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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
Dec. 31, 2020
Dec. 31, 2019
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%  
Preference shares, par value     $ 0.0015144558 $ 0.0015144558  
Redemption price per share     $ 25 $ 25 $ 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%  
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