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Business Combinations - Estimated Fair Values of Aggregate Assets and Liabilities Acquired (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2025 | Jun. 30, 2024
Fair Value Of Assets And Liabilities Statement [Line Items] |  |
Cash paid | $ 183 |
Other payable | 10 |
Recorded earn-out payable | 17 | $ 19
Total consideration | 210 |
Maximum potential earn-out payable | 48 |
Allocation of purchase price: |  |
Cash and equivalents | 5 |
Fiduciary cash | 17 |
Fiduciary receivables | 22 |
Other current assets | 5 |
Goodwill | 132 |
Other assets | 4 |
Total assets acquired | 246 |
Fiduciary liabilities | (32) |
Other current liabilities | (3) |
Other long-term liabilities | (1) |
Total liabilities assumed | (36) |
Net assets acquired | 210 |
Purchased Customer Accounts and Other |  |
Allocation of purchase price: |  |
Intangible assets | 61 |
NBS Insurance Agency | Wholesale |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |
Cash paid | 54 |
Other payable | 0 |
Recorded earn-out payable | 0 |
Total consideration | 54 |
Maximum potential earn-out payable | 0 |
Allocation of purchase price: |  |
Cash and equivalents | 0 |
Fiduciary cash | 13 |
Fiduciary receivables | 0 |
Other current assets | 4 |
Goodwill | 30 |
Other assets | 0 |
Total assets acquired | 64 |
Fiduciary liabilities | (10) |
Other current liabilities | 0 |
Total liabilities assumed | (10) |
Net assets acquired | 54 |
NBS Insurance Agency | Wholesale | Purchased Customer Accounts and Other |  |
Allocation of purchase price: |  |
Intangible assets | 17 |
Tim Parkman, Inc. | Wholesale |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |
Cash paid | 69 |
Other payable | 6 |
Recorded earn-out payable | 4 |
Total consideration | 79 |
Maximum potential earn-out payable | 23 |
Allocation of purchase price: |  |
Cash and equivalents | 0 |
Fiduciary cash | 0 |
Fiduciary receivables | 0 |
Other current assets | 0 |
Goodwill | 60 |
Other assets | 0 |
Total assets acquired | 79 |
Fiduciary liabilities | 0 |
Other current liabilities | 0 |
Other long-term liabilities | 0 |
Total liabilities assumed | 0 |
Net assets acquired | 79 |
Tim Parkman, Inc. | Wholesale | Purchased Customer Accounts and Other |  |
Allocation of purchase price: |  |
Intangible assets | 19 |
Other Acquisitions | Various |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |
Cash paid | 60 |
Other payable | 4 |
Recorded earn-out payable | 13 |
Total consideration | 77 |
Maximum potential earn-out payable | 25 |
Allocation of purchase price: |  |
Cash and equivalents | 5 |
Fiduciary cash | 4 |
Fiduciary receivables | 22 |
Other current assets | 1 |
Goodwill | 42 |
Other assets | 4 |
Total assets acquired | 103 |
Fiduciary liabilities | (22) |
Other current liabilities | (3) |
Other long-term liabilities | (1) |
Total liabilities assumed | (26) |
Net assets acquired | 77 |
Other Acquisitions | Various | Purchased Customer Accounts and Other |  |
Allocation of purchase price: |  |
Intangible assets | $ 25 |

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