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Noncontrolling interest in Subsidiaries - Schedule of Noncontrolling Interest in Net Income of Subsidiaries (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries | $ 5.5 | $ 18.0 | $ 32.7 | $ 73.4
Kronos Worldwide, Inc. |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries |  |  | 35.3 | 60.0
NL Industries |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries |  |  | (7.4) | 11.4
CompX International |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries |  |  | 1.6 | 1.2
BMI |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries |  |  | 1.1 | 0.3
LandWell |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries |  |  | $ 2.1 | $ 0.5

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