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Accounting policies - Additional Information (Detail) - GBP (£) £ / shares in Units, £ in Millions |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Disclosure of initial application of standards or interpretations [line items] |  |  |  |
Right of Use Assets |  | £ 1,825.2 |  |
Lease Liability |  | 2,345.7 |  |
Retained earnings |  | 9,652.4 | £ 10,018.8 | £ 9,541.4
Deferred tax asset |  | £ 155.4 | £ 169.9 | £ 153.0
Diluted earning per share |  | £ 0.248 | £ 0.534 | £ 0.843
Weighted average discount rate | 5.40% |  |  |
Impact on Initial Application of IFRS16 [member] |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |
Right of Use Assets | £ 1,895.1 |  |  |
Lease Liability | 2,326.2 |  |  |
Reduction in other creditors | 233.5 |  |  |
Reduction in property provisions | 68.7 |  |  |
Retained earnings | (128.9) |  |  |
Deferred tax asset | £ 27.8 |  |  |
Increase to Operating profit |  | £ 33.7 |  |
Diluted earning per share |  | £ (0.008) |  |

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