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Goodwill and acquisitions - Summary of Movements in the Impairment Charge from a Reasonably Possible Change in Assumptions (Detail) £ in Millions | 6 Months Ended
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Jun. 30, 2020 GBP (£)
Summary of Movements in the Impairment Charge from A Reasonably Possible Change In These Assumptions [Line Items] |
Impact ​of change ​in revenue less pass-through costs growth rate ​on impairment ​charges | £ 52.3
Impact ​of change ​in operating ​margin ​percentage ​on impairment ​charges | 198.1
Impact of change in long-term cash flow growth rate on impairment charges | 147.9
Increase [member] |
Summary of Movements in the Impairment Charge from A Reasonably Possible Change In These Assumptions [Line Items] |
Impact of change to pre-tax discount rate on impairment charges | (591.2)
Decrease [member] |
Summary of Movements in the Impairment Charge from A Reasonably Possible Change In These Assumptions [Line Items] |
Impact of change to pre-tax discount rate on impairment charges | 765.7
Wunderman Thompson [member] |
Summary of Movements in the Impairment Charge from A Reasonably Possible Change In These Assumptions [Line Items] |
Impact ​of change ​in revenue less pass-through costs growth rate ​on impairment ​charges | 19.2
Impact ​of change ​in operating ​margin ​percentage ​on impairment ​charges | 70.8
Impact of change in long-term cash flow growth rate on impairment charges | 54.6
Wunderman Thompson [member] | Increase [member] |
Summary of Movements in the Impairment Charge from A Reasonably Possible Change In These Assumptions [Line Items] |
Impact of change to pre-tax discount rate on impairment charges | (210.2)
Wunderman Thompson [member] | Decrease [member] |
Summary of Movements in the Impairment Charge from A Reasonably Possible Change In These Assumptions [Line Items] |
Impact of change to pre-tax discount rate on impairment charges | 279.4
VMLY&R [member] |
Summary of Movements in the Impairment Charge from A Reasonably Possible Change In These Assumptions [Line Items] |
Impact ​of change ​in revenue less pass-through costs growth rate ​on impairment ​charges | 8.3
Impact ​of change ​in operating ​margin ​percentage ​on impairment ​charges | 37.7
Impact of change in long-term cash flow growth rate on impairment charges | 22.9
VMLY&R [member] | Increase [member] |
Summary of Movements in the Impairment Charge from A Reasonably Possible Change In These Assumptions [Line Items] |
Impact of change to pre-tax discount rate on impairment charges | (100.1)
VMLY&R [member] | Decrease [member] |
Summary of Movements in the Impairment Charge from A Reasonably Possible Change In These Assumptions [Line Items] |
Impact of change to pre-tax discount rate on impairment charges | 132.0
Burson Cohn & Wolfe [member] |
Summary of Movements in the Impairment Charge from A Reasonably Possible Change In These Assumptions [Line Items] |
Impact ​of change ​in revenue less pass-through costs growth rate ​on impairment ​charges | 9.6
Impact ​of change ​in operating ​margin ​percentage ​on impairment ​charges | 21.8
Impact of change in long-term cash flow growth rate on impairment charges | 26.9
Burson Cohn & Wolfe [member] | Increase [member] |
Summary of Movements in the Impairment Charge from A Reasonably Possible Change In These Assumptions [Line Items] |
Impact of change to pre-tax discount rate on impairment charges | (98.7)
Burson Cohn & Wolfe [member] | Decrease [member] |
Summary of Movements in the Impairment Charge from A Reasonably Possible Change In These Assumptions [Line Items] |
Impact of change to pre-tax discount rate on impairment charges | 129.1
Geometry Global [member] |
Summary of Movements in the Impairment Charge from A Reasonably Possible Change In These Assumptions [Line Items] |
Impact ​of change ​in revenue less pass-through costs growth rate ​on impairment ​charges | 1.2
Impact ​of change ​in operating ​margin ​percentage ​on impairment ​charges | 13.5
Impact of change in long-term cash flow growth rate on impairment charges | 3.6
Geometry Global [member] | Increase [member] |
Summary of Movements in the Impairment Charge from A Reasonably Possible Change In These Assumptions [Line Items] |
Impact of change to pre-tax discount rate on impairment charges | (22.3)
Geometry Global [member] | Decrease [member] |
Summary of Movements in the Impairment Charge from A Reasonably Possible Change In These Assumptions [Line Items] |
Impact of change to pre-tax discount rate on impairment charges | 29.7
Landor And Fitch [member] |
Summary of Movements in the Impairment Charge from A Reasonably Possible Change In These Assumptions [Line Items] |
Impact ​of change ​in revenue less pass-through costs growth rate ​on impairment ​charges | 2.1
Impact ​of change ​in operating ​margin ​percentage ​on impairment ​charges | 6.5
Impact of change in long-term cash flow growth rate on impairment charges | 6.0
Landor And Fitch [member] | Increase [member] |
Summary of Movements in the Impairment Charge from A Reasonably Possible Change In These Assumptions [Line Items] |
Impact of change to pre-tax discount rate on impairment charges | (23.5)
Landor And Fitch [member] | Decrease [member] |
Summary of Movements in the Impairment Charge from A Reasonably Possible Change In These Assumptions [Line Items] |
Impact of change to pre-tax discount rate on impairment charges | 31.3
Other [member] |
Summary of Movements in the Impairment Charge from A Reasonably Possible Change In These Assumptions [Line Items] |
Impact ​of change ​in revenue less pass-through costs growth rate ​on impairment ​charges | 11.9
Impact ​of change ​in operating ​margin ​percentage ​on impairment ​charges | 47.8
Impact of change in long-term cash flow growth rate on impairment charges | 33.9
Other [member] | Increase [member] |
Summary of Movements in the Impairment Charge from A Reasonably Possible Change In These Assumptions [Line Items] |
Impact of change to pre-tax discount rate on impairment charges | (136.4)
Other [member] | Decrease [member] |
Summary of Movements in the Impairment Charge from A Reasonably Possible Change In These Assumptions [Line Items] |
Impact of change to pre-tax discount rate on impairment charges | £ 164.2

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