v3.25.4
Noncontrolling interest in subsidiaries - Noncontrolling Interest in Net Assets of Subsidiaries (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Noncontrolling interest in net assets:    
Noncontrolling interest in subsidiaries $ 340.5 $ 343.0
Kronos Worldwide    
Noncontrolling interest in net assets:    
Noncontrolling interest in subsidiaries 197.6 210.3
NL Industries    
Noncontrolling interest in net assets:    
Noncontrolling interest in subsidiaries 75.1 81.5
CompX International    
Noncontrolling interest in net assets:    
Noncontrolling interest in subsidiaries 18.0 19.0
BMI    
Noncontrolling interest in net assets:    
Noncontrolling interest in subsidiaries 25.0 18.7
LandWell    
Noncontrolling interest in net assets:    
Noncontrolling interest in subsidiaries $ 24.8 $ 13.5