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Business Combinations (Details) - USD ($)
$ in Millions
 3 Months Ended
Nov. 26, 2025
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Liabilities Assumed [Abstract]          
Goodwill   $ 18,733.9 $ 10,781.5 $ 18,641.4 $ 10,677.4
Intangible assets, Gross Carrying Value   5,959.4   6,004.2  
Integration and acquisition related costs   59.4 $ 33.8    
Trade Names          
Liabilities Assumed [Abstract]          
Intangible assets, Gross Carrying Value   926.0   929.9  
Customer Relationships          
Liabilities Assumed [Abstract]          
Intangible assets, Gross Carrying Value   4,374.0   4,389.5  
Technology and Other          
Liabilities Assumed [Abstract]          
Intangible assets, Gross Carrying Value   355.6   $ 409.2  
IPG          
Business Combination [Line Items]          
Omnicom shares issued, IPG acquisition 124,352,188        
Purchase Consideration [Abstract]          
Fair value of shares issued to IPG shareholders1 $ 8,891.2        
Cash paid for fractional shares 0.3        
Fair value of equity awards2 2.0        
Total Consideration 8,893.5        
Assets Acquired [Abstract]          
Cash and Cash equivalents 1,080.6        
Accounts receivable 5,753.5        
Work in process 2,227.6        
Assets held for sale 264.7        
Other current Assets 571.6        
Property and equipment 251.6        
Operating lease right-of-use assets 597.9        
Equity Method Investments 41.8        
Intangible assets 4,591.4        
Other Assets 701.3        
Total Assets 16,082.0        
Liabilities Assumed [Abstract]          
Accounts payable 7,065.4        
Customer advances 715.8        
Short-term debt 42.4        
Liabilities held for sale 106.5        
Other current liabilities 1,673.8        
Long-term liabilities 432.7        
Long-term liability - operating leases 876.4        
Long-term debt 2,764.9        
Deferred tax liabilities, net 1,093.4        
Non-controlling interests 211.7        
Redeemable non-controlling interest 11.2        
Total Liabilities and Non-controlling interest 14,994.2        
Fair value of net assets acquired 1,087.8        
Goodwill $ 7,805.7        
IPG | Trade Names          
Liabilities Assumed [Abstract]          
Intangible assets, Gross Carrying Value   792.0      
IPG | Customer Relationships          
Liabilities Assumed [Abstract]          
Intangible assets, Gross Carrying Value   3,616.0      
IPG | Technology and Other          
Liabilities Assumed [Abstract]          
Intangible assets, Gross Carrying Value   $ 183.4