Accounts Payable and Accrued Liabilities - Schedule of Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Accounts payable:
Accounts payable	$ 152.9	$ 152.7
Payable to affiliates:
Accrued litigation settlement	11.9	11.8
Deferred income	112.5	125.8
Employee benefits	30.4	39.9
Accrued sales discounts and rebates	17.1	28.7
Interest	4.9	5.3
Operating lease liabilities	$ 3.5	$ 3.7
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Total	Total
Environmental remediation and related costs	$ 4.0	$ 3.5
Other	58.1	57.9
Total	429.1	448.1
Kronos Worldwide, Inc.
Accounts payable:
Accounts payable	137.9	143.6
CompX
Accounts payable:
Accounts payable	6.4	3.4
BMI/LandWell
Accounts payable:
Accounts payable	7.9	5.3
Other
Accounts payable:
Accounts payable	0.7	0.4
Contran | Income Taxes Payable
Payable to affiliates:
Payable to affiliates	11.2	1.5
LPC
Payable to affiliates:
Payable to affiliates	$ 22.6	$ 17.3