v3.26.1
Capital Structure - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jan. 01, 2025
Nov. 29, 2024
Nov. 26, 2024
Aug. 13, 2019
Sep. 20, 2016
May 02, 2013
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
May 01, 2025
Jan. 02, 2025
Class of Stock [Line Items]                      
Additional paid in capital [1]             $ 803,400 $ 761,700      
Aggregate Liquidation Preference Shares             725,000 1,000,000 $ 775,000    
Preferred Stock Issuance Cost             25,100 29,500 $ 21,500    
Authorized share capital             $ 977 $ 977      
Number of ordinary shares             750,000,000 750,000,000      
Ordinary shares, par value             $ 0.001 $ 0.001   $ 0.001  
Number of preference shares             150,000,000 150,000,000      
Preference shares, par value             $ 0.0015144558        
Ordinary shares, issued             91,838,366 90,833,333      
Preference shares liquidation preference, value     $ 225,000 $ 250,000              
2025 Equity and Incentive Plan                      
Class of Stock [Line Items]                      
Shares Issued, Shares, Share-Based Payment Arrangement, before Forfeiture             1,005,033        
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 0 11,000,000      
Preference shares, rate 5.95% 5.95%       5.95% 5.95% 5.95%      
Redemption price per share           $ 25 $ 25 $ 25     $ 25
Proceeds or share issuance           $ 270,600          
Preference shares liquidation preference, value           $ 275,000         $ 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%        
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%        
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 9,000,000      
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 (1) | Preference shares                      
Class of Stock [Line Items]                      
Proceeds or share issuance       $ 241,600              
[1] Ordinary shares and additional paid-in capital have been retroactively adjusted to reflect the Ordinary Share Exchange, for all periods presented. Refer to Note 12, “Capital Structure” for further details.