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Our people - Staffing Costs (Detail) - GBP (£) £ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Classes of employee benefits expense [abstract]
Wages and salaries	£ 5,710.0	£ 5,832.3		£ 5,395.6
Cash-based incentive plans	240.7	219.2		260.2
Share-based incentive plans (note 21)	84.8	105.0		106.5
Social security costs	717.5	720.3		658.1
Pension costs (note 22)	191.2	192.0		178.1
Severance	37.5	39.5		34.5
Other staff costs	1,190.9	1,210.7		1,151.9
Staffing costs	£ 8,172.6	£ 8,319.0	[1]	£ 7,784.9	[1]
[1] Prior year figures have been restated for the impact of the adoption of IFRS 15 Revenue from Contracts with Customers, as described in the accounting policies.

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The expense of all forms of consideration given by an entity in exchange for a service rendered by employees or for the termination of employment.

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The amount of expense from share-based payment transactions with employees.

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The amount of employee expenses that the entity does not separately disclose in the same statement or note.

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A class of employee benefits expense that represents social security contributions. [Refer: Employee benefits expense]

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The amount of expense in relation to termination benefits. Termination benefits are employee benefits provided in exchange for the termination of an employee's employment as a result of either: (a) an entity's decision to terminate an employee's employment before the normal retirement date; or (b) an employee's decision to accept an offer of benefits in exchange for the termination of employment. [Refer: Employee benefits expense]

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