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Risk management policies - Additional Information (Detail) € in Millions, £ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 GBP (£) | Dec. 31, 2018 GBP (£) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 EUR (€) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 EUR (€)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings | £ 4,272.9 | £ 6,217.9 |  |  |  |
Total committed facilities available | £ 6,309.8 |  |  |  |  |
Borrowings average maturity term | 8 years 2 months 12 days |  |  |  |  |
Eurobonds (3m EURIBOR + 0.32%) due May 2020 [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Total committed facilities available | £ 211.6 |  |  | € 250 |  |
Borrowings Maturity Term | 2 years |  |  |  |  |
Interest rate risk [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Percentage increase in market interest rate | 1.00% | 1.00% |  |  |  |
Potential amount of change due to an increase or decrease in risk | £ 22.6 | £ 7.2 |  |  |  |
Percentage decrease in market interest rate | 1.00% | 1.00% |  |  |  |
US dollar borrowings [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings | $ |  |  | $ 1,563 |  | $ 2,784 |
US dollar borrowings [member] | Weighted average [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings | $ |  |  | $ 2,509 |  | $ 3,377 |
US dollar borrowings [member] | Fixed interest rate [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Percentage of debt | 100.00% |  |  |  |  |
Borrowings interest rate | 4.06% |  | 4.06% | 4.06% |  |
Average period of debt | 95 months |  |  |  |  |
Sterling Borrowings [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings | £ 844.0 | £ 1,044.0 |  |  |  |
Sterling Borrowings [member] | Weighted average [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings | £ 947.0 | £ 1,039.0 |  |  |  |
Sterling Borrowings [member] | Fixed interest rate [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Percentage of debt | 100.00% |  |  |  |  |
Borrowings interest rate | 2.73% |  | 2.73% | 2.73% |  |
Average period of debt | 188 months |  |  |  |  |
Sterling Borrowings [member] | Currency risk [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Percentage weakening of sterling against major currencies | 10.00% |  | 10.00% | 10.00% |  |
Percentage increase of sterling against major currencies | 10.00% |  | 10.00% | 10.00% |  |
Euro Borrowings [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings | € |  |  |  | € 2,600 |  | € 3,200
Euro Borrowings [member] | Weighted average [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings | € |  |  |  | € 3,128 |  | € 3,202
Euro Borrowings [member] | Fixed interest rate [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Percentage of debt | 80.80% |  |  |  |  |
Borrowings interest rate | 2.34% |  | 2.34% | 2.34% |  |
Average period of debt | 82 months |  |  |  |  |
Euro Borrowings [member] | Floating interest rate [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Percentage of debt | 19.20% |  |  |  |  |
Borrowings interest rate | 0.06% |  | 0.06% | 0.06% |  |
Average period of debt | 16 months |  |  |  |  |

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