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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, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Noncontrolling interest in net income of subsidiaries: |  |  |  |
Noncontrolling interest in net income of subsidiaries | $ 14.4 | $ 8.9 | $ 32.4 | $ 18.6
Kronos Worldwide, Inc. |  |  |  |
Noncontrolling interest in net income of subsidiaries: |  |  |  |
Noncontrolling interest in net income of subsidiaries |  |  | 19.8 | 8.8
NL |  |  |  |
Noncontrolling interest in net income of subsidiaries: |  |  |  |
Noncontrolling interest in net income of subsidiaries |  |  | 8.3 | 4.4
CompX |  |  |  |
Noncontrolling interest in net income of subsidiaries: |  |  |  |
Noncontrolling interest in net income of subsidiaries |  |  | 1.5 | 1.2
BMI |  |  |  |
Noncontrolling interest in net income of subsidiaries: |  |  |  |
Noncontrolling interest in net income of subsidiaries |  |  | (1.9) | 1.6
LandWell |  |  |  |
Noncontrolling interest in net income of subsidiaries: |  |  |  |
Noncontrolling interest in net income of subsidiaries |  |  | $ 4.7 | $ 2.6

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