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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 USD ($) | Jun. 30, 2020 EUR (€) | Jun. 30, 2020 AUD ($)
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 |  |  |

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