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Our people - Staffing Costs (Detail) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
 [1]
Dec. 31, 2017
 [1]
Disclosure of staff costs [Line Items]      
Wages and salaries £ 4,946.2 £ 4,828.0 £ 4,937.5
Cash-based incentive plans 227.6 233.0 196.5
Share-based incentive plans 66.0 78.3 98.3
Social security costs 591.7 579.0 580.8
Pension costs 169.7 160.9 161.3
Severance 42.6 30.0 36.8
Other staff costs [2] 1,046.8 1,041.4 1,053.9
Staffing costs £ 7,090.6 £ 6,950.6 £ 7,065.1
[1] Prior year figures have been re-presented in accordance with IFRS 5 Non-current Assets Held for Sale and Discontinued Operations, as described in the accounting policies.
[2] Freelance and temporary staff costs are included in other staff costs.