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Noncontrolling interest in subsidiaries - Schedule of Noncontrolling Interest in Net Income of Subsidiaries (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income of subsidiaries | $ 15.0 | $ 45.9 | $ 70.5
Kronos Worldwide, Inc. |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income of subsidiaries | (9.5) | 20.0 | 22.0
NL |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income of subsidiaries | (0.4) | 5.8 | 8.7
CompX |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income of subsidiaries | 2.9 | 2.6 | 2.2
BMI |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income of subsidiaries | 8.2 | 2.8 | 14.7
LandWell |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income of subsidiaries | $ 13.8 | $ 14.7 | $ 22.9

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