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Financial instruments - Analysis of Financial Instruments Measured at Fair Value (Detail) - GBP (£)
£ in Millions
 6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]        
Beginning balance £ 498.3      
Payments due to vendors (earnout agreements) (note 18) (166.6) £ (253.8) £ (371.5) £ (414.7)
Ending balance 398.0      
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] | Derivatives in designated hedge relationships [member] | Derivatives Liabilities [member]        
Disclosure of detailed information about financial instruments [line items]        
Derivative liabilities (0.6)      
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 (2.7)      
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 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 (226.8)      
Losses recognised in other comprehensive income 26.0      
Exchange adjustments (1.3)      
Additions (1.5)      
Settlements 7.2      
Ending balance (167.5)      
At Fair Value [member] | Level 3 [member] | Equity investments [member] | Other investments [member]        
Disclosure of detailed information about financial instruments [line items]        
Beginning balance 456.1      
Gains recognised in the income statement 1.7      
Losses recognised in other comprehensive income (88.7)      
Additions 3.0      
Disposals (2.5)      
Ending balance 369.6      
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) (166.6)      
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 (167.5)      
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 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 £ 110.9