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Auditors' remuneration - Auditors' remuneration (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Auditors Remuneration [Line Items]      
Audit of the Group $ 16.7 $ 14.3 $ 13.5
Audit-related assurance service 0.9 1.0 0.9
Other assurance services 3.3 2.3 0.6
Total assurance services 4.2 3.3 1.5
Tax compliance   0.3 0.5
Tax advisory services   0.2 0.1
Other non-audit services not covered above 0.2 0.7 1.8
Total non-audit services 4.4 4.5 3.9
Total Group Auditors’ remuneration 21.1 18.8 17.4
Audit of the financial statements of the Group’s subsidiaries 1.4 2.0 2.1
Fees in respect of pension scheme audits 0.1 0.5 0.3
Total audit fees payable to other accounting firms 1.5 2.5 2.4
Rio Tinto [member]      
Auditors Remuneration [Line Items]      
Audit of the Group 9.2 6.2 4.5
Subsidiaries [Member]      
Auditors Remuneration [Line Items]      
Audit of the Group $ 7.5 $ 8.1 $ 9.0