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Related Party Transactions (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2017
Related Party Transaction [Line Items]          
Reinsurance balances receivable   $ 3,342,612 $ 3,063,153    
Non-life reserves   12,725,631 12,047,792    
Life and health reserves   2,510,293 2,638,086    
Unearned premiums   2,745,371 2,501,161    
Private equity funds | Exor          
Related Party Transaction [Line Items]          
Investment carrying value   396,000      
Public equity funds | Exor          
Related Party Transaction [Line Items]          
Investment carrying value   422,000      
Majority Shareholder | Exor          
Related Party Transaction [Line Items]          
Related Party Advisory Services Agreement   184 350 $ 500  
Majority Shareholder | Real estate services | Exor          
Related Party Transaction [Line Items]          
Related Party Consulting Services Agreement   265 433 310  
Majority Shareholder | Investment advisory services | Exor          
Related Party Transaction [Line Items]          
Related Party Consulting Services Agreement   3,900 2,600    
Related Party Advisory Services Agreement     175 259  
Majority Shareholder | Underwriting Activities | Covea          
Related Party Transaction [Line Items]          
Reinsurance balances receivable   3,169      
Non-life reserves   95,013      
Life and health reserves   1,175      
Unearned premiums   571      
Majority Shareholder | Private equity funds | Exor          
Related Party Transaction [Line Items]          
Investment carrying value     468,000    
Net realized and unrealized gain (loss) on related party investment $ 34,000 72,000 115,000    
Majority Shareholder | Other invested assets | Exor          
Related Party Transaction [Line Items]          
Investment carrying value     51,000    
Transaction amount     51,000    
Majority Shareholder | Public equity funds | Exor          
Related Party Transaction [Line Items]          
Investment carrying value     1,154,000    
Payments to acquire investments         $ 500,000
Transaction amount 772,000        
Net realized and unrealized gain (loss) on related party investment 24,000 40,000 115,000 91,000  
Realized gain (loss) on related party investment $ 450,000        
Retained earnings          
Related Party Transaction [Line Items]          
Dividends on common shares   177,894 106,667 $ 50,000  
Retained earnings | Majority Shareholder | Exor          
Related Party Transaction [Line Items]          
Dividends on common shares   $ 178,000 $ 107,000