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Capital Structure - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Aug. 13, 2019
Sep. 20, 2016
May 02, 2013
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Class of Stock [Line Items]              
Additional paid in capital       $ 1,514,700 $ 1,514,700    
Aggregate liquidation preferences       775,000 775,000    
Preferred stock issuance cost       21,500 21,500    
Authorized share capital       $ 745 $ 745    
Number of ordinary shares       70,000,000 70,000,000    
Ordinary shares, par value       $ 0.01 $ 0.01    
Number of preference shares       30,000,000 30,000,000    
Preference shares, par value       $ 0.0015144558      
Ordinary shares, issued       60,395,839 60,395,839    
Preference shares liquidation preference, value $ 250,000            
Capital contribution       $ 0 $ 45,000 $ 268,000  
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    
Preference shares, issued     11,000,000 11,000,000 11,000,000    
Preference shares, rate       5.95% 5.95%    
Redemption price per share     $ 25        
Proceeds or share issuance     $ 270,600        
Preference shares liquidation preference, value     $ 275,000        
5.625% Preference Shares (AHL PRD)              
Class of Stock [Line Items]              
Preferred stock issuance cost             $ 8,700
Preference shares, par value       $ 0.0015144558 $ 0.0015144558    
Preference shares, issued       10,000,000 10,000,000    
Preference shares, rate   5.625%   5.625% 5.625%    
Redemption price per share   $ 25   $ 25 $ 25    
Proceeds or share issuance   $ 241,300          
Preference shares liquidation preference, value             $ 250,000
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    
Preference shares, issued 10,000,000     10,000,000 10,000,000    
Preference shares, rate 5.625%     5.625% 5.625%    
Redemption price per share $ 25     $ 25 $ 25    
Additional paid-in capital | Preference shares              
Class of Stock [Line Items]              
Proceeds or share issuance $ 241,600