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Revenue Major Geographical Area (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Total revenue | $ 2,856.0 | $ 2,297.5 | $ 2,391.8 | $ 2,169.1 | $ 2,589.8 | $ 2,208.2 | $ 2,185.8 | $ 2,063.8 | $ 9,714.4 | $ 9,047.6 | $ 9,056.2
Net revenue | $ 2,413.7 | $ 1,895.7 | $ 1,948.2 | $ 1,774.0 | $ 2,131.1 | $ 1,832.5 | $ 1,834.6 | $ 1,675.3 | 8,031.6 | 7,473.5 | 7,452.3
United States |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 5,851.0 | 5,417.3 | 5,452.6
Net revenue |  |  |  |  |  |  |  |  | 4,825.0 | 4,458.8 | 4,443.2
Total International |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 3,863.4 | 3,630.3 | 3,603.6
Net revenue |  |  |  |  |  |  |  |  | 3,206.6 | 3,014.7 | 3,009.1
United Kingdom |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 881.4 | 775.7 | 788.8
Net revenue |  |  |  |  |  |  |  |  | 711.7 | 613.1 | 604.3
Continental Europe |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 840.2 | 780.6 | 764.1
Net revenue |  |  |  |  |  |  |  |  | 737.5 | 687.8 | 682.0
Asia Pacific |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 1,170.8 | 1,106.4 | 1,076.0
Net revenue |  |  |  |  |  |  |  |  | 896.8 | 866.9 | 887.7
Latin America |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 389.0 | 386.6 | 417.2
Net revenue |  |  |  |  |  |  |  |  | 350.1 | 350.8 | 367.8
Other |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 582.0 | 581.0 | 557.5
Net revenue |  |  |  |  |  |  |  |  | 510.5 | 496.1 | 467.3
CMG |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 2,158.3 | 2,038.0 | 2,063.4
Net revenue |  |  |  |  |  |  |  |  | 1,264.1 | 1,206.8 | 1,250.9
CMG | United States |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 1,404.0 | 1,355.0 | 1,376.7
Net revenue |  |  |  |  |  |  |  |  | 824.6 | 798.2 | 842.9
CMG | Total International |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 754.3 | 683.0 | 686.7
Net revenue |  |  |  |  |  |  |  |  | 439.5 | 408.6 | 408.0
IAN |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 7,374.4 | 7,009.6 | 6,992.8
Net revenue |  |  |  |  |  |  |  |  | 6,585.8 | 6,266.7 | 6,201.4
IAN | United States |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 4,279.4 | 4,062.3 | 4,075.9
Net revenue |  |  |  |  |  |  |  |  | 3,832.7 | 3,660.6 | 3,600.3
IAN | Total International |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 3,095.0 | 2,947.3 | 2,916.9
Net revenue |  |  |  |  |  |  |  |  | $ 2,753.1 | $ 2,606.1 | $ 2,601.1

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