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Revenue (Tables) | 12 Months Ended
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Dec. 31, 2022
Revenue from Contract with Customer [Abstract] |
Revenue from External Customers by Geographic Areas [Table Text Block] |
| Years ended December 31,
Total revenue: | 2022 |  | 2021 |  | 2020
United States | $ | 7,031.0 |  |  | $ | 6,360.2 |  |  | $ | 5,751.5 |
International: |  |  |  |  |
United Kingdom | 902.7 |  |  | 880.5 |  |  | 742.9 |
Continental Europe | 867.5 |  |  | 892.8 |  |  | 763.5 |
Asia Pacific | 918.5 |  |  | 970.1 |  |  | 879.5 |
Latin America | 454.9 |  |  | 430.3 |  |  | 349.7 |
Other | 753.2 |  |  | 706.8 |  |  | 573.9 |
Total International | 3,896.8 |  |  | 3,880.5 |  |  | 3,309.5 |
Total Consolidated | $ | 10,927.8 |  |  | $ | 10,240.7 |  |  | $ | 9,061.0 |
| Years ended December 31,
Revenue before billable expenses: | 2022 |  | 2021 |  | 2020
United States | $ | 6,157.7 |  |  | $ | 5,763.1 |  |  | $ | 5,211.4 |
International: |  |  |  |  |
United Kingdom | 742.2 |  |  | 781.5 |  |  | 664.3 |
Continental Europe | 764.6 |  |  | 799.7 |  |  | 683.6 |
Asia Pacific | 772.7 |  |  | 791.4 |  |  | 710.5 |
Latin America | 423.6 |  |  | 396.4 |  |  | 323.4 |
Other | 588.6 |  |  | 575.8 |  |  | 471.3 |
Total International | 3,291.7 |  |  | 3,344.8 |  |  | 2,853.1 |
Total Consolidated | $ | 9,449.4 |  |  | $ | 9,107.9 |  |  | $ | 8,064.5 |
MD&E | Years ended December 31,
Total revenue: | 2022 |  | 2021 |  | 2020
United States | $ | 2,547.8 |  |  | $ | 2,432.6 |  |  | $ | 2,196.6 |
International | 1,648.9 |  |  | 1,629.1 |  |  | 1,323.8 |
Total MD&E | $ | 4,196.7 |  |  | $ | 4,061.7 |  |  | $ | 3,520.4 |
Revenue before billable expenses: |  |  |  |  |
United States | $ | 2,512.1 |  |  | $ | 2,403.6 |  |  | $ | 2,168.9 |
International | 1,599.4 |  |  | 1,570.0 |  |  | 1,282.3 |
Total MD&E | $ | 4,111.5 |  |  | $ | 3,973.6 |  |  | $ | 3,451.2 |
IA&C | Years ended December 31,
Total revenue: | 2022 |  | 2021 |  | 2020
United States | $ | 2,768.3 |  |  | $ | 2,555.4 |  |  | $ | 2,323.0 |
International | 1,557.2 |  |  | 1,621.3 |  |  | 1,401.6 |
Total IA&C | $ | 4,325.5 |  |  | $ | 4,176.7 |  |  | $ | 3,724.6 |
Revenue before billable expenses: |  |  |  |  |
United States | $ | 2,662.5 |  |  | $ | 2,454.4 |  |  | $ | 2,230.3 |
International | 1,289.2 |  |  | 1,369.4 |  |  | 1,197.2 |
Total IA&C | $ | 3,951.7 |  |  | $ | 3,823.8 |  |  | $ | 3,427.5 |
SC&E | Years ended December 31,
Total revenue: | 2022 |  | 2021 |  | 2020
United States | $ | 1,714.9 |  |  | $ | 1,372.2 |  |  | $ | 1,231.9 |
International | 690.7 |  |  | 630.1 |  |  | 584.1 |
Total SC&E | $ | 2,405.6 |  |  | $ | 2,002.3 |  |  | $ | 1,816.0 |
Revenue before billable expenses: |  |  |  |  |
United States | $ | 983.1 |  |  | $ | 905.1 |  |  | $ | 812.2 |
International | 403.1 |  |  | 405.4 |  |  | 373.6 |
Total SC&E | $ | 1,386.2 |  |  | $ | 1,310.5 |  |  | $ | 1,185.8 |
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, 2022 |  | December 31, 2021
Accounts receivable, net of allowance of $48.6 and $68.5, respectively | $ | 5,316.0 |  |  | $ | 5,177.7 |
Accounts receivable, billable to clients | 2,023.0 |  |  | 2,347.2 |
Contract assets | 67.4 |  |  | 62.3 |
Contract liabilities (deferred revenue) | 680.0 |  |  | 688.5 |

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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 https://asc.fasb.org/extlink&oid=126920106&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 https://asc.fasb.org/extlink&oid=126901519&loc=d3e9038-108599 + Details
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