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Financial instruments - Analysis of Financial Instruments Measured at Fair Value (Detail) - GBP (£) £ in Millions | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Beginning balance | £ 666.7 |  |  |
Payments due to vendors (earnout agreements) (note 19) | (371.5) | £ (414.7) | £ (542.9) | £ (630.7)
Ending balance | 574.7 |  |  |
At Fair Value [member] | Level 1 [member] | Held at fair value through profit or loss [member] | Other investments [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Ending balance | 0.4 |  |  |
At Fair Value [member] | Level 1 [member] | Held at fair value through other comprehensive income [member] | Other investments [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Ending balance | 46.0 |  |  |
At Fair Value [member] | Level 2 [member] | Derivatives in designated hedge relationships [member] | Derivatives Assets [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Derivative assets | 6.3 |  |  |
At Fair Value [member] | Level 2 [member] | Held at fair value through profit or loss [member] | Derivatives Liabilities [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Derivative liabilities | (4.0) |  |  |
At Fair Value [member] | Level 2 [member] | Held at fair value through profit or loss [member] | Derivatives Assets [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Derivative assets | 10.0 |  |  |
At Fair Value [member] | Level 3 [member] | Held at fair value through profit or loss [member] | Trade And Other Payables To Trade Suppliers [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Payments due to vendors (earnout agreements) (note 19) | (371.5) |  |  |
At Fair Value [member] | Level 3 [member] | Held at fair value through profit or loss [member] | Liabilities in Respect of Put Options [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Liabilities in respect of put options | (264.4) |  |  |
Beginning balance | (242.0) |  |  |
(Losses)/gains recognised in the income statement | (25.4) |  |  |
Gains recognised in other comprehensive income | 0.0 |  |  |
Exchange adjustments | (0.3) |  |  |
Additions | (2.1) |  |  |
Disposals | 0.0 |  |  |
Cancellations | 1.0 |  |  |
Settlements | 4.4 |  |  |
Ending balance | (264.4) |  |  |
At Fair Value [member] | Level 3 [member] | Held at fair value through profit or loss [member] | Other investments [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Ending balance | 300.6 |  |  |
At Fair Value [member] | Level 3 [member] | Held at fair value through other comprehensive income [member] | Other investments [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Ending balance | 227.7 |  |  |
At Fair Value [member] | Level 3 [member] | Equity investments [member] | Other investments [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Beginning balance | 538.2 |  |  |
(Losses)/gains recognised in the income statement | 1.6 |  |  |
Gains recognised in other comprehensive income | 6.4 |  |  |
Exchange adjustments | 0.0 |  |  |
Additions | 6.6 |  |  |
Disposals | (24.5) |  |  |
Cancellations | 0.0 |  |  |
Settlements | 0.0 |  |  |
Ending balance | £ 528.3 |  |  |

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