This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

Amount of income (loss) for proportionate share of equity method investee's income (loss).

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Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Schedule Of Equity Method Investments [Line Items]
Balance at the beginning of the period			$ 230,088
Equity in earnings of Kronos	$ 4,644	$ (2,811)	3,167	$ 2,714
Dividends received from Kronos			(3,522)	$ (3,522)
Equity in Kronos' other comprehensive income (loss):
Balance at the end of the period	230,017		230,017
Kronos
Schedule Of Equity Method Investments [Line Items]
Balance at the beginning of the period			230,100
Equity in earnings of Kronos			3,200
Dividends received from Kronos			(3,500)
Equity in Kronos' other comprehensive income (loss):
Balance at the end of the period	$ 230,000		230,000
Kronos \| Defined benefit pension plans
Equity in Kronos' other comprehensive income (loss):
Defined benefit pension plans			$ 200