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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Noncontrolling interest in net income of subsidiaries: |  |  |  |
Noncontrolling interest in net income of subsidiaries | $ 4.9 | $ 11.1 | $ 18.4 | $ 21.3
Kronos Worldwide, Inc. |  |  |  |
Noncontrolling interest in net income of subsidiaries: |  |  |  |
Noncontrolling interest in net income of subsidiaries |  |  | 8.7 | 11.6
NL Industries |  |  |  |
Noncontrolling interest in net income of subsidiaries: |  |  |  |
Noncontrolling interest in net income of subsidiaries |  |  | 1.1 | 3.6
CompX International |  |  |  |
Noncontrolling interest in net income of subsidiaries: |  |  |  |
Noncontrolling interest in net income of subsidiaries |  |  | 0.9 | 1.2
BMI |  |  |  |
Noncontrolling interest in net income of subsidiaries: |  |  |  |
Noncontrolling interest in net income of subsidiaries |  |  | 3.0 | 2.0
LandWell |  |  |  |
Noncontrolling interest in net income of subsidiaries: |  |  |  |
Noncontrolling interest in net income of subsidiaries |  |  | $ 4.7 | $ 2.9

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