Accounts Payable and Accrued Liabilities - Schedule of Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounts payable:
Accounts payable	$ 199.4	$ 152.7
Current accrued liabilities:
Deferred income	110.7	125.8
Employee benefits	34.4	39.9
Accrued sales discounts and rebates	25.6	28.7
Interest	4.9	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	$ 3.4
Environmental Loss Contingency, Current, Statement of Financial Position [Extensible Enumeration]	Total	Total
Other	$ 60.4	$ 57.9
Total	243.6	264.8
Noncurrent accrued liabilities:
Accrued development costs	48.1	55.4
Deferred income	25.9	81.6
Insurance claims and expenses	18.7	36.4
Operating lease liabilities	$ 17.4	$ 15.8
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Total	Total
Other postretirement benefits	$ 7.1	$ 10.2
Employee benefits	4.8	6.1
Reserve for uncertain tax positions	0.3	3.5
Other	6.7	10.0
Total	129.0	219.0
Kronos Worldwide, Inc.
Accounts payable:
Accounts payable	177.2	143.6
CompX
Accounts payable:
Accounts payable	3.5	3.4
BMI/LandWell
Accounts payable:
Accounts payable	$ 18.7	5.3
Other
Accounts payable:
Accounts payable		$ 0.4