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