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Revenue (Tables) | 12 Months Ended
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Dec. 31, 2019
Revenue from Contract with Customer [Abstract] |
Revenue from External Customers by Geographic Areas [Table Text Block] |
| Years ended December 31,
Total revenue: | 2019 |  | 2018 |  | 2017
United States | $ | 6,368.7 |  |  | $ | 5,851.0 |  |  | $ | 5,417.3 |
International: |  |  |  |  |
United Kingdom | 871.8 |  |  | 881.4 |  |  | 775.7 |
Continental Europe | 842.9 |  |  | 840.2 |  |  | 780.6 |
Asia Pacific | 1,102.3 |  |  | 1,170.8 |  |  | 1,106.4 |
Latin America | 431.6 |  |  | 389.0 |  |  | 386.6 |
Other | 604.0 |  |  | 582.0 |  |  | 581.0 |
Total International | 3,852.6 |  |  | 3,863.4 |  |  | 3,630.3 |
Total Consolidated | $ | 10,221.3 |  |  | $ | 9,714.4 |  |  | $ | 9,047.6 |
| Years ended December 31,
Net revenue: | 2019 |  | 2018 |  | 2017
United States | $ | 5,386.1 |  |  | $ | 4,825.0 |  |  | $ | 4,458.8 |
International: |  |  |  |  |
United Kingdom | 727.0 |  |  | 711.7 |  |  | 613.1 |
Continental Europe | 742.4 |  |  | 737.5 |  |  | 687.8 |
Asia Pacific | 858.3 |  |  | 896.8 |  |  | 866.9 |
Latin America | 389.9 |  |  | 350.1 |  |  | 350.8 |
Other | 521.4 |  |  | 510.5 |  |  | 496.1 |
Total International | 3,239.0 |  |  | 3,206.6 |  |  | 3,014.7 |
Total Consolidated | $ | 8,625.1 |  |  | $ | 8,031.6 |  |  | $ | 7,473.5 |
IAN | Years ended December 31,
Total revenue: | 2019 |  | 2018 |  | 2017
United States | $ | 4,912.5 |  |  | $ | 4,447.0 |  |  | $ | 4,062.3 |
International | 3,113.9 |  |  | 3,109.1 |  |  | 2,947.3 |
Total IAN | $ | 8,026.4 |  |  | $ | 7,556.1 |  |  | $ | 7,009.6 |
Net revenue: |  |  |  |  |
United States | $ | 4,557.5 |  |  | $ | 4,000.4 |  |  | $ | 3,660.6 |
International | 2,790.7 |  |  | 2,767.1 |  |  | 2,606.1 |
Total IAN | $ | 7,348.2 |  |  | $ | 6,767.5 |  |  | $ | 6,266.7 |
CMG | Years ended December 31,
Total revenue: | 2019 |  | 2018 |  | 2017
United States | $ | 1,456.2 |  |  | $ | 1,404.0 |  |  | $ | 1,355.0 |
International | 738.7 |  |  | 754.3 |  |  | 683.0 |
Total CMG | $ | 2,194.9 |  |  | $ | 2,158.3 |  |  | $ | 2,038.0 |
Net revenue: |  |  |  |  |
United States | $ | 828.6 |  |  | $ | 824.6 |  |  | $ | 798.2 |
International | 448.3 |  |  | 439.5 |  |  | 408.6 |
Total CMG | $ | 1,276.9 |  |  | $ | 1,264.1 |  |  | $ | 1,206.8 |
Contract with Customer, Asset and Liability [Table Text Block] | Contract Balances The following table provides information about receivables, contract assets and contract liabilities from contracts with customers.
| December 31, 2019 |  | December 31, 2018
Accounts receivable, net of allowance of $40.2 and $42.5, respectively | $ | 5,209.2 |  |  | $ | 5,126.6 |
Accounts receivable, billable to clients | 1,934.1 |  |  | 1,900.6 |
Contract assets | 63.0 |  |  | 67.9 |
Contract liabilities (deferred revenue) | 585.6 |  |  | 533.9 |

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- Definition Tabular disclosure of revenue from external customers by geographic areas attributed to the entity's country of domicile and to foreign countries from which the entity derives revenue. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph a -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e9038-108599 + Details
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