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Sources of finance - Analysis of Future Anticipated Cash Flows Related of Financial Derivatives (Details) - GBP (£)
£ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Financial liabilities, Payable      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Future anticipated cash flows, Financial liabilities £ 731.5 £ 1,186.3 £ 1,198.6
Future anticipated cash flows, Financial assets 1,543.9 808.5 611.1
Financial liabilities, Payable | Within one year      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Future anticipated cash flows, Financial liabilities 682.2 1,186.3 185.8
Future anticipated cash flows, Financial assets 335.3 347.1 581.1
Financial liabilities, Payable | Between one and two years      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Future anticipated cash flows, Financial liabilities 15.9 0.0 551.4
Future anticipated cash flows, Financial assets 487.4 11.6 30.0
Financial liabilities, Payable | Between two and three years      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Future anticipated cash flows, Financial liabilities 15.0 0.0 11.6
Future anticipated cash flows, Financial assets 37.5 449.8 0.0
Financial liabilities, Payable | Between three and four years      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Future anticipated cash flows, Financial liabilities 14.7   449.8
Future anticipated cash flows, Financial assets 37.1   0.0
Financial liabilities, Payable | Between four and five years      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Future anticipated cash flows, Financial liabilities 3.7    
Future anticipated cash flows, Financial assets 646.6    
Financial assets, Receivable      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Future anticipated cash flows, Financial liabilities 729.3 1,126.2 1,146.4
Future anticipated cash flows, Financial assets 1,569.9 813.7 612.9
Financial assets, Receivable | Within one year      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Future anticipated cash flows, Financial liabilities 681.3 1,126.2 173.7
Future anticipated cash flows, Financial assets 310.7 345.7 582.5
Financial assets, Receivable | Between one and two years      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Future anticipated cash flows, Financial liabilities 15.7 0.0 521.1
Future anticipated cash flows, Financial assets 479.6 6.2 30.4
Financial assets, Receivable | Between two and three years      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Future anticipated cash flows, Financial liabilities 14.6 0.0 6.0
Future anticipated cash flows, Financial assets 32.3 £ 461.8 0.0
Financial assets, Receivable | Between three and four years      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Future anticipated cash flows, Financial liabilities 14.2   445.6
Future anticipated cash flows, Financial assets 32.5   £ 0.0
Financial assets, Receivable | Between four and five years      
Disclosure of maturity analysis for derivative financial liabilities [line items]      
Future anticipated cash flows, Financial liabilities 3.5    
Future anticipated cash flows, Financial assets £ 714.8