v3.26.1
Subsequent Events- Schedule of Dividends Payable (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 04, 2026
Nov. 26, 2024
Aug. 13, 2019
Sep. 20, 2016
Dec. 31, 2025
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Subsequent Event [Line Items]                    
Dividends         $ 10,969,100 $ 10,969,100 $ 10,969,100 $ 12,544,100 $ 45,451,400  
Preference shares | Subsequent Event                    
Subsequent Event [Line Items]                    
Dividends $ 11,000,000.0                  
5.625% Preference Shares (AHL PRD)                    
Subsequent Event [Line Items]                    
Dividends         3,516,000 3,516,000 3,516,000 3,516,000 $ 14,064,000  
Preferred Stock, Dividend Rate, Percentage       5.625%         5.625%  
5.625% Preference Shares (AHL PRD) | Subsequent Event                    
Subsequent Event [Line Items]                    
Preferred Stock, Dividend Rate, Percentage 5.625%                  
Dividend, in usd per share $ 0.3516                  
5.625% Preference Shares (AHL PRD) | Subsequent Event | S2026Q1SeriesEDividends                    
Subsequent Event [Line Items]                    
Payable Date Apr. 01, 2026                  
Dividends Payable, Date Declared Mar. 15, 2026                  
5.625% Preference Shares (AHL PRE)                    
Subsequent Event [Line Items]                    
Dividends         $ 3,515,600 3,515,600 3,515,600 3,515,600 $ 14,062,400  
Preferred Stock, Dividend Rate, Percentage     5.625%           5.625%  
Depositary share dividend         $ 351,600       $ 351,600  
Depositary share interest of 1/1000th in each 5.625%     0.001%              
5.625% Preference Shares (AHL PRE) | Subsequent Event                    
Subsequent Event [Line Items]                    
Preferred Stock, Dividend Rate, Percentage 5.625%                  
Dividend, in usd per share $ 351.56                  
Depositary share dividend $ 0.3516                  
Depositary share interest of 1/1000th in each 5.625% 0.001%                  
5.625% Preference Shares (AHL PRE) | Subsequent Event | S2026Q1SeriesFDividends                    
Subsequent Event [Line Items]                    
Payable Date Apr. 01, 2026                  
Dividends Payable, Date Declared Mar. 15, 2026                  
7.00% Preference Shares, rep by Dep Shares (AHL PRF)                    
Subsequent Event [Line Items]                    
Dividends         $ 3,937,500 $ 3,937,500 $ 3,937,500 $ 5,512,500 $ 17,325,000  
Preferred Stock, Dividend Rate, Percentage   7.00%             7.00% 7.00%
Depositary share dividend         $ 437,500       $ 437,500  
Depositary share interest of 1/1000th in each 5.625%   0.001%                
7.00% Preference Shares, rep by Dep Shares (AHL PRF) | Subsequent Event                    
Subsequent Event [Line Items]                    
Preferred Stock, Dividend Rate, Percentage 7.00%                  
Dividend, in usd per share $ 437.50                  
Depositary share dividend $ 0.4375                  
Depositary share interest of 1/1000th in each 7.00% 0.001%                  
7.00% Preference Shares, rep by Dep Shares (AHL PRF) | Subsequent Event | S2026Q1SeriesGDividends                    
Subsequent Event [Line Items]                    
Payable Date Apr. 01, 2026                  
Dividends Payable, Date Declared Mar. 15, 2026