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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
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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

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- 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 15 -IssueDate 2017-01-01 -Paragraph 105 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2017-03-01&anchor=para_105&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 15 -IssueDate 2017-01-01 -Paragraph 116 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2017-03-01&anchor=para_116_a&doctype=Standard -URIDate 2017-03-09 + Details
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- 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 -URIDate 2017-03-09 + Details
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- 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 -Number 1 -IssueDate 2017-01-01 -Paragraph 78 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_78&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of non-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 -URIDate 2017-03-09 + Details
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