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Reserve for Claims and Claim Expenses (Prior Year Development of the Reserve for Net Claims and Claim Expenses) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years $ (147,650) $ (53,877) $ (208,711) $ (55,383)
Change In Actuarial Assumption        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years       5,445
Property        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (202,080) (31,556)
Property | Large and Small Catastrophe Events and Attritional Loss Movements        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (202,080) (37,001)
Property | Large catastrophe events        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (160,586) (23,577)
Property | 2020 Large Loss Events        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     16,939  
Property | 2019 Large Loss Events        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (40,582) (13,435)
Property | 2018 Large Loss Events        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (99,337) (12,306)
Property | 2017 Large Loss Events        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (38,220) (9,101)
Property | Other        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     614 11,265
Property | Small catastrophe events and attritional loss movements        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (41,494) (13,424)
Property | Other small catastrophe events and attritional loss movements        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (41,494) (13,424)
Property | Operating Segments        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years (145,935) (38,849) (202,080) (31,556)
Casualty and Specialty        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (6,631) (23,827)
Casualty and Specialty | Actuarial methods - actual reported claims less than expected claims        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     (9,612) (27,944)
Casualty and Specialty | Change In Actuarial Assumption        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years     2,981 4,117
Casualty and Specialty | Operating Segments        
Liability for Catastrophe Claims [Line Items]        
Net claims and claim expenses incurred – prior accident years $ (1,715) $ (15,028) $ (6,631) $ (23,827)