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Financial instruments - Fair Value of assets and liabilities (Detail) - GBP (£) £ in Millions | Jun. 30, 2022 | Dec. 31, 2021
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Disclosure of detailed information about financial instruments [line items] |  |
Other investments | £ 372.9 | £ 318.3
Recurring fair value measurement | Level 1 | Held at fair value through profit or loss |  |
Disclosure of detailed information about financial instruments [line items] |  |
Other investments | 0.4 |
Recurring fair value measurement | Level 1 | Held at fair value through other comprehensive income |  |
Disclosure of detailed information about financial instruments [line items] |  |
Other investments | 19.2 |
Recurring fair value measurement | Level 1 | Derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Liabilities | 0.0 |
Recurring fair value measurement | Level 1 | Derivatives | Held at fair value through profit or loss |  |
Disclosure of detailed information about financial instruments [line items] |  |
Liabilities | 0.0 |
Recurring fair value measurement | Level 1 | Payments due to vendors (earnout agreements) | Held at fair value through profit or loss |  |
Disclosure of detailed information about financial instruments [line items] |  |
Liabilities | 0.0 |
Recurring fair value measurement | Level 1 | Liabilities in respect of put options | Held at fair value through profit or loss |  |
Disclosure of detailed information about financial instruments [line items] |  |
Liabilities | 0.0 |
Recurring fair value measurement | Level 1 | Derivatives | Held at fair value through profit or loss |  |
Disclosure of detailed information about financial instruments [line items] |  |
Assets | 0.0 |
Recurring fair value measurement | Level 2 | Held at fair value through profit or loss |  |
Disclosure of detailed information about financial instruments [line items] |  |
Other investments | 0.0 |
Recurring fair value measurement | Level 2 | Held at fair value through other comprehensive income |  |
Disclosure of detailed information about financial instruments [line items] |  |
Other investments | 0.0 |
Recurring fair value measurement | Level 2 | Derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Liabilities | (64.2) |
Recurring fair value measurement | Level 2 | Derivatives | Held at fair value through profit or loss |  |
Disclosure of detailed information about financial instruments [line items] |  |
Liabilities | (3.9) |
Recurring fair value measurement | Level 2 | Payments due to vendors (earnout agreements) | Held at fair value through profit or loss |  |
Disclosure of detailed information about financial instruments [line items] |  |
Liabilities | 0.0 |
Recurring fair value measurement | Level 2 | Liabilities in respect of put options | Held at fair value through profit or loss |  |
Disclosure of detailed information about financial instruments [line items] |  |
Liabilities | 0.0 |
Recurring fair value measurement | Level 2 | Derivatives | Held at fair value through profit or loss |  |
Disclosure of detailed information about financial instruments [line items] |  |
Assets | 2.2 |
Recurring fair value measurement | Level 3 | Held at fair value through profit or loss |  |
Disclosure of detailed information about financial instruments [line items] |  |
Other investments | 241.1 |
Recurring fair value measurement | Level 3 | Held at fair value through other comprehensive income |  |
Disclosure of detailed information about financial instruments [line items] |  |
Other investments | 112.2 |
Recurring fair value measurement | Level 3 | Derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Liabilities | 0.0 |
Recurring fair value measurement | Level 3 | Derivatives | Held at fair value through profit or loss |  |
Disclosure of detailed information about financial instruments [line items] |  |
Liabilities | 0.0 |
Recurring fair value measurement | Level 3 | Payments due to vendors (earnout agreements) | Held at fair value through profit or loss |  |
Disclosure of detailed information about financial instruments [line items] |  |
Liabilities | (173.1) |
Recurring fair value measurement | Level 3 | Liabilities in respect of put options | Held at fair value through profit or loss |  |
Disclosure of detailed information about financial instruments [line items] |  |
Liabilities | (397.8) |
Recurring fair value measurement | Level 3 | Derivatives | Held at fair value through profit or loss |  |
Disclosure of detailed information about financial instruments [line items] |  |
Assets | £ 0.0 |

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