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Loans and Other Borrowings - Summary of Loans and Other Borrowings (Parenthetical) (Detail) € in Millions, £ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 EUR (€) | Dec. 31, 2020 GBP (£) | Dec. 31, 2019 GBP (£)
GBP173m 3.875% bonds 2022 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Notional amount |  | £ 173 | £ 400
Bond interest rate | 3.875% | 3.875% | 3.875%
Maturity date | 28 November 2022 |  |
EUR500m 1.625% bonds 2024 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Notional amount | € | € 500 |  |
Bond interest rate | 1.625% | 1.625% | 1.625%
Maturity date | 8 October 2024 |  |
GBP300m 3.75% bonds 2025 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Notional amount |  | £ 300 |
Bond interest rate | 3.75% | 3.75% | 3.75%
Maturity date | 14 August 2025 |  |
GBP350m 2.125% bonds 2026 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Notional amount |  | £ 350 |
Bond interest rate | 2.125% | 2.125% | 2.125%
Maturity date | 24 August 2026 |  |
EUR500m 2.125% bonds 2027 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Notional amount | € | € 500 |  |
Bond interest rate | 2.125% | 2.125% | 2.125%
Maturity date | 15 May 2027 |  |
GBP400m 3.375% bonds 2028 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Notional amount |  | £ 400 |
Bond interest rate | 3.375% | 3.375% | 3.375%
Maturity date | 8 October 2028 |  |

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