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Assets held for sale and discontinued operations - Additional information (Detail) - GBP (£)
£ in Millions
 6 Months Ended 12 Months Ended
Dec. 05, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Sep. 30, 2020
Disclosure of associates [line items]          
Goodwill impairment on classification as held for sale       £ (94.5)  
Net cash inflow from operating activities [1]   £ (401.9) £ (126.4) 1,850.5  
Net cash inflow/(outflow) from investing activities   (30.3) 61.0 1,759.6  
Net cash (outflow)/inflow from financing activities   175.1 (310.2) (2,922.0)  
Kantar [member]          
Disclosure of associates [line items]          
Net cash inflow from operating activities   26.8 135.2 322.9  
Net cash inflow/(outflow) from investing activities   1.1 26.5 53.2  
Net cash (outflow)/inflow from financing activities   0.9 £ 18.8 27.2  
Kantar Business [Member]          
Disclosure of associates [line items]          
Percentage of interest in associates 40.00%        
Disposal of discontinued operations consideration £ 2,140.2 200.1      
Gain (loss) on disposal of discontinued operations Before Tax   (3.3)   73.8  
Attributable tax expense   £ 1.9   157.4  
Goodwill impairment on classification as held for sale       £ (94.5)  
Kantar Business [Member] | Scenario forecast one [member] | Final stages [member]          
Disclosure of associates [line items]          
Disposal of discontinued operations consideration expected to be received for Final stages         £ 50.0
[1] Figures have been restated as described in the accounting policies.