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Accounts payable and accrued liabilities - Schedule of Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Accounts payable: |  |
Accounts payable | $ 250.0 | $ 228.5
Current accrued liabilities: |  |
Employee benefits | 38.7 | 36.2
Accrued development costs | 30.0 | 15.1
Deferred income | 28.2 | 88.8
Accrued sales discounts and rebates | 27.6 | 22.5
Interest | 11.4 | 5.1
Operating lease liabilities | $ 3.5 | $ 3.9
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Total | Total
Other | $ 59.7 | $ 45.0
Total | 199.1 | 216.6
Noncurrent accrued liabilities: |  |
Accrued development costs | 26.8 | 42.3
Operating lease liabilities | 17.1 | 18.6
Insurance claims and expenses | 16.6 | 14.9
Deferred income | 11.8 | 15.5
Asset retirement obligations | 14.3 | 7.2
Other postretirement benefits | 6.7 | 7.4
Employee benefits | 4.5 | 4.9
Earn-out liability | 4.3 |
Other | 0.6 | 0.6
Total | 102.7 | 111.4
Kronos Worldwide |  |
Accounts payable: |  |
Accounts payable | 232.4 | 218.7
CompX |  |
Accounts payable: |  |
Accounts payable | 3.7 | 3.1
BMI/LandWell |  |
Accounts payable: |  |
Accounts payable | 8.0 | $ 6.7
Other |  |
Accounts payable: |  |
Distributions payable to noncontrolling interest | $ 5.9 |

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