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Provision for post-employment benefits - Pension Costs (Detail) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
 [1]
Dec. 31, 2017
 [1]
Disclosure Of Pension Costs [abstract]      
Defined contribution plans £ 154.9 £ 146.7 £ 149.5
Defined benefit plans charge to operating profit 14.8 14.2 11.8
Pension costs (note 5) 169.7 160.9 161.3
Net interest expense on pension plans (note 6) 3.5 3.6 5.4
Pension costs, Net £ 173.2 £ 164.5 £ 166.7
[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.