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Noncontrolling Interest in Subsidiaries - Noncontrolling Interest in Net Assets of Subsidiaries (Detail) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Noncontrolling interest in net assets:    
Noncontrolling interest in subsidiaries $ 340.2 $ 340.1
Kronos Worldwide, Inc.    
Noncontrolling interest in net assets:    
Noncontrolling interest in subsidiaries 213.5 216.6
NL Industries    
Noncontrolling interest in net assets:    
Noncontrolling interest in subsidiaries 66.5 65.8
CompX International    
Noncontrolling interest in net assets:    
Noncontrolling interest in subsidiaries 23.3 22.7
BMI    
Noncontrolling interest in net assets:    
Noncontrolling interest in subsidiaries 20.8 20.1
LandWell    
Noncontrolling interest in net assets:    
Noncontrolling interest in subsidiaries $ 16.1 $ 14.9