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Revenue (Tables)
 9 Months Ended
Sep. 30, 2021
Disaggregation of Revenue [Line Items]  
Work in Process and Contract Liabilities Work in process and contract liabilities were (in millions):
September 30, 2021December 31, 2020September 30, 2020
Work in process:
   Contract assets and unbilled fees and costs$596.6 $501.1 $648.0 
   Media and production costs653.0 600.1 526.4 
$1,249.6 $1,101.2 $1,174.4 
Contract liabilities:
   Customer advances$1,325.8 $1,361.3 $1,129.5 
Geographic Markets [Member]  
Disaggregation of Revenue [Line Items]  
Disaggregation of Revenue Revenue in our principal geographic markets was (in millions):
Three Months Ended September 30,
Nine Months Ended September 30,
2021202020212020
Americas:
North America$1,821.8 $1,854.7 $5,751.7 $5,516.0 
Latin America72.5 61.6 206.1 187.8 
EMEA:
Europe1,024.3 875.0 3,009.5 2,525.9 
Middle East and Africa58.1 45.2 160.6 135.3 
Asia-Pacific458.3 370.0 1,305.7 1,049.1 
$3,435.0 $3,206.5 $10,433.6 $9,414.1 
Discipline [Member]  
Disaggregation of Revenue [Line Items]  
Disaggregation of Revenue Revenue by discipline was (in millions):
Three Months Ended September 30,
Nine Months Ended September 30,
2021202020212020
Advertising$1,820.6 $1,827.6 $5,838.8 $5,291.0 
CRM Precision Marketing309.4 237.1 872.4 683.1 
CRM Commerce and Brand Consulting231.3 194.2 667.4 602.8 
CRM Experiential132.7 88.1 345.1 297.9 
CRM Execution & Support258.8 235.5 756.3 702.0 
Public Relations359.4 325.6 1,022.8 957.4 
Healthcare322.8 298.4 930.8 879.9 
 $3,435.0 $3,206.5 $10,433.6 $9,414.1