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Analysis of cash flows - Repayment of borrowings (Detail)
£ in Millions
6 Months Ended
Jun. 30, 2023
GBP (£)
Jun. 30, 2022
GBP (£)
Jun. 30, 2023
EUR (€)
Analysis of cash flows [Abstract]      
Repayment of bank loans £ 0.0 £ (11.3)  
Repayment of revolving credit facility (400.0) 0.0  
Repayment of debt assumed on acquisition (69.8) 0.0  
Repayment of €250 million bonds 0.0 (209.3)  
Repayment of borrowings £ (469.8) £ (220.6)  
Repayment of €250 million bonds      
Disclosure of detailed information about borrowings [line items]      
Bond amount | €     € 250,000,000