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Revenue and Contract Balances - Summary of Contract Assets and Contract Liabilities (Detail) - GBP (£) £ in Millions	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Contract assets
Accrued income falling due within one year	£ 3,672.4	£ 3,205.8	£ 3,379.4
Accrued income falling due after more than one year	21.8	20.5	21.9
Contract assets	3,694.2	3,226.3	3,401.3
Contract liabilities
Deferred income	£ 1,284.5	£ 1,212.1	£ 1,188.3

X

- Definition

The amount of an entity’s right to consideration in exchange for goods or services that the entity has transferred to a customer, when that right is conditioned on something other than the passage of time (for example, the entity’s future performance).

+ References

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-Note Effective 2018-01-01
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-Note Effective 2018-01-01
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+ Details

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X

- References

No definition available.

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X

- References

No definition available.

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X

- Definition

The amount of current accrued income. [Refer: Accrued income]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard
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X

- Definition

The amount of liability representing income that has been received but is not yet earned. [Refer: Revenue]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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-IssueDate 2017-01-01
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X

- Definition

The amount of non-current accrued income. [Refer: Accrued income]

+ References

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-IssueDate 2017-01-01
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