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Auditors' remuneration - Auditors' remuneration (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Auditors Remuneration [Line Items]      
Total audit $ 17.3 $ 16.4 $ 16.7
Audit-related assurance service 0.8 0.8 0.9
Other assurance services 1.4 1.9 3.3
Total assurance services 2.2 2.7 4.2
Tax compliance 0.0 0.1 0.0
Other non-audit services not covered above 0.1 0.0 0.2
Total non-audit services 2.3 2.8 4.4
Total Group Auditors’ remuneration 19.6 19.2 21.1
Audit of the financial statements of the Group’s subsidiaries(c) 0.6 1.4 1.4
Fees in respect of pension scheme audits 0.1 0.1 0.1
Total audit fees payable to other accounting firms 0.7 1.5 1.5
Rio Tinto      
Auditors Remuneration [Line Items]      
Total audit 11.0 9.6 9.2
Subsidiaries      
Auditors Remuneration [Line Items]      
Total audit $ 6.3 $ 6.8 $ 7.5