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Business Combinations - Additional Information (Details) $ in Millions |  |  | 1 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 28, 2024 USD ($) Acquisition | Sep. 30, 2024 USD ($) | Oct. 28, 2024 USD ($) | Sep. 30, 2024 USD ($) Acquisition | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of acquisitions | Acquisition |  |  |  | 22 |  |  |  |  |
Measurement period adjustment, fiduciary assets |  |  |  | $ 20 |  |  |  |  |
Measurement period adjustment, fiduciary liabilities |  |  |  | 20 |  |  |  |  |
Measurement period adjustment, goodwill |  |  |  | 7 |  |  |  |  |
Cash paid |  | $ 4 |  |  |  |  |  |  |
Measurement period adjustment, non-controlling interest |  |  |  | 6 |  |  |  |  |
Measurement period adjustment, amortizable intangible assets |  |  |  | 11 |  |  |  |  |
Measurement period adjustment, other net asstes |  |  |  | (3) |  |  |  |  |
Measurement period adjustment, goodwill |  |  |  | 7 |  |  |  |  |
Measurement period adjustment, total considration |  |  |  | 9 |  |  |  |  |
Net assets acquired |  | 187 |  | 187 |  |  |  |  |
Total consideration |  | 187 |  | 187 |  |  |  |  |
Goodwill |  | 127 |  | 127 |  |  |  |  |
Estimated acquisition earn-out payables |  | 137 |  | 137 | $ 169 | $ 249 | $ 258 | $ 231 | $ 252
Maximum future contingency payments acquisitions |  | 460 |  | 460 |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of acquisitions | Acquisition | 1 |  |  |  |  |  |  |  |
Maximum purchase price for acquisition |  |  | $ 74 |  |  |  |  |  |
Other Noncurrent Liabilities |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Estimated acquisition earn-out payables |  | 64 |  | 64 |  |  |  |  |
Accounts payable |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Estimated acquisition earn-out payables |  | 73 |  | 73 |  |  |  |  |
Retail |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Measurement period adjustment, goodwill |  |  |  | (37) |  |  |  |  |
Wholesale Brokerage |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Measurement period adjustment, goodwill |  |  |  | $ 6 |  |  |  |  |
Purchased Customer Accounts |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Weighted average life (years) |  |  |  | 15 years |  |  |  |  |
Maximum | Subsequent Event |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Total consideration | $ 50 |  | $ 50 |  |  |  |  |  |
Business Combinations - Stock Deals |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of acquisitions | Acquisition |  |  |  | 7 |  |  |  |  |
Assets and Assumed Certain Liabilities |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of acquisitions | Acquisition |  |  |  | 11 |  |  |  |  |
Book of Business Purchases |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of acquisitions | Acquisition |  |  |  | 4 |  |  |  |  |
Other Acquisitions | Maximum |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Total consideration |  | $ 50 |  | $ 50 |  |  |  |  |

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