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Concentration of Credit Risk - Schedule Of Gross Written Premium From Major Brokers (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Investment Holdings [Line Items] |  |  |  |  |
Gross written premiums, percentage |  |  | 100.00% | 100.00% | 100.00%
Gross written premiums | $ 2,125.2 | $ 2,351.3 | $ 4,338.7 | $ 3,938.4 | $ 3,698.5
Percentage of written premium major broker accounted minimum |  |  | 10.00% |  |
Aon Corporation |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Gross written premiums, percentage |  |  | 22.30% | 17.30% | 15.80%
Marsh & McLennan Companies, Inc. |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Gross written premiums, percentage |  |  | 21.80% | 17.50% | 15.40%
Willis Group Holdings, Ltd. |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Gross written premiums, percentage |  |  | 8.00% | 9.60% | 10.40%
Others |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Gross written premiums, percentage |  |  | 47.90% | 55.60% | 58.40%

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- Definition Amount of direct and assumed premiums written. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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