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Leases - Summary of Movement in Right of use Assets and Lease Liabilities (Detail) - GBP (£)
£ in Millions
 6 Months Ended
Jun. 30, 2019
Jan. 01, 2019
Disclosure Of Leases [Line items]    
Additions £ 119.0  
Disposals and deletions (20.5)  
Depreciation expenses (168.4)  
Right-of-use assets 1,825.2  
Additions 144.6  
Interest expense related to lease liabilities 51.7  
Disposals (21.3)  
Repayment of lease liabilities (including interest) (155.5)  
Lease liabilities 2,345.7  
Impact on Initial Application of IFRS16 [member]    
Disclosure Of Leases [Line items]    
Right-of-use assets   £ 1,895.1
Lease liabilities   2,326.2
Land and buildings [member]    
Disclosure Of Leases [Line items]    
Additions 109.6  
Disposals and deletions (20.3)  
Depreciation expenses (158.5)  
Right-of-use assets 1,793.3  
Additions 136.7  
Interest expense related to lease liabilities 51.1  
Disposals (21.0)  
Repayment of lease liabilities (including interest) (148.4)  
Lease liabilities 2,312.8  
Land and buildings [member] | Impact on Initial Application of IFRS16 [member]    
Disclosure Of Leases [Line items]    
Right-of-use assets   1,862.5
Lease liabilities   2,294.4
Plant and machinery [member]    
Disclosure Of Leases [Line items]    
Additions 9.4  
Disposals and deletions (0.2)  
Depreciation expenses (9.9)  
Right-of-use assets 31.9  
Additions 7.9  
Interest expense related to lease liabilities 0.6  
Disposals (0.3)  
Repayment of lease liabilities (including interest) (7.1)  
Lease liabilities £ 32.9  
Plant and machinery [member] | Impact on Initial Application of IFRS16 [member]    
Disclosure Of Leases [Line items]    
Right-of-use assets   32.6
Lease liabilities   £ 31.8