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Financial Instruments - Analysis of Financial Assets and Liabilities (Details) - GBP (£)
£ in Millions
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
Bank overdrafts and bonds: amounts falling due within one year (946.3) (1,169.0)  
Bonds (3,775.0) (3,801.8)  
Payments due to vendors (earnout agreements) (198.7) (160.1)  
Liabilities in respect of put options (103.6) (342.1)  
Derivatives in designated hedge relationships | Classification under IFRS 9      
Disclosure of detailed information about financial instruments [line items]      
Derivative assets 31.7 0.6  
Derivative liabilities   (53.3)  
Financial instruments 31.7 (52.7)  
Held at fair value through profit or loss | Classification under IFRS 9      
Disclosure of detailed information about financial instruments [line items]      
Other investments 257.2 255.7  
Cash and short-term deposits 180.7 219.9  
Derivative assets 2.2 5.1  
Derivative liabilities (3.0) (4.7)  
Payments due to vendors (earnout agreements) (198.7) (160.1)  
Liabilities in respect of put options (103.6) (342.1)  
Financial instruments 238.4 315.9  
Held at fair value through other comprehensive income | Classification under IFRS 9      
Disclosure of detailed information about financial instruments [line items]      
Other investments 75.5 114.1  
Financial instruments 75.5 114.1  
Amortised cost | Classification under IFRS 9      
Disclosure of detailed information about financial instruments [line items]      
Cash and short-term deposits 2,036.8 2,271.6  
Bank overdrafts and bonds: amounts falling due within one year (946.3) (1,169.0)  
Bonds (3,775.0) (3,801.8)  
Trade and other receivables: amounts falling due within one year 10,601.4 11,338.0  
Trade and other receivables: amounts falling due after more than one year 118.3 146.2  
Trade and other payables: amounts falling due within one year (10,917.4) (11,283.0)  
Trade and other payables: amounts falling due after more than one year (1.5) (0.9)  
Financial instruments (2,987.3) (2,841.0)  
Carrying value | Classification under IFRS 9      
Disclosure of detailed information about financial instruments [line items]      
Other investments 332.7 369.8  
Cash and short-term deposits 2,217.5 2,491.5  
Bank overdrafts and bonds: amounts falling due within one year (946.3) (1,169.0)  
Bonds (3,775.0) (3,801.8)  
Trade and other receivables: amounts falling due within one year 10,601.4 11,338.0  
Trade and other receivables: amounts falling due after more than one year 118.3 146.2  
Trade and other payables: amounts falling due within one year (10,917.4) (11,283.0)  
Trade and other payables: amounts falling due after more than one year (1.5) (0.9)  
Derivative assets 33.9 5.7  
Derivative liabilities (3.0) (58.0)  
Payments due to vendors (earnout agreements) (198.7) (160.1)  
Liabilities in respect of put options (103.6) (342.1)  
Financial instruments £ (2,641.7) £ (2,463.7)