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Capital Structure - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended
Jul. 01, 2023
Jun. 15, 2023
Aug. 13, 2019
Sep. 20, 2016
May 02, 2013
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2020
Dec. 31, 2022
Dec. 31, 2020
Class of Stock [Line Items]                    
Additional paid in capital [1]           $ 761,200     $ 761,200  
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  
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          
5.950% Preference Shares (AHL PRC) | LIBOR | Subsequent Event                    
Class of Stock [Line Items]                    
Preferred Stock Liquidation Preference Value, Fixed for Floating Rate LIBOR                  
5.625% Preference Shares (AHL PRD)                    
Class of Stock [Line Items]                    
Preferred stock issuance cost               $ 8,700    
Preference shares, par value                 $ 0.0015144558  
Preference shares, issued           10,000,000     10,000,000  
Preference shares, rate   5.625%   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% 5.625%      
Redemption price per share     $ 25     $ 25     $ 25  
Additional paid-in capital (1) | Preference shares                    
Class of Stock [Line Items]                    
Proceeds or share issuance     $ 241,600              
[1] (5)    Preference shares of $775.0 million, less issuance costs of $21.5 million (December 31, 2022 — $775.0 million and $21.5 million) were previously presented within additional paid-in capital.