Merger Agreement (Details)	12 Months Ended
Dec. 31, 2024 USD ($)
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]
Conversion of Stock, Amount Converted	$ 0.344
Gain (Loss) on Contract Termination	439,000,000.0
Loss on Contract Termination	25,000,000.0
Business Acquisition, Transaction Costs	$ 9,300,000
Percentage of Voting Interests in Post-Merger entity - IPG Shareholders	39.40%
Percentage of Voting Interests in Post-Merger entity - Omnicom Shareholders	60.60%

Percentage of Voting Interests in Post-Merger entity - IPG Shareholders

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Percentage of Voting Interests in Post-Merger entity - Omnicom Shareholders

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Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition.

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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.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 230
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-Section 50
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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.

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The loss recognized on termination of a contract.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 912
-SubTopic 275
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
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