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Costs of services and general and administrative costs - Additional Information (Detail) - GBP (£)
£ in Millions
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Sep. 30, 2018
Dec. 31, 2018
Disclosure Of Information About Operating Cost [line items]          
Gains on disposal of investments and subsidiaries   £ 40.6 £ 189.9   £ 235.5
Restructuring and transformation costs £ 234.0 55.4 45.5 £ 68.3 302.3
Litigation Settlement   16.8      
Proceeds from sale of freehold property   £ 159.0      
Lease Term   15 years      
Net gain from sale and leaseback   £ 7.9      
Impairment Charge         126.1
Goodwill impairment         183.9
Restructuring Cost [member]          
Disclosure Of Information About Operating Cost [line items]          
Restructuring and transformation costs   48.2 45.5   210.3
Transformation cost [member]          
Disclosure Of Information About Operating Cost [line items]          
Restructuring and transformation costs   7.2     92.0
Chime Communications Ltd [member]          
Disclosure Of Information About Operating Cost [line items]          
Gains on disposal of investments and subsidiaries   28.6      
Globant S.A. [member]          
Disclosure Of Information About Operating Cost [line items]          
Gains on disposal of investments and subsidiaries     £ 185.3    
Investor Day In December 2018 Restructuring and Transformation Plan [member] | Restructuring Cost [member]          
Disclosure Of Information About Operating Cost [line items]          
Restructuring and transformation costs   £ 36.1      
Brand names [member]          
Disclosure Of Information About Operating Cost [line items]          
Impairment Charge         58.6
Customer Relationship [member]          
Disclosure Of Information About Operating Cost [line items]          
Impairment Charge         67.5
Goodwill [member]          
Disclosure Of Information About Operating Cost [line items]          
Impairment Charge         183.9
Goodwill [member] | VMLY&R [member]          
Disclosure Of Information About Operating Cost [line items]          
Goodwill impairment         148.0
Other business [member]          
Disclosure Of Information About Operating Cost [line items]          
Goodwill impairment         £ 35.9