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Risk management policies - Committed Facilities (Details)
€ in Millions, £ in Millions, $ in Millions
Dec. 31, 2023
USD ($)
Dec. 31, 2023
EUR (€)
Dec. 31, 2023
GBP (£)
Dec. 31, 2022
GBP (£)
Dec. 31, 2021
GBP (£)
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available     £ 6,352.7    
Drawn down facilities     4,389.0    
Undrawn committed credit facilities     1,963.7 £ 2,069.0 £ 1,847.5
£ bonds £400m (2.875% 2046)          
Disclosure of detailed information about borrowings [line items]          
Bond amount $ 400   £ 400.0    
Average interest rate 2.875% 2.875% 2.875%    
Total committed facilities available     £ 400.0    
US bond $220m (5.625% 2043)          
Disclosure of detailed information about borrowings [line items]          
Bond amount | $ $ 220        
Average interest rate 5.625% 5.625% 5.625%    
Total committed facilities available     £ 172.7    
US bond $93m (5.125% 2042)          
Disclosure of detailed information about borrowings [line items]          
Bond amount | $ $ 93        
Average interest rate 5.125% 5.125% 5.125%    
Total committed facilities available     £ 72.9    
£ bonds £250m (3.75% 2032)          
Disclosure of detailed information about borrowings [line items]          
Bond amount     £ 250.0    
Average interest rate 3.75% 3.75% 3.75%    
Total committed facilities available     £ 250.0    
Eurobonds €600m (1.625% 2030)          
Disclosure of detailed information about borrowings [line items]          
Bond amount | €   € 600      
Average interest rate 1.625% 1.625% 1.625%    
Total committed facilities available     £ 520.2    
Eurobonds €750m (4.125% 2028)          
Disclosure of detailed information about borrowings [line items]          
Bond amount | €   € 750      
Average interest rate 4.125% 4.125% 4.125%    
Total committed facilities available     £ 650.2    
Eurobonds €750m (2.375% 2027)          
Disclosure of detailed information about borrowings [line items]          
Bond amount     £ 750.0    
Average interest rate 2.375% 2.375% 2.375%    
Total committed facilities available     £ 650.2    
Eurobonds €750m (2.25% 2026)          
Disclosure of detailed information about borrowings [line items]          
Bond amount | €   € 750      
Average interest rate 2.25% 2.25% 2.25%    
Total committed facilities available     £ 650.2    
Bank revolver ($2,500m 2026)          
Disclosure of detailed information about borrowings [line items]          
Bond amount | $ $ 2,500        
Total committed facilities available     £ 1,963.7    
Eurobonds €500m (1.375% 2025)          
Disclosure of detailed information about borrowings [line items]          
Bond amount | €   € 500      
Average interest rate 1.375% 1.375% 1.375%    
Total committed facilities available     £ 433.5    
US bond $750m (3.75% 2024)          
Disclosure of detailed information about borrowings [line items]          
Bond amount | $ $ 750        
Average interest rate 3.75% 3.75% 3.75%    
Total committed facilities available     £ 589.1    
2024          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available     589.1    
Drawn down facilities     589.1    
2024 | US bond $750m (3.75% 2024)          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available     589.1    
2025          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available     433.5    
Drawn down facilities     433.5    
2025 | Eurobonds €500m (1.375% 2025)          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available     433.5    
2026          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available     2,613.9    
Drawn down facilities     650.2    
2026 | Eurobonds €750m (2.25% 2026)          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available     650.2    
2026 | Bank revolver ($2,500m 2026)          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available     1,963.7    
2027          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available     650.2    
Drawn down facilities     650.2    
2027 | Eurobonds €750m (2.375% 2027)          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available     650.2    
2028          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available     2,066.0    
Drawn down facilities     2,066.0    
2028 | £ bonds £400m (2.875% 2046)          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available     400.0    
2028 | US bond $220m (5.625% 2043)          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available     172.7    
2028 | US bond $93m (5.125% 2042)          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available     72.9    
2028 | £ bonds £250m (3.75% 2032)          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available     250.0    
2028 | Eurobonds €600m (1.625% 2030)          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available     520.2    
2028 | Eurobonds €750m (4.125% 2028)          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available     £ 650.2