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Financial instruments - Additional Information (Detail) € in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 GBP (£) | Dec. 31, 2019 EUR (€) | 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 | 4.10% |  | 3.20% | 3.20%
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 | 3,800,000 |  | £ 5,800,000 |
Decrease in combined liabilities due to earn out and put option arrangement | 6,600,000 |  | 8,700,000 |
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 | 4,000,000 |  | 6,400,000 |
Decrease in combined liabilities due to earn out and put option arrangement | 3,900,000 |  | 6,300,000 |
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 |  |  |
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% | 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% | 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% | 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% | 2.34% |  |
Contracts due in March 2025 [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Receipts | € |  | € 500.0 |  |
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 |
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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