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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, 2023
Dec. 31, 2022
Class of Stock [Line Items]          
Additional paid in capital       $ 761,200 $ 761,200
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        
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% 5.95%
Redemption price per share     $ 25    
Proceeds or share issuance     $ 270,600    
Preference shares liquidation preference, value     $ 275,000    
Fixed for floating rate     0.0959343    
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 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