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Revenue (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Disaggregation of Revenue [Line Items]      
REVENUE $ 3,630.5 $ 3,443.3  
Media and production costs 788.8 710.9 $ 664.4
Unbilled fees and costs and contract assets 922.8 798.0 678.1
Contract assets: 1,711.6 1,508.9 1,342.5
Customer advances 1,238.2 1,279.6 $ 1,356.2
North America      
Disaggregation of Revenue [Line Items]      
REVENUE 2,040.9 1,926.8  
UNITED STATES      
Disaggregation of Revenue [Line Items]      
REVENUE 1,925.9 1,812.2  
Latin America      
Disaggregation of Revenue [Line Items]      
REVENUE 96.5 74.0  
Europe      
Disaggregation of Revenue [Line Items]      
REVENUE 1,005.8 951.9  
Middle East and Africa      
Disaggregation of Revenue [Line Items]      
REVENUE 79.6 84.9  
Asia-Pacific      
Disaggregation of Revenue [Line Items]      
REVENUE 407.7 405.7  
Advertising & Media      
Disaggregation of Revenue [Line Items]      
REVENUE 1,906.8 1,776.5  
Precision Marketing      
Disaggregation of Revenue [Line Items]      
REVENUE 438.2 360.0  
Public Relations      
Disaggregation of Revenue [Line Items]      
REVENUE 390.3 375.5  
Healthcare      
Disaggregation of Revenue [Line Items]      
REVENUE 323.6 318.4  
Branding & Retail Commerce      
Disaggregation of Revenue [Line Items]      
REVENUE 200.2 209.6  
Experiential      
Disaggregation of Revenue [Line Items]      
REVENUE 159.9 147.8  
Execution & Support      
Disaggregation of Revenue [Line Items]      
REVENUE $ 211.5 $ 255.5