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Financial instruments - Fair Value of assets and liabilities (Detail) - GBP (£)
£ in Millions
Jun. 30, 2022
Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items]    
Other investments £ 372.9 £ 318.3
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 19.2  
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 | 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 (64.2)  
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 (3.9)  
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 | Held at fair value through profit or loss    
Disclosure of detailed information about financial instruments [line items]    
Assets 2.2  
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 241.1  
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 112.2  
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 (173.1)  
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 (397.8)  
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