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Costs of services and general and administrative costs - Minimum Committed Annual Rentals (Detail) - GBP (£)
£ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of finance lease and operating lease by lessee [line items]      
Amounts payable   £ 4,262.6  
Within one year [member]      
Disclosure of finance lease and operating lease by lessee [line items]      
Amounts payable   612.4  
Over five years [member]      
Disclosure of finance lease and operating lease by lessee [line items]      
Amounts payable   2,074.1  
Plant and machinery [member]      
Disclosure of finance lease and operating lease by lessee [line items]      
Amounts payable   16.0 £ 14.5
Plant and machinery [member] | Entering into significant commitments or contingent liabilities [member]      
Disclosure of finance lease and operating lease by lessee [line items]      
Amounts payable £ 23.2    
Plant and machinery [member] | Within one year [member]      
Disclosure of finance lease and operating lease by lessee [line items]      
Amounts payable   5.1 4.0
Plant and machinery [member] | Within one year [member] | Entering into significant commitments or contingent liabilities [member]      
Disclosure of finance lease and operating lease by lessee [line items]      
Amounts payable 3.6    
Plant and machinery [member] | Later than two years and not later than five years [member]      
Disclosure of finance lease and operating lease by lessee [line items]      
Amounts payable   10.8 10.5
Plant and machinery [member] | Later than two years and not later than five years [member] | Entering into significant commitments or contingent liabilities [member]      
Disclosure of finance lease and operating lease by lessee [line items]      
Amounts payable 19.2    
Plant and machinery [member] | Over five years [member]      
Disclosure of finance lease and operating lease by lessee [line items]      
Amounts payable   0.1  
Plant and machinery [member] | Over five years [member] | Entering into significant commitments or contingent liabilities [member]      
Disclosure of finance lease and operating lease by lessee [line items]      
Amounts payable 0.4    
Land and buildings [member]      
Disclosure of finance lease and operating lease by lessee [line items]      
Amounts payable   532.6 560.0
Land and buildings [member] | Entering into significant commitments or contingent liabilities [member]      
Disclosure of finance lease and operating lease by lessee [line items]      
Amounts payable 589.2    
Land and buildings [member] | Within one year [member]      
Disclosure of finance lease and operating lease by lessee [line items]      
Amounts payable   88.6 85.1
Land and buildings [member] | Within one year [member] | Entering into significant commitments or contingent liabilities [member]      
Disclosure of finance lease and operating lease by lessee [line items]      
Amounts payable 70.2    
Land and buildings [member] | Later than two years and not later than five years [member]      
Disclosure of finance lease and operating lease by lessee [line items]      
Amounts payable   236.2 287.9
Land and buildings [member] | Later than two years and not later than five years [member] | Entering into significant commitments or contingent liabilities [member]      
Disclosure of finance lease and operating lease by lessee [line items]      
Amounts payable 272.7    
Land and buildings [member] | Over five years [member]      
Disclosure of finance lease and operating lease by lessee [line items]      
Amounts payable   £ 207.8 £ 187.0
Land and buildings [member] | Over five years [member] | Entering into significant commitments or contingent liabilities [member]      
Disclosure of finance lease and operating lease by lessee [line items]      
Amounts payable £ 246.3