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Interests in associates, joint ventures and other investments - Principal Associates and Joint Ventures (Detail)	12 Months Ended
	Dec. 31, 2019
Barrows Design and Manufacturing (Pty) Limited [member]
Disclosure of principal associates and joint ventures [line items]
Associate, Country of incorporation	South Africa
Associate, % owned	35.00%
Dat Viet VAC Media Corporation [member]
Disclosure of principal associates and joint ventures [line items]
Associate, Country of incorporation	Vietnam
Associate, % owned	30.00%
GIIR Inc [member]
Disclosure of principal associates and joint ventures [line items]
Associate, Country of incorporation	Korea
Associate, % owned	30.00%
Haworth Marketing & Media Company [member]
Disclosure of principal associates and joint ventures [line items]
Associate, Country of incorporation	USA
Associate, % owned	49.00%
High Co SA [member]
Disclosure of principal associates and joint ventures [line items]
Associate, Country of incorporation	France
Associate, % owned	34.10%
Joye Media SL [member]
Disclosure of principal associates and joint ventures [line items]
Associate, Country of incorporation	Spain
Associate, % owned	22.50%
Nanjing Yindu Ogilvy Advertising Co. Ltd [member]
Disclosure of principal associates and joint ventures [line items]
Associate, Country of incorporation	China
Associate, % owned	49.00%
Smollan Holdings (Pty) Ltd. [member]
Disclosure of principal associates and joint ventures [line items]
Associate, Country of incorporation	South Africa
Associate, % owned	24.80%
Summer (BC) JVCo S.a r.l. [member]
Disclosure of principal associates and joint ventures [line items]
Associate, Country of incorporation	Luxembourg
Associate, % owned	40.00%
Summer (BC) US JVCo SCSp [member]
Disclosure of principal associates and joint ventures [line items]
Associate, Country of incorporation	Luxembourg
Associate, % owned	40.00%

X

- Definition

The country in which an associate of the entity is incorporated. [Refer: Associates [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2019-01-01
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-IssueDate 2019-01-01
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- Definition

The proportion of ownership interest in an associate attributable to the entity. [Refer: Associates [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2019-01-01
-Paragraph 17
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-URIDate 2019-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Number 27
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

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