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Noncontrolling interest in subsidiaries - Schedule of Noncontrolling Interest in Net Income of Subsidiaries (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income of subsidiaries | $ 53.3 | $ 15.0 | $ 45.9
Kronos Worldwide |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income of subsidiaries | 16.1 | (9.5) | 20.0
NL Industries |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income of subsidiaries | 11.4 | (0.4) | 5.8
CompX International |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income of subsidiaries | 2.0 | 2.9 | 2.6
BMI |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income of subsidiaries | 9.6 | 8.2 | 2.8
LandWell |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income of subsidiaries | $ 14.2 | $ 13.8 | $ 14.7

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