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Sources of finance - Analysis of Future Anticipated Cash Flows Related of Financial Derivatives (Detail) - GBP (£)
£ in Millions
Dec. 31, 2018
Dec. 31, 2017
Trade and Other Payable [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Future anticipated cash flows, Financial liabilities £ 1,376.2 £ 683.9
Future anticipated cash flows, Financial assets 632.5 1,053.5
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 229.3 97.8
Future anticipated cash flows, Financial assets 124.6 123.7
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 50.0 21.4
Future anticipated cash flows, Financial assets 11.8 38.6
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 688.4 20.5
Future anticipated cash flows, Financial assets 11.5 39.5
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 408.5 20.7
Future anticipated cash flows, Financial assets 11.6 851.7
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   523.5
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 assets 461.4  
Trade and other receivable [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Future anticipated cash flows, Financial liabilities 1,359.1 675.3
Future anticipated cash flows, Financial assets 644.8 1,057.2
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 221.9 96.7
Future anticipated cash flows, Financial assets 120.6 128.8
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 45.3 20.1
Future anticipated cash flows, Financial assets 6.5 38.8
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 685.3 18.8
Future anticipated cash flows, Financial assets 6.4 38.6
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 406.6 18.6
Future anticipated cash flows, Financial assets 6.5 851.0
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   £ 521.1
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 assets £ 498.2