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Revenue Major Geographical Area (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Total revenues:        
Total revenue $ 2,542.0 $ 2,125.5 $ 7,308.6 $ 6,511.0
Net revenue 2,261.7 1,954.6 6,559.0 5,780.1
United States        
Total revenues:        
Total revenue 1,612.1 1,354.8 4,595.8 4,234.0
Net revenue 1,459.3 1,273.4 4,204.6 3,820.6
United Kingdom        
Total revenues:        
Total revenue 224.3 172.4 637.4 528.8
Net revenue 195.1 162.0 573.7 474.9
Continental Europe        
Total revenues:        
Total revenue 200.2 174.5 625.6 508.5
Net revenue 178.1 158.0 559.4 453.7
Asia Pacific        
Total revenues:        
Total revenue 229.0 198.1 673.1 609.9
Net revenue 192.0 166.0 553.6 487.4
Latin America        
Total revenues:        
Total revenue 104.3 83.2 290.1 235.7
Net revenue 96.3 78.5 268.6 220.1
Other        
Total revenues:        
Total revenue 172.1 142.5 486.6 394.1
Net revenue 140.9 116.7 399.1 323.4
International        
Total revenues:        
Total revenue 929.9 770.7 2,712.8 2,277.0
Net revenue 802.4 681.2 2,354.4 1,959.5
IAN        
Total revenues:        
Total revenue 2,085.7 1,783.6 6,014.9 5,274.9
Net revenue 1,942.7 1,685.5 5,631.3 4,935.7
IAN | United States        
Total revenues:        
Total revenue 1,306.2 1,130.5 3,731.4 3,402.7
Net revenue 1,242.3 1,093.8 3,581.1 3,254.1
IAN | International        
Total revenues:        
Total revenue 779.5 653.1 2,283.5 1,872.2
Net revenue 700.4 591.7 2,050.2 1,681.6
DXTRA        
Total revenues:        
Total revenue 456.3 341.9 1,293.7 1,236.1
Net revenue 319.0 269.1 927.7 844.4
DXTRA | United States        
Total revenues:        
Total revenue 305.9 224.3 864.4 831.3
Net revenue 217.0 179.6 623.5 566.5
DXTRA | International        
Total revenues:        
Total revenue 150.4 117.6 429.3 404.8
Net revenue $ 102.0 $ 89.5 $ 304.2 $ 277.9