Long-term debt - Kronos 9.50 Senior Secured Notes - Additional Information (Detail) - Kronos Worldwide, Inc. - Kronos International, Inc $ in Millions			12 Months Ended
	Feb. 12, 2024 EUR (€)	Sep. 13, 2017 EUR (€)	Dec. 31, 2023	Sep. 13, 2017 USD ($)
9.50% Senior Secured Notes due March 15, 2029
Debt Instrument [Line Items]
Debt instrument interest rate	9.50%
Principal amount	€ 325,000,000
Debt instrument principal amount	276,174,000
Cash consideration	€ 50,000,000
Debt instrument, payment terms			bear interest at 9.50% per annum
Frequency of debt instrument payment			semi-annually
Debt Instrument, date of first required semi-annual payment	Sep. 15, 2024
Debt instrument maturity date	Mar. 15, 2029
Debt instrument, redemption, description			have a maturity date of March 15, 2029. Prior to March 15, 2026, Kronos may redeem some or all of the New Notes at a price equal to 100% of the principal amount thereof, plus an applicable premium as of the date of the redemption as described in the indenture governing its New Notes, plus accrued and unpaid interest. On or after March 15, 2026, Kronos may redeem the New Notes at redemption prices ranging from 104.750% of the principal amount, declining to 100% on or after March 15, 2028, plus accrued and unpaid interest. In addition, on or before March 15, 2026, Kronos may redeem up to 40% of the New Notes with the net proceeds of certain public or private equity offerings at 109.50% of the principal amount, plus accrued and unpaid interest, provided that following the redemption at least 50% of the New Notes remain outstanding. If Kronos or Kronos’ subsidiaries experience certain change of control events, as outlined in the indenture governing its New Notes, Kronos would be required to make an offer to purchase the New Notes at 101% of the principal amount thereof, plus accrued and unpaid interest. Kronos would also be required to make an offer to purchase a specified portion of the New Notes at par value, plus accrued and unpaid interest, in the event that Kronos and its subsidiaries generate a certain amount of net proceeds from the sale of assets outside the ordinary course of business, and such net proceeds are not otherwise used for specified purposes within a specified time period as described in the indenture governing Kronos’ New Notes
Debt Instrument Exchanged, Principal Amount of Each Instrument	€ 850
Debt Instrument Exchanged, Cash Paid For Each Instrument	150
Debt Instrument Not Exchanged, Dace Amount	€ 75,000,000
9.50% Senior Secured Notes due March 15, 2029 | Prior to March 15, 2026
Debt Instrument [Line Items]
Debt instrument, redemption price percentage	100.00%
9.50% Senior Secured Notes due March 15, 2029 | On or After March 15, 2026
Debt Instrument [Line Items]
Debt instrument, redemption price percentage	104.75%
9.50% Senior Secured Notes due March 15, 2029 | On or After March 15, 2028
Debt Instrument [Line Items]
Debt instrument, redemption price percentage	100.00%
9.50% Senior Secured Notes due March 15, 2029 | On or Before March 15, 2026
Debt Instrument [Line Items]
Debt instrument, redemption price percentage	109.50%
Debt instrument, percentage of debt that may be redeemed	40.00%
Minimum redemption outstanding debt percentage	50.00%
9.50% Senior Secured Notes due March 15, 2029 | Certain Change Of control events
Debt Instrument [Line Items]
Debt instrument, redemption price percentage	101.00%
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 principal amount		€ 400,000,000		$ 477.6
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 maturity date		Sep. 15, 2025
Debt instrument, redemption, description			have a maturity date of September 15, 2025. Kronos may redeem the Old Notes at 100%, plus accrued and unpaid interest. If Kronos experiences certain specified change of control events as outlined in the indenture governing its Old Notes, it would be required to make an offer to purchase the Old Notes at 101% of the principal amount, plus accrued and unpaid interest. Kronos would also be required to make an offer to purchase a specified portion of the Old Notes at par value, plus accrued and unpaid interest, in the event that it generates a certain amount of net proceeds from the sale of assets outside the ordinary course of business, and such net proceeds are not otherwise used for specified purposes within a specified time period as described in the indenture governing its Old Notes
Debt instrument, par value	€ 1,000
3.75% Senior Secured Notes due September 15, 2025 | On or After March 15, 2028
Debt Instrument [Line Items]
Debt instrument, redemption price percentage		100.00%