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Assets held for sale and discontinued operations - Additional information (Detail) - GBP (£)
£ in Millions
 12 Months Ended
Feb. 27, 2020
Dec. 05, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement [LineItems]          
Goodwill impairment on classification as held for sale [1]     £ (94.5)    
Disposal of discontinued operations consideration expected to be received for remaining stages   £ 200.0      
Net cash inflow from operating activities     1,850.5 £ 1,693.8 £ 1,408.1
Net cash inflow/(outflow) from investing activities     1,759.6 184.5 (499.7)
Net cash (outflow)/inflow from financing activities     (2,922.0) (1,613.8) (785.6)
Kantar [member]          
Statement [LineItems]          
Net cash inflow from operating activities     322.9 292.5 378.4
Net cash inflow/(outflow) from investing activities     (53.2) (59.5) (67.8)
Net cash (outflow)/inflow from financing activities     (27.2) £ (7.9) £ (9.1)
Kantar second stage [member]          
Statement [LineItems]          
Proportion of the Kantar group included in the second stage of the transaction completed 4.00%        
Disposal of major subsidiary [member] | Kantar second stage [member]          
Statement [LineItems]          
Disposal group discontinued operation cash consideration received £ 136.7        
Kantar Business [Member]          
Statement [LineItems]          
Percentage of interest in associates   40.00%      
Proportion of the Kantar group included in the first stage of the transaction completed   90.00%      
Goodwill impairment on classification as held for sale     (94.5)    
Attributable tax expense     157.4    
Gain on disposal of discontinued operations Before Tax     £ 73.8    
Disposal of discontinued operations consideration   £ 2,140.2      
[1] Goodwill impairment of £94.5 million arose from the assessment of fair value less costs to sell under IFRS 5.