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Noncontrolling Interest in Subsidiaries - Schedule of Noncontrolling Interest in Net Income of Subsidiaries (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Noncontrolling interest in net income of subsidiaries: |  |  |  |
Noncontrolling interest in net income of subsidiaries | $ 14.6 | $ 15.5 | $ 47.0 | $ 34.1
Kronos Worldwide, Inc. |  |  |  |
Noncontrolling interest in net income of subsidiaries: |  |  |  |
Noncontrolling interest in net income of subsidiaries |  |  | 23.9 | 15.8
NL |  |  |  |
Noncontrolling interest in net income of subsidiaries: |  |  |  |
Noncontrolling interest in net income of subsidiaries |  |  | 6.8 | 6.2
CompX |  |  |  |
Noncontrolling interest in net income of subsidiaries: |  |  |  |
Noncontrolling interest in net income of subsidiaries |  |  | 2.0 | 1.8
BMI |  |  |  |
Noncontrolling interest in net income of subsidiaries: |  |  |  |
Noncontrolling interest in net income of subsidiaries |  |  | 1.6 | 4.0
LandWell |  |  |  |
Noncontrolling interest in net income of subsidiaries: |  |  |  |
Noncontrolling interest in net income of subsidiaries |  |  | $ 12.7 | $ 6.3

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