Accounts Payable and Accrued Liabilities - Schedule of Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Accounts payable:
Accounts payable	$ 128.8	$ 199.4
Current accrued liabilities:
Deferred income	101.1	110.7
Employee benefits	36.5	34.4
Accrued sales discounts and rebates	18.2	25.6
Accrued litigation settlement	11.8	11.8
Operating lease liabilities	$ 3.8	$ 3.8
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Total	Total
Environmental remediation and related costs	$ 2.8	$ 3.8
Interest	1.1	4.9
Other	55.4	60.4
Total	392.9	477.7
Kronos Worldwide, Inc.
Accounts payable:
Accounts payable	117.9	177.2
CompX
Accounts payable:
Accounts payable	4.0	3.5
BMI/LandWell
Accounts payable:
Accounts payable	6.9	18.7
Contran | Income Taxes Payable
Current payables to affiliates:
Payable to affiliates	13.3	5.8
Contran | Trade items payables
Current payables to affiliates:
Payable to affiliates	0.1	0.0
LPC
Current payables to affiliates:
Payable to affiliates	$ 20.0	$ 17.1