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Related party transactions - Receivables from and Payables to Affiliates (Detail) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Related Party Transaction [Line Items]    
Other liabilities, primarily current $ 30.1 $ 22.9
Current receivables from affiliates 17.5 2.9
Payables to affiliate included in long-term debt 111.4 129.0
Current receivables from affiliates:    
Current receivables from affiliates 17.5 2.9
Current payables to affiliates 30.1 22.9
Payables to affiliate included in long-term debt 111.4 129.0
Related Party [Member]    
Related Party Transaction [Line Items]    
Other liabilities, primarily current 30.1 22.9
Current receivables from affiliates 17.5 2.9
Current receivables from affiliates:    
Current receivables from affiliates 17.5 2.9
Current payables to affiliates 30.1 22.9
Contran    
Related Party Transaction [Line Items]    
Contran trade items 0.2 0.2
Contran income taxes 10.2 5.8
Contran | Contran    
Related Party Transaction [Line Items]    
Contran - income taxes 18.5 33.4
Louisiana Pigment Company    
Related Party Transaction [Line Items]    
Other liabilities, primarily current 19.9 17.1
Current receivables from affiliates 16.9  
Current receivables from affiliates:    
Current receivables from affiliates 16.9  
Current payables to affiliates 19.9 17.1
VALHI, INC. | Contran | Credit Facility.    
Related Party Transaction [Line Items]    
Payables to affiliate included in long-term debt 93.4 121.4
Current receivables from affiliates:    
Payables to affiliate included in long-term debt 93.4 121.4
Other Affiliates    
Related Party Transaction [Line Items]    
Current receivables from affiliates 0.4 2.7
Current receivables from affiliates:    
Current receivables from affiliates $ 0.4 $ 2.7