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Long-term debt - Kronos 3.75 Senior Secured Notes - Additional Information (Detail) - Kronos Worldwide, Inc. - Kronos International, Inc € in Millions, $ in Millions			12 Months Ended
	Feb. 12, 2024 USD ($)	Sep. 13, 2017 EUR (€)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Sep. 13, 2017 USD ($)
Debt Instrument [Line Items]
Maximum amount of other indebtedness default before triggering customary default provisions	$ 50.0
Collateral Pledged \| Direct Domestic Subsidiary of KII and Guarantors
Debt Instrument [Line Items]
Parent company ownership interest	100.00%
Collateral Pledged \| Foreign Subsidiary Directly Owned by KII or any Guarantor
Debt Instrument [Line Items]
Parent company ownership interest	65.00%
Non-voting Common Stock \| Collateral Pledged \| Foreign Subsidiary Directly Owned by KII or any Guarantor
Debt Instrument [Line Items]
Parent company ownership interest	100.00%
3.75% Senior Secured Notes due September 15, 2025
Debt Instrument [Line Items]
Debt instrument interest rate		3.75%	3.75%		3.75%
Debt instrument maturity date		Sep. 15, 2025
Debt instrument principal amount		€ 400			$ 477.6
Unamortized debt issuance costs			$ 1.6	$ 2.4
Debt instrument, payment terms			bear interest at 3.75% per annum,
Frequency of debt instrument payment			semi-annually
Debt Instrument, date of first required semi-annual payment		Mar. 15, 2018
Debt instrument redemption price percent if experiences certain specified change of control events		101.00%
3.75% Senior Secured Notes due September 15, 2025 \| Redeem the Old Notes
Debt Instrument [Line Items]
Debt instrument, redemption price percentage		100.00%