Accounts and other receivables, net - Components of Accounts and Other Receivables (Detail) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Trade accounts receivable:
VAT and other receivables	$ 26.3	$ 33.4
Refundable income taxes	2.5	1.8
Allowance for doubtful accounts	(3.6)	(4.2)
Total	397.6	340.4
Trade Accounts Receivable | Kronos
Trade accounts receivable:
Trade Accounts receivable	355.7	273.6
Trade Accounts Receivable | CompX
Trade accounts receivable:
Trade Accounts receivable	15.5	17.1
Trade Accounts Receivable | BMI/LandWell
Trade accounts receivable:
Trade Accounts receivable	0.5	1.2
Louisiana Pigment Company, L.P. (LPC)
Trade accounts receivable:
Receivables from affiliates		16.9
Contran | Trade Items
Trade accounts receivable:
Receivables from affiliates	0.2	0.2
Other | Trade Items
Trade accounts receivable:
Receivables from affiliates	$ 0.5	$ 0.4