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Analysis of cash flows - Summary of Analysis of Cash Flows (Detail) - GBP (£) £ in Millions | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Cash Flow Statement [Line Items] |  |  |  |  |  |  |
Profit for the period | £ 705.5 | £ 1,278.6 | £ 633.7 | [1] | £ 1,912.3 | [1] |
Taxation | 141.0 |  | 145.5 |  | 197.0 |  |
Revaluation of financial instruments | (81.1) |  | (83.9) | [1] | (262.2) | [1] |
Finance costs | 134.2 |  | 133.5 |  | 269.8 |  |
Finance income | (48.3) |  | (44.9) |  | (95.2) |  |
Share of results of associates | (9.4) |  | (59.5) |  | (113.5) |  |
Non-cash share-based incentive plans (including share options) | 41.6 |  | 50.6 |  | 105.0 |  |
Depreciation of property, plant and equipment | 109.2 |  | 115.6 |  | 230.7 |  |
Goodwill impairment |  |  |  |  | 27.1 |  |
Amortisation and impairment of acquired intangible assets | 84.0 |  | 97.8 |  | 195.1 |  |
Amortisation of other intangible assets | 18.3 |  | 18.3 |  | 36.3 |  |
Investment write-downs | 1.5 |  |  |  | 95.9 |  |
Gains on disposal of investments and subsidiaries | (189.9) |  | (5.9) |  | (129.0) |  |
(Gains)/losses on remeasurement of equity interests arising from a change in scope of ownership | (0.1) |  | 0.2 |  | 0.3 |  |
(Gains)/losses on sale of property, plant and equipment | (0.3) |  | 0.1 |  | 1.1 |  |
Movements in trade working capital | (192.0) |  | (257.8) |  | (261.2) |  |
Movements in other receivables, payables and provisions1 | (363.5) |  | (365.7) |  | (270.6) |  |
Corporation and overseas tax paid | (251.3) |  | (254.2) |  | (424.7) |  |
Interest and similar charges paid | (89.8) |  | (96.6) |  | (246.6) |  |
Interest received | 39.6 |  | 35.2 |  | 76.9 |  |
Investment income | 10.3 |  | 5.4 |  | 16.8 |  |
Dividends received from associates | 13.4 |  | 18.2 |  | 46.8 |  |
Net cash inflow from operating activities | 72.9 |  | 85.6 |  | 1,408.1 |  |
Acquisitions and disposals: |  |  |  |  |  |  |
Initial cash consideration | (18.9) |  | (108.6) |  | (214.8) |  |
Cash and cash equivalents acquired (net) | (4.1) |  | 15.7 |  | 28.9 |  |
Earnout payments | (38.0) |  | (61.7) |  | (199.1) |  |
Purchase of other investments (including associates) | (34.0) |  | (52.6) |  | (92.5) |  |
Proceeds on disposal of investments and subsidiaries | 469.0 |  | 5.8 |  | 296.0 |  |
Acquisitions and disposals | 374.0 |  | (201.4) |  | (181.5) |  |
Cash consideration for non-controlling interests | (79.8) |  | (39.3) |  | (47.3) |  |
Net acquisition payments and disposal proceeds | 294.2 |  | (240.7) |  | (228.8) |  |
Share repurchases and buy-backs: |  |  |  |  |  |  |
Purchase of own shares by ESOP Trusts | (96.5) |  | (145.3) |  | (214.6) |  |
Shares purchased into treasury | (104.3) | (144.7) | (144.9) |  | (289.6) |  |
Net cash outflow | (200.8) |  | (290.2) |  | (504.2) |  |
Net increase/(decrease) in borrowings: |  |  |  |  |  |  |
(Decrease)/increase in drawings on bank loans | (349.0) |  | 1,080.8 |  | 785.6 |  |
Net cash inflow/(outflow) | 67.0 |  | 894.8 |  | 599.6 |  |
Cash and cash equivalents: |  |  |  |  |  |  |
Cash at bank and in hand | 2,111.3 | 2,049.6 | 2,524.9 |  | 2,049.6 |  |
Short-term bank deposits | 109.7 | 341.8 | 331.1 |  | 341.8 |  |
Overdrafts | (299.4) | (393.2) | (644.5) |  | (393.2) |  |
Cash and cash equivalents | 1,921.6 | £ 1,998.2 | 2,211.5 |  | 1,998.2 |  | £ 1,902.6
Proceeds from issue of EURO 250 million bonds [member] |  |  |  |  |  |  |
Net increase/(decrease) in borrowings: |  |  |  |  |  |  |
Proceeds from issue of bonds | 218.8 |  | 214.0 |  | 214.0 |  |
Proceeds from issue of EURO 500 million bonds [member] |  |  |  |  |  |  |
Net increase/(decrease) in borrowings: |  |  |  |  |  |  |
Proceeds from issue of bonds | 438.0 |  |  |  |  |  |
Partial repayment of USD 300 million bonds [member] |  |  |  |  |  |  |
Net increase/(decrease) in borrowings: |  |  |  |  |  |  |
Partial repayment of bonds | (20.8) |  |  |  |  |  |
Repayment of EURO 252 million bonds [member] |  |  |  |  |  |  |
Net increase/(decrease) in borrowings: |  |  |  |  |  |  |
Partial repayment of bonds | £ (220.0) |  |  |  |  |  |
Repayment of GBP 400 million bonds [member] |  |  |  |  |  |  |
Net increase/(decrease) in borrowings: |  |  |  |  |  |  |
Partial repayment of bonds |  |  | £ (400.0) |  | £ (400.0) |  |
[1] | Prior year figures have been restated for the impact of the adoption of IFRS 15: Revenue from Contracts with Customers and the change in income statement presentation, as described in note 2.

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