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Provision for post-employment benefits - Movement in Pension Plan Assets (Detail) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of net defined benefit (liability) asset      
Fair value of plan assets at beginning of year £ (184.3) £ (206.3)  
Employer contributions (37.1) (44.9) £ (68.2)
Administrative expenses (1.9) (2.2) [1] (2.4) [1]
Fair value of plan assets at end of year (159.0) (184.3) (206.3)
Plan assets [member]      
Disclosure of net defined benefit (liability) asset      
Fair value of plan assets at beginning of year 840.6 930.0 934.2
Interest income on plan assets 22.4 26.3 26.6
Return on plan assets (excluding interest income) 16.7 (43.9) 13.4
Employer contributions 37.1 44.9 68.2
Benefits paid [2] (140.8) (75.6) (79.7)
(Loss)/gain due to exchange rate movements (15.7) 23.0 (28.7)
Settlement payments [3] (47.4) (70.4) (1.2)
Administrative expenses (2.1) (3.4) (3.1)
Transfer to disposal group classified as held for sale (111.1)    
Other [4] 8.8 9.7 0.3
Fair value of plan assets at end of year 608.5 840.6 930.0
Actual return on plan assets £ 39.1 £ (17.6) £ 40.0
[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] In 2019, there was an amendment to a US defined benefit plan that allowed certain participants to receive immediate lump sum pay-outs, which totalled £69.7 million.
[3] In 2019 and 2018, the Group completed the transfer of the defined benefit obligations for certain UK plans to an insurer resulting in £47.1 million and £70.4 million, respectively, in settlement payments.
[4] Other includes acquisitions, disposals, plan participants’ contributions and reclassifications. The reclassifications represent certain of the Group’s defined benefit plans which are included in this note for the first time in the periods presented.