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Trade and other receivables - Additional Information (Detail) - GBP (£) £ in Millions | 6 Months Ended | 12 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items] |  |  |
Allowance for bad and doubtful debts as a percentage of gross trade accounts receivables | 2.50% | 1.60% | 1.60%
Trade receivables [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Bad debt expenses | £ 29.2 | £ 12.3 | £ 25.8
Overdue for more than 1 year [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Percentage of the asset aged or overdue for creating additional provison for losses | 100.00% |  |
Overdue for 6 months or more and for less than 1 year [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Percentage of the asset aged or overdue for creating additional provison for losses | 50.00% |  |

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- Definition The amount of additional allowance for credit losses of financial assets recognised in profit or loss. [Refer: Allowance account for credit losses of financial assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b -URIDate 2019-03-27 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition Allowance for bad and doubtful debts percentage. + References No definition available. + Details
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- Definition Percentage of the asset overdue or aged for creating additional provisions. + References No definition available. + Details
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- Details
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- Details
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- Details
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