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Commitments and contingencies (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2026	Dec. 31, 2023	Dec. 31, 2025
Other Disclosures [Line Items]
Contingent liabilities indemnities and other performance guarantees	$ 338.0		$ 322.0
Contingent liabilities incurred in relation to interests in joint ventures	0.0		0.0
Capital commitments	$ 7,495.0		8,173.0
Simfer Jersey Limited \| Winning Consortium Simandou Railway Pte Ltd And Winning Consortium Simandou Ports Pte Ltd
Other Disclosures [Line Items]
Proportion of ownership interest in associate	34.00%
Rio Tinto Finance Usa Limited And Rio Tinto Finance Usa Plc \| Contingent liabilities related to joint ventures
Other Disclosures [Line Items]
Contractual payments		$ 10.5
Total for all joint ventures
Other Disclosures [Line Items]
Capital commitments	$ 656.0		$ 737.0