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Capital Structure - Additional Information (Details)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Aug. 13, 2019
USD ($)
$ / shares
shares
Sep. 20, 2016
USD ($)
$ / shares
May 02, 2013
USD ($)
$ / shares
shares
Jun. 30, 2023
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Class of Stock [Line Items]                
Additional paid in capital         $ 761,200 $ 761,200    
Aggregate liquidation preferences         775,000 775,000 $ 775,000  
Preferred stock issuance cost         21,500 21,500 $ 21,500  
Authorized share capital         $ 745 $ 745    
Number of ordinary shares | shares         70,000,000 70,000,000    
Ordinary shares, par value | $ / shares         $ 0.01 $ 0.01    
Number of preference shares | shares         30,000,000 30,000,000    
Preference shares, par value | $ / shares         $ 0.0015144558      
Ordinary shares, issued | shares         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 | $ / shares         $ 0.0015144558 $ 0.0015144558    
Preference shares, issued | shares     11,000,000   11,000,000 11,000,000    
Preference shares, rate         5.95% 5.95%    
Redemption price per share | $ / shares     $ 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 | $ / shares         $ 0.0015144558 $ 0.0015144558    
Preference shares, issued | shares         10,000,000 10,000,000    
Preference shares, rate   5.625%     5.625% 5.625%    
Redemption price per share | $ / shares   $ 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 | $ / shares         $ 0.0015144558 $ 0.0015144558    
Preference shares, issued | shares 10,000,000       10,000,000 10,000,000    
Preference shares, rate 5.625%       5.625% 5.625%    
Redemption price per share | $ / shares $ 25       $ 25 $ 25    
Additional paid-in capital | Preference shares                
Class of Stock [Line Items]                
Proceeds or share issuance $ 241,600