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Risk management policies - Summary of currency risk (Detail) - Currency risk [member] - GBP (£) £ in Millions		Dec. 31, 2019	Dec. 31, 2018
Euro [member]
Disclosure of risk management strategy related to hedge accounting [line items]
Accumulated fair value hedge adjustment on hedged item included in carrying amount, assets	[1]	£ 153.0	£ 211.4
US dollar [member]
Disclosure of risk management strategy related to hedge accounting [line items]
Accumulated fair value hedge adjustment on hedged item included in carrying amount, assets	[1]	£ 240.5	£ 278.1
[1] Figures have been restated, as described in the accounting policies.

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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No definition available.

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- Definition

Losses/Gains resulting from a weakening/strengthening of sterling against major currencies, which would be posted directly to equity.

+ References

No definition available.

+ Details

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