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Accounts and other receivables - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Apr. 01, 2026	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
Expected credit loss reversal	$ 5,000	$ 0	$ 0	$ 5,000	$ 0
Provision for expected credit loss		5,304		5,304		$ 10,304
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| VRB China \| VRB
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sale of equity method investment	$ 5,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Pinaya Gold-Copper Disposal Group
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other receivables		$ 6,500		$ 6,500