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Sources of finance - Analysis of Future Anticipated Cash Flows Related of Financial Derivatives (Detail) - GBP (£)
£ in Millions
Dec. 31, 2019
Dec. 31, 2018
Trade and Other Payable [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Future anticipated cash flows, Financial liabilities £ 615.9 £ 1,376.2
Future anticipated cash flows, Financial assets 44.0 632.5
Trade and Other Payable [member] | Within one year [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Future anticipated cash flows, Financial liabilities 113.6 229.3
Future anticipated cash flows, Financial assets 44.0 124.6
Trade and Other Payable [member] | Between one and two years [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Future anticipated cash flows, Financial liabilities 17.5 50.0
Future anticipated cash flows, Financial assets   11.8
Trade and Other Payable [member] | Between two and three years [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Future anticipated cash flows, Financial liabilities 11.8 688.4
Future anticipated cash flows, Financial assets   11.5
Trade and Other Payable [member] | Between three and four years [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Future anticipated cash flows, Financial liabilities 11.6 408.5
Future anticipated cash flows, Financial assets   11.6
Trade and Other Payable [member] | Between four and five years [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Future anticipated cash flows, Financial liabilities 11.6  
Future anticipated cash flows, Financial assets   11.6
Trade and Other Payable [member] | Over five years [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Future anticipated cash flows, Financial liabilities 449.8  
Future anticipated cash flows, Financial assets   461.4
Trade and other receivable [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Future anticipated cash flows, Financial liabilities 593.4 1,359.1
Future anticipated cash flows, Financial assets 45.0 644.8
Trade and other receivable [member] | Within one year [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Future anticipated cash flows, Financial liabilities 107.8 221.9
Future anticipated cash flows, Financial assets 45.0 120.6
Trade and other receivable [member] | Between one and two years [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Future anticipated cash flows, Financial liabilities 10.9 45.3
Future anticipated cash flows, Financial assets   6.5
Trade and other receivable [member] | Between two and three years [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Future anticipated cash flows, Financial liabilities 6.2 685.3
Future anticipated cash flows, Financial assets   6.4
Trade and other receivable [member] | Between three and four years [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Future anticipated cash flows, Financial liabilities 6.1 406.6
Future anticipated cash flows, Financial assets   6.5
Trade and other receivable [member] | Between four and five years [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Future anticipated cash flows, Financial liabilities 6.1  
Future anticipated cash flows, Financial assets   6.6
Trade and other receivable [member] | Over five years [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Future anticipated cash flows, Financial liabilities £ 456.3  
Future anticipated cash flows, Financial assets   £ 498.2