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Related party transactions - Receivables from and Payables to Affiliates (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Current receivables from affiliates: |  |
Current receivables from affiliates | $ 0.8 | $ 17.5
Current payables to affiliates: |  |
Other liabilities, primarily current | 17.1 | 30.1
Payables to affiliate included in long-term debt: |  |
Valhi - Contran credit facility | 563.4 | 546.5
Long-term debt | 484.4 | 545.8
Related Party |  |
Current receivables from affiliates: |  |
Current receivables from affiliates | 0.8 | 17.5
Current payables to affiliates: |  |
Other liabilities, primarily current | 17.1 | 30.1
Payables to affiliate included in long-term debt: |  |
Long-term debt | 98.3 | 93.4
Contran |  |
Current receivables from affiliates: |  |
Contran trade items | 0.2 | 0.2
Current payables to affiliates: |  |
Contran income taxes | 16.9 | 10.2
Contran | Contran |  |
Noncurrent payable to affiliates: |  |
Contran - income taxes |  | 18.5
Louisiana Pigment Company |  |
Current receivables from affiliates: |  |
Current receivables from affiliates |  | 16.9
Current payables to affiliates: |  |
Other liabilities, primarily current |  | 19.9
VALHI, INC. | Contran | Credit Facility. |  |
Payables to affiliate included in long-term debt: |  |
Valhi - Contran credit facility | 44.6 | 93.4
Kronos | Contran | Term loan |  |
Payables to affiliate included in long-term debt: |  |
Kronos - Contran Term Loan | 53.7 |
Other Affiliates |  |
Current receivables from affiliates: |  |
Current receivables from affiliates | $ 0.6 | $ 0.4

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