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Revenue (Tables)
 9 Months Ended
Sep. 30, 2025
Disaggregation of Revenue [Line Items]  
Contract Balances
September 30, 2025December 31, 2024September 30, 2024
Work in process:
Media and production costs$908.3 $864.0 $881.1 
Unbilled fees and costs and contract assets1,115.2 758.2 1,017.3 
Work in process$2,023.5 $1,622.2 $1,898.4 
Customer advances$1,273.0 $1,336.1 $1,303.2 
Geographic Markets [Member]  
Disaggregation of Revenue [Line Items]  
Disaggregation of Revenue
Revenue by geographic market:
Three Months Ended September 30,
Nine Months Ended September 30,
2025202420252024
Americas:
North America$2,245.3 $2,154.0 $6,566.5 $6,343.3 
Latin America126.4 99.7 337.4 302.6 
EMEA:
Europe1,135.4 1,080.8 3,296.8 3,188.5 
Middle East and Africa67.4 63.3 204.3 208.5 
Asia-Pacific462.6 484.8 1,338.1 1,324.0 
Revenue$4,037.1 $3,882.6 $11,743.1 $11,366.9 
Discipline [Member]  
Disaggregation of Revenue [Line Items]  
Disaggregation of Revenue
Revenue by discipline:
Three Months Ended September 30,
Nine Months Ended September 30,
2025202420252024
Media & Advertising$2,353.8 $2,129.0 $6,693.3 $6,184.2 
Precision Marketing462.5 450.6 1,369.9 1,303.1 
Public Relations377.2 404.0 1,112.8 1,195.3 
Healthcare331.2 337.1 969.5 999.1 
Branding & Retail Commerce144.8 181.7 452.9 549.3 
Experiential152.2 174.3 503.2 512.5 
Execution & Support215.4 205.9 641.5 623.4 
Revenue$4,037.1 $3,882.6 $11,743.1 $11,366.9