Organization and basis of presentation - Additional Information (Details) |
Jun. 30, 2025 |
|---|---|
| Kronos | |
| Significant Accounting Policies [Line Items] | |
| Parent company ownership interest | 31.00% |
| Parent Company | Valhi Inc | |
| Significant Accounting Policies [Line Items] | |
| Parent company ownership interest | 83.00% |
| Parent Company | Valhi Inc | Contran Corporation | |
| Significant Accounting Policies [Line Items] | |
| Parent company ownership interest | 91.00% |