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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