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Financial instruments - Analysis of Financial Instruments Measured at Fair Value (Detail) - GBP (£)
£ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]        
Beginning balance [1],[2] £ 498.3      
Payments due to vendors (earnout agreements) (note 18) [3] (153.3) £ (352.0) £ (243.7) £ (400.8)
Ending balance [1],[2] 398.0 £ 574.7 498.3  
At Fair Value [member] | Level 1 [member] | Held at fair value through other comprehensive income [member] | Other investments [member]        
Disclosure of detailed information about financial instruments [line items]        
Ending balance 28.4      
At Fair Value [member] | Level 2 [member] | Held at fair value through profit or loss [member] | Derivatives Liabilities [member]        
Disclosure of detailed information about financial instruments [line items]        
Derivative liabilities [2] (3.3)      
At Fair Value [member] | Level 2 [member] | Held at fair value through profit or loss [member] | Derivatives Assets [member]        
Disclosure of detailed information about financial instruments [line items]        
Derivative assets [2] 0.6      
At Fair Value [member] | Level 3 [member] | Held for trading [member] | Liabilities in Respect of Put Options [member]        
Disclosure of detailed information about financial instruments [line items]        
Beginning balance [3] (204.5)      
Losses recognised in other comprehensive income [3] 25.4      
Exchange adjustments [3] (1.1)      
Additions [3] (1.3)      
Cancellations [2] 28.9      
Settlements [3] 7.2      
Ending balance [3] (145.4)   (204.5)  
At Fair Value [member] | Level 3 [member] | Equity investments [member] | Other investments [member]        
Disclosure of detailed information about financial instruments [line items]        
Beginning balance [2] 456.1      
Gains recognised in the income statement [2] 1.7      
Losses recognised in other comprehensive income [2] (88.7)      
Additions [2] 3.0      
Disposals [2] (2.5)      
Ending balance 369.6   456.1 [2]  
At Fair Value [member] | Level 3 [member] | Held at fair value through profit or loss [member] | Trade And Other Payables To Trade Suppliers [member]        
Disclosure of detailed information about financial instruments [line items]        
Payments due to vendors (earnout agreements) (note 18) [2] (153.3)      
At Fair Value [member] | Level 3 [member] | Held at fair value through profit or loss [member] | Liabilities in Respect of Put Options [member]        
Disclosure of detailed information about financial instruments [line items]        
Liabilities in respect of put options [2] (145.4)      
At Fair Value [member] | Level 3 [member] | Held at fair value through profit or loss [member] | Other investments [member]        
Disclosure of detailed information about financial instruments [line items]        
Beginning balance [2] 258.7      
Ending balance [2]     £ 258.7  
At Fair Value [member] | Level 3 [member] | Held at fair value through other comprehensive income [member] | Other investments [member]        
Disclosure of detailed information about financial instruments [line items]        
Ending balance [2] £ 110.9      
[1] Figures have been restated to be in accordance with IAS 32 Financial Instruments: Presentation, as described in the accounting policies.
[2] Figures have been restated to be in accordance with IAS 39 Financial Instruments: Recognition and Measurement, as described in the accounting policies.
[3] Figures have been restated to be in accordance with IAS 39 Financial Instruments: Recognition and Measurement, as described in the accounting policies