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Leases - Summary of Maturity of Lease Liabilities (Detail) £ in Millions	Dec. 31, 2019 GBP (£)
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
Long-term lease liabilities at 31 December 2019	1,947.5
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

X

- Definition

The amount of current lease liabilities. [Refer: Lease liabilities]

+ References

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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

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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

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Disclosure Of Leases.

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Effect of discounting lease liabilities.

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