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Revenue (Tables)
 3 Months Ended
Mar. 31, 2025
Disaggregation of Revenue [Line Items]  
Contract Balances
March 31, 2025December 31, 2024March 31, 2024
Work in process:
Media and production costs$899.2 $864.0 $788.8 
Unbilled fees and costs and contract assets1,031.0 758.2 922.8 
Work in process$1,930.2 $1,622.2 $1,711.6 
Customer advances$1,283.5 $1,336.1 $1,238.2 
Geographic Markets [Member]  
Disaggregation of Revenue [Line Items]  
Disaggregation of Revenue
Revenue by geographic market:
Three Months Ended March 31,
20252024
Americas:
North America$2,111.5 $2,040.9 
Latin America96.4 96.5 
EMEA:
Europe995.0 1,005.8 
Middle East and Africa70.8 79.6 
Asia-Pacific416.7 407.7 
Revenue$3,690.4 $3,630.5 
Discipline [Member]  
Disaggregation of Revenue [Line Items]  
Disaggregation of Revenue
Revenue by discipline:
Three Months Ended March 31,
20252024
Media & Advertising$2,048.2 $1,954.2 
Precision Marketing450.3 425.4 
Public Relations362.7 383.5 
Healthcare305.7 317.0 
Branding & Retail Commerce159.5 185.5 
Experiential154.2 155.7 
Execution & Support209.8 209.2 
Revenue$3,690.4 $3,630.5