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Segment Information - Summarized Financial Information Reportable Segments (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Segment Reporting Information [Line Items] |  |  |
Total revenues | $ 1,258 | $ 1,116 |
Investment income | 18 | 7 |
Amortization | 43 | 41 |
Depreciation | 11 | 10 |
Interest expense | 48 | 47 |
Income before income taxes | 364 | 294 |
Total assets | 14,806 | 13,400 | $ 14,883
Capital expenditures | 13 | 12 |
Operating Segments | Retail |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 806 | 733 |
Investment income | 1 | 0 |
Amortization | 29 | 28 |
Depreciation | 5 | 5 |
Interest expense | 19 | 22 |
Income before income taxes | 238 | 214 |
Total assets | 8,557 | 7,913 |
Capital expenditures | 7 | 5 |
Operating Segments | Programs |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 298 | 255 |
Investment income | 5 | 1 |
Amortization | 11 | 11 |
Depreciation | 4 | 3 |
Interest expense | 8 | 10 |
Income before income taxes | 101 | 75 |
Total assets | 4,221 | 3,652 |
Capital expenditures | 5 | 5 |
Operating Segments | Wholesale Brokerage |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 142 | 123 |
Investment income | 1 | 0 |
Amortization | 3 | 3 |
Depreciation | 1 | 1 |
Interest expense | 3 | 3 |
Income before income taxes | 41 | 31 |
Total assets | 1,617 | 1,441 |
Capital expenditures | 1 | 0 |
Segment Reconciling Items |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 12 | 5 |
Investment income | 11 | 6 |
Amortization | 0 | (1) |
Depreciation | 1 | 1 |
Interest expense | 18 | 12 |
Income before income taxes | (16) | (26) |
Total assets | 411 | 394 |
Capital expenditures | $ 0 | $ 2 |

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