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Revenue Major Geographical Area (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Total revenues: |  |
Total revenue | $ 2,169.1 | $ 2,063.8
Net revenue | 1,774.0 | 1,675.3
United States |  |
Total revenues: |  |
Total revenue | 1,350.7 | 1,315.2
Net revenue | 1,092.3 | 1,057.1
Total International |  |
Total revenues: |  |
Total revenue | 818.4 | 748.6
Net revenue | 681.7 | 618.2
United Kingdom |  |
Total revenues: |  |
Total revenue | 204.4 | 175.0
Net revenue | 163.5 | 135.2
Continental Europe |  |
Total revenues: |  |
Total revenue | 181.7 | 158.2
Net revenue | 158.7 | 140.9
Asia Pacific |  |
Total revenues: |  |
Total revenue | 231.5 | 220.3
Net revenue | 178.8 | 173.7
Latin America |  |
Total revenues: |  |
Total revenue | 80.0 | 75.8
Net revenue | 73.9 | 69.0
Other |  |
Total revenues: |  |
Total revenue | 120.8 | 119.3
Net revenue | 106.8 | 99.4
IAN |  |
Total revenues: |  |
Total revenue | 1,685.5 | 1,567.8
Net revenue | 1,481.3 | 1,391.1
IAN | United States |  |
Total revenues: |  |
Total revenue | 1,023.2 | 969.9
Net revenue | 898.0 | 862.0
IAN | Total International |  |
Total revenues: |  |
Total revenue | 662.3 | 597.9
Net revenue | 583.3 | 529.1
CMG |  |
Total revenues: |  |
Total revenue | 483.6 | 496.0
Net revenue | 292.7 | 284.2
CMG | United States |  |
Total revenues: |  |
Total revenue | 327.5 | 345.3
Net revenue | 194.3 | 195.1
CMG | Total International |  |
Total revenues: |  |
Total revenue | 156.1 | 150.7
Net revenue | $ 98.4 | $ 89.1

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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