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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% |  |

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