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Noncontrolling interest in subsidiaries - Schedule of Noncontrolling Interest in Net Income of Subsidiaries (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Noncontrolling interest in net income (loss) of subsidiaries:      
Noncontrolling interest in net income of subsidiaries $ 15.0 $ 45.9 $ 70.5
Kronos Worldwide, Inc.      
Noncontrolling interest in net income (loss) of subsidiaries:      
Noncontrolling interest in net income of subsidiaries (9.5) 20.0 22.0
NL      
Noncontrolling interest in net income (loss) of subsidiaries:      
Noncontrolling interest in net income of subsidiaries (0.4) 5.8 8.7
CompX      
Noncontrolling interest in net income (loss) of subsidiaries:      
Noncontrolling interest in net income of subsidiaries 2.9 2.6 2.2
BMI      
Noncontrolling interest in net income (loss) of subsidiaries:      
Noncontrolling interest in net income of subsidiaries 8.2 2.8 14.7
LandWell      
Noncontrolling interest in net income (loss) of subsidiaries:      
Noncontrolling interest in net income of subsidiaries $ 13.8 $ 14.7 $ 22.9