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Noncontrolling interest in subsidiaries - Noncontrolling Interest in Net Assets of Subsidiaries (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Noncontrolling interest in net assets:
Noncontrolling interest in subsidiaries	$ 353.4	$ 343.0
Kronos Worldwide
Noncontrolling interest in net assets:
Noncontrolling interest in subsidiaries	207.9	210.3
NL Industries
Noncontrolling interest in net assets:
Noncontrolling interest in subsidiaries	77.9	81.5
CompX International
Noncontrolling interest in net assets:
Noncontrolling interest in subsidiaries	17.9	19.0
BMI
Noncontrolling interest in net assets:
Noncontrolling interest in subsidiaries	25.1	18.7
LandWell
Noncontrolling interest in net assets:
Noncontrolling interest in subsidiaries	$ 24.6	$ 13.5

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- Definition

Amount of equity (deficit) attributable to noncontrolling interest. Excludes temporary equity.

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