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v3.24.0.1

Related party transactions - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Feb. 29, 2024 | Dec. 31, 2019
Related Party Transaction [Line Items] |  |  |  |  |
Intercorporate service fees | $ 211.2 | $ 231.3 | $ 248.9 |  |
Insurance Premiums |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Expense transaction with affiliate | 24.8 | 20.8 | 23.2 |  |
Contran Corporation [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Expense transaction with affiliate | 0.4 | 0.3 | 0.3 |  |
Sublease rent expense | 0.6 | 0.5 | 0.4 |  |
Contran Corporation [Member] | Intercorporate Services Agreement |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Intercorporate service fees | 22.6 | 24.5 | 24.0 |  |
Louisiana Pigment Company, L.P. | Titanium Dioxide Pigments |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Purchase of TiO2 | 231.7 | 225.6 | 188.6 |  |
Louisiana Pigment Company, L.P. | Titanium Dioxide Feedstock |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Sale of feedstock ore to LPC | 135.1 | 106.9 | 85.4 |  |
Valhi Inc [Member] | Unsecured Revolving Demand Promissory Note |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Outstanding loans under promissory note | $ 0.0 | 0.0 |  |  |
Maximum lending capacity |  |  |  |  | $ 25.0
Interest payable quarterly for the loan | prime plus 1.00% |  |  |  |
Valhi Inc [Member] | Unsecured Revolving Demand Promissory Note | Contran Corporation [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Outstanding loans under promissory note |  |  |  | $ 53.7 |
Valhi Inc [Member] | Unsecured Revolving Demand Promissory Note | Interest Income |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Interest income on loan | $ 0.1 | 0.2 | 0.2 |  |
Tall Pines Insurance Company | Insurance Premiums |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Expense transaction with affiliate | $ 19.6 | $ 17.3 | $ 18.6 |  |

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