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Sources of finance - Additional Information (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 (£) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 GBP (£) | Dec. 31, 2016 GBP (£)
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Total equity | £ | £ 8,443.5 |  |  |  | £ 9,806.6 |  | £ 9,956.1 | £ 9,761.7
Total committed facilities available | £ | 6,309.8 |  |  |  |  |  |  |
Undrawn committed credit facility | £ | 2,005.6 |  |  |  | 2,074.7 |  |  |
Borrowings | £ | 4,272.9 |  |  |  | 6,217.9 |  |  |
Issued capital and share premium [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Total equity | £ | 703.1 |  |  |  | £ 703.0 |  | £ 701.8 |
US$ bonds due September 2022 [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Total committed facilities available | £ 377.0 | $ 500 |  |  |  |  |  |
Bonds interest rate | 3.625% | 3.625% | 3.625% | 3.625% |  |  |  |
US$ bonds due September 2024 [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Total committed facilities available | £ 565.5 | $ 750 |  |  |  |  |  |
Bonds interest rate | 3.75% | 3.75% | 3.75% | 3.75% |  |  |  |
US$ bonds due September 2042 [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Total committed facilities available | £ 70.0 | $ 93 |  |  |  |  |  |
Bonds interest rate | 5.125% | 5.125% | 5.125% | 5.125% |  |  |  |
US$ bonds due November 2043 [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Total committed facilities available | £ 165.8 | $ 220 |  |  |  |  |  |
Bonds interest rate | 5.625% | 5.625% | 5.625% | 5.625% |  |  |  |
Eurobonds (3m EURIBOR + 0.32%) due May 2020 [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Total committed facilities available | £ 211.6 |  | € 250 |  |  |  |  |
Floating basis | 3m EURIBOR |  |  |  |  |  |  |
Adjustment to floating basis | 0.32% | 0.32% | 0.32% | 0.32% |  |  |  |
Euro bonds due November 2023 [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Total committed facilities available | £ 634.9 |  | € 750 |  |  |  |  |
Bonds interest rate | 3.00% | 3.00% | 3.00% | 3.00% |  |  |  |
Euro bonds due September 2026 [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Total committed facilities available | £ 634.9 |  | € 750 |  |  |  |  |
Bonds interest rate | 2.25% | 2.25% | 2.25% | 2.25% |  |  |  |
Euro bonds due March 2030 [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Total committed facilities available | £ 507.9 |  | € 600 |  |  |  |  |
Bonds interest rate | 1.625% | 1.625% | 1.625% | 1.625% |  |  |  |
Eurobonds Due March 2025 [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Total committed facilities available | £ 423.3 |  | € 500 |  |  |  |  |
Bonds interest rate | 1.375% | 1.375% | 1.375% | 1.375% |  |  |  |
Eurobonds Due March 2022 [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Total committed facilities available | £ 211.6 |  | € 250 |  |  |  |  |
Floating basis | 3m EURIBOR |  |  |  |  |  |  |
Adjustment to floating basis | 0.45% | 0.45% | 0.45% | 0.45% |  |  |  |
Sterling bonds due September 2046 [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Total committed facilities available | £ | £ 400.0 |  |  |  |  |  |  |
Bonds interest rate | 2.875% | 2.875% | 2.875% | 2.875% |  |  |  |
US revolving credit facilities [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Total committed facilities available |  | $ 2,500 |  |  |  |  |  |
US revolving credit facilities [member] | Weighted average [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Bonds interest rate | 1.11% | 1.11% | 1.11% | 1.11% | 0.96% | 0.96% |  |
Borrowings |  | $ 72 |  |  |  | $ 125 |  |
US revolving credit facilities [member] | Weighted average [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Borrowings averaged equivalent |  |  |  |  |  | $ 72 |  |
Australian revolving credit facilities due 2019 (prior to extension) [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Total committed facilities available |  |  |  | $ 150 |  |  |  |
Australian revolving credit facilities due 2020 (after extension) [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Total committed facilities available |  |  |  | 150 |  |  |  |
Australian revolving credit facilities due 2021 (after reduction in December 2019) [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Total committed facilities available |  |  |  | 270 |  |  |  |
Australian revolving credit facilities due 2021 (before reduction in December 2019) [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Total committed facilities available |  |  |  | 370 |  |  |  |
Australian New Zealand revolving credit facilities [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Borrowings averaged equivalent |  |  |  | $ 310 |  |  |  |
US revolving credit facilities march 2024 (prior to extension) [member] | Borrowings and financing [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Total committed facilities available |  | 2,500 |  |  |  |  |  |
US commercial paper [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Borrowings |  | $ 0 |  |  |  |  |  |
US commercial paper [member] | Weighted average [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Bonds interest rate | 2.46% | 2.46% | 2.46% | 2.46% | 2.28% | 2.28% |  |
Borrowings |  | $ 41 |  |  |  | $ 540 |  |
Euro commercial paper [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Borrowings | € |  |  | € 0 |  |  |  |  |
Euro commercial paper [Member] | Weighted average [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Borrowings | £ | £ 255.0 |  |  |  | £ 0.0 |  |  |

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