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Revenue Major Geographical Area (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Total revenues:    
Total revenue $ 2,257.0 $ 2,359.8
Net revenue 2,027.7 1,972.1
United States    
Total revenues:    
Total revenue 1,425.8 1,569.6
Net revenue 1,309.8 1,320.0
United Kingdom    
Total revenues:    
Total revenue 203.5 197.1
Net revenue 184.0 165.7
Continental Europe    
Total revenues:    
Total revenue 195.6 169.8
Net revenue 175.8 146.0
Asia Pacific    
Total revenues:    
Total revenue 210.9 211.4
Net revenue 169.1 158.8
Latin America    
Total revenues:    
Total revenue 83.6 86.8
Net revenue 75.4 79.3
Other    
Total revenues:    
Total revenue 137.6 125.1
Net revenue 113.6 102.3
International    
Total revenues:    
Total revenue 831.2 790.2
Net revenue 717.9 652.1
IAN    
Total revenues:    
Total revenue 1,851.4 1,818.8
Net revenue 1,734.1 1,664.5
IAN | United States    
Total revenues:    
Total revenue 1,157.9 1,193.3
Net revenue 1,113.5 1,111.9
IAN | International    
Total revenues:    
Total revenue 693.5 625.5
Net revenue 620.6 552.6
CMG    
Total revenues:    
Total revenue 405.6 541.0
Net revenue 293.6 307.6
CMG | United States    
Total revenues:    
Total revenue 267.9 376.3
Net revenue 196.3 208.1
CMG | International    
Total revenues:    
Total revenue 137.7 164.7
Net revenue $ 97.3 $ 99.5