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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

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