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Our people - Additional Information (Detail) £ in Millions	12 Months Ended
	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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The average number of personnel employed by the entity during a period.

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