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Planned Acquisition of IPG by Omnicom (Details) | 3 Months Ended
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Mar. 31, 2025 USD ($)
Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] |
Conversion of Stock, Amount Converted | $ 0.344
Percentage of Voting Interests in Post-Merger entity - Omnicom Shareholders | 60.60%
Percentage of Voting Interests in Post-Merger entity - IPG Shareholders | 39.40%
Gain (Loss) on Contract Termination | $ 439,000,000.0
Business Combination, Transaction Cost, Excluding Separately Recognized Transaction | $ 4,800,000

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- Definition Percentage of Voting Interests in Post-Merger entity - IPG Shareholders + References No definition available. + Details
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- Definition Percentage of Voting Interests in Post-Merger entity - Omnicom Shareholders + References No definition available. + Details
Name: | ipg_PercentageOfVotingInterestsInPostMergerEntityOmnicomShareholders
Namespace Prefix: | ipg_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount of transaction cost incurred to effect business combination. Excludes separately recognized transaction and indirect cost. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479328/805-10-50-7 + Details
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- Definition The value of the stock converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-3 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-5 + Details
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- Definition Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 + Details
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