Accounts Payable and Accrued Liabilities - Schedule of Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts payable:
Accounts payable	$ 152.7	$ 117.6
Current accrued liabilities:
Deferred income	125.8	20.1
Employee benefits	39.9	37.5
Accrued sales discounts and rebates	28.7	30.2
Interest	5.3	5.7
Operating lease liabilities	3.7	6.7
Environmental remediation and related costs	3.5	3.4	$ 4.5
Other	57.9	39.4
Total	$ 264.8	$ 143.0
Operating Lease Liability Current Statement Of Financial Position Extensible List	Total	Total
Noncurrent accrued liabilities:
Deferred income	$ 81.6	$ 58.9
Accrued development costs	55.4	24.6
Insurance claims and expenses	36.4	39.3
Operating lease liabilities	$ 15.8	$ 18.8
Operating Lease Liability Noncurrent Statement Of Financial Position Extensible List	Total	Total
Other postretirement benefits	$ 10.2	$ 10.8
Employee benefits	6.1	6.2
Reserve for uncertain tax positions	3.5	6.8
Deferred payment obligation		1.3
Other	10.0	7.8
Total	219.0	174.5
Kronos Worldwide, Inc.
Accounts payable:
Accounts payable	143.6	111.0
CompX
Accounts payable:
Accounts payable	3.4	2.6
BMI and LandWell
Accounts payable:
Accounts payable	5.3	3.6
Others
Accounts payable:
Accounts payable	$ 0.4	$ 0.4