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Our people - Additional Information (Detail) £ in Millions | 12 Months Ended
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Dec. 31, 2019 GBP (£) Employees | Dec. 31, 2018 GBP (£) Employees | Dec. 31, 2017 GBP (£) Employees
Disclosure of our people [line items] |  |  |
Average number of staff | Employees | 132,823 | 133,903 | 134,428
Staff numbers at the end of period | Employees | 106,786 | 134,281 | 134,413
Share-based incentive plans in respect of key management personnel | £ 2.0 | £ 2.0 | £ 12.3
Total compensation received by key management personnel | £ 4.7 | 6.2 | 17.8
Compensation received by key management personnel in the form of pension contributions |  | £ 0.4 | £ 0.7
Leadership Equity Acquisition Plan III [member] |  |  |
Disclosure of our people [line items] |  |  |
LEAP awards vesting performance period | 5 years | 5 years | 5 years

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- Definition The amount of compensation to key management personnel. [Refer: Key management personnel of entity or parent [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2019-01-01 -Paragraph 17 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2019-en-r&anchor=para_17&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of compensation to key management personnel in the form of post-employment benefits. [Refer: Key management personnel of entity or parent [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2019-01-01 -Paragraph 17 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2019-en-r&anchor=para_17_b&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of compensation to key management personnel in the form of share-based payments. [Refer: Key management personnel of entity or parent [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2019-01-01 -Paragraph 17 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2019-en-r&anchor=para_17_e&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The number of personnel employed by the entity at a date. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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- Details
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