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Noncontrolling interest in subsidiaries - Noncontrolling Interest in Net Assets of Subsidiaries (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Noncontrolling interest in net assets:
Noncontrolling interest in subsidiaries	$ 343.0	$ 325.7
Kronos Worldwide
Noncontrolling interest in net assets:
Noncontrolling interest in subsidiaries	210.3	209.0
NL Industries
Noncontrolling interest in net assets:
Noncontrolling interest in subsidiaries	81.5	76.9
CompX International
Noncontrolling interest in net assets:
Noncontrolling interest in subsidiaries	19.0	22.0
BMI
Noncontrolling interest in net assets:
Noncontrolling interest in subsidiaries	18.7	11.0
LandWell
Noncontrolling interest in net assets:
Noncontrolling interest in subsidiaries	$ 13.5	$ 6.8

X

- Definition

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

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