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Noncontrolling interest in subsidiaries - Noncontrolling Interest in Net Assets of Subsidiaries (Detail) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
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Noncontrolling interest in net assets: |  |
Noncontrolling interest in subsidiaries | $ 344.1 | $ 325.7
Kronos Worldwide, Inc. |  |
Noncontrolling interest in net assets: |  |
Noncontrolling interest in subsidiaries | 216.2 | 209.0
NL Industries, Inc. |  |
Noncontrolling interest in net assets: |  |
Noncontrolling interest in subsidiaries | 79.7 | 76.9
CompX International Inc. |  |
Noncontrolling interest in net assets: |  |
Noncontrolling interest in subsidiaries | 18.9 | 22.0
Basic Management Inc |  |
Noncontrolling interest in net assets: |  |
Noncontrolling interest in subsidiaries | 16.7 | 11.0
LandWell |  |
Noncontrolling interest in net assets: |  |
Noncontrolling interest in subsidiaries | $ 12.6 | $ 6.8

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