v3.26.1
History, Organization and Business Combination Narrative (Details) - $ / shares
12 Months Ended
Mar. 04, 2026
May 08, 2025
Nov. 26, 2024
Aug. 13, 2019
Sep. 20, 2016
Dec. 31, 2025
Dec. 31, 2024
Feb. 24, 2026
May 01, 2025
Class of Stock [Line Items]                  
Ordinary shares, par value           $ 0.001 $ 0.001   $ 0.001
Subsidiary, Sale of Stock [Line Items]                  
Percentage of ownership after transaction   82.10%              
Aspen Insurance Holdings Limited                  
Class of Stock [Line Items]                  
Business acquisition, share price           $ 37.50      
Aspen Insurance Holdings Limited | Subsequent Event                  
Class of Stock [Line Items]                  
Ordinary shares, par value               $ 1.00  
IPO                  
Subsidiary, Sale of Stock [Line Items]                  
Number of sale of shares in IPO   13,250,000              
Over-Allotment Option                  
Subsidiary, Sale of Stock [Line Items]                  
Number of sale of shares in IPO   1,987,500              
5.625% Preference Shares (AHL PRD)                  
Class of Stock [Line Items]                  
Preference shares, rate         5.625% 5.625%      
5.625% Preference Shares (AHL PRD) | Subsequent Event                  
Class of Stock [Line Items]                  
Preference shares, rate 5.625%                
5.625% Preference Shares (AHL PRE)                  
Class of Stock [Line Items]                  
Preference shares, rate       5.625%   5.625%      
5.625% Preference Shares (AHL PRE) | Subsequent Event                  
Class of Stock [Line Items]                  
Preference shares, rate 5.625%                
7.00% Preference Shares, rep by Dep Shares (AHL PRF)                  
Class of Stock [Line Items]                  
Preference shares, rate     7.00%     7.00% 7.00%    
7.00% Preference Shares, rep by Dep Shares (AHL PRF) | Subsequent Event                  
Class of Stock [Line Items]                  
Preference shares, rate 7.00%