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Collateralized Reinsurance And Trust Agreements (Narrative) (Details) - USD ($) $ in Millions |  | 6 Months Ended |
--- | --- | --- | ---
Apr. 01, 2018 | Jun. 30, 2022 | Dec. 31, 2021
Effects of Reinsurance [Line Items] |  |  |
Amount on deposit in trust accounts |  | $ 2.0 |
Preferred shares |  |  |
Reinsurance recoverable |  | 181.2 | 206.1
Deferred gain liability |  | $ 14.2 | $ 15.5
Mt Logan Re [Member] |  |  |
Effects of Reinsurance [Line Items] |  |  |
Percentage of voting common shares owned by Group |  | 100.00% |
Retrocede amount | $ 269.2 |  |
Cash transferred | 252.0 |  |
Mt Logan Re [Member] | Minimum [Member] |  |  |
Effects of Reinsurance [Line Items] |  |  |
Accident year |  | 2002 |
Mt Logan Re [Member] | Maximum [Member] |  |  |
Effects of Reinsurance [Line Items] |  |  |
Accident year |  | 2015 |
Liability retroceded | $ 319.0 |  |

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- Definition Amount before valuation allowance recoverable 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 326 -SubTopic 20 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919253-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953401-111524 + Details
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