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Accounting policies - IFRS 16 Implementation - Additional Information (Detail) - GBP (£) £ / shares in Units, £ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of initial application of standards or interpretations [line items] |  |  |  |
Right-of-use assets |  | £ 1,734.5 |  |
Lease liabilities |  | 2,249.7 |  |
Change in operating profit |  | £ 61.0 |  |
Weighted average discount rate | 5.40% |  |  |
Retained earnings | £ 128.9 |  |  |
Deferred tax assets | 27.8 |  |  |
Diluted earning per share |  | £ 0.495 | £ 0.843 | £ 1.424
Impact on Initial Application of IFRS16 [member] |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |
Right-of-use assets | 1,895.1 |  | £ 1,895.1 |
Lease liabilities | 2,326.2 |  | £ 2,326.2 |
Reduction in other creditors | 233.5 |  |  |
Reduction in property provisions | £ 68.7 |  |  |
Diluted earning per share |  | £ (0.018) |  |

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- Definition The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator), divided by the weighted average number of ordinary shares outstanding during the period (the denominator), both adjusted for the effects of all dilutive potential ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2019-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2019-en-r&anchor=para_66&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 53 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_j&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Decrease to retained earnings due to the adoption of IFRS 16. + References No definition available. + Details
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- Details
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