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Authorised and issued share capital - Summary of Authorised and Issued Share Capital (Detail) £ in Millions | 12 Months Ended |
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Dec. 31, 2019 GBP (£) shares | Dec. 31, 2018 GBP (£) shares | Dec. 31, 2017 GBP (£) shares | Dec. 31, 2016 GBP (£) shares
Disclosure of classes of share capital [line items] |  |  |  |  |
Issued and fully paid capital, Beginning balance | [1] | £ 133.3 | £ 133.3 |  |
Share cancellations | [1] | (47.7) |  |  |
Issued and fully paid capital, Ending balance | [1] | £ 132.8 | £ 133.3 | £ 133.3 |
Ordinary shares [member] |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Equity ordinary shares, authorised | shares |  | 1,750,000,000 | 1,750,000,000 | 1,750,000,000 | 1,750,000,000
Nominal value of Authorised shares |  | £ 175.0 | £ 175.0 | £ 175.0 | £ 175.0
Number of shares issued and fully paid, Beginning balance | shares |  | 1,332,678,227 | 1,332,511,552 | 1,331,880,730 |
Exercise of share options | shares |  | 75,625 | 166,675 | 630,822 |
Share cancellations | shares |  | (4,586,039) |  |  |
Number of shares issued and fully paid, Ending balance | shares |  | 1,328,167,813 | 1,332,678,227 | 1,332,511,552 |
Issued and fully paid capital, Beginning balance |  | £ 133.3 | £ 133.3 | £ 133.2 |
Exercise of share options |  |  |  | 0.1 |
Share cancellations |  | (0.5) |  |  |
Issued and fully paid capital, Ending balance |  | £ 132.8 | £ 133.3 | £ 133.3 |
[1] | Figures have been restated, as described in the accounting policies.

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