Kronos Worldwide, Inc. - Selected Financial Information of Kronos Balance Sheet (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Schedule Of Equity Method Investments [Line Items]    
Current assets $ 163,625 $ 159,903
Property and equipment, net 23,481 23,709
Other noncurrent assets 928 931
Total assets 470,571 464,220
Current liabilities 18,132 20,580
Other noncurrent liabilities 1,168 1,277
Stockholders' equity 363,033 358,769
Total liabilities and equity 470,571 464,220
Kronos | Reportable Legal Entities    
Schedule Of Equity Method Investments [Line Items]    
Current assets 942,600 994,500
Property and equipment, net 707,600 724,300
Other noncurrent assets 93,800 98,000
Total assets 1,744,000 1,816,800
Current liabilities 285,800 368,800
Long-term debt 569,600 557,400
Accrued pension costs 73,700 80,900
Other noncurrent liabilities 63,900 58,600
Stockholders' equity 751,000 751,100
Total liabilities and equity $ 1,744,000 $ 1,816,800