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Capital Structure - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Jul. 01, 2023
Jun. 15, 2023
Mar. 15, 2023
Aug. 13, 2019
Sep. 20, 2016
May 02, 2013
Jun. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2019
Class of Stock [Line Items]                    
Additional paid in capital               $ 1,514,700 $ 1,514,700  
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            
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        
5.950% Preference Shares (AHL PRC) | Subsequent Event                    
Class of Stock [Line Items]                    
Preference shares, rate     5.95%              
5.950% Preference Shares (AHL PRC) | LIBOR | Subsequent Event                    
Class of Stock [Line Items]                    
Preferred Stock Liquidation Preference Value, Fixed for Floating Rate LIBOR                  
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 (AHL PRD) | Subsequent Event                    
Class of Stock [Line Items]                    
Preference shares, rate     5.625%              
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  
5.625% Preference Shares, rep by Dep Shares (AHL PRE) | Subsequent Event                    
Class of Stock [Line Items]                    
Preference shares, rate     5.625%              
Additional paid-in capital | Preference shares                    
Class of Stock [Line Items]                    
Proceeds or share issuance       $ 241,600