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Revenue (Tables) | 12 Months Ended
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Dec. 31, 2020
Revenue from Contract with Customer [Abstract] |
Revenue from External Customers by Geographic Areas [Table Text Block] |
| Years ended December 31,
Total revenue: | 2020 |  | 2019 |  | 2018
United States | $ | 5,751.5 |  |  | $ | 6,368.7 |  |  | $ | 5,851.0 |
International: |  |  |  |  |
United Kingdom | 742.9 |  |  | 871.8 |  |  | 881.4 |
Continental Europe | 763.5 |  |  | 842.9 |  |  | 840.2 |
Asia Pacific | 879.5 |  |  | 1,102.3 |  |  | 1,170.8 |
Latin America | 349.7 |  |  | 431.6 |  |  | 389.0 |
Other | 573.9 |  |  | 604.0 |  |  | 582.0 |
Total International | 3,309.5 |  |  | 3,852.6 |  |  | 3,863.4 |
Total Consolidated | $ | 9,061.0 |  |  | $ | 10,221.3 |  |  | $ | 9,714.4 |
| Years ended December 31,
Net revenue: | 2020 |  | 2019 |  | 2018
United States | $ | 5,211.4 |  |  | $ | 5,386.1 |  |  | $ | 4,825.0 |
International: |  |  |  |  |
United Kingdom | 664.3 |  |  | 727.0 |  |  | 711.7 |
Continental Europe | 683.6 |  |  | 742.4 |  |  | 737.5 |
Asia Pacific | 710.5 |  |  | 858.3 |  |  | 896.8 |
Latin America | 323.4 |  |  | 389.9 |  |  | 350.1 |
Other | 471.3 |  |  | 521.4 |  |  | 510.5 |
Total International | 2,853.1 |  |  | 3,239.0 |  |  | 3,206.6 |
Total Consolidated | $ | 8,064.5 |  |  | $ | 8,625.1 |  |  | $ | 8,031.6 |
IAN | Years ended December 31,
Total revenue: | 2020 |  | 2019 |  | 2018
United States | $ | 4,658.5 |  |  | $ | 4,878.1 |  |  | $ | 4,318.2 |
International | 2,751.6 |  |  | 3,113.9 |  |  | 3,109.1 |
Total IAN | $ | 7,410.1 |  |  | $ | 7,992.0 |  |  | $ | 7,427.3 |
Net revenue: |  |  |  |  |
United States | $ | 4,451.7 |  |  | $ | 4,538.1 |  |  | $ | 3,953.8 |
International | 2,469.7 |  |  | 2,790.7 |  |  | 2,767.1 |
Total IAN | $ | 6,921.4 |  |  | $ | 7,328.8 |  |  | $ | 6,720.9 |
DXTRA | Years ended December 31,
Total revenue: | 2020 |  | 2019 |  | 2018
United States | $ | 1,093.0 |  |  | $ | 1,490.6 |  |  | $ | 1,532.8 |
International | 557.9 |  |  | 738.7 |  |  | 754.3 |
Total DXTRA | $ | 1,650.9 |  |  | $ | 2,229.3 |  |  | $ | 2,287.1 |
Net revenue: |  |  |  |  |
United States | $ | 759.7 |  |  | $ | 848.0 |  |  | $ | 871.2 |
International | 383.4 |  |  | 448.3 |  |  | 439.5 |
Total DXTRA | $ | 1,143.1 |  |  | $ | 1,296.3 |  |  | $ | 1,310.7 |
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, 2020 |  | December 31, 2019
Accounts receivable, net of allowance of $98.3 and $40.2, respectively | $ | 4,646.4 |  |  | $ | 5,209.2 |
Accounts receivable, billable to clients | 1,820.7 |  |  | 1,934.1 |
Contract assets | 51.8 |  |  | 63.0 |
Contract liabilities (deferred revenue) | 657.8 |  |  | 585.6 |

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 + Details
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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=120311839&loc=d3e9038-108599 + Details
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