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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.