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Revenue Major Geographical Area (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Total revenues:        
Total revenue $ 2,509.6 $ 2,025.7 $ 4,766.6 $ 4,385.5
Net revenue 2,269.6 1,853.4 4,297.3 3,825.5
United States        
Total revenues:        
Total revenue 1,557.9 1,309.6 2,983.7 2,879.2
Net revenue 1,435.5 1,227.2 2,745.3 2,547.2
United Kingdom        
Total revenues:        
Total revenue 209.6 159.3 413.1 356.4
Net revenue 194.6 147.2 378.6 312.9
Continental Europe        
Total revenues:        
Total revenue 229.8 164.2 425.4 334.0
Net revenue 205.5 149.7 381.3 295.7
Asia Pacific        
Total revenues:        
Total revenue 233.2 200.4 444.1 411.8
Net revenue 192.5 162.6 361.6 321.4
Latin America        
Total revenues:        
Total revenue 104.4 65.7 188.0 152.5
Net revenue 96.9 62.3 172.3 141.6
Other        
Total revenues:        
Total revenue 174.7 126.5 312.3 251.6
Net revenue 144.6 104.4 258.2 206.7
International        
Total revenues:        
Total revenue 951.7 716.1 1,782.9 1,506.3
Net revenue 834.1 626.2 1,552.0 1,278.3
IAN        
Total revenues:        
Total revenue 2,077.8 1,672.5 3,929.2 3,491.3
Net revenue 1,954.5 1,585.7 3,688.6 3,250.2
IAN | United States        
Total revenues:        
Total revenue 1,267.3 1,078.9 2,425.2 2,272.2
Net revenue 1,225.3 1,048.4 2,338.8 2,160.3
IAN | International        
Total revenues:        
Total revenue 810.5 593.6 1,504.0 1,219.1
Net revenue 729.2 537.3 1,349.8 1,089.9
DXTRA        
Total revenues:        
Total revenue 431.8 353.2 837.4 894.2
Net revenue 315.1 267.7 608.7 575.3
DXTRA | United States        
Total revenues:        
Total revenue 290.6 230.7 558.5 607.0
Net revenue 210.2 178.8 406.5 386.9
DXTRA | International        
Total revenues:        
Total revenue 141.2 122.5 278.9 287.2
Net revenue $ 104.9 $ 88.9 $ 202.2 $ 188.4