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Capital Structure - Summary of Authorized and Issued Share Capital (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Jun. 15, 2023
Aug. 13, 2019
Sep. 20, 2016
Jun. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
May 02, 2013
Authorized share capital:              
Number of ordinary shares       70,000,000 70,000,000 70,000,000  
Number of preference shares       30,000,000 30,000,000 30,000,000  
Ordinary Shares, authorized       $ 700 $ 700 $ 700  
Preference Shares, authorized       45 45 45  
Total authorized share capital       $ 745 $ 745 $ 745  
Issued share capital:              
Ordinary shares, issued       60,395,839 60,395,839 60,395,839  
Ordinary shares, value       $ 604 $ 604 $ 604  
Total issued share capital       $ 636 $ 636 $ 636  
Ordinary shares, par value       $ 0.01 $ 0.01 $ 0.01  
Preference shares, par value       $ 0.0015144558 $ 0.0015144558    
5.950% Preference Shares (AHL PRC)              
Issued share capital:              
Preference shares, issued       11,000,000 11,000,000 11,000,000 11,000,000
Preference shares, value       $ 17 $ 17 $ 17  
Preferred Stock, Dividend Rate, Percentage 5.95%     5.95% 5.95% 5.95%  
Preference shares, par value       $ 0.0015144558 $ 0.0015144558 $ 0.0015144558  
Redemption price per share             $ 25
5.625% Preference Shares (AHL PRD)              
Issued share capital:              
Preference shares, issued     10,000,000 10,000,000 10,000,000 10,000,000  
Preference shares, value       $ 15 $ 15 $ 15  
Preferred Stock, Dividend Rate, Percentage 5.625%   5.625% 5.625% 5.625% 5.625%  
Preference shares, par value       $ 0.0015144558 $ 0.0015144558 $ 0.0015144558  
Redemption price per share     $ 25 $ 25 $ 25 $ 25  
5.625% Preference Shares, rep by Dep Shares (AHL PRE)              
Issued share capital:              
Preference shares, issued   10,000,000   10,000,000 10,000,000 10,000,000  
Preference shares, value       $ 0 $ 0 $ 0  
Preferred Stock, Dividend Rate, Percentage 5.625% 5.625%   5.625% 5.625% 5.625%  
Preference shares, par value       $ 0.0015144558 $ 0.0015144558 $ 0.0015144558  
Redemption price per share   $ 25   $ 25 $ 25 $ 25