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Accounts payable and accrued liabilities - Schedule of Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Accounts payable: |  |
Accounts payable | $ 166.9 | $ 250.0
Payables to affiliates: |  |
Employee benefits | 42.0 | 38.7
Deferred income | 25.9 | 28.2
Accrued sales discounts and rebates | 20.7 | 27.6
Accrued development costs | 20.1 | 30.0
Accrued litigation settlement | 16.7 | 16.4
Operating lease liabilities | $ 4.4 | $ 3.5
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Total | Total
Interest | $ 2.5 | $ 11.4
Other | 56.8 | 59.7
Total | 359.0 | 482.6
Kronos Worldwide |  |
Accounts payable: |  |
Accounts payable | 161.0 | 232.4
CompX |  |
Accounts payable: |  |
Accounts payable | 3.2 | 3.7
BMI/LandWell |  |
Accounts payable: |  |
Accounts payable | 2.7 | 8.0
Other |  |
Accounts payable: |  |
Distributions payable to noncontrolling interest |  | 5.9
Contran | Income Taxes Payable |  |
Accounts payable: |  |
Income taxes payable current | 0.5 | 16.9
Contran | Other payables |  |
Payables to affiliates: |  |
Payables to affiliates | $ 2.5 | $ 0.2

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