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Long-term debt - Kronos 9.50 Senior Secured Notes - Additional Information (Detail) $ in Millions |  |  |  | 9 Months Ended |  |  |  |  |  |  |  |  |
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Jul. 30, 2024 USD ($) | Feb. 14, 2024 USD ($) | Feb. 12, 2024 USD ($) | Feb. 12, 2024 EUR (€) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 EUR (€) | Aug. 31, 2024 | Jul. 31, 2024 | Jul. 30, 2024 EUR (€) | Jul. 17, 2024 USD ($) | Jul. 16, 2024 USD ($) | Jun. 30, 2024 USD ($) | Feb. 14, 2024 EUR (€) | Dec. 31, 2023 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Kronos term loan from Contran |  |  |  |  | $ 53.7 | $ 0.0 |  |  |  |  |  |  |  |  |
3.75% Senior Secured Notes due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining outstanding | € |  |  |  |  |  |  |  |  |  |  |  |  |  | € 75,000,000 |
Kronos Worldwide, Inc. | On or Before March 15, 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption price percentage |  |  | 109.50% | 109.50% |  |  |  |  |  |  |  |  |  |  |
Kronos Worldwide, Inc. | Global Revolver Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | $ 300.0 | $ 225.0 | $ 300.0 |  |
Kronos Worldwide, Inc. | Kronos International, Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt, carrying amount |  |  |  |  | $ 25.0 |  |  |  |  |  |  |  |  |  |
Kronos Worldwide, Inc. | 9.50% Senior Secured Notes due 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate |  |  |  | 9.50% |  |  |  |  |  | 9.50% |  |  |  |  |
Debt instrument principal amount | € |  |  |  | € 276,174,000 |  |  |  |  |  | € 75,000,000 |  |  |  |  |
Debt Instrument Exchanged, Principal Amount of Each Instrument | € |  |  |  | 850 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Exchanged, Cash Paid For Each Instrument | € |  |  |  | € 150 |  |  |  |  |  |  |  |  |  |  |
Premium percentage |  |  |  |  |  |  |  |  |  | 107.50% |  |  |  |  |
Net proceeds from issuance | $ 90.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption price percentage |  |  | 100.00% | 100.00% |  |  |  |  |  |  |  |  |  |  |
Kronos Worldwide, Inc. | 9.50% Senior Secured Notes due 2029 | On or After March 15, 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption price percentage |  |  | 104.75% | 104.75% |  |  |  |  |  |  |  |  |  |  |
Kronos Worldwide, Inc. | 9.50% Senior Secured Notes due 2029 | On or After March 15, 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption price percentage |  |  | 100.00% | 100.00% |  |  |  |  |  |  |  |  |  |  |
Kronos Worldwide, Inc. | 9.50% Senior Secured Notes due 2029 | On or Before March 15, 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, percentage of debt that may be redeemed |  |  | 40.00% | 40.00% |  |  |  |  |  |  |  |  |  |  |
Minimum redemption outstanding debt percentage |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |
Kronos Worldwide, Inc. | 9.50% Senior Secured Notes due 2029 | Certain Change Of control events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument redemption price percent if experiences certain specified change of control events |  |  | 101.00% | 101.00% |  |  |  |  |  |  |  |  |  |  |
Kronos Worldwide, Inc. | 9.50% Senior Secured Notes due 2029 | Kronos International, Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate |  |  |  |  | 9.50% |  | 9.50% |  |  | 9.50% |  |  |  |  | 9.50%
Debt instrument, payment terms |  |  |  |  | bear interest at 9.50% per annum, payable semi-annually on March 15 and September 15 of each year, payments began on September 15, 2024 |  |  |  |  |  |  |  |  |  |
Frequency of debt instrument payment |  |  |  |  | semi-annually |  |  |  |  |  |  |  |  |  |
Debt instrument, date of first semi-annual interest payment |  |  | --03-15 | --03-15 |  |  |  |  |  |  |  |  |  |  |
Debt instrument, date of second semi-annual interest payment |  |  | --09-15 | --09-15 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, date of first required semi-annual payment |  |  | Sep. 15, 2024 | Sep. 15, 2024 |  |  |  |  |  |  |  |  |  |  |
Long term debt, carrying amount |  |  |  |  | $ 391.7 |  | € 351,174,000 |  |  |  |  |  |  |  |
Unamortized debt issuance costs |  |  |  |  | 7.1 |  |  |  |  |  |  |  |  |  |
Unamortized premium | € |  |  |  |  |  |  | € 5,400,000 |  |  |  |  |  |  |  |
Debt issuance costs, gross |  |  |  |  | $ 7.9 |  |  |  |  |  |  |  |  |  |
Kronos Worldwide, Inc. | 9.50% Senior Secured Notes due 2029 | Kronos International, Inc | Direct Domestic Subsidiary of KII and Guarantors | Collateral Pledged |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent company ownership interest |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Kronos Worldwide, Inc. | 9.50% Senior Secured Notes due 2029 | Kronos International, Inc | Foreign Subsidiary Directly Owned by KII or any Guarantor | Collateral Pledged |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent company ownership interest |  |  |  | 65.00% |  |  |  |  |  |  |  |  |  |  |
Kronos Worldwide, Inc. | 9.50% Senior Secured Notes due 2029 | Kronos International, Inc | Foreign Subsidiary Directly Owned by KII or any Guarantor | Collateral Pledged | Non-voting Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent company ownership interest |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Kronos Worldwide, Inc. | 3.75% Senior Secured Notes due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate |  |  |  | 3.75% |  |  |  |  |  |  |  |  |  |  |
Debt instrument principal amount | € |  |  |  | € 325,000,000 |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  | $ 52.6 |  | 48,750,000 |  |  |  |  |  |  |  |  |  |  |
Debt instrument, par value | € |  |  |  | 1,000 |  |  |  |  |  |  |  |  |  |  |
Kronos Worldwide, Inc. | 3.75% Senior Secured Notes due 2025 | Kronos International, Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate |  |  |  |  | 3.75% |  | 3.75% |  |  |  |  |  |  |  | 3.75%
Debt instrument principal amount | € |  |  |  |  |  |  | € 75,000,000 |  |  |  |  |  |  |  |
Long term debt, carrying amount |  |  |  |  | $ 83.9 |  |  |  |  |  |  |  |  |  | $ 440.9
Interest charge included in interest expense |  |  |  |  | $ 1.5 |  |  |  |  |  |  |  |  |  |
Kronos Worldwide, Inc. | Subordinated, unsecured term loan from Contran |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate |  |  |  |  |  |  |  | 9.54% | 11.50% |  |  |  |  |  |
Debt instrument principal amount | € |  |  |  | € 50,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Kronos term loan from Contran |  |  | $ 53.7 |  |  |  |  |  |  |  |  |  |  |  |
Kronos Worldwide, Inc. | Senior notes | Kronos International, Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount of other indebtedness default before triggering customary default provisions |  |  | $ 50.0 |  |  |  |  |  |  |  |  |  |  |  |

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