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Risk management policies - Summary of currency risk (Detail) - Currency risk [member] - GBP (£) £ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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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 | £ 162.5 | £ 232.5
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 | £ 125.2 | £ 192.2

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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. + References No definition available. + Details
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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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- Details
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- Details
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- Details
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