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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 | £ 666.7 | £ 1,153.5 |
Payments due to vendors (earnout agreements) (note 20) | (253.8) | (414.7) | £ (630.7)
Ending balance | 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 | (21.2) | (14.2) |
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 |  | 8.4 |
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 | (1.5) | (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 | 1.3 |
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 | (242.0) | (258.1) |
Losses recognised in other comprehensive income | (19.4) | 34.5 |
Exchange adjustments | 11.7 | 1.1 |
Additions | (38.6) | (43.5) |
Cancellations | 9.7 | 2.2 |
Transfer to disposal group classified as held for sale | 31.0 |  |
Settlements | 20.8 | 21.8 |
Ending balance | (226.8) | (242.0) |
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) | (253.8) | (414.7) |
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 | (226.8) | (242.0) |
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 | 319.2 |
Ending balance |  | 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 | £ 219.0 |

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