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Interests in associates, joint ventures and other investments - Movements in Associates, Joint Ventures and Other Investments (Detail) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Movements in interests in associates and joint ventures    
Beginning balance [1] £ 796.8 £ 1,065.2
Additions 236.6 16.7
Share of results of associates undertakings 21.2 43.5
Dividends (33.3) (49.7)
Other movements 1.2 1.2
Reclassification from other investments to associates   0.3
Exchange adjustments (35.5) 12.9
Disposals (51.5) (304.0)
Reclassification to subsidiaries (0.3) 16.9
Amortisation of other intangible assets (5.6) (4.2)
Transfer to disposal group classified as held for sale (109.1)  
Write-downs (7.5) (2.0)
Ending balance [1] 813.0 796.8
Movements in interests in other investments    
Beginning balance [1] 666.7 1,153.5
Additions 18.3 35.0
Reclassification from other investments to associates   (0.3)
Disposals (42.3) (341.7)
Revaluation of other investments through profit or loss 9.1 68.1
Revaluation of other investments through other comprehensive income (141.4) (247.9)
Transfer to disposal group classified as held for sale (12.1)  
Ending balance [1] £ 498.3 £ 666.7
[1] Figures have been restated, as described in the accounting policies.