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Going concern and risk management policies - Committed Facilities (Detail)
€ in Millions, £ in Millions, $ in Millions, $ in Millions
 6 Months Ended
Jun. 30, 2020
GBP (£)
Jun. 30, 2020
EUR (€)
Jun. 30, 2020
USD ($)
Jun. 30, 2020
AUD ($)
Disclosure of detailed information about borrowings [line items]        
Total committed facilities available £ 7,435.5      
Drawn down facilities 5,291.9      
Undrawn committed credit facilities 2,143.6      
Sterling bonds due September 2046 [member]        
Disclosure of detailed information about borrowings [line items]        
Total committed facilities available £ 400.0      
Interest rate 2.875% 2.875% 2.875% 2.875%
US$ bonds due November 2043 [member]        
Disclosure of detailed information about borrowings [line items]        
Total committed facilities available £ 177.6   $ 220  
Interest rate 5.625% 5.625% 5.625% 5.625%
US$ bonds due September 2042 [member]        
Disclosure of detailed information about borrowings [line items]        
Total committed facilities available £ 75.0   $ 93  
Interest rate 5.125% 5.125% 5.125% 5.125%
Sterling bonds due 2032 [member]        
Disclosure of detailed information about borrowings [line items]        
Total committed facilities available £ 250.0      
Interest rate 3.75% 3.75% 3.75% 3.75%
Euro bonds due March 2030 [member]        
Disclosure of detailed information about borrowings [line items]        
Total committed facilities available £ 545.0 € 600    
Interest rate 1.625% 1.625% 1.625% 1.625%
Euro bonds due 2027 [member]        
Disclosure of detailed information about borrowings [line items]        
Total committed facilities available £ 681.2 € 750    
Interest rate 2.375% 2.375% 2.375% 2.375%
Euro bonds due September 2026 [member]        
Disclosure of detailed information about borrowings [line items]        
Total committed facilities available £ 681.2 € 750    
Interest rate 2.25% 2.25% 2.25% 2.25%
Eurobonds Due September 2025 [Member]        
Disclosure of detailed information about borrowings [line items]        
Total committed facilities available £ 454.1 € 500    
Interest rate 1.375% 1.375% 1.375% 1.375%
US$ bonds due September 2024 [member]        
Disclosure of detailed information about borrowings [line items]        
Total committed facilities available £ 605.9   $ 750  
Interest rate 3.75% 3.75% 3.75% 3.75%
Bank revolver due 2024 [member]        
Disclosure of detailed information about borrowings [line items]        
Total committed facilities available £ 2,019.5   $ 2,500  
Euro bonds due November 2023 [member]        
Disclosure of detailed information about borrowings [line items]        
Total committed facilities available £ 681.2 € 750    
Interest rate 3.00% 3.00% 3.00% 3.00%
US$ bonds due September 2022 [member]        
Disclosure of detailed information about borrowings [line items]        
Total committed facilities available £ 403.9   $ 500  
Interest rate 3.625% 3.625% 3.625% 3.625%
Eurobonds (3m EURIBOR 0.45%) due March 2022 [Member]        
Disclosure of detailed information about borrowings [line items]        
Total committed facilities available | €   € 250    
Eurobonds (3m EURIBOR + 0.45%) due March 2022 [member]        
Disclosure of detailed information about borrowings [line items]        
Adjustment to floating basis 0.45% 0.45% 0.45% 0.45%
Floating basis 3m EURIBOR      
Total committed facilities available £ 227.1      
Bank revolver due 2021 [member]        
Disclosure of detailed information about borrowings [line items]        
Total committed facilities available 233.8     $ 420
Within one year [member]        
Disclosure of detailed information about borrowings [line items]        
Total committed facilities available 233.8      
Drawn down facilities 109.7      
Within one year [member] | Bank revolver due 2021 [member]        
Disclosure of detailed information about borrowings [line items]        
Total committed facilities available 233.8      
Between one and two years [member]        
Disclosure of detailed information about borrowings [line items]        
Total committed facilities available 631.0      
Drawn down facilities 631.0      
Between one and two years [member] | US$ bonds due September 2022 [member]        
Disclosure of detailed information about borrowings [line items]        
Total committed facilities available 403.9      
Between one and two years [member] | Eurobonds (3m EURIBOR + 0.45%) due March 2022 [member]        
Disclosure of detailed information about borrowings [line items]        
Total committed facilities available 227.1      
Between two and three years [member]        
Disclosure of detailed information about borrowings [line items]        
Total committed facilities available 681.2      
Drawn down facilities 681.2      
Between two and three years [member] | Euro bonds due November 2023 [member]        
Disclosure of detailed information about borrowings [line items]        
Total committed facilities available 681.2      
Between three and four years [member]        
Disclosure of detailed information about borrowings [line items]        
Total committed facilities available 2,625.4      
Drawn down facilities 605.9      
Between three and four years [member] | US$ bonds due September 2024 [member]        
Disclosure of detailed information about borrowings [line items]        
Total committed facilities available 605.9      
Between three and four years [member] | Bank revolver due 2024 [member]        
Disclosure of detailed information about borrowings [line items]        
Total committed facilities available 2,019.5      
Later than four years [member]        
Disclosure of detailed information about borrowings [line items]        
Total committed facilities available 3,264.1      
Drawn down facilities 3,264.1      
Later than four years [member] | Sterling bonds due September 2046 [member]        
Disclosure of detailed information about borrowings [line items]        
Total committed facilities available 400.0      
Later than four years [member] | US$ bonds due November 2043 [member]        
Disclosure of detailed information about borrowings [line items]        
Total committed facilities available 177.6      
Later than four years [member] | US$ bonds due September 2042 [member]        
Disclosure of detailed information about borrowings [line items]        
Total committed facilities available 75.0      
Later than four years [member] | Sterling bonds due 2032 [member]        
Disclosure of detailed information about borrowings [line items]        
Total committed facilities available 250.0      
Later than four years [member] | Euro bonds due March 2030 [member]        
Disclosure of detailed information about borrowings [line items]        
Total committed facilities available 545.0      
Later than four years [member] | Euro bonds due 2027 [member]        
Disclosure of detailed information about borrowings [line items]        
Total committed facilities available 681.2      
Later than four years [member] | Euro bonds due September 2026 [member]        
Disclosure of detailed information about borrowings [line items]        
Total committed facilities available 681.2      
Later than four years [member] | Eurobonds Due September 2025 [Member]        
Disclosure of detailed information about borrowings [line items]        
Total committed facilities available £ 454.1