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Schedule II - Condensed Financial Information of Registrant Balance Sheets (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Nov. 29, 2024
Aug. 13, 2019
Sep. 20, 2016
May 02, 2013
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
ASSETS                
Fair Market Value         $ 1,488,700 $ 1,964,400    
Cash and Cash Equivalents, at Carrying Value [1]         914,200 1,028,100    
Right-of-use operating lease assets         53,500 61,600    
Other assets         590,800 309,600    
Total assets         15,748,500 15,224,800    
LIABILITIES                
Accrued expenses and other payables [2]         237,200 214,400    
Short-Term Debt         300,000 300,000    
Operating lease liabilities         75,600 86,100    
Total liabilities         12,376,600 12,316,300    
Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]                
Ordinary shares         604 604    
Preference shares, value         970,500 753,500    
Additional paid in capital         761,200 761,200    
Retained earnings         2,029,700 1,793,500    
Total accumulated other comprehensive (loss)         (390,100) (400,300) $ (506,300)  
Total shareholders’ equity         3,371,900 2,908,500    
Total liabilities and shareholders’ equity         $ 15,748,500 $ 15,224,800    
Ordinary shares, issued         60,395,839 60,395,839    
Ordinary shares, par value         $ 0.01 $ 0.01    
Preference shares, par value         $ 0.0015144558      
5.950% Preference Shares (AHL PRC)                
Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]                
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%    
Preference shares, par value         $ 0.0015144558 $ 0.0015144558    
5.625% Preference Shares (AHL PRD)                
Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]                
Preference shares, issued     10,000,000   10,000,000 10,000,000    
Preference shares, rate     5.625%   5.625% 5.625%    
Preference shares, par value         $ 0.0015144558 $ 0.0015144558    
5.625% Preference Shares (AHL PRE)                
Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]                
Preference shares, issued   10,000,000     10,000,000 10,000,000    
Preference shares, rate   5.625%     5.625% 5.625%    
Preference shares, par value         $ 0.0015144558 $ 0.0015144558    
Parent Company                
ASSETS                
Fair Market Value         $ 44,300 $ 43,200    
Cash and Cash Equivalents, at Carrying Value         43,500 43,500 $ 44,400 $ 45,000
Investments in subsidiaries (1)         3,361,300 3,284,200    
Other Receivables         275,000 0    
Other recievables due from affiliates         20,600 4,300    
Right-of-use operating lease assets         1,000 1,500    
Other assets         44,700 5,600    
Total assets         3,790,400 3,382,300    
LIABILITIES                
Accrued expenses and other payables         20,700 27,800    
Other Liabilities         96,900 144,700    
Long-term debt         300,000 300,000    
Operating lease liabilities         900 1,300    
Total liabilities         418,500 473,800    
Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]                
Ordinary shares         600 600    
Preference shares, value         970,500 753,500    
Additional paid in capital         761,200 761,200    
Retained earnings         2,029,700 1,793,500    
Unrealized (loss)/gains on investments         (198,200) (227,600)    
(Loss)/gain on derivatives         (5,300) (200)    
Gains on foreign currency translation (start of period)         (172,500)      
Gains on foreign currency translation (end of period)         (186,600) (172,500)    
Total accumulated other comprehensive (loss)         (390,100) (400,300)    
Total liabilities and shareholders’ equity         $ 3,790,400 $ 3,382,300    
[1] Cash and cash equivalents includes restricted cash of $181.9 million (2023 — $323.2 million) which are held in trusts.
[2] Includes amounts due to related parties of $4.0 million for investment management fees (2023 — $2.1 million), and $1.3 million for management consulting fees (2023 — $1.2 million).