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Interests in associates, joint ventures and other investments - Principal Associates and Joint Ventures (Detail) | 12 Months Ended
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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%

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- 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 -Paragraph 16 -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2019-en-r&anchor=para_16_b_ii&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2019-01-01 -Paragraph 17 -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2019-en-r&anchor=para_17_b_ii&doctype=Standard -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2019-01-01 -Paragraph 21 -Subparagraph a -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_21_a_iii&doctype=Standard -URIDate 2019-03-27 + Details
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Data Type: | xbrli:stringItemType
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Period Type: | duration

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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 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2019-en-r&anchor=para_17_b_iii&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2019-01-01 -Paragraph 16 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2019-en-r&anchor=para_16_b_iii&doctype=Standard -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2019-01-01 -Paragraph 21 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_21_a_iv&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Disclosure of principal associates and joint ventures. + References No definition available. + Details
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