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Provisions for liabilities and charges - Summary of Provisions for Liabilities and Charges (Detail) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Noncurrent Provisions [line items]    
Beginning balance £ 229.0 £ 227.9
Charged to the income statement 86.0 21.0
Acquisitions 8.8 26.8
Utilised (25.8) (27.4)
Released to the income statement (10.3) (11.4)
Transfers 12.9 7.2
Exchange adjustments 11.1 (15.1)
Ending balance 311.7 229.0
Property [Member]    
Disclosure Of Noncurrent Provisions [line items]    
Beginning balance 52.6 58.5
Charged to the income statement 72.1 4.1
Acquisitions 0.5 4.0
Utilised (5.7) (6.0)
Released to the income statement (5.7) (5.5)
Transfers 2.0 0.1
Exchange adjustments 2.9 (2.6)
Ending balance 118.7 52.6
Other [member]    
Disclosure Of Noncurrent Provisions [line items]    
Beginning balance 176.4 169.4
Charged to the income statement 13.9 16.9
Acquisitions 8.3 22.8
Utilised (20.1) (21.4)
Released to the income statement (4.6) (5.9)
Transfers 10.9 7.1
Exchange adjustments 8.2 (12.5)
Ending balance £ 193.0 £ 176.4