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Segment Information - Summarized Financial Information Reportable Segments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |
Total revenues | $ 4,805 | $ 4,257 | $ 3,573
Employee compensation and benefits | 2,406 | 2,187 | 1,817
Other operating expenses | 710 | 650 | 597
(Gain)/loss on disposal | (31) | (143) | (5)
Interest | 193 | 190 | 141
Change in estimated acquisition earn-out payables | 2 | 21 | (39)
Income before income taxes | 1,303 | 1,146 | 876
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 4,745 | 4,222 | 3,568
Income before income taxes | 1,380 | 1,214 | 878
Operating Segments | Retail |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 2,729 | 2,508 | 2,157
Employee compensation and benefits | 1,462 | 1,336 | 1,126
Other operating expenses | 449 | 421 | 377
(Gain)/loss on disposal | (3) | (3) | (8)
Depreciation and amortization | 140 | 131 | 115
Interest | 71 | 85 | 96
Change in estimated acquisition earn-out payables | 8 | 1 | (26)
Income before income taxes | 602 | 537 | 477
Operating Segments | Programs |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 1,400 | 1,173 | 958
Employee compensation and benefits | 450 | 425 | 376
Other operating expenses | 290 | 247 | 223
(Gain)/loss on disposal | (28) | (141) | 1
Depreciation and amortization | 62 | 55 | 53
Interest | 30 | 36 | 33
Change in estimated acquisition earn-out payables | (7) | 0 | (11)
Income before income taxes | 603 | 551 | 283
Operating Segments | Wholesale Brokerage |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 616 | 541 | 453
Employee compensation and benefits | 322 | 284 | 239
Other operating expenses | 92 | 85 | 70
(Gain)/loss on disposal | 0 | 0 | 3
Depreciation and amortization | 15 | 14 | 12
Interest | 11 | 12 | 13
Change in estimated acquisition earn-out payables | 1 | 20 | (2)
Income before income taxes | 175 | 126 | 118
Segment Reconciling Items |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 60 | 35 | 5
Income before income taxes | $ (77) | $ (68) | $ (2)

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