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Financial instruments - Fair Value of assets and liabilities (Detail) - GBP (£)
£ in Millions
Jun. 30, 2023
Dec. 31, 2022
Disclosure of detailed information about financial instruments [line items]    
Other investments £ 332.9 £ 369.8
Recurring fair value measurement | Level 1 | Held at fair value through profit or loss    
Disclosure of detailed information about financial instruments [line items]    
Other investments 0.4  
Recurring fair value measurement | Level 1 | Held at fair value through other comprehensive income    
Disclosure of detailed information about financial instruments [line items]    
Other investments 7.2  
Recurring fair value measurement | Level 1 | Derivatives    
Disclosure of detailed information about financial instruments [line items]    
Liabilities 0.0  
Recurring fair value measurement | Level 1 | Derivatives | Held at fair value through profit or loss    
Disclosure of detailed information about financial instruments [line items]    
Liabilities 0.0  
Recurring fair value measurement | Level 1 | Payments due to vendors (earnout agreements) | Held at fair value through profit or loss    
Disclosure of detailed information about financial instruments [line items]    
Liabilities 0.0  
Recurring fair value measurement | Level 1 | Liabilities in respect of put options | Held at fair value through profit or loss    
Disclosure of detailed information about financial instruments [line items]    
Liabilities 0.0  
Recurring fair value measurement | Level 1 | Derivatives    
Disclosure of detailed information about financial instruments [line items]    
Assets 0.0  
Recurring fair value measurement | Level 1 | Derivatives | Held at fair value through profit or loss    
Disclosure of detailed information about financial instruments [line items]    
Assets 0.0  
Recurring fair value measurement | Level 2 | Held at fair value through profit or loss    
Disclosure of detailed information about financial instruments [line items]    
Other investments 0.0  
Recurring fair value measurement | Level 2 | Held at fair value through other comprehensive income    
Disclosure of detailed information about financial instruments [line items]    
Other investments 0.0  
Recurring fair value measurement | Level 2 | Derivatives    
Disclosure of detailed information about financial instruments [line items]    
Liabilities (51.0)  
Recurring fair value measurement | Level 2 | Derivatives | Held at fair value through profit or loss    
Disclosure of detailed information about financial instruments [line items]    
Liabilities (1.8)  
Recurring fair value measurement | Level 2 | Payments due to vendors (earnout agreements) | Held at fair value through profit or loss    
Disclosure of detailed information about financial instruments [line items]    
Liabilities 0.0  
Recurring fair value measurement | Level 2 | Liabilities in respect of put options | Held at fair value through profit or loss    
Disclosure of detailed information about financial instruments [line items]    
Liabilities 0.0  
Recurring fair value measurement | Level 2 | Derivatives    
Disclosure of detailed information about financial instruments [line items]    
Assets 14.8  
Recurring fair value measurement | Level 2 | Derivatives | Held at fair value through profit or loss    
Disclosure of detailed information about financial instruments [line items]    
Assets 2.9  
Recurring fair value measurement | Level 3 | Held at fair value through profit or loss    
Disclosure of detailed information about financial instruments [line items]    
Other investments 257.5  
Recurring fair value measurement | Level 3 | Held at fair value through other comprehensive income    
Disclosure of detailed information about financial instruments [line items]    
Other investments 67.8  
Recurring fair value measurement | Level 3 | Derivatives    
Disclosure of detailed information about financial instruments [line items]    
Liabilities 0.0  
Recurring fair value measurement | Level 3 | Derivatives | Held at fair value through profit or loss    
Disclosure of detailed information about financial instruments [line items]    
Liabilities 0.0  
Recurring fair value measurement | Level 3 | Payments due to vendors (earnout agreements) | Held at fair value through profit or loss    
Disclosure of detailed information about financial instruments [line items]    
Liabilities (187.9)  
Recurring fair value measurement | Level 3 | Liabilities in respect of put options | Held at fair value through profit or loss    
Disclosure of detailed information about financial instruments [line items]    
Liabilities (320.8)  
Recurring fair value measurement | Level 3 | Derivatives    
Disclosure of detailed information about financial instruments [line items]    
Assets 0.0  
Recurring fair value measurement | Level 3 | Derivatives | Held at fair value through profit or loss    
Disclosure of detailed information about financial instruments [line items]    
Assets £ 0.0