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Related party transactions - Additional Information (Detail) - GBP (£)
£ in Millions

6 Months Ended

12 Months Ended

Jun. 30, 2020

Jun. 30, 2019

^[2]

Dec. 31, 2019

Disclosure of transactions between related parties [line items]

Revenue

^[1]

£ 5,582.7

£ 6,368.2

£ 13,234.1

Country US [Member] | Compas [Member]

Disclosure of transactions between related parties [line items]

Revenue

£ 49.7

[1]	Figures have been restated as described in the accounting policies.
[2]	Figures for the period ended 30 June 2019 have been re-presented in accordance with IFRS 5: Non-current Assets Held for Sale and Discontinued Operations, as described in note 13.

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Expiry date 2020-01-01: The income arising in the course of an entity's ordinary activities. Income is increases in economic benefits during the accounting period in the form of inflows or enhancements of assets or decreases of liabilities that result in an increase in equity, other than those relating to contributions from equity participants. Effective 2020-01-01: The income arising in the course of an entity's ordinary activities. Income is increases in assets, or decreases in liabilities, that result in increases in equity, other than those relating to contributions from holders of equity claims.

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