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Revenue (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Disaggregation of Revenue [Line Items]      
Revenue $ 3,468.9 $ 3,629.6  
Contract assets and unbilled fees and costs 755.5 782.9 $ 540.1
Media and production costs 558.9 595.1 621.4
Work in process: 1,314.4 1,378.0 1,161.5
Customer advances 1,104.1 1,214.3 $ 1,159.0
North America      
Disaggregation of Revenue [Line Items]      
Revenue 1,989.2 1,985.7  
Latin America      
Disaggregation of Revenue [Line Items]      
Revenue 89.0 108.4  
Europe      
Disaggregation of Revenue [Line Items]      
Revenue 945.5 1,070.1  
Middle East and Africa      
Disaggregation of Revenue [Line Items]      
Revenue 79.0 73.4  
Asia-Pacific      
Disaggregation of Revenue [Line Items]      
Revenue 366.2 392.0  
Advertising      
Disaggregation of Revenue [Line Items]      
Revenue 1,921.3 1,901.3  
CRM Consumer Experience      
Disaggregation of Revenue [Line Items]      
Revenue 605.8 634.9  
CRM Execution & Support      
Disaggregation of Revenue [Line Items]      
Revenue 349.5 508.6  
Public Relations      
Disaggregation of Revenue [Line Items]      
Revenue 334.2 346.3  
Healthcare      
Disaggregation of Revenue [Line Items]      
Revenue $ 258.1 $ 238.5