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Noncontrolling Interest in Subsidiaries - Schedule of Noncontrolling Interest in Net Income (loss) of Subsidiaries (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income (loss) of subsidiaries | $ 33.8 | $ 29.0 | $ 38.8
Kronos Worldwide, Inc. |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income (loss) of subsidiaries | 12.1 | 16.9 | 39.9
NL Industries |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income (loss) of subsidiaries | 2.5 | 4.4 | (7.0)
CompX International |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income (loss) of subsidiaries | 1.4 | 2.2 | 2.0
BMI |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income (loss) of subsidiaries | 7.6 | 2.2 | 1.5
LandWell |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income (loss) of subsidiaries | $ 10.2 | $ 3.3 | $ 2.4

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