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Related party transactions (Tables)
6 Months Ended
Jun. 30, 2020
Disclosure of transactions between related parties [abstract]  
Summary of related party transactions outstanding
The following amounts were outstanding at 30 June 2020:
 
    
30 June
2020
   
30 June
2019
   
31 December
2019
 
    
£m
   
£m
   
£m
 
Amounts owed by related parties
      
Kantar
   79.2    —      87.5 
Other
   27.8    82.7    87.5 
    107.0    82.7    175.0 
Amounts owed to related parties
      
Kantar
   (14.6   —      (36.5
Other
   (61.9   (56.0   (49.6
    (76.5   (56.0   (86.1