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Sources of finance - Analysis of Fixed and Floating Rate Debt by Currency (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 (€)
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Borrowings |  | £ 4,272.9 | £ 6,217.9 |  |
US Dollar bonds [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Borrowings | $ |  |  |  | $ 1,563 |
US Dollar bonds [member] | Fixed interest rate [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Borrowings |  | £ 1,178.2 | £ 1,154.8 |  |
Fixed rate | [1] | 4.06% | 4.58% | 4.06% | 4.06%
Period (months) | [1] | 95 months | 181 months |  |
US Dollar bonds [member] | Floating interest rate [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Borrowings |  |  | £ 1,029.6 |  |
Floating basis |  |  | LIBOR |  |
Sterling bonds [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Borrowings |  | £ 400.0 |  |  |
Sterling bonds [member] | Fixed interest rate [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Borrowings |  | £ 844.1 | £ 1,044.1 |  |
Fixed rate | [1] | 2.73% | 3.43% | 2.73% | 2.73%
Period (months) | [1] | 188 months | 232 months |  |
Eurobonds [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Borrowings | € |  |  |  |  | € 3,100
Eurobonds [member] | Fixed interest rate [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Borrowings |  | £ 1,777.7 | £ 2,425.9 |  |
Fixed rate | [1] | 2.34% | 1.99% | 2.34% | 2.34%
Period (months) | [1] | 82 months | 75 months |  |
Eurobonds [member] | Floating interest rate [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Borrowings |  | £ 423.3 | £ 449.2 |  |
Floating basis |  | EURIBOR | EURIBOR |  |
Period (months) | [1] | 16 months |  |  |
Other bonds [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Borrowings |  | £ 49.6 | £ 114.3 |  |
[1] | Weighted average. These rates do not include the effect of gains on interest rate swap terminations that are written to income over the life of the original instrument.

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