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Financial instruments - Analysis of Financial Instruments Measured at Fair Value (Detail) - GBP (£) £ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Beginning balance | [1] | £ 666.7 |  | £ 1,153.5 |  |
Payments due to vendors (earnout agreements) (note 20) |  | (243.7) | [2] | (400.8) | [2] | £ (584.5)
Ending balance | [1] | 498.3 |  | 666.7 |  |
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] |  |  |  |  |  |
Beginning balance |  | 0.4 |  |  |  |
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] |  |  |  |  |  |
Beginning balance |  | 128.1 |  |  |  |
Ending balance |  | 42.2 |  | 128.1 |  |
At Fair Value [member] | Level 2 [member] | Derivatives in designated hedge relationships [member] | Derivatives Liabilities [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Derivative liabilities |  |  |  | (14.2) |  |
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 |  | (22.7) | [1] | (2.6) |  |
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 |  | 1.4 | [1] | 1.3 |  |
At Fair Value [member] | Level 3 [member] | Liabilities in Respect of Put Options [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Beginning balance | [1] |  |  | (221.7) |  |
At Fair Value [member] | Level 3 [member] | Held for trading [member] | Liabilities in Respect of Put Options [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Beginning balance | [1] | (208.0) |  |  |  |
Losses recognised in other comprehensive income | [1] | (30.1) |  | 26.0 |  |
Exchange adjustments | [1] | 6.9 |  | 1.1 |  |
Additions | [1] | (34.8) |  | (37.4) |  |
Cancellations | [1] | 9.7 |  | 2.2 |  |
Transfer to disposal group classified as held for sale | [1] | 31.0 |  |  |  |
Settlements | [1] | 20.8 |  | 21.8 |  |
Ending balance | [1] | (204.5) |  | (208.0) |  |
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 |  | 820.3 |  |
Gains recognised in the income statement |  | 9.1 |  | 61.1 |  |
Losses recognised in other comprehensive income |  | (55.4) |  | (140.6) |  |
Additions |  | 18.2 |  | 35.0 |  |
Disposals |  | (53.4) |  | (237.3) |  |
Reclassifications from other investments to interests in associates |  |  |  | (0.3) |  |
Transfer To Disposal Group Classified As Held For Sale |  | (0.6) |  |  |  |
Ending balance |  | 456.1 |  | 538.2 |  |
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 20) |  | (243.7) | [2] | (400.8) |  |
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 |  | (204.5) | [2] | (208.0) |  |
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] |  |  |  |  |  |
Beginning balance |  | 255.7 | [2] | 319.2 |  |
Ending balance | [2] |  |  | 255.7 |  |
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] |  |  |  |  |  |
Beginning balance |  | 219.0 |  |  |  |
Ending balance |  | £ 200.4 | [2] | £ 219.0 |  |
[1] | Figures have been restated, as described in the accounting policies.
[2] | Figures have been restated to be in accordance with IAS 39 Financial Instruments: Recognition and Measurement, as described in the accounting policies.

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