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Cash and cash equivalents and debt financing - Cash reconciliation (Detail) - GBP (£)
£ in Millions
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Cash and cash equivalents and debt financing [Abstract]        
Cash at bank and in hand £ 1,682.8 £ 2,271.6    
Short-term bank deposits 279.8 219.9    
Overdrafts (447.5) (505.7)    
Cash and cash equivalents £ 1,515.1 £ 1,985.8 £ 1,489.3 £ 3,540.6