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Auditor's remuneration - Summary of Auditor's Remuneration Paid (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Auditor's remuneration [abstract] |  |  |  |
Audit of the Financial Statements |  | $ 3.7 | $ 3.0 | $ 3.0
Audit of subsidiaries |  | 3.4 | 3.3 | 3.2
Audit-related assurance services |  | 0.2 | 0.2 | 0.2
Other assurance services | [1] | 0.7 | 1.1 | 1.3
Other non-audit services not covered by the above |  | 0.0 | 0.1 | 0.1
Total expense related to remuneration |  | $ 8.0 | $ 7.7 | $ 7.8
[1] | In 2020, excluded fees of $0.2m which had not been incurred as at 31 December 2020.

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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 2021-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard -URIDate 2021-03-24 + Details
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- References No definition available. + 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 2021-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition Auditors remuneration for audit of subsidiary financial statements. + References No definition available. + Details
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- Definition Other assurance services comprise the aggregate fees for assurance and related services that are related to the performance of the audit or review of the financial statements and are not reported under total audit fees. + References No definition available. + Details
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- Definition Auditors remuneration for Assurance services not related to the audit. + References No definition available. + Details
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