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Deferred tax - Analysis of Deferred Tax Balances for Financial Reporting Purposes (Detail) - GBP (£)
£ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets gross £ 430.9 £ 412.0  
Deferred tax assets, offset (243.0) (259.0)  
Deferred tax assets [1] 187.9 153.0 £ 160.3
Deferred tax liabilities gross (622.8) (738.5)  
Deferred tax liabilities, offset 243.0 259.0  
Deferred tax liabilities [1] (379.8) (479.5) £ (513.7)
Deferred tax assets (liabilities) £ (191.9) £ (326.5)  
[1] Figures have been restated, as described in the accounting policies.