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Revenue (Tables)
 12 Months Ended
Dec. 31, 2021
Disaggregation of Revenue [Line Items]  
Work in Process and Contract Liabilities Work in process and contract liabilities were (in millions):
December 31,
20212020
Work in process:
   Contract assets and unbilled fees and costs$469.9 $501.1 
   Media and production costs731.1 600.1 
$1,201.0 $1,101.2 
Contract liabilities:
   Customer advances$1,644.5 $1,361.3 
Geographic Markets [Member]  
Disaggregation of Revenue [Line Items]  
Disaggregation of Revenue Revenue in our geographic markets was (in millions):
Year Ended December 31,
202120202019
Americas:
North America$7,709.7 $7,577.1 $8,478.8 
Latin America296.1 275.4 403.4 
EMEA:
Europe4,219.6 3,607.7 4,107.4 
Middle East and Africa267.6 207.2 314.6 
Asia-Pacific1,796.4 1,503.7 1,649.5 
$14,289.4 $13,171.1 $14,953.7 
Discipline [Member]  
Disaggregation of Revenue [Line Items]  
Disaggregation of Revenue Revenue by discipline was (in millions):
Year Ended December 31,
202120202019
Advertising$7,959.3 $7,511.4 $8,664.2 
Precision Marketing1,194.8 944.6 927.2 
Commerce & Brand Consulting910.7 821.8 971.8 
Experiential545.9 426.8 670.0 
Execution & Support1,026.6 961.3 1,177.2 
Public Relations1,391.7 1,310.9 1,386.7 
Healthcare1,260.4 1,194.3 1,156.6 
 $14,289.4 $13,171.1 $14,953.7