Accounts Payable and Accrued Liabilities - Schedule of Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Accounts payable:
Accounts payable	$ 145.7	$ 199.4
Current accrued liabilities:
Deferred income	83.4	110.7
Employee benefits	31.8	34.4
Accrued sales discounts and rebates	13.1	25.6
Accrued litigation settlement	11.9	11.8
Operating lease liabilities	$ 4.1	$ 3.8
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Total	Total
Environmental remediation and related costs	$ 2.9	$ 3.8
Interest	5.0	4.9
Other	58.5	60.4
Total	385.5	477.7
Kronos Worldwide, Inc.
Accounts payable:
Accounts payable	134.7	177.2
CompX
Accounts payable:
Accounts payable	5.2	3.5
BMI/LandWell
Accounts payable:
Accounts payable	5.8	18.7
Contran | Income Taxes Payable
Current payables to affiliates:
Payable to affiliates	10.1	5.8
LPC
Current payables to affiliates:
Payable to affiliates	$ 19.0	$ 17.1