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Revenue (Tables)
 6 Months Ended
Jun. 30, 2021
Disaggregation of Revenue [Line Items]  
Work in Process and Contract Liabilities Work in process and contract liabilities were (in millions):
June 30, 2021December 31, 2020June 30, 2020
Work in process:
   Contract assets and unbilled fees and costs$577.5 $501.1 $660.6 
   Media and production costs540.1 600.1 498.0 
$1,117.6 $1,101.2 $1,158.6 
Contract liabilities:
   Customer advances$1,287.2 $1,361.3 $1,070.0 
Geographic Markets [Member]  
Disaggregation of Revenue [Line Items]  
Disaggregation of Revenue Revenue in our principal geographic markets was (in millions):
Three Months Ended June 30,
Six Months Ended June 30,
2021202020212020
Americas:
North America$1,957.4 $1,664.0 $3,929.9 $3,661.3 
Latin America70.4 54.9 133.7 126.3 
EMEA:
Europe1,044.1 727.5 1,985.1 1,650.8 
Middle East and Africa52.3 34.5 102.5 90.1 
Asia-Pacific447.4 319.8 847.4 679.1 
$3,571.6 $2,800.7 $6,998.6 $6,207.6 
Discipline [Member]  
Disaggregation of Revenue [Line Items]  
Disaggregation of Revenue Revenue by discipline was (in millions):
Three Months Ended June 30,
Six Months Ended June 30,
2021202020212020
Advertising$2,014.5 $1,530.1 $4,018.2 $3,463.4 
CRM Precision Marketing293.6 214.0 563.0 446.0 
CRM Commerce and Brand Consulting221.5 187.7 436.1 408.6 
CRM Experiential124.0 78.5 212.4 209.8 
CRM Execution & Support250.9 192.8 497.5 466.5 
Public Relations345.9 298.1 663.4 631.8 
Healthcare321.2 299.5 608.0 581.5 
 $3,571.6 $2,800.7 $6,998.6 $6,207.6