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Costs of services and general and administrative costs - Additional Information (Detail) - GBP (£)
£ in Millions
 1 Months Ended 6 Months Ended
May 31, 2022
Jun. 30, 2022
Jun. 30, 2021
Disclosure Of Information About Operating Cost [line items]      
Restructuring and transformation costs in relation to the continuing restructuring plan   £ 75.3 £ 34.3
Capitalised costs     46.3
Transformation costs   15.8  
Restructuring costs in relation to COVID-19   5.9 19.7
Net losses on disposals of investments   48.1  
Losses on disposals of investments £ 65.1    
Gain in relation to the reclassification to other investments   60.4  
Litigation settlement provision     £ 21.7
Investor Day      
Disclosure Of Information About Operating Cost [line items]      
Restructuring and transformation costs in relation to the continuing restructuring plan   £ 59.5