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Financial instruments - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 GBP (£) | Dec. 31, 2018 GBP (£) | Dec. 31, 2018 USD ($)
Disclosure of detailed information about financial instruments [line items] |  |  |
Nominal amount | £ 6,309,800,000 |  |
Weighted average growth rate | 19.50% | 22.70% | 22.70%
Risk adjusted discount rate | 1.40% | 2.90% | 2.90%
Offset of cash and short-term deposits and bank overdrafts | £ 6,832,800,000 | £ 6,214,200,000 |
An increase or decrease in the multiple of one times revenue [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Increase or decrease in fair value of other investments | 53,600,000 |  |
Increase decrease on Income statement due to change in fair value of other investment | 3,300,000 |  |
Increase decrease on equity due to change in fair value of other investment | 50,300,000 |  |
One percentage point increase or decrease [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Increase in combined liabilities due to earn out and put option arrangement | 4,600,000 | 6,800,000 |
Decrease in combined liabilities due to earn out and put option arrangement | 7,700,000 | 10,400,000 |
0.5 percentage point increase or decrease [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Increase in combined liabilities due to earn out and put option arrangement | 5,700,000 | 7,200,000 |
Decrease in combined liabilities due to earn out and put option arrangement | 5,600,000 | 7,100,000 |
Interest Rate Swap Contract [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Fair value estimated to be a net asset (liability) | 0 | 14,200,000 |
Gain (loss) on changes in the fair value relating to the ineffective portion | 1,000,000 | 900,000 |
Gain (loss) on changes in the fair value relating to the ineffective portion, loss on hedging instruments | (13,300,000) |  |
Gain (loss) on changes in the fair value relating to the ineffective portion, gain on hedged items | 14,300,000 |  |
Interest Rate Swap Contract [member] | Trade and other receivable [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative assets | 0 | 0 |
Interest Rate Swap Contract [member] | Trade and Other Payable [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative liabilities | £ 0 | 14,200,000 |
Interest Rate Swap Contract [member] | Until September 2022 [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Nominal amount | $ |  |  | $ 500,000,000
Interest Rate Swap Contract [member] | Fixed interest rate [member] | Until September 2022 [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative interest rates | 3.63% |  |
Interest Rate Swap Contract [member] | Fixed interest rate [member] | Until November 2021 [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative interest rates | 4.75% |  |
Interest Rate Swap Contract [member] | Floating interest rate [member] | Until September 2022 [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative interest rates, LIBOR adjustment | 1.52% |  |
Interest Rate Swap Contract [member] | Floating interest rate [member] | Until November 2021 [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative interest rates, LIBOR adjustment | 2.34% |  |
Contracts due in March 2025 [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Receipts | £ 500,000,000 |  |
Payments | 444,100,000 |  |
Derivatives in designated hedge relationships [member] | Foreign Exchange Contracts [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Fair value estimated to be a net asset (liability) | (21,200,000) | 8,400,000 |
Deferred amount in equity | 29,200,000 | 17,900,000 |
Gain (loss) on changes in the fair value relating to the ineffective portion | 0 | (11,100,000) |
Derivatives in designated hedge relationships [member] | Foreign Exchange Contracts [member] | Trade and other receivable [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative assets | 0 | 8,400,000 |
Derivatives in designated hedge relationships [member] | Foreign Exchange Contracts [member] | Trade and Other Payable [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative liabilities | 21,200,000 | 0 |
Derivatives not designated as hedges [member] | Foreign Exchange Contracts [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Fair value estimated to be a net asset (liability) | (100,000) | (1,300,000) |
Nominal amount | £ 151,700,000 | £ 296,100,000 |

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- Definition The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The gain (loss) on the change in fair value of the hedged item used as a basis for recognising hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 24B -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_24B_a_iv&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 24B -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_24B_b_i&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The gain (loss) on the change in fair value of the hedging instrument used as a basis for recognising hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 24A -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_24A_c&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The gross amount of recognised financial assets that are subject either to offsetting or to an enforceable master netting arrangement or similar agreement. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 13C -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_13C_a&doctype=Standard -URIDate 2019-03-27 + Details
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