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Capital Structure - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Nov. 29, 2024
Nov. 26, 2024
Aug. 13, 2019
Sep. 20, 2016
May 02, 2013
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Class of Stock [Line Items]                
Additional paid in capital           $ 761,200 $ 761,200  
Aggregate Liquidation Preference Shares           1,000,000 775,000 $ 775,000
Preferred Stock Issuance Cost           29,500 21,500 $ 21,500
Authorized share capital           $ 7,727 $ 745  
Number of ordinary shares           750,000,000 70,000,000  
Ordinary shares, par value           $ 0.01 $ 0.01  
Number of preference shares           150,000,000 30,000,000  
Preference shares, par value           $ 0.0015144558    
Ordinary shares, issued           60,395,839 60,395,839  
Preference shares liquidation preference, value   $ 225,000 $ 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         11,000,000,000,000 11,000,000 11,000,000  
Preference shares, rate 5.95%       5.95% 5.95% 5.95%  
Redemption price per share         $ 25 $ 25 $ 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 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     $ 25,000 $ 25,000  
7.00% Preference Shares, rep by Dep Shares (AHL PRF)                
Class of Stock [Line Items]                
Preferred Stock Issuance Cost   $ 8,000            
Preference shares, par value           $ 0.0015144558 $ 0.0015144558  
Preference shares, issued   9,000,000       9,000,000 0  
Preference shares, rate   7.00%       7.00% 7.00%  
Redemption price per share   $ 25       $ 25,000 $ 25,000  
Proceeds or share issuance   $ 217,000            
Additional paid-in capital | Preference shares                
Class of Stock [Line Items]                
Proceeds or share issuance     $ 241,600