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Capital Structure - Summary of Authorized and Issued Share Capital (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Aug. 13, 2019
Sep. 20, 2016
May 02, 2013
Dec. 31, 2023
Dec. 31, 2022
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 $ 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
Preference shares, value       $ 15 $ 15
Preferred Stock, Dividend Rate, Percentage   5.625%   5.625% 5.625%
Preference shares, par value       $ 0.0015144558 $ 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%
Preference shares, par value       $ 0.0015144558 $ 0.0015144558
Redemption price per share $ 25     $ 25 $ 25