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Long-term debt - Revolving Credit Facility - Additional Information (Detail) - Kronos Worldwide, Inc. € in Millions, $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Apr. 20, 2021 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 EUR (€)
Global Revolver Credit Facility |  |  |
Line Of Credit Facility [Line Items] |  |  |
Borrowings on credit facilities |  | $ 0.0 |
Line of credit maximum borrowing capacity | $ 225.0 |  |
Line of credit, maturity month and year | 2026-04 |  |
Repayment of credit facility |  | 0.0 |
Amount available for borrowing |  | $ 225.0 |
Fixed charge coverage ratio, minimum value |  | 100.00% |
Global Revolver Credit Facility | Minimum | Variable Rate |  |  |
Line Of Credit Facility [Line Items] |  |  |
Interest rate on outstanding borrowings |  | 1.50% |
Global Revolver Credit Facility | Minimum | Base Rate Option |  |  |
Line Of Credit Facility [Line Items] |  |  |
Interest rate on outstanding borrowings |  | 0.50% |
Global Revolver Credit Facility | Maximum | Variable Rate |  |  |
Line Of Credit Facility [Line Items] |  |  |
Interest rate on outstanding borrowings |  | 2.00% |
Global Revolver Credit Facility | Maximum | Base Rate Option |  |  |
Line Of Credit Facility [Line Items] |  |  |
Interest rate on outstanding borrowings |  | 2.00% |
Canadian Subsidiary Revolving Borrowings Maximum |  |  |
Line Of Credit Facility [Line Items] |  |  |
Line of credit maximum borrowing capacity |  | $ 25.0 |
Belgian Subsidiary Revolving Borrowings Maximum |  |  |
Line Of Credit Facility [Line Items] |  |  |
Line of credit maximum borrowing capacity | € |  |  | € 30
German Subsidiary Revolving Borrowings Maximum |  |  |
Line Of Credit Facility [Line Items] |  |  |
Line of credit maximum borrowing capacity | € |  |  | € 60

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