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Other reserves - Summary of Other Reserves (Detail) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of reserves within equity [line items]      
Beginning balance [1] £ 962.4 £ 1,119.1  
Exchange adjustments recycled to the income statement on disposal of discontinued operations [1] (284.0)    
Share cancellations [1] (47.7)    
Exchange adjustments on foreign currency net investments [1] (625.1) 284.0 £ (659.8)
Gain (loss) on revaluation of available for sale investments [1]     32.1
Recognition and remeasurement of financial instruments [1] 23.7 (13.9) (20.4)
Share purchases – close period commitments [1],[2] (252.3)    
Ending balance [1] (169.9) 962.4 1,119.1
Capital redemption reserve [member]      
Disclosure of reserves within equity [line items]      
Beginning balance 2.7 2.7 2.7
Share cancellations 0.5    
Ending balance 3.2 2.7 2.7
Equity reserve [member]      
Disclosure of reserves within equity [line items]      
Beginning balance [3] (236.4) (212.1) (203.4)
Recognition and remeasurement of financial instruments [3] 10.6 (24.3) (8.7)
Share purchases – close period commitments [3] (252.3)    
Ending balance [3] (478.1) (236.4) (212.1)
Revaluation reserve [member]      
Disclosure of reserves within equity [line items]      
Beginning balance   303.4 271.3
Gain (loss) on revaluation of available for sale investments     32.1
Accounting policy change (IFRS 9) [1]   (303.4)  
Ending balance     303.4
Translation reserve [member]      
Disclosure of reserves within equity [line items]      
Beginning balance [1] 1,196.1 1,025.1 1,665.2
Exchange adjustments recycled to the income statement on disposal of discontinued operations [1] (284.0)    
Exchange adjustments on foreign currency net investments [1] (607.1) 275.0 (640.1)
Accounting policy change (IFRS 9) [1]   (104.0)  
Ending balance [1] 305.0 1,196.1 1,025.1
Other reserves [member]      
Disclosure of reserves within equity [line items]      
Beginning balance 962.4 1,119.1 1,735.8
Exchange adjustments recycled to the income statement on disposal of discontinued operations [1] (284.0)    
Share cancellations [1] 0.5    
Exchange adjustments on foreign currency net investments [1] (607.1) 275.0 (640.1)
Gain (loss) on revaluation of available for sale investments [1]     32.1
Accounting policy change (IFRS 9) [1]   (407.4)  
Recognition and remeasurement of financial instruments [1] 10.6 (24.3) (8.7)
Share purchases – close period commitments [1],[2] (252.3)    
Ending balance £ (169.9) £ 962.4 £ 1,119.1
[1] Figures have been restated, as described in the accounting policies.
[2] During 2019, the Company entered into an arrangement with a third party to conduct share buybacks on its behalf in the close period commencing on 2 January 2020 and ending on 27 February 2020, in accordance with UK listing rules. The commitment resulting from this agreement constitutes a liability at 31 December 2019, which is included in Trade and other payables: amounts falling due within one year and has been recognised as a movement in equity.
[3] Figures have been restated to be in accordance with IAS 39 Financial Instruments: Recognition and Measurement, as described in the accounting policies.