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Noncontrolling interest in subsidiaries - Noncontrolling Interest in Net Assets of Subsidiaries (Detail) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
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Noncontrolling interest in net assets: |  |
Noncontrolling interest in subsidiaries | $ 324.4 | $ 325.7
Kronos Worldwide, Inc. |  |
Noncontrolling interest in net assets: |  |
Noncontrolling interest in subsidiaries | 202.4 | 209.0
NL Industries, Inc. |  |
Noncontrolling interest in net assets: |  |
Noncontrolling interest in subsidiaries | 77.5 | 76.9
CompX International Inc. |  |
Noncontrolling interest in net assets: |  |
Noncontrolling interest in subsidiaries | 22.1 | 22.0
BMI |  |
Noncontrolling interest in net assets: |  |
Noncontrolling interest in subsidiaries | 13.7 | 11.0
LandWell |  |
Noncontrolling interest in net assets: |  |
Noncontrolling interest in subsidiaries | $ 8.7 | $ 6.8

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