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Related party transactions - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Feb. 29, 2024
Dec. 31, 2019
Related Party Transaction [Line Items]          
Intercorporate service fees $ 211.2 $ 231.3 $ 248.9    
Insurance Premiums          
Related Party Transaction [Line Items]          
Expense transaction with affiliate 24.8 20.8 23.2    
Contran Corporation [Member]          
Related Party Transaction [Line Items]          
Expense transaction with affiliate 0.4 0.3 0.3    
Sublease rent expense 0.6 0.5 0.4    
Contran Corporation [Member] | Intercorporate Services Agreement          
Related Party Transaction [Line Items]          
Intercorporate service fees 22.6 24.5 24.0    
Louisiana Pigment Company, L.P. | Titanium Dioxide Pigments          
Related Party Transaction [Line Items]          
Purchase of TiO2 231.7 225.6 188.6    
Louisiana Pigment Company, L.P. | Titanium Dioxide Feedstock          
Related Party Transaction [Line Items]          
Sale of feedstock ore to LPC 135.1 106.9 85.4    
Valhi Inc [Member] | Unsecured Revolving Demand Promissory Note          
Related Party Transaction [Line Items]          
Outstanding loans under promissory note $ 0.0 0.0      
Maximum lending capacity         $ 25.0
Interest payable quarterly for the loan prime plus 1.00%        
Valhi Inc [Member] | Unsecured Revolving Demand Promissory Note | Contran Corporation [Member]          
Related Party Transaction [Line Items]          
Outstanding loans under promissory note       $ 53.7  
Valhi Inc [Member] | Unsecured Revolving Demand Promissory Note | Interest Income          
Related Party Transaction [Line Items]          
Interest income on loan $ 0.1 0.2 0.2    
Tall Pines Insurance Company | Insurance Premiums          
Related Party Transaction [Line Items]          
Expense transaction with affiliate $ 19.6 $ 17.3 $ 18.6