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Revenue Major Geographical Area (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Total revenues: |  |  |  |
Net revenue | $ 1,895.7 | $ 1,832.5 | $ 5,617.9 | $ 5,342.4
Total revenue | 2,297.5 | 2,208.2 | 6,858.4 | 6,457.8
United States |  |  |  |
Total revenues: |  |  |  |
Net revenue | 1,160.9 | 1,109.6 | 3,424.7 | 3,294.3
Total revenue | 1,407.1 | 1,340.8 | 4,203.5 | 4,006.8
Total International |  |  |  |
Total revenues: |  |  |  |
Net revenue | 734.8 | 722.9 | 2,193.2 | 2,048.1
Total revenue | 890.4 | 867.4 | 2,654.9 | 2,451.0
United Kingdom |  |  |  |
Total revenues: |  |  |  |
Net revenue | 174.0 | 160.0 | 513.2 | 436.9
Total revenue | 220.9 | 201.7 | 626.9 | 542.7
Continental Europe |  |  |  |
Total revenues: |  |  |  |
Net revenue | 152.0 | 150.7 | 489.4 | 446.2
Total revenue | 177.5 | 171.6 | 564.3 | 506.1
Asia Pacific |  |  |  |
Total revenues: |  |  |  |
Net revenue | 210.6 | 203.7 | 603.6 | 582.7
Total revenue | 267.3 | 259.9 | 803.0 | 740.7
Latin America |  |  |  |
Total revenues: |  |  |  |
Net revenue | 84.0 | 86.9 | 239.9 | 241.6
Total revenue | 95.3 | 94.9 | 267.8 | 265.2
Other |  |  |  |
Total revenues: |  |  |  |
Net revenue | 114.2 | 121.6 | 347.1 | 340.7
Total revenue | 129.4 | 139.3 | 392.9 | 396.3
IAN |  |  |  |
Total revenues: |  |  |  |
Net revenue | 1,580.5 | 1,531.4 | 4,690.9 | 4,456.5
Total revenue | 1,774.7 | 1,702.8 | 5,272.7 | 4,981.9
IAN | United States |  |  |  |
Total revenues: |  |  |  |
Net revenue | 952.9 | 913.1 | 2,814.2 | 2,701.4
Total revenue | 1,064.2 | 1,006.2 | 3,150.6 | 2,998.4
IAN | Total International |  |  |  |
Total revenues: |  |  |  |
Net revenue | 627.6 | 618.3 | 1,876.7 | 1,755.1
Total revenue | 710.5 | 696.6 | 2,122.1 | 1,983.5
CMG |  |  |  |
Total revenues: |  |  |  |
Net revenue | 315.2 | 301.1 | 927.0 | 885.9
Total revenue | 522.8 | 505.4 | 1,585.7 | 1,475.9
CMG | United States |  |  |  |
Total revenues: |  |  |  |
Net revenue | 208.0 | 196.5 | 610.5 | 592.9
Total revenue | 342.9 | 334.6 | 1,052.9 | 1,008.4
CMG | Total International |  |  |  |
Total revenues: |  |  |  |
Net revenue | 107.2 | 104.6 | 316.5 | 293.0
Total revenue | $ 179.9 | $ 170.8 | $ 532.8 | $ 467.5

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