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Reserve for Claims and Claim Expenses (Cumulative Number of Claims Reported) (Details) - Excess of Loss Reinsurance Contracts	Dec. 31, 2020 claim
Accident Year 2011 | Property
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	1,394
Accident Year 2011 | Casualty and Specialty
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	2,014
Accident Year 2012 | Property
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	922
Accident Year 2012 | Casualty and Specialty
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	2,402
Accident Year 2013 | Property
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	803
Accident Year 2013 | Casualty and Specialty
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	2,877
Accident Year 2014 | Property
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	762
Accident Year 2014 | Casualty and Specialty
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	3,666
Accident Year 2015 | Property
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	772
Accident Year 2015 | Casualty and Specialty
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	4,090
Accident Year 2016 | Property
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	1,178
Accident Year 2016 | Casualty and Specialty
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	4,600
Accident Year 2017 | Property
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	2,529
Accident Year 2017 | Casualty and Specialty
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	3,934
Accident Year 2018 | Property
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	2,418
Accident Year 2018 | Casualty and Specialty
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	2,973
Accident Year 2019 | Property
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	1,493
Accident Year 2019 | Casualty and Specialty
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	2,080
Accident Year 2020 | Property
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	1,297
Accident Year 2020 | Casualty and Specialty
Claims Development [Line Items]
Cumulative number of reported claims (in claims)	612

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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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