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Capital Structure - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 01, 2024
Aug. 13, 2019
Sep. 20, 2016
May 02, 2013
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Class of Stock [Line Items]                    
Additional paid in capital         $ 761,200   $ 761,200 $ 761,200 $ 761,200  
Preferred stock issuance cost         21,500 $ 21,500   21,500 21,500 $ 21,500
Authorized share capital         $ 7,727   $ 7,727 $ 745 $ 745  
Number of ordinary shares         750,000,000   750,000,000 70,000,000 70,000,000  
Ordinary shares, par value         $ 0.01   $ 0.01 $ 0.01 $ 0.01  
Number of preference shares         150,000,000   150,000,000 30,000,000 30,000,000  
Preference shares, par value         $ 0.0015144558   $ 0.0015144558 $ 0.0015144558    
Ordinary shares, issued         60,395,839   60,395,839 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   $ 0.0015144558 $ 0.0015144558 $ 0.0015144558  
Preference shares, issued       11,000,000 11,000,000   11,000,000 11,000,000 11,000,000  
Preference shares, rate       5.95%     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) | Subsequent Event                    
Class of Stock [Line Items]                    
Preference shares, rate 5.95%                  
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 $ 0.0015144558 $ 0.0015144558  
Preference shares, issued     10,000,000   10,000,000   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 $ 25 $ 25  
Proceeds or share issuance     $ 241,300              
Preference shares liquidation preference, value     $ 250,000              
5.625% Preference Shares (AHL PRD) | Subsequent Event                    
Class of Stock [Line Items]                    
Preference shares, rate 5.625%                  
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 $ 0.0015144558 $ 0.0015144558  
Preference shares, issued   10,000,000     10,000,000   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 $ 25 $ 25  
Depositary share interest         0.10%   0.10% 0.10% 0.10%  
5.625% Preference Shares, rep by Dep Shares (AHL PRE) | Subsequent Event                    
Class of Stock [Line Items]                    
Preference shares, rate 5.625%                  
Depositary share interest 0.10%                  
Additional paid-in capital | Preference shares                    
Class of Stock [Line Items]                    
Proceeds or share issuance   $ 241,600