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Revenue (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disaggregation of Revenue [Line Items]      
Revenue $ 15,689.1 $ 14,692.2 $ 14,289.1
Media and production costs 864.0 664.4  
Unbilled fees and costs and contract assets 758.2 678.1  
Work in process 1,622.2 1,342.5  
Customer advances 1,336.1 1,356.2  
North America      
Disaggregation of Revenue [Line Items]      
Revenue 8,650.2 7,951.0 7,856.0
UNITED STATES      
Disaggregation of Revenue [Line Items]      
Revenue 8,186.5 7,471.6 7,367.3
Latin America      
Disaggregation of Revenue [Line Items]      
Revenue 433.7 386.8 329.0
Europe      
Disaggregation of Revenue [Line Items]      
Revenue 4,439.0 4,266.9 4,010.5
Middle East and Africa      
Disaggregation of Revenue [Line Items]      
Revenue 319.2 309.6 346.7
Asia-Pacific      
Disaggregation of Revenue [Line Items]      
Revenue 1,847.0 1,777.9 1,746.9
Media & Advertising      
Disaggregation of Revenue [Line Items]      
Revenue 8,466.2 7,891.2 7,433.9
Precision Marketing      
Disaggregation of Revenue [Line Items]      
Revenue 1,820.9 1,473.5 1,426.6
Public Relations      
Disaggregation of Revenue [Line Items]      
Revenue 1,679.2 1,578.9 1,552.7
Healthcare      
Disaggregation of Revenue [Line Items]      
Revenue 1,354.7 1,362.7 1,322.3
Branding & Retail Commerce      
Disaggregation of Revenue [Line Items]      
Revenue 792.9 853.7 848.1
Experiential      
Disaggregation of Revenue [Line Items]      
Revenue 731.5 651.4 635.6
Execution & Support      
Disaggregation of Revenue [Line Items]      
Revenue $ 843.7 $ 880.8 $ 1,069.9