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Reinsurance - Additional Information (Details) - USD ($) $ in Millions |  | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 01, 2022 | Jun. 30, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Mar. 02, 2020
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |
Plus reinsurance recoverable on unpaid losses at the end of the period |  | $ 4,658.0 | $ 4,897.7 | $ 5,006.5 |
Reinsurance Recoverable, Allowance for Credit Loss |  | 3.3 | 3.7 |  |
Reinsurance Recoverable, Allowance for Credit Loss, Period Increase (Decrease) |  | $ (0.4) | $ 0.4 |  |
Reinsurance Contracts [Axis]: Funds withheld credited with interest for periods after October 1, 2022 |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |
Reinsurance Retention Policy, Retrocession Premium, Interest Rate | 1.75% |  |  |  |
Enstar |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |
Plus reinsurance recoverable on unpaid losses at the end of the period |  |  |  |  | $ 770.0
Enstar | Reinsurance Contracts [Axis]: LPT losses reinsured] |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |
Plus reinsurance recoverable on unpaid losses at the end of the period |  |  |  |  | $ 3,120.0

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- Definition Amount of increase (decrease) in allowance for credit loss on reinsurance recoverable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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- Definition Amount, after valuation allowance, recoverable under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(6)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=99397103&loc=d3e6824-158387 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=99404803&loc=d3e21409-158489 + Details
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