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Investment in Kronos Worldwide, Inc. - Changes in Carrying Value of Investment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Balance at the beginning of the period |  |  | $ 250,278 |
Equity in earnings of Kronos | $ (2,811) | $ 5,973 | 2,714 | $ 8,449
Dividends received from Kronos |  |  | (3,522) | $ (13,384)
Equity in Kronos' other comprehensive income (loss): |  |  |  |
Balance at the end of the period | 259,405 |  | 259,405 |
Kronos |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Balance at the beginning of the period |  |  | 250,300 |
Equity in earnings of Kronos |  |  | 2,700 |
Dividends received from Kronos |  |  | (3,500) |
Equity in Kronos' other comprehensive income (loss): |  |  |  |
Currency translation |  |  | 9,600 |
Balance at the end of the period | $ 259,400 |  | 259,400 |
Kronos | Defined Benefit Pension Plans |  |  |  |
Equity in Kronos' other comprehensive income (loss): |  |  |  |
Defined benefit pension plans |  |  | $ 300 |

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