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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, 2018 GBP (£) | Jun. 30, 2018 USD ($) | Jun. 30, 2018 AUD ($) | Jun. 30, 2018 EUR (€)
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | £ 8,208.8 |  |  |
Drawn down facilities | 6,627.1 |  |  |
Undrawn committed credit facilities | 1,581.7 |  |  |
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 | £ 379.0 | $ 500 |  |
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 | £ 205.8 | $ 272 |  |
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 | £ 531.0 |  |  | € 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 | £ 663.8 |  |  | € 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 | £ 568.4 | $ 750 |  |
Interest rate | 3.75% | 3.75% | 3.75% | 3.75%
Euro bonds due November 2023 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | £ 663.8 |  |  | € 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 | £ 379.0 | $ 500 |  |
Interest rate | 3.625% | 3.625% | 3.625% | 3.625%
US$ bonds due November 2021 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | £ 615.7 | $ 812 |  |
Interest rate | 4.75% | 4.75% | 4.75% | 4.75%
US revolving credit facilities [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | £ 1,894.8 | $ 2,500 |  |
Sterling bonds due November 2020 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | £ 200.0 |  |  |
Interest rate | 6.375% | 6.375% | 6.375% | 6.375%
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 | £ 221.3 |  |  | € 250
Euro bonds due November 2019 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | £ 531.0 |  |  | € 600
Interest rate | 0.75% | 0.75% | 0.75% | 0.75%
Australian New Zealand revolving credit facilities [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | £ 291.4 |  | $ 520 |
Euro bonds due 2025 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | £ 442.5 |  |  | € 500
Interest rate | 1.375% | 1.375% | 1.375% | 1.375%
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 | £ 221.3 |  |  | € 250
Within one year [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | 531.0 |  |  |
Drawn down facilities | 531.0 |  |  |
Within one year [member] | Euro bonds due November 2019 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | 531.0 |  |  |
Between one and two years [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | 421.3 |  |  |
Drawn down facilities | 421.3 |  |  |
Between one and two years [member] | Sterling bonds due November 2020 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | 200.0 |  |  |
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 | 221.3 |  |  |
Between two and three years [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | 2,801.9 |  |  |
Drawn down facilities | 1,220.2 |  |  |
Between two and three years [member] | US$ bonds due November 2021 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | 615.7 |  |  |
Between two and three years [member] | US revolving credit facilities [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | 1,894.8 |  |  |
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 | 291.4 |  |  |
Between three and four years [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | 600.3 |  |  |
Drawn down facilities | 600.3 |  |  |
Between three and four years [member] | US$ bonds due September 2022 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | 379.0 |  |  |
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 | 221.3 |  |  |
Later than four years [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | 3,854.3 |  |  |
Drawn down facilities | 3,854.3 |  |  |
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 | 379.0 |  |  |
Later than four years [member] | US$ bonds due September 2042 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | 205.8 |  |  |
Later than four years [member] | Euro bonds due March 2030 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | 531.0 |  |  |
Later than four years [member] | Euro bonds due September 2026 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | 663.8 |  |  |
Later than four years [member] | US$ bonds due September 2024 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | 568.4 |  |  |
Later than four years [member] | Euro bonds due November 2023 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | 663.8 |  |  |
Later than four years [member] | Euro bonds due 2025 [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total committed facilities available | £ 442.5 |  |  |

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