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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 |  |  |  |

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