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Revenue (Tables)
 9 Months Ended
Sep. 30, 2025
Revenue from Contract with Customer [Abstract]  
Schedule of Disaggregation of Revenue Principal Geographic Markets Our geographic revenue breakdown is listed below.
 Three months ended
September 30,		Nine months ended
September 30,
Total revenue:2025202420252024
United States$1,607.7 $1,699.5 $4,826.7 $5,117.3 
International:
United Kingdom223.2 236.3 618.7 684.7 
Continental Europe226.0 211.7 663.5 645.1 
Asia Pacific169.0 190.8 489.1 566.5 
Latin America96.7 117.9 269.3 320.7 
Other171.4 172.6 486.1 500.4 
Total International886.3 929.3 2,526.7 2,717.4 
Total Consolidated$2,494.0 $2,628.8 $7,353.4 $7,834.7 
 
 Three months ended
September 30,		Nine months ended
September 30,
Revenue before billable expenses:2025202420252024
United States$1,399.3 $1,467.8 $4,183.8 $4,469.6 
International:
United Kingdom181.4 193.8 518.8 565.5 
Continental Europe180.0 177.5 551.8 556.2 
Asia Pacific144.8 156.9 404.3 467.0 
Latin America88.0 111.9 247.3 301.2 
Other142.1 134.8 398.6 393.2 
Total International736.3 774.9 2,120.8 2,283.1 
Total Consolidated$2,135.6 $2,242.7 $6,304.6 $6,752.7 
MD&EThree months ended
September 30,		Nine months ended
September 30,
Total revenue:2025202420252024
United States$619.0 $662.2 $1,838.4 $1,978.9 
International335.1 379.3 973.7 1,104.3 
Total MD&E$954.1 $1,041.5 $2,812.1 $3,083.2 
Revenue before billable expenses:
United States$613.7 $656.3 $1,826.9 $1,966.1 
International325.1 368.9 947.0 1,077.7 
Total MD&E$938.8 $1,025.2 $2,773.9 $3,043.8 
 
IA&CThree months ended
September 30,		Nine months ended
September 30,
Total revenue:2025202420252024
United States$574.9 $574.0 $1,696.8 $1,827.1 
International365.2 368.9 1,056.2 1,086.0 
Total IA&C$940.1 $942.9 $2,753.0 $2,913.1 
Revenue before billable expenses:
United States$540.8 $546.6 $1,610.8 $1,748.1 
International307.3 302.8 879.8 899.0 
Total IA&C$848.1 $849.4 $2,490.6 $2,647.1 

SC&EThree months ended
September 30,		Nine months ended
September 30,
Total revenue:2025202420252024
United States$413.8 $463.3 $1,291.5 $1,311.3 
International186.0 181.1 496.8 527.1 
Total SC&E$599.8 $644.4 $1,788.3 $1,838.4 
Revenue before billable expenses:
United States$244.8 $264.9 $746.1 $755.4 
International103.9 103.2 294.0 306.4 
Total SC&E$348.7 $368.1 $1,040.1 $1,061.8 
Schedule of Contract Balances
The following table provides information about receivables, contract assets and contract liabilities from contracts with customers.
September 30,
2025		December 31,
2024
Accounts receivable, net of allowance of $39.7 and $37.0, respectively
$4,946.4 $5,649.7 
Accounts receivable, billable to clients2,073.6 2,088.4 
Contract assets49.9 50.1 
Contract liabilities (deferred revenue)595.7 509.0