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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, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Noncontrolling interest in net income of subsidiaries: |  |  |  |
Noncontrolling interest in net income of subsidiaries | $ 8.9 | $ 4.9 | $ 18.6 | $ 18.4
Kronos Worldwide, Inc. |  |  |  |
Noncontrolling interest in net income of subsidiaries: |  |  |  |
Noncontrolling interest in net income of subsidiaries |  |  | 8.8 | 8.7
NL |  |  |  |
Noncontrolling interest in net income of subsidiaries: |  |  |  |
Noncontrolling interest in net income of subsidiaries |  |  | 4.4 | 1.1
CompX |  |  |  |
Noncontrolling interest in net income of subsidiaries: |  |  |  |
Noncontrolling interest in net income of subsidiaries |  |  | 1.2 | 0.9
BMI |  |  |  |
Noncontrolling interest in net income of subsidiaries: |  |  |  |
Noncontrolling interest in net income of subsidiaries |  |  | 1.6 | 3.0
LandWell |  |  |  |
Noncontrolling interest in net income of subsidiaries: |  |  |  |
Noncontrolling interest in net income of subsidiaries |  |  | $ 2.6 | $ 4.7

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