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Auditors' remuneration - Auditors' remuneration (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Auditors Remuneration [Line Items] |  |  |
Audit of subsidiaries | $ 14.3 | $ 13.5 | $ 14.4
Audit related assurance service | 1.0 | 0.9 | 0.9
Other assurance services | 2.3 | 0.6 | 0.9
Total assurance services | 3.3 | 1.5 | 1.8
Tax compliance | 0.3 | 0.5 | 0.5
Tax advisory services | 0.2 | 0.1 | 0.4
Services related to corporate finance transactions not covered above - services in connection with bond issues/capital raising |  |  | 0.2
Other non-audit services not covered above | 0.7 | 1.8 | 1.1
Total non-audit services | 4.5 | 3.9 | 4.0
Total Group Auditors’ remuneration | 18.8 | 17.4 | 18.4
Audit of the financial statements of the Group’s subsidiaries | 2.0 | 2.1 | 1.9
Fees in respect of pension scheme audits | 0.5 | 0.3 | 0.2
Total audit fees payable to other accounting firms | 2.5 | 2.4 | 2.1
Rio Tinto [member] |  |  |
Auditors Remuneration [Line Items] |  |  |
Audit of subsidiaries | 6.2 | 4.5 | 4.3
Subsidiaries [Member] |  |  |
Auditors Remuneration [Line Items] |  |  |
Audit of subsidiaries | $ 8.1 | $ 9.0 | $ 10.1

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- Definition The amount of fees paid or payable to the entity's auditors. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_112_c&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The amount of fees paid or payable to the entity's auditors for auditing services. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_112_c&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The amount of fees paid or payable to the entity's auditors for services that the entity does not separately disclose in the same statement or note. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_112_c&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The amount of fees paid or payable to the entity's auditors for tax services. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_112_c&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition Audit Fee Of Financial Statements Of Subsidiaries + References No definition available. + Details
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- Definition Audit Fees Payable To Subsidiaries + References No definition available. + Details
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- Definition Audit services paid to the auditors in respect of employee pension plans. + References No definition available. + Details
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- Definition Auditors' fees for tax compliance services. + References No definition available. + Details
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- Definition Auditors Remuneration For Auditing And Non Audit Services + References No definition available. + Details
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- Definition Total Fees paid as non audit fees to auditors for services. + References No definition available. + Details
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- Definition Auditors Remuneration For Non Audit Services In Connection With Bond Issues Or Capital Raising + References No definition available. + Details
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- Definition Auditors Remuneration [Line Items] + References No definition available. + Details
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- Details
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- Details
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