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Financial Instruments - Analysis of Financial Instruments Measured at Fair Value (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items]      
Other investments £ 332.7 £ 369.8 £ 318.3
Payments due to vendors (earnout agreements) (198.7) (160.1)  
Payments due to vendors (earnout agreements) | Level 3      
Disclosure of detailed information about financial instruments [line items]      
(Losses) gains recognised in other comprehensive income 0.0    
Disposals 0.0 0.0  
At Fair Value | Derivatives in designated hedge relationships | Derivative liabilities      
Disclosure of detailed information about financial instruments [line items]      
Derivative liabilities 0.0 (53.3)  
At Fair Value | Derivatives in designated hedge relationships | Derivative liabilities | Level 1      
Disclosure of detailed information about financial instruments [line items]      
Derivative liabilities 0.0 0.0  
At Fair Value | Derivatives in designated hedge relationships | Derivative liabilities | Level 2      
Disclosure of detailed information about financial instruments [line items]      
Derivative liabilities 0.0 (53.3)  
At Fair Value | Derivatives in designated hedge relationships | Derivative liabilities | Level 3      
Disclosure of detailed information about financial instruments [line items]      
Derivative liabilities 0.0 0.0  
At Fair Value | Derivatives in designated hedge relationships | Derivative assets      
Disclosure of detailed information about financial instruments [line items]      
Derivative assets 31.7 0.6  
At Fair Value | Derivatives in designated hedge relationships | Derivative assets | Level 1      
Disclosure of detailed information about financial instruments [line items]      
Derivative assets 0.0 0.0  
At Fair Value | Derivatives in designated hedge relationships | Derivative assets | Level 2      
Disclosure of detailed information about financial instruments [line items]      
Derivative assets 31.7 0.6  
At Fair Value | Derivatives in designated hedge relationships | Derivative assets | Level 3      
Disclosure of detailed information about financial instruments [line items]      
Derivative assets 0.0 0.0  
At Fair Value | Held at fair value through profit or loss | Derivative liabilities      
Disclosure of detailed information about financial instruments [line items]      
Derivative liabilities (3.0) (4.7)  
At Fair Value | Held at fair value through profit or loss | Derivative liabilities | Level 1      
Disclosure of detailed information about financial instruments [line items]      
Derivative liabilities 0.0 0.0  
At Fair Value | Held at fair value through profit or loss | Derivative liabilities | Level 2      
Disclosure of detailed information about financial instruments [line items]      
Derivative liabilities (3.0) (4.7)  
At Fair Value | Held at fair value through profit or loss | Derivative liabilities | Level 3      
Disclosure of detailed information about financial instruments [line items]      
Derivative liabilities 0.0 0.0  
At Fair Value | Held at fair value through profit or loss | Payments due to vendors (earnout agreements)      
Disclosure of detailed information about financial instruments [line items]      
Payments due to vendors (earnout agreements) (198.7) (160.1)  
At Fair Value | Held at fair value through profit or loss | Payments due to vendors (earnout agreements) | Level 1      
Disclosure of detailed information about financial instruments [line items]      
Payments due to vendors (earnout agreements) 0.0 0.0  
At Fair Value | Held at fair value through profit or loss | Payments due to vendors (earnout agreements) | Level 2      
Disclosure of detailed information about financial instruments [line items]      
Payments due to vendors (earnout agreements) 0.0 0.0  
At Fair Value | Held at fair value through profit or loss | Payments due to vendors (earnout agreements) | Level 3      
Disclosure of detailed information about financial instruments [line items]      
Payments due to vendors (earnout agreements) (198.7) (160.1)  
At Fair Value | Held at fair value through profit or loss | Derivative assets      
Disclosure of detailed information about financial instruments [line items]      
Derivative assets 2.2 5.1  
At Fair Value | Held at fair value through profit or loss | Derivative assets | Level 1      
Disclosure of detailed information about financial instruments [line items]      
Derivative assets 0.0 0.0  
At Fair Value | Held at fair value through profit or loss | Derivative assets | Level 2      
Disclosure of detailed information about financial instruments [line items]      
Derivative assets 2.2 5.1  
At Fair Value | Held at fair value through profit or loss | Derivative assets | Level 3      
Disclosure of detailed information about financial instruments [line items]      
Derivative assets 0.0 0.0  
At Fair Value | Held at fair value through profit or loss | Other investments      
Disclosure of detailed information about financial instruments [line items]      
Other investments 257.2 255.7  
At Fair Value | Held at fair value through profit or loss | Other investments | Level 1      
Disclosure of detailed information about financial instruments [line items]      
Other investments 0.6 0.4  
At Fair Value | Held at fair value through profit or loss | Other investments | Level 2      
Disclosure of detailed information about financial instruments [line items]      
Other investments 0.0 0.0  
At Fair Value | Held at fair value through profit or loss | Other investments | Level 3      
Disclosure of detailed information about financial instruments [line items]      
Other investments 256.6 255.3  
At Fair Value | Held at fair value through other comprehensive income | Other investments      
Disclosure of detailed information about financial instruments [line items]      
Other investments 75.5 114.1  
At Fair Value | Held at fair value through other comprehensive income | Other investments | Level 1      
Disclosure of detailed information about financial instruments [line items]      
Other investments 7.4 10.9  
At Fair Value | Held at fair value through other comprehensive income | Other investments | Level 2      
Disclosure of detailed information about financial instruments [line items]      
Other investments 0.0 0.0  
At Fair Value | Held at fair value through other comprehensive income | Other investments | Level 3      
Disclosure of detailed information about financial instruments [line items]      
Other investments 68.1 103.2  
At Fair Value | Payments due to vendors (earnout agreements) | Level 3      
Disclosure of detailed information about financial instruments [line items]      
Beginning balance (160.1) (196.7)  
Gains/(losses) recognised in the income statement 50.8 26.2  
(Losses) gains recognised in other comprehensive income   0.0  
Exchange adjustments 1.8 (14.3)  
Additions 149.7 46.7  
Cancellations   0.0  
Settlements 58.5 71.4  
Ending balance (198.7) (160.1)  
At Fair Value | Other investments | Other investments | Level 3      
Disclosure of detailed information about financial instruments [line items]      
Other investments 324.7 358.5 £ 290.0
Gains/(losses) recognised in the income statement (26.7) 23.1  
(Losses) gains recognised in other comprehensive income 0.7 (5.3)  
Exchange adjustments 0.0 0.0  
Additions 2.6 66.7  
Disposals (10.4) (16.0)  
Cancellations   0.0  
Settlements £ 0.0 £ 0.0