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Capital Structure - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 15, 2023
Aug. 13, 2019
Sep. 20, 2016
May 02, 2013
Jun. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Class of Stock [Line Items]                  
Additional paid in capital           $ 1,514,700 $ 1,514,700    
Aggregate liquidation preferences         $ 775,000 775,000 775,000    
Preferred stock issuance cost         21,500 21,500 21,500    
Authorized share capital         $ 745 $ 745 $ 745    
Number of ordinary shares         70,000,000 70,000,000 70,000,000    
Ordinary shares, par value         $ 0.01 $ 0.01 $ 0.01    
Number of preference shares         30,000,000 30,000,000 30,000,000    
Preference shares, par value         $ 0.0015144558 $ 0.0015144558      
Ordinary shares, issued         60,395,839 60,395,839 60,395,839    
Preference shares liquidation preference, value   $ 250,000              
Capital contribution           $ 0 $ 45,000 $ 268,000  
5.950% Preference Shares (AHL PRC)                  
Class of Stock [Line Items]                  
Preferred stock issuance cost       $ 4,400          
Preference shares, par value         $ 0.0015144558 $ 0.0015144558 $ 0.0015144558    
Preference shares, issued       11,000,000 11,000,000 11,000,000 11,000,000    
Preference shares, rate 5.95%       5.95% 5.95% 5.95%    
Redemption price per share       $ 25          
Proceeds or share issuance       $ 270,600          
Preference shares liquidation preference, value       $ 275,000          
5.625% Preference Shares (AHL PRD)                  
Class of Stock [Line Items]                  
Preferred stock issuance cost     $ 8,700           $ 8,700
Preference shares, par value         $ 0.0015144558 $ 0.0015144558 $ 0.0015144558    
Preference shares, issued     10,000,000   10,000,000 10,000,000 10,000,000    
Preference shares, rate 5.625%   5.625%   5.625% 5.625% 5.625%    
Redemption price per share     $ 25   $ 25 $ 25 $ 25    
Proceeds or share issuance     $ 241,300            
Preference shares liquidation preference, value     $ 250,000           $ 250,000
5.625% Preference Shares, rep by Dep Shares (AHL PRE)                  
Class of Stock [Line Items]                  
Preferred stock issuance cost   $ 8,400              
Preference shares, par value         $ 0.0015144558 $ 0.0015144558 $ 0.0015144558    
Preference shares, issued   10,000,000     10,000,000 10,000,000 10,000,000    
Preference shares, rate 5.625% 5.625%     5.625% 5.625% 5.625%    
Redemption price per share   $ 25     $ 25 $ 25 $ 25    
Additional paid-in capital | Preference shares                  
Class of Stock [Line Items]                  
Proceeds or share issuance   $ 241,600