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Reinsurance - Additional information (Details) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2022 USD ($) item | Dec. 31, 2022 USD ($) item | Dec. 31, 2022 USD ($) item | Dec. 31, 2021 item
Reinsurance Quota Share Program [Member] |  |  |  |
Reinsurance Retention Policy [Line Items] |  |  |  |
Number of placements for reinsurance programs | item |  | 2 | 2 | 2
Reinsurance Quota Share Program [Member] | Coastal Locations [Member] |  |  |  |
Reinsurance Retention Policy [Line Items] |  |  |  |
Reinsured risk percentage |  |  | 61.75% | 90.00%
Reinsurance Quota Share Program [Member] | Core Locations [Member] |  |  |  |
Reinsurance Retention Policy [Line Items] |  |  |  |
Reinsured risk percentage |  |  | 90.00% | 90.00%
Reinsurance Property Catastrophe Treaties [Member] |  |  |  |
Reinsurance Retention Policy [Line Items] |  |  |  |
Number of retention layers for reinsurance policy | item | 4 | 5 | 5 | 3
Excess amount retained |  | $ 336 |  |
Amount retained | $ 2 | $ 4 |  |
Reinsurance Property Non-weather Losses [Member] |  |  |  |
Reinsurance Retention Policy [Line Items] |  |  |  |
Excess amount retained |  |  | $ 500 |
Reinsurance Property Non-weather Losses [Member] | Coastal Locations [Member] |  |  |  |
Reinsurance Retention Policy [Line Items] |  |  |  |
Amount retained |  |  | 191 |
Reinsurance Property Non-weather Losses [Member] | Core Locations [Member] |  |  |  |
Reinsurance Retention Policy [Line Items] |  |  |  |
Amount retained |  |  | $ 50 |

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- Definition Amount per event of risk undertaken originally by insurer that is not ceded to reinsurer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=99397103&loc=d3e6811-158387 + Details
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- Definition Amount per event of risk ceded to reinsurer in excess of risk undertaken originally by insurer that is not ceded to reinsurer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=99397103&loc=d3e6811-158387 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Percentage of risk undertaken originally by insurer ceded to reinsurer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=99397103&loc=d3e6811-158387 + Details
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