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Business Combinations - Additional Information (Details) $ in Millions |  | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) Acquisition | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of acquisitions | Acquisition |  | 18 |  |  |  |  |
Measurement period adjustment, fiduciary assets |  | $ 20 |  |  |  |  |
Measurement period adjustment, fiduciary liabilities |  | 20 |  |  |  |  |
Measurement period adjustment, goodwill |  | 13 |  |  |  |  |
Cash paid | $ 4 |  |  |  |  |  |
Measurement period adjustment, deferred consideration |  | 5 |  |  |  |  |
Measurement period adjustment, non-controlling interest |  | 6 |  |  |  |  |
Net assets acquired | 147 | 147 |  |  |  |  |
Aggregate purchase price of acquisitions |  | (2) |  |  |  |  |
Total consideration | 147 | 147 |  |  |  |  |
Goodwill | 108 | 108 |  |  |  |  |
Estimated acquisition earn-out payables | 169 | 169 | $ 203 | $ 249 | $ 232 | $ 254 | $ 252
Maximum future contingency payments acquisitions | 485 | 485 |  |  |  |  |
Other Noncurrent Liabilities |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Estimated acquisition earn-out payables | 76 | 76 |  |  |  |  |
Accounts payable |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Estimated acquisition earn-out payables | 93 | 93 |  |  |  |  |
Retail |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Measurement period adjustment, goodwill |  | 6 |  |  |  |  |
Wholesale Brokerage |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Measurement period adjustment, goodwill |  | $ 6 |  |  |  |  |
Purchased Customer Accounts |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Weighted average life (years) |  | 15 years |  |  |  |  |
Business Combinations - Stock Deals |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of acquisitions | Acquisition |  | 5 |  |  |  |  |
Assets and Assumed Certain Liabilities |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of acquisitions | Acquisition |  | 8 |  |  |  |  |
Book of Business Purchases |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of acquisitions | Acquisition |  | 5 |  |  |  |  |
Other Acquisitions | Maximum |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Total consideration | $ 50 | $ 50 |  |  |  |  |

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