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Noncontrolling interest in Subsidiaries - Schedule of Noncontrolling Interest in Net Income of Subsidiaries (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income (loss) of subsidiaries | $ 38.8 | $ 95.1 | $ 12.9
Kronos Worldwide, Inc. |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income (loss) of subsidiaries | 39.9 | 69.3 | 8.3
NL Industries |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income (loss) of subsidiaries | (7.0) | 19.7 | 2.6
CompX International |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income (loss) of subsidiaries | 2.0 | 1.7 | 1.4
BMI |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income (loss) of subsidiaries | 1.5 | 3.2 | (0.4)
LandWell |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income (loss) of subsidiaries | $ 2.4 | $ 1.2 | $ 1.0

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