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Long-term debt - Subordinated, Unsecured Term Loan from Contran (Details) - Kronos Worldwide, Inc. - Subordinated, unsecured term loan from Contran - EUR (€) € in Millions	1 Months Ended
	Aug. 31, 2024	Jul. 31, 2024	Feb. 12, 2024
Debt Instrument [Line Items]
Debt instrument principal amount			€ 50.0
Interest rate	9.54%	11.50%
Interest rate spread	2.00%

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