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Collateralized Reinsurance And Trust Agreements (Narrative) (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Apr. 01, 2018 | Dec. 31, 2021 | Dec. 31, 2020
Effects of Reinsurance [Line Items] |  |  |
Amount on deposit in trust accounts |  | $ 1,700.0 |
Preferred shares |  |  |
Reinsurance recoverable |  | 206.1 | 254.9
Deferred gain liability |  | $ 15.5 | 38.8
Mt Logan Re [Member] |  |  |
Effects of Reinsurance [Line Items] |  |  |
Percentage of voting common shares owned by Group |  | 100.00% |
Assumed net risk exposures |  | $ 930.0 | 806.6
Net risk exposure investments |  | $ 66.3 | $ 67.6
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 Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13537-108611 + Details
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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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