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Sources of finance - Summary of Equity and Debt Financing (Detail) - GBP (£) £ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Analysis of changes in financing |  |  |  |
Beginning balance | [1] | £ 9,784.3 | £ 9,960.5 | £ 9,812.2
Ordinary shares issued | [1] | 0.6 | 1.2 | 6.4
Share cancellations | [1] | (47.7) |  |
End of year, restated | [1] | 8,415.8 | 9,784.3 | 9,960.5
Analysis of changes in financing |  |  |  |
Beginning of year |  | 6,217.9 |  |
Net decrease in drawings on bank loans and corporate bonds |  | (1,713.2) | (440.6) | 599.6
End of year |  | 4,272.9 | 6,217.9 |
Issued capital and share premium [member] |  |  |  |
Analysis of changes in financing |  |  |  |
Beginning balance |  | 703.0 | 701.8 |
Ordinary shares issued |  | 0.6 | 1.2 |
Share cancellations |  | (0.5) |  |
End of year, restated |  | 703.1 | 703.0 | 701.8
Debt financing [member] |  |  |  |
Analysis of changes in financing |  |  |  |
Beginning of year |  | 6,217.9 | 6,481.3 |
Net decrease in drawings on bank loans and corporate bonds |  | (1,713.2) | (440.6) |
Amortisation of financing costs included in debt |  | 10.3 | 7.7 |
Changes in fair value due to hedging arrangements |  | 14.3 | (9.9) |
Other movements |  | 1.5 | (0.2) |
Exchange adjustments |  | (257.9) | 179.6 |
End of year |  | £ 4,272.9 | £ 6,217.9 | £ 6,481.3
[1] | Figures have been restated, as described in the accounting policies.

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