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Reserve for Claims and Claim Expenses (Cumulative Number of Claims Reported) (Details) - Excess of Loss Reinsurance Contracts	Dec. 31, 2021 claim
Property | Accident Year 2012
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	922
Property | Accident Year 2013
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	812
Property | Accident Year 2014
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	762
Property | Accident Year 2015
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	783
Property | Accident Year 2016
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	1,206
Property | Accident Year 2017
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	2,596
Property | Accident Year 2018
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	2,516
Property | Accident Year 2019
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	1,704
Property | Accident Year 2020
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	2,298
Property | Accident Year 2021
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	1,203
Casualty and Specialty | Accident Year 2012
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	2,559
Casualty and Specialty | Accident Year 2013
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	3,030
Casualty and Specialty | Accident Year 2014
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	3,914
Casualty and Specialty | Accident Year 2015
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	4,419
Casualty and Specialty | Accident Year 2016
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	5,164
Casualty and Specialty | Accident Year 2017
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	4,753
Casualty and Specialty | Accident Year 2018
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	3,921
Casualty and Specialty | Accident Year 2019
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	3,392
Casualty and Specialty | Accident Year 2020
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	1,777
Casualty and Specialty | Accident Year 2021
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	725

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+ References

No definition available.

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- Definition

Cumulative number of reported claims for short-duration insurance contracts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 4D
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=116884468&loc=SL65671317-158438

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