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Revenue (Tables) | 12 Months Ended
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Dec. 31, 2024
Revenue from Contract with Customer [Abstract] |
Revenue from External Customers by Geographic Areas [Table Text Block] |
| Years ended December 31,
Total revenue: | 2024 |  | 2023 |  | 2022
United States | $ | 6,837.4 |  |  | $ | 7,033.1 |  |  | $ | 7,031.0 |
International: |  |  |  |  |
United Kingdom | 944.3 |  |  | 891.5 |  |  | 902.7 |
Continental Europe | 927.5 |  |  | 901.3 |  |  | 867.5 |
Asia Pacific | 799.3 |  |  | 868.3 |  |  | 918.5 |
Latin America | 473.7 |  |  | 477.0 |  |  | 454.9 |
Other | 709.5 |  |  | 718.1 |  |  | 753.2 |
Total International | 3,854.3 |  |  | 3,856.2 |  |  | 3,896.8 |
Total Consolidated | $ | 10,691.7 |  |  | $ | 10,889.3 |  |  | $ | 10,927.8 |
| Years ended December 31,
Revenue before billable expenses: | 2024 |  | 2023 |  | 2022
United States | $ | 5,940.3 |  |  | $ | 6,102.2 |  |  | $ | 6,157.7 |
International: |  |  |  |  |
United Kingdom | 772.0 |  |  | 759.2 |  |  | 742.2 |
Continental Europe | 805.1 |  |  | 795.7 |  |  | 764.6 |
Asia Pacific | 659.6 |  |  | 729.8 |  |  | 772.7 |
Latin America | 444.6 |  |  | 448.7 |  |  | 423.6 |
Other | 566.0 |  |  | 565.0 |  |  | 588.6 |
Total International | 3,247.3 |  |  | 3,298.4 |  |  | 3,291.7 |
Total Consolidated | $ | 9,187.6 |  |  | $ | 9,400.6 |  |  | $ | 9,449.4 |
MD&E | Years ended December 31,
Total revenue: | 2024 |  | 2023 |  | 2022
United States | $ | 2,662.4 |  |  | $ | 2,737.7 |  |  | $ | 2,735.5 |
International | 1,611.9 |  |  | 1,679.7 |  |  | 1,665.6 |
Total MD&E | $ | 4,274.3 |  |  | $ | 4,417.4 |  |  | $ | 4,401.1 |
Revenue before billable expenses: |  |  |  |  |
United States | $ | 2,644.6 |  |  | $ | 2,709.7 |  |  | $ | 2,696.1 |
International | 1,569.2 |  |  | 1,638.9 |  |  | 1,619.6 |
Total MD&E | $ | 4,213.8 |  |  | $ | 4,348.6 |  |  | $ | 4,315.7 |
IA&C | Years ended December 31,
Total revenue: | 2024 |  | 2023 |  | 2022
United States | $ | 2,392.5 |  |  | $ | 2,502.5 |  |  | $ | 2,580.6 |
International | 1,514.7 |  |  | 1,477.1 |  |  | 1,540.5 |
Total IA&C | $ | 3,907.2 |  |  | $ | 3,979.6 |  |  | $ | 4,121.1 |
Revenue before billable expenses: |  |  |  |  |
United States | $ | 2,283.3 |  |  | $ | 2,377.6 |  |  | $ | 2,478.5 |
International | 1,261.1 |  |  | 1,233.5 |  |  | 1,269.0 |
Total IA&C | $ | 3,544.4 |  |  | $ | 3,611.1 |  |  | $ | 3,747.5 |
SC&E | Years ended December 31,
Total revenue: | 2024 |  | 2023 |  | 2022
United States | $ | 1,782.5 |  |  | $ | 1,792.9 |  |  | $ | 1,714.9 |
International | 727.7 |  |  | 699.4 |  |  | 690.7 |
Total SC&E | $ | 2,510.2 |  |  | $ | 2,492.3 |  |  | $ | 2,405.6 |
Revenue before billable expenses: |  |  |  |  |
United States | $ | 1,012.4 |  |  | $ | 1,014.9 |  |  | $ | 983.1 |
International | 417.0 |  |  | 426.0 |  |  | 403.1 |
Total SC&E | $ | 1,429.4 |  |  | $ | 1,440.9 |  |  | $ | 1,386.2 |
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, 2024 |  | December 31, 2023
Accounts receivable, net of allowance of $37.0 and $46.4, respectively | $ | 5,649.7 |  |  | $ | 5,768.8 |
Accounts receivable, billable to clients | 2,088.4 |  |  | 2,229.2 |
Contract assets | 50.1 |  |  | 68.6 |
Contract liabilities (deferred revenue) | 509.0 |  |  | 684.7 |

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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 -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-10 + 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 -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 41 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-41 + Details
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