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Repositioning Costs	6 Months Ended
Repositioning Costs	Jun. 30, 2025
Repositioning Costs [Abstract]
Repositioning Costs	Repositioning Costs In connection with our strategic initiatives, operating expenses for the three and six months ended June 30, 2025 included $88.8 million ($67.2 million after-tax) of repositioning costs, primarily related to severance actions related to efficiency initiatives, primarily within the Omnicom Advertising Group and the Omnicom Production Group. In connection with our strategic initiatives, operating expenses for the three and six months ended June 30, 2024 included $57.8 million ($42.9 million after-tax), primarily related to severance actions related to ongoing efficiency initiatives, including strategic agency consolidation in our smaller international markets and the launch of our centralized production strategy.