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