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Long-term debt - Kronos 3.75 Senior Secured Notes - Additional Information (Details) - Kronos Worldwide - 3.75% Senior Secured Notes due 2025 - Kronos International, Inc - EUR (€) € in Millions	Sep. 30, 2025	Sep. 15, 2025	Dec. 31, 2024
Long-term debt
Debt instrument interest rate	3.75%	3.75%	3.75%
Debt instrument principal amount	€ 75	€ 75

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