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Fair value measurements and financial instruments - Additional Information (Detail) - Kronos Worldwide, Inc. - Kronos International, Inc - EUR (€)
Mar. 31, 2024
Feb. 12, 2024
Dec. 31, 2023
9.50% Senior Secured Notes due March 15, 2029      
Financial Instrument At Fair Value [Line Items]      
Interest rate 9.50% 9.50% 9.50%
Estimated market price of the notes € 1,069    
Principal amount of debt instrument € 1,000    
3.75% Senior Secured Notes due September 15, 2025      
Financial Instrument At Fair Value [Line Items]      
Interest rate 3.75% 3.75% 3.75%
Estimated market price of the notes € 987    
Principal amount of debt instrument € 1,000