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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, 2019 GBP (£) | Jun. 30, 2019 USD ($) | Jun. 30, 2019 EUR (€) | Jun. 30, 2019 AUD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | £ 7,838.2 |  |  |
Drawn down facilities | 6,152.4 |  |  |
Undrawn committed credit facilities | 1,685.8 |  |  |
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 | £ 173.2 | $ 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 | £ 73.1 | $ 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 | £ 536.9 |  | € 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 | £ 671.1 |  | € 750 |
Interest rate | 2.25% | 2.25% | 2.25% | 2.25%
Euro bonds due 2025 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | £ 447.4 |  | € 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 | £ 590.8 | $ 750 |  |
Interest rate | 3.75% | 3.75% | 3.75% | 3.75%
US revolving credit facilities [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | £ 1,969.3 | $ 2,500 |  |
Euro bonds due November 2023 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | £ 671.1 |  | € 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 | £ 393.9 | $ 500 |  |
Interest rate | 3.625% | 3.625% | 3.625% | 3.625%
Eurobonds (3m EURIBOR + 0.45%) due 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 | £ 223.7 |  | € 250 |
US$ bonds due November 2021 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | £ 639.9 | $ 812 |  |
Interest rate | 4.75% | 4.75% | 4.75% | 4.75%
Australian New Zealand revolving credit facilities [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | £ 287.2 |  |  |
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 | $ |  |  |  | $ 370
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 | £ 223.7 |  | € 250 |
Euro bonds due November 2019 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | £ 536.9 |  | € 600 |
Interest rate | 0.75% | 0.75% | 0.75% | 0.75%
Within one year [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | £ 536.9 |  |  |
Drawn down facilities | 536.9 |  |  |
Within one year [member] | Euro bonds due November 2019 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | 536.9 |  |  |
Between one and two years [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | 306.5 |  |  |
Drawn down facilities | 253.0 |  |  |
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 | 82.8 |  |  |
Between one and two years [member] | Eurobonds (3m EURIBOR + 0.32%) due May 2020 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | 223.7 |  |  |
Between two and three years [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | 844.3 |  |  |
Drawn down facilities | 823.2 |  |  |
Between two and three years [member] | US$ bonds due November 2021 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | 639.9 |  |  |
Between two and three years [member] | Australian New Zealand revolving credit facilities [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | 204.4 |  |  |
Between three and four years [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | 617.6 |  |  |
Drawn down facilities | 617.6 |  |  |
Between three and four years [member] | US$ bonds due September 2022 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | 393.9 |  |  |
Between three and four years [member] | Eurobonds (3m EURIBOR + 0.45%) due 2022 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | 223.7 |  |  |
Later than four years [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | 5,532.9 |  |  |
Drawn down facilities | 3,921.7 |  |  |
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 | 173.2 |  |  |
Later than four years [member] | US$ bonds due September 2042 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | 73.1 |  |  |
Later than four years [member] | Euro bonds due March 2030 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | 536.9 |  |  |
Later than four years [member] | Euro bonds due September 2026 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | 671.1 |  |  |
Later than four years [member] | Euro bonds due 2025 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | 447.4 |  |  |
Later than four years [member] | US$ bonds due September 2024 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | 590.8 |  |  |
Later than four years [member] | US revolving credit facilities [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | £ 1,969.3 |  |  |

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