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Auditors' remuneration (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Auditors Remuneration [Line Items]      
Total audit $ 28.1 $ 26.6 $ 25.7
Audit-related assurance service 1.7 1.1 1.0
Other assurance services 3.5 3.0 2.3
Total assurance services 5.2 4.1 3.3
Tax compliance 0.0 0.0 0.0
Other non-audit services not covered above 0.2 0.1 0.3
Total non-audit services 5.4 4.2 3.6
Total Group auditors’ remuneration 33.5 30.8 29.3
Audit fees 30.0 27.7 27.0
Audit-related fees 3.3 3.0 2.0
Tax fees 0.0 0.0 0.0
All other fees 0.2 0.1 0.3
Audit of the financial statements of the Group’s subsidiaries 0.3 0.3 0.2
Fees in respect of pension scheme audits 0.1 0.1 0.1
Total audit fees payable to other accounting firms 0.4 0.4 0.3
KPMG      
Auditors Remuneration [Line Items]      
Total Group auditors’ remuneration 33.5 30.8 29.3
Rio Tinto      
Auditors Remuneration [Line Items]      
Total audit 20.7 19.1 17.3
Total for all subsidiaries      
Auditors Remuneration [Line Items]      
Total audit $ 7.4 $ 7.5 $ 8.4