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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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