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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