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Schedule II - Condensed Financial Information of Registrant Balance Sheets (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Aug. 13, 2019
Sep. 20, 2016
May 02, 2013
Sep. 30, 2024
Dec. 31, 2023
Dec. 31, 2022
Sep. 30, 2023
Dec. 31, 2021
Dec. 31, 2020
ASSETS                  
Cash and cash equivalents         $ 1,028,100 $ 959,200 $ 1,244,900    
Right-of-use operating lease assets       $ 56,000 61,600 72,800      
Other assets       337,400 309,600 384,200      
Total assets       16,104,300 15,224,800 15,157,300      
LIABILITIES                  
Accrued expenses and other payables       248,400 214,400 201,800      
Long-term debt       300,000 300,000 0      
Short-term debt         0 299,900      
Operating lease liabilities       79,600 86,100 95,500      
Total liabilities       13,081,100 12,316,300 12,799,300      
SHAREHOLDERS’ EQUITY                  
Ordinary shares       604 604 604      
Preference shares       753,500 753,500 753,500      
Additional paid in capital       761,200 761,200 761,200      
Retained earnings       1,794,900 1,793,500 1,349,000      
Unrealized (loss)/gains on investments         (227,600) (333,200)      
Total accumulated other comprehensive (loss)       (287,000) (400,300) (506,300) $ (558,400) $ (123,000)  
Total shareholders’ equity         2,908,500 2,358,000      
Total liabilities and shareholders’ equity       $ 16,104,300 $ 15,224,800 $ 15,157,300      
Ordinary shares, issued       60,395,839 60,395,839 60,395,839      
Ordinary shares, par value       $ 0.01 $ 0.01 $ 0.01      
Preference shares, par value       $ 0.0015144558 $ 0.0015144558        
5.950% Preference Shares (AHL PRC)                  
SHAREHOLDERS’ EQUITY                  
Preference shares, issued     11,000,000 11,000,000 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 $ 0.0015144558      
5.625% Preference Shares (AHL PRD)                  
SHAREHOLDERS’ EQUITY                  
Preference shares, issued   10,000,000   10,000,000 10,000,000 10,000,000      
Preference shares, rate   5.625%   5.625% 5.625% 5.625%      
Preference shares, par value       $ 0.0015144558 $ 0.0015144558 $ 0.0015144558      
5.625% Preference Shares (AHL PRE)                  
SHAREHOLDERS’ EQUITY                  
Preference shares, issued 10,000,000     10,000,000 10,000,000 10,000,000      
Preference shares, rate 5.625%     5.625% 5.625% 5.625%      
Preference shares, par value       $ 0.0015144558 $ 0.0015144558 $ 0.0015144558      
Parent Company                  
ASSETS                  
Fixed income maturities, trading at fair value (amortized cost — $1,106.6 and $1,205.0)         $ 43,200 $ 40,500      
Cash and cash equivalents         43,500 44,400   $ 45,000 $ 92,400
Investments in subsidiaries (1)         3,284,200 2,767,900      
Other receivables         4,300 1,700      
Right-of-use operating lease assets         1,500 2,000      
Other assets         5,600 5,900      
Total assets         3,382,300 2,862,400      
LIABILITIES                  
Accrued expenses and other payables         27,800 22,300      
Other Liabilities         144,700 180,500      
Long-term debt         300,000 0      
Short-term debt         0 299,900      
Operating lease liabilities         1,300 1,700      
Total liabilities         473,800 504,400      
SHAREHOLDERS’ EQUITY                  
Ordinary shares         600 600      
Preference shares         753,500 753,500      
Additional paid in capital         761,200 761,200      
Retained earnings         1,793,500 1,349,000      
(Loss)/gain on derivatives         (200) 13,800      
Gains on foreign currency translation (start of period)       $ (172,500) (186,900)        
Gains on foreign currency translation (end of period)         (172,500) (186,900)      
Total accumulated other comprehensive (loss)         (400,300) (506,300)      
Total liabilities and shareholders’ equity         $ 3,382,300 $ 2,862,400