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Business Combinations - Additional Information (Details) $ in Millions |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2024 USD ($) | Mar. 31, 2024 USD ($) Acquisition | Dec. 31, 2023 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Number of acquisitions | Acquisition |  | 6 |  |  |
Total consideration for acquisition |  | $ 87 |  |  |
Cash paid | $ 5 | 76 |  |  |
Initial fair value of earnout-out liabilities | 9 | 9 |  |  |
Other payables | 2 | 2 |  |  |
Goodwill acquired in connection with acquisitions and measurement period adjustments |  | 66 |  |  |
Other identifiable intangible assets acquired in connection with acquisitions and measurement period adjustments |  | $ 21 |  |  |
Weighted average useful lives for acquired amortizable intangible assets |  | 15 years |  |  |
Estimated acquisition earn-out payables | 203 | $ 203 | $ 249 | $ 255 | $ 252
Maximum future contingency payments acquisitions | 566 | 566 |  |  |
Other Liabilities |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Estimated acquisition earn-out payables | 85 | 85 |  |  |
Accounts payable |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Estimated acquisition earn-out payables | 118 | $ 118 |  |  |
Business Combinations - Stock Deals |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of acquisitions | Acquisition |  | 2 |  |  |
Assets and Assumed Certain Liabilities |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of acquisitions | Acquisition |  | 3 |  |  |
Book of Business Purchases |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of acquisitions | Acquisition |  | 1 |  |  |
GRP Holdco Limited |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Maximum potential earn- out payable | $ 0 | $ 0 |  |  |
Kentro Capital Limited |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquisition date |  | Oct. 01, 2023 |  |  |

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