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Accounts payable and accrued liabilities - Schedule of Accounts Payable and Accrued Liabilities (Detail) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Accounts payable:    
Accounts payable $ 151.4 $ 228.5
Current accrued liabilities:    
Deferred income 69.1 88.8
Employee benefits 29.0 36.2
Accrued development costs 15.6 15.1
Accrued litigation settlement 11.9 11.8
Accrued sales discounts and rebates 10.5 22.5
Interest 4.4 5.1
Operating lease liabilities $ 3.6 $ 3.9
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Total Total
Environmental remediation and related costs $ 3.3 $ 3.7
Other 35.9 45.0
Total 366.8 490.7
Kronos Worldwide, Inc.    
Accounts payable:    
Accounts payable 143.9 218.7
CompX    
Accounts payable:    
Accounts payable 3.1 3.1
BMI/LandWell    
Accounts payable:    
Accounts payable 4.4 6.7
Contran | Income Taxes Payable    
Current accrued liabilities:    
Other 11.1 10.2
Louisiana Pigment Company    
Current accrued liabilities:    
Other $ 21.0 $ 19.9