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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 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses $ (42,957) $ (52,029) $ (60,790) $ (61,061)
Property        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (51,810) (56,145)
Property | Large and Small Catastrophe Events and Attritional Loss Movements        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (51,810) (56,145)
Property | Large catastrophe events        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (67,344) (31,103)
Property | 2021 Weather-Related Large Loss Events        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     4,385  
Property | 2020 Weather-Related Large Loss Events        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (10,887) 16,932
Property | 2019 Large Loss Events        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (25,821) (1,424)
Property | 2018 Large Loss Events        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (10,300) (37,910)
Property | 2017 Large Loss Events        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (22,143) (5,708)
Property | Other        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (2,578) (2,993)
Property | Small catastrophe events and attritional loss movements        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     15,534 (25,042)
Property | Other small catastrophe events and attritional loss movements        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     15,534 (25,042)
Property | Operating Segments        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses (35,052) (50,983) (51,810) (56,145)
Casualty and Specialty        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (8,980) (4,916)
Casualty and Specialty | Actuarial methods - actual reported claims less than expected claims        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     (27,315) (4,916)
Casualty and Specialty | Actuarial assumption changes        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses     18,335 0
Casualty and Specialty | Operating Segments        
Liability for Catastrophe Claims [Line Items]        
Net (favorable) adverse development of prior accident years net claims and claim expenses $ (7,905) $ (1,046) $ (8,980) $ (4,916)