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Reinsurance - Additional Information (Details) - USD ($) $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 02, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |
Plus reinsurance recoverable on unpaid losses at the end of the year |  | $ 3,298.1 | $ 3,195.2 | $ 2,319.8 |
Deferred Gain on Reinsurance |  | 58.3 | 0.0 | 0.0 |
Amortization of deferred gains on reinsurance |  | 9.8 |  |  |
Reinsurance Recoverable, Allowance for Credit Loss |  | 3.3 | 3.8 | 3.7 |
Reinsurance Recoverable, Allowance for Credit Loss, Period Increase (Decrease) |  | (0.5) | 0.1 |  |
ADC |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |
Plus reinsurance recoverable on unpaid losses at the end of the year |  |  | 2,518.3 | 2,425.2 | $ 2,319.8
Reinsurance recoverables, premium paid and recognized |  | $ 68.1 | $ 0.0 | $ 0.0 |
Enstar |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |
Plus reinsurance recoverable on unpaid losses at the end of the year | $ 770.0 |  |  |  |
Second coverage | 250.0 |  |  |  |
Maximum | Enstar |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |
Reinsurance retention policy, amount retained | 4,575.0 |  |  |  |
Reinsurance retention policy, second amount retained | 5,065.0 |  |  |  |
Minimum | Enstar |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |
Reinsurance retention policy, amount retained | 3,805.0 |  |  |  |
Reinsurance retention policy, second amount retained | $ 4,815.0 |  |  |  |

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- Definition Deferred Gain on Retroactive Reinsurance + 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 Recoverables, Including Reinsurance Premium Paid, Second Tier + References No definition available. + Details
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- Definition Reinsurance Retention Policy, Amount Retained, Second Tier + References No definition available. + 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 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 http://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 http://asc.fasb.org/extlink&oid=120400017&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 http://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 http://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 http://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 http://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 http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 + Details
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