Accounts Payable and Accrued Liabilities - Schedule of Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Accounts payable:
Accounts payable	$ 156.6	$ 199.4
Current accrued liabilities:
Deferred income	100.1	110.7
Employee benefits	28.9	34.4
Accrued sales discounts and rebates	8.3	25.6
Litigation settlement	11.9	11.8
Interest	1.1	4.9
Operating lease liabilities	$ 3.7	3.8
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Total
Environmental remediation and related costs	$ 2.9	3.8
Other	52.2	60.4
Total	387.8	477.7
Noncurrent accrued liabilities:
Accrued development costs	45.8	48.1
Deferred income	22.0	25.9
Insurance claims and expenses	17.2	18.7
Operating lease liabilities	$ 17.2	$ 17.4
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Total	Total
Other postretirement benefits	$ 7.0	$ 7.1
Employee benefits	4.9	4.8
Reserve for uncertain tax positions	0.3	0.3
Other	7.1	6.7
Total	149.1	156.4
Kronos Worldwide, Inc.
Accounts payable:
Accounts payable	144.6	177.2
CompX
Accounts payable:
Accounts payable	3.9	3.5
BMI/LandWell
Accounts payable:
Accounts payable	8.1	18.7
Contran | Income Taxes Payable
Current payables to affiliates:
Payable to affiliates	3.1	5.8
LPC
Current payables to affiliates:
Payable to affiliates	$ 19.0	$ 17.1