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Risk management policies - Committed Facilities (Detail)
€ in Millions, £ in Millions, $ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2019
GBP (£)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
AUD ($)
Dec. 31, 2018
GBP (£)
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available £ 6,309.8        
Drawn down facilities 4,304.2        
Undrawn committed credit facilities 2,005.6       £ 2,074.7
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 £ 165.8 $ 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 £ 70.0 $ 93      
Interest rate 5.125% 5.125% 5.125% 5.125%  
Euro bonds due March 2030 [member]          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available £ 507.9   € 600    
Interest rate 1.625% 1.625% 1.625% 1.625%  
Euro bonds due September 2026 [member]          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available £ 634.9   € 750    
Interest rate 2.25% 2.25% 2.25% 2.25%  
US$ bonds due September 2024 [member]          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available £ 565.5 $ 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 £ 1,884.9 $ 2,500      
Euro bonds due November 2023 [member]          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available £ 634.9   € 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 £ 377.0 $ 500      
Interest rate 3.625% 3.625% 3.625% 3.625%  
Eurobonds (3m EURIBOR + 0.32%) due May 2020 [member]          
Disclosure of detailed information about borrowings [line items]          
Adjustment to floating basis 0.32% 0.32% 0.32% 0.32%  
Floating basis 3m EURIBOR        
Total committed facilities available £ 211.6   € 250    
Australian New Zealand revolving credit facilities [member]          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available 222.4        
Euro bonds due 2025 [member]          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available £ 423.3   € 500    
Interest rate 1.375% 1.375% 1.375% 1.375%  
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 £ 211.6   € 250    
Australian revolving credit facilities due 2020 [member]          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available | $       $ 150  
Australian revolving credit facilities due 2021 [member]          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available | $       $ 270  
Within one year [member]          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available 291.0        
Drawn down facilities 216.9        
Within one year [member] | Eurobonds (3m EURIBOR + 0.32%) due May 2020 [member]          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available 211.6        
Within one year [member] | Australian New Zealand revolving credit facilities [member]          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available 79.4        
Between one and two years [member]          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available 143.0        
Drawn down facilities 96.4        
Between one and two years [member] | Australian New Zealand revolving credit facilities [member]          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available 143.0        
Between two and three years [member]          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available 588.6        
Drawn down facilities 588.6        
Between two and three years [member] | US$ bonds due September 2022 [member]          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available 377.0        
Between two and three years [member] | Eurobonds (3m EURIBOR 0.45%) due March 2022 [Member]          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available 211.6   € 250    
Between three and four years [member]          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available 634.9        
Drawn down facilities 634.9        
Between three and four years [member] | Euro bonds due November 2023 [member]          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available 634.9        
Later than four years [member]          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available 4,652.3        
Drawn down facilities 2,767.4        
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 165.8        
Later than four years [member] | US$ bonds due September 2042 [member]          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available 70.0        
Later than four years [member] | Euro bonds due March 2030 [member]          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available 507.9        
Later than four years [member] | Euro bonds due September 2026 [member]          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available 634.9        
Later than four years [member] | US$ bonds due September 2024 [member]          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available 565.5        
Later than four years [member] | Bank revolver due 2024 [member]          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available 1,884.9        
Later than four years [member] | Euro bonds due 2025 [member]          
Disclosure of detailed information about borrowings [line items]          
Total committed facilities available £ 423.3