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Noncontrolling interest in subsidiaries - Schedule of Noncontrolling Interest in Net Income of Subsidiaries (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Noncontrolling interest in net income (loss) of subsidiaries:      
Noncontrolling interest in net income of subsidiaries $ 53.3 $ 15.0 $ 45.9
Kronos Worldwide      
Noncontrolling interest in net income (loss) of subsidiaries:      
Noncontrolling interest in net income of subsidiaries 16.1 (9.5) 20.0
NL Industries      
Noncontrolling interest in net income (loss) of subsidiaries:      
Noncontrolling interest in net income of subsidiaries 11.4 (0.4) 5.8
CompX International      
Noncontrolling interest in net income (loss) of subsidiaries:      
Noncontrolling interest in net income of subsidiaries 2.0 2.9 2.6
BMI      
Noncontrolling interest in net income (loss) of subsidiaries:      
Noncontrolling interest in net income of subsidiaries 9.6 8.2 2.8
LandWell      
Noncontrolling interest in net income (loss) of subsidiaries:      
Noncontrolling interest in net income of subsidiaries $ 14.2 $ 13.8 $ 14.7