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Finance and investment income, finance costs and revaluation and retranslation of financial instruments - Additional Information (Detail) € in Millions, £ in Millions, $ in Millions, $ in Millions | Dec. 31, 2019 GBP (£) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 EUR (€) | Dec. 31, 2019 AUD ($) | Dec. 31, 2018 GBP (£) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 AUD ($)
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Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |
Borrowings | £ | £ 4,272.9 |  |  |  | £ 6,217.9 |  |
US revolving credit facilities [member] | Weighted average [member] |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |
Borrowings |  | $ 72 |  |  |  | $ 125 |
Average interest rate | 1.11% | 1.11% | 1.11% | 1.11% | 0.96% | 0.96% | 0.96%
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] |  |  |  |  |  |  |
Borrowings |  | $ 41 |  |  |  | $ 540 |
Average interest rate | 2.46% | 2.46% | 2.46% | 2.46% | 2.28% | 2.28% | 2.28%
Australian New Zealand revolving credit facilities [member] | Weighted average [member] |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |
Borrowings |  |  |  | $ 310 |  |  | $ 439
Average interest rate | 2.95% | 2.95% | 2.95% | 2.95% | 3.27% | 3.27% | 3.27%
Euro Commercial Paper Programme [Member] | Weighted average [member] |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |
Borrowings | £ | £ 255.0 |  |  |  |  |  |
Average interest rate | 1.16% | 1.16% | 1.16% | 1.16% | 0.00% | 0.00% | 0.00%
US Dollar bonds [member] |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |
Borrowings |  | $ 1,563 |  |  |  |  |
Average interest rate | 4.06% | 4.06% | 4.06% | 4.06% |  |  |
Eurobonds [member] |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |
Borrowings | € |  |  | € 3,100 |  |  |  |
Average interest rate | 1.82% | 1.82% | 1.82% | 1.82% |  |  |
Sterling bonds [member] |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |
Borrowings | £ | £ 400.0 |  |  |  |  |  |
Average interest rate | 2.88% | 2.88% | 2.88% | 2.88% |  |  |

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