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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
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Noncontrolling interest in net income (loss) of subsidiaries:      
Noncontrolling interest in net income (loss) of subsidiaries $ 29.0 $ 38.8 $ 95.1
Kronos Worldwide, Inc.      
Noncontrolling interest in net income (loss) of subsidiaries:      
Noncontrolling interest in net income (loss) of subsidiaries 16.9 39.9 69.3
NL Industries      
Noncontrolling interest in net income (loss) of subsidiaries:      
Noncontrolling interest in net income (loss) of subsidiaries 4.4 (7.0) 19.7
CompX International      
Noncontrolling interest in net income (loss) of subsidiaries:      
Noncontrolling interest in net income (loss) of subsidiaries 2.2 2.0 1.7
BMI      
Noncontrolling interest in net income (loss) of subsidiaries:      
Noncontrolling interest in net income (loss) of subsidiaries 2.2 1.5 3.2
LandWell      
Noncontrolling interest in net income (loss) of subsidiaries:      
Noncontrolling interest in net income (loss) of subsidiaries $ 3.3 $ 2.4 $ 1.2