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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |  |
Noncontrolling interest in net income of subsidiaries | $ 8.7 | $ 46.3 | $ 27.2 | $ 55.4
Kronos Worldwide, Inc. |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |  |
Noncontrolling interest in net income of subsidiaries |  |  | 29.0 | 45.6
NL Industries |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |  |
Noncontrolling interest in net income of subsidiaries |  |  | (4.8) | 8.4
CompX International |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |  |
Noncontrolling interest in net income of subsidiaries |  |  | 1.1 | 0.9
BMI |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |  |
Noncontrolling interest in net income of subsidiaries |  |  | 0.7 | 0.2
LandWell |  |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |  |
Noncontrolling interest in net income of subsidiaries |  |  | $ 1.2 | $ 0.3

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