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Accounting policies - Schedule of Reconciliation about operating lease obligations (Detail) - GBP (£) £ in Millions	Jun. 30, 2019	Jan. 01, 2019
Disclosure of initial application of standards or interpretations [line items]
Operating lease commitments at 31 December 2018		£ 3,628.2
Short-term leases not included in lease liabilities		(73.8)
Extension options reasonably certain to be exercised		115.1
Signed leases not yet commenced		(598.1)
Gross lease liabilities	£ 3,239.5
Effect of discounting	(893.8)
Lease liabilities	£ 2,345.7
Impact on Initial Application of IFRS16 [member]
Disclosure of initial application of standards or interpretations [line items]
Gross lease liabilities		3,071.4
Effect of discounting		(745.2)
Lease liabilities		£ 2,326.2

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- Definition

The amount of contractual undiscounted cash flows in relation to lease liabilities before deducting finance charges. [Refer: Lease liabilities]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2019-01-01
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-IssueDate 2018-01-01
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-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=16&date=2018-03-01&anchor=para_58&doctype=Standard
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- Definition

The amount of the lease commitments for short-term leases accounted for applying paragraph 6 of IFRS 16. Short-term lease is a lease that, at the commencement date, has a lease term of 12 months or less. A lease that contains a purchase option is not a short-term lease.

+ References

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-Note Effective 2019-01-01
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-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=16&date=2018-03-01&anchor=para_55&doctype=Standard
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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.

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-Note Effective 2019-01-01
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Effect of discounting lease liabilities.

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Extension options reasonability certain to be exercised.

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Operating lease commitment.

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Signed leases not yet commenced.

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