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Accounting policies - Schedule of Impact of Adjustments on Key Income Statement Items (Detail) - GBP (£) £ / shares in Units, £ in Millions, shares in Millions | 6 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
Disclosure of reclassifications or changes in presentation [line items] |  |  |  |
General and administrative costs |  | £ 452.8 | £ 3,528.6 | [1]
Operating profit/(loss) |  | 483.6 | (2,750.6) | [1]
Loss before interest and taxation |  | 523.6 | (2,802.5) | [1]
Loss before taxation |  | 394.4 | (3,177.2) | [1]
Loss for the period from continuing operations |  | 287.3 | (3,188.1) | [1]
(Loss)/Profit for the period |  | 287.3 | (3,185.0) | [1]
Profit (Loss) for the period attributable to equity holders of the parent |  | £ 252.7 | £ (3,209.2) | [1]
Weighted average shares used in basic EPS calculation |  | 1,211.9 | 1,224.7 |
Basic earnings (loss) per share from continuing operations |  | £ 0.209 | £ (2.620) | [1]
As Previously Reported [member] |  |  |  |
Disclosure of reclassifications or changes in presentation [line items] |  |  |  |
General and administrative costs | [2] |  | £ 3,195.3 |
Operating profit/(loss) | [2] |  | (2,417.3) |
Loss before interest and taxation | [2] |  | (2,469.2) |
Loss before taxation | [2] |  | (2,843.9) |
Loss for the period from continuing operations | [2] |  | (2,867.9) |
(Loss)/Profit for the period | [2] |  | (2,864.8) |
Profit (Loss) for the period attributable to equity holders of the parent | [2] |  | £ (2,889.0) |
Weighted average shares used in basic EPS calculation | [2] |  | 1,224.7 |
Basic earnings (loss) per share from continuing operations | [2] |  | £ (2.359) |
Adjusted [member] |  |  |  |
Disclosure of reclassifications or changes in presentation [line items] |  |  |  |
General and administrative costs |  |  | £ 3,528.6 |
Operating profit/(loss) |  |  | (2,750.6) |
Loss before interest and taxation |  |  | (2,802.5) |
Loss before taxation |  |  | (3,177.2) |
Loss for the period from continuing operations |  |  | (3,188.1) |
(Loss)/Profit for the period |  |  | (3,185.0) |
Profit (Loss) for the period attributable to equity holders of the parent |  |  | £ (3,209.2) |
Weighted average shares used in basic EPS calculation |  |  | 1,224.7 |
Basic earnings (loss) per share from continuing operations |  |  | £ (2.620) |
[1] | Figures have been restated as described in the accounting policies.
[2] | As previously reported in the Company’s Form 6-K/A filed on 12 February 2021.

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