Accounts Payable and Accrued Liabilities - Schedule of Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Accounts payable:
Accounts payable	$ 188.5	$ 152.7
Payable to affiliates:
Deferred income	105.4	125.8
Employee benefits	34.1	39.9
Accrued sales discounts and rebates	22.5	28.7
Accrued litigation settlement	11.8	11.8
Interest	1.0	5.3
Operating lease liabilities	$ 3.8	$ 3.7
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Total	Total
Environmental remediation and related costs	$ 3.8	$ 3.5
Other	74.3	57.9
Total	479.2	448.1
Kronos Worldwide, Inc.
Accounts payable:
Accounts payable	169.2	143.6
CompX
Accounts payable:
Accounts payable	5.2	3.4
BMI/LandWell
Accounts payable:
Accounts payable	13.5	5.3
Other
Accounts payable:
Accounts payable	0.6	0.4
Contran | Income Taxes Payable
Payable to affiliates:
Payable to affiliates	13.2	1.5
LPC
Payable to affiliates:
Payable to affiliates	$ 20.8	$ 17.3