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Accounts and other receivables, net - Components of Accounts and Other Receivables (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Trade accounts receivable:
VAT and other receivables	$ 30.7	$ 45.9
Refundable income taxes	1.0	1.3
Allowance for doubtful accounts	(4.6)	(3.9)
Total	366.6	327.8
Trade items | Contran
Trade accounts receivable:
Receivables from affiliates	0.1	0.2
Trade items | Other
Trade accounts receivable:
Receivables from affiliates	0.6	0.6
Kronos | Trade accounts receivable
Trade accounts receivable:
Trade Accounts receivable	319.4	269.2
CompX | Trade accounts receivable
Trade accounts receivable:
Trade Accounts receivable	18.2	14.2
BMI/LandWell | Trade accounts receivable
Trade accounts receivable:
Trade Accounts receivable	$ 1.2	$ 0.3

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Amount, after allowance, receivable from customers, clients, or other third-parties, and receivables classified as other due within one year or the normal operating cycle, if longer.

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Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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Amount of allowance for credit loss on accounts receivable, classified as current.

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