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Revenue - Major Geographical Area (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Total revenues:        
Total revenue $ 2,494.0 $ 2,628.8 $ 7,353.4 $ 7,834.7
Revenue before billable expenses 2,135.6 2,242.7 6,304.6 6,752.7
MD&E        
Total revenues:        
Total revenue 954.1 1,041.5 2,812.1 3,083.2
Revenue before billable expenses 938.8 1,025.2 2,773.9 3,043.8
IA&C        
Total revenues:        
Total revenue 940.1 942.9 2,753.0 2,913.1
Revenue before billable expenses 848.1 849.4 2,490.6 2,647.1
SC&E        
Total revenues:        
Total revenue 599.8 644.4 1,788.3 1,838.4
Revenue before billable expenses 348.7 368.1 1,040.1 1,061.8
United States        
Total revenues:        
Total revenue 1,607.7 1,699.5 4,826.7 5,117.3
Revenue before billable expenses 1,399.3 1,467.8 4,183.8 4,469.6
United States | MD&E        
Total revenues:        
Total revenue 619.0 662.2 1,838.4 1,978.9
Revenue before billable expenses 613.7 656.3 1,826.9 1,966.1
United States | IA&C        
Total revenues:        
Total revenue 574.9 574.0 1,696.8 1,827.1
Revenue before billable expenses 540.8 546.6 1,610.8 1,748.1
United States | SC&E        
Total revenues:        
Total revenue 413.8 463.3 1,291.5 1,311.3
Revenue before billable expenses 244.8 264.9 746.1 755.4
United Kingdom        
Total revenues:        
Total revenue 223.2 236.3 618.7 684.7
Revenue before billable expenses 181.4 193.8 518.8 565.5
Continental Europe        
Total revenues:        
Total revenue 226.0 211.7 663.5 645.1
Revenue before billable expenses 180.0 177.5 551.8 556.2
Asia Pacific        
Total revenues:        
Total revenue 169.0 190.8 489.1 566.5
Revenue before billable expenses 144.8 156.9 404.3 467.0
Latin America        
Total revenues:        
Total revenue 96.7 117.9 269.3 320.7
Revenue before billable expenses 88.0 111.9 247.3 301.2
Other        
Total revenues:        
Total revenue 171.4 172.6 486.1 500.4
Revenue before billable expenses 142.1 134.8 398.6 393.2
Total International        
Total revenues:        
Total revenue 886.3 929.3 2,526.7 2,717.4
Revenue before billable expenses 736.3 774.9 2,120.8 2,283.1
Total International | MD&E        
Total revenues:        
Total revenue 335.1 379.3 973.7 1,104.3
Revenue before billable expenses 325.1 368.9 947.0 1,077.7
Total International | IA&C        
Total revenues:        
Total revenue 365.2 368.9 1,056.2 1,086.0
Revenue before billable expenses 307.3 302.8 879.8 899.0
Total International | SC&E        
Total revenues:        
Total revenue 186.0 181.1 496.8 527.1
Revenue before billable expenses $ 103.9 $ 103.2 $ 294.0 $ 306.4