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Leases - Summary of Maturity of Lease Liabilities (Detail) £ in Millions | Dec. 31, 2019 GBP (£)
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Disclosure Of Leases [Line Items] |  |
Lease liability | £ 3,002.5 |
Effect of discounting | (752.8) |
Lease liability at 31 Dec 2019 | 2,249.7 |
Short-term lease liabilities at 31 December 2019 | 302.2 | [1]
Long-term lease liabilities at 31 December 2019 | 1,947.5 | [1]
Maturities in calendar year 2020 [member] |  |
Disclosure Of Leases [Line Items] |  |
Lease liability | 385.9 |
Maturities in calendar year 2021 [member] |  |
Disclosure Of Leases [Line Items] |  |
Lease liability | 384.0 |
Maturities in calendar year 2022 [member] |  |
Disclosure Of Leases [Line Items] |  |
Lease liability | 335.4 |
Maturities in calendar year 2023 [member] |  |
Disclosure Of Leases [Line Items] |  |
Lease liability | 283.0 |
Maturities in calendar year 2024 [member] |  |
Disclosure Of Leases [Line Items] |  |
Lease liability | 220.5 |
Maturity in later than calendar year 2025 [member] |  |
Disclosure Of Leases [Line Items] |  |
Lease liability | £ 1,393.7 |
[1] | Figures have been restated, as described in the accounting policies.

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- Definition The amount of current lease liabilities. [Refer: Lease liabilities] + 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 contractual undiscounted cash flows in relation to lease liabilities before deducting finance charges. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 58 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_58&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph B11D -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_B11D_a&doctype=Appendix&subtype=B -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 non-current lease liabilities. [Refer: Lease liabilities] + 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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