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Analysis of cash flows - Summary of Analysis of Cash Flows (Parenthetical) (Detail) - Dec. 31, 2018
EUR (€)
USD ($)
GBP (£)
Disclosure Of Cash Flow Statement [line items]      
Cash and cash equivalents acquired from acquisitions     £ 11,300,000
Cash and cash equivalents acquired from disposals     15,100,000
Bond amount     8,357,600,000
Proceeds from issue of EURO 250 million bonds [member]      
Disclosure Of Cash Flow Statement [line items]      
Bond amount | € € 250,000,000    
Proceeds from issue of EURO 500 million bonds [member]      
Disclosure Of Cash Flow Statement [line items]      
Bond amount | € 500,000,000    
Repayment of EURO 252 million bonds [member]      
Disclosure Of Cash Flow Statement [line items]      
Bond amount | € 252,000,000    
Partial repayment of USD 300 million bonds [member]      
Disclosure Of Cash Flow Statement [line items]      
Bond amount | $   $ 300,000,000  
Partial repayment of USD 500 million bonds [member]      
Disclosure Of Cash Flow Statement [line items]      
Bond amount | $   $ 500,000,000  
Repayment of GBP 400 million bonds [member]      
Disclosure Of Cash Flow Statement [line items]      
Bond amount     400,000,000
Proceeds from issue of GBP 400 million bonds [member]      
Disclosure Of Cash Flow Statement [line items]      
Bond amount     £ 400,000,000
Repayment of EUR 498 million bonds [member]      
Disclosure Of Cash Flow Statement [line items]      
Bond amount | € € 498,000,000