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Other reserves - Summary of Other Reserves (Detail) - GBP (£) £ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of reserves within equity [line items] |  |  |  |
Beginning balance | [1] | £ 962.4 | £ 1,119.1 |
Exchange adjustments recycled to the income statement on disposal of discontinued operations | [1] | (284.0) |  |
Share cancellations | [1] | (47.7) |  |
Exchange adjustments on foreign currency net investments | [1] | (625.1) | 284.0 | £ (659.8)
Gain (loss) on revaluation of available for sale investments | [1] |  |  | 32.1
Recognition and remeasurement of financial instruments | [1] | 23.7 | (13.9) | (20.4)
Share purchases – close period commitments | [1],[2] | (252.3) |  |
Ending balance | [1] | (169.9) | 962.4 | 1,119.1
Capital redemption reserve [member] |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |
Beginning balance |  | 2.7 | 2.7 | 2.7
Share cancellations |  | 0.5 |  |
Ending balance |  | 3.2 | 2.7 | 2.7
Equity reserve [member] |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |
Beginning balance | [3] | (236.4) | (212.1) | (203.4)
Recognition and remeasurement of financial instruments | [3] | 10.6 | (24.3) | (8.7)
Share purchases – close period commitments | [3] | (252.3) |  |
Ending balance | [3] | (478.1) | (236.4) | (212.1)
Revaluation reserve [member] |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |
Beginning balance |  |  | 303.4 | 271.3
Gain (loss) on revaluation of available for sale investments |  |  |  | 32.1
Accounting policy change (IFRS 9) | [1] |  | (303.4) |
Ending balance |  |  |  | 303.4
Translation reserve [member] |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |
Beginning balance | [1] | 1,196.1 | 1,025.1 | 1,665.2
Exchange adjustments recycled to the income statement on disposal of discontinued operations | [1] | (284.0) |  |
Exchange adjustments on foreign currency net investments | [1] | (607.1) | 275.0 | (640.1)
Accounting policy change (IFRS 9) | [1] |  | (104.0) |
Ending balance | [1] | 305.0 | 1,196.1 | 1,025.1
Other reserves [member] |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |
Beginning balance |  | 962.4 | 1,119.1 | 1,735.8
Exchange adjustments recycled to the income statement on disposal of discontinued operations | [1] | (284.0) |  |
Share cancellations | [1] | 0.5 |  |
Exchange adjustments on foreign currency net investments | [1] | (607.1) | 275.0 | (640.1)
Gain (loss) on revaluation of available for sale investments | [1] |  |  | 32.1
Accounting policy change (IFRS 9) | [1] |  | (407.4) |
Recognition and remeasurement of financial instruments | [1] | 10.6 | (24.3) | (8.7)
Share purchases – close period commitments | [1],[2] | (252.3) |  |
Ending balance |  | £ (169.9) | £ 962.4 | £ 1,119.1
[1] | Figures have been restated, as described in the accounting policies.
[2] | During 2019, the Company entered into an arrangement with a third party to conduct share buybacks on its behalf in the close period commencing on 2 January 2020 and ending on 27 February 2020, in accordance with UK listing rules. The commitment resulting from this agreement constitutes a liability at 31 December 2019, which is included in Trade and other payables: amounts falling due within one year and has been recognised as a movement in equity.
[3] | Figures have been restated to be in accordance with IAS 39 Financial Instruments: Recognition and Measurement, as described in the accounting policies.

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