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Loans and other borrowings - Summary of Loans and Other Borrowings (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2017 GBP (£)
GBP400m 3.875% bonds 2022 [member] |
Disclosure of detailed information about borrowings [line items] |
Notional amount | £ 400,000,000
Bond interest rate | 3.875%
Bond maturity period | 28 November 2022
GBP300m 3.75% bonds 2025 [member] |
Disclosure of detailed information about borrowings [line items] |
Notional amount | £ 300,000,000
Bond interest rate | 3.75%
Bond maturity period | 14 August 2025
GBP350m 2.125% bonds 2026 [member] |
Disclosure of detailed information about borrowings [line items] |
Notional amount | £ 350,000,000
Bond interest rate | 2.125%
Bond maturity period | 24 August 2026

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