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Reinsurance - Additional Information (Details) - USD ($) $ in Millions |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 01, 2022 | Jan. 10, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | May 30, 2022 | Dec. 31, 2020 | Mar. 02, 2020
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |
Plus reinsurance recoverable on unpaid losses at the end of the year |  |  | $ 4,897.7 | $ 3,298.1 |  | $ 3,195.2 |
Reinsurance Recoverable, Allowance for Credit Loss |  |  | 3.7 | 3.3 |  | $ 3.8 |
Reinsurance Recoverable, Allowance for Credit Loss, Period Increase (Decrease) |  |  | $ 0.4 | $ (0.5) |  |  |
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% |  |  |  |  |  |
Reinsurance Contracts [Axis]: LPT |  |  |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |
Reinsurance recoverables, premium paid and recognized |  |  |  |  | $ 1,840.1 |  |
Enstar |  |  |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |
Plus reinsurance recoverable on unpaid losses at the end of the year |  |  |  |  |  |  | $ 770.0
Enstar | Reinsurance Contracts [Axis]: LPT net losses reinsured |  |  |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |
Reinsurance, Excess Retention, Amount Reinsured, Per Event |  | $ 3,120.0 |  |  |  |  |
Enstar | Reinsurance Contracts [Axis]: LPT premium paid |  |  |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |
Reinsurance Recoverables for Unpaid Claims and Claims Adjustment, Ceded Claims Gross |  | 3,160.0 |  |  |  |  |
Maximum | Reinsurance Contracts [Axis]: Loss Portfolio Transfer Agreement Limit |  |  |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |
Reinsurance, Amount Retained, Per Event |  | $ 3,570.0 |  |  |  |  |

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- Definition Reinsurance Recoverables for Unpaid Claims and Claims Adjustments, Ceded Cumulative Losses + References No definition available. + Details
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- Definition Reinsurance recoverables, including premium paid and recognized + References No definition available. + Details
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- Definition Reinsurance Retention Policy, Retrocession Premium, Interest Rate + References No definition available. + Details
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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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- Definition Amount of allowance for credit loss on reinsurance recoverable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 + Details
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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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