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Noncontrolling interest in subsidiaries - Schedule of Noncontrolling Interest in Net Income of Subsidiaries (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |  |
Noncontrolling interest in net income of subsidiaries | $ 9.8 | $ 2.9 | $ 15.6 | $ 4.1
Kronos Worldwide, Inc. |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |  |
Noncontrolling interest in net income of subsidiaries |  |  | 5.1 | (4.5)
NL |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |  |
Noncontrolling interest in net income of subsidiaries |  |  | 2.5 | (1.7)
CompX |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |  |
Noncontrolling interest in net income of subsidiaries |  |  | 1.1 | 1.3
BMI |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |  |
Noncontrolling interest in net income of subsidiaries |  |  | 2.7 | 3.5
LandWell |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |  |
Noncontrolling interest in net income of subsidiaries |  |  | $ 4.2 | $ 5.5

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