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Dividends - Summary of Declared Dividends (Details) - USD ($) |  |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 28, 2023 | Aug. 13, 2019 | Sep. 20, 2016 | May 02, 2013 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividends on preference shares |  |  |  |  | $ 13,773,500 | $ 13,847,200 | $ 11,122,500 | $ 11,122,500 | $ 49,865,700 |  |
Dividends Payable, Date Declared |  |  |  |  | Nov. 30, 2023 | Sep. 01, 2023 | Jun. 01, 2023 | Mar. 01, 2023 |  |  |
Payable Date | Dec. 28, 2023 |  |  |  |  | Oct. 01, 2023 | Jul. 01, 2023 | Apr. 01, 2023 |  |  |
Dividends paid on ordinary shares |  |  |  |  |  |  |  |  | 40,300,000 | $ 40,000,000.0 | $ 0
5.950% Preference Shares (AHL PRC) |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividends on preference shares |  |  |  |  | $ 6,741,900 | $ 6,815,600 | $ 4,090,900 | $ 4,090,900 | $ 21,739,300 |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  | 5.95% |  |  |  |  | 5.95% | 5.95% |
5.625% Preference Shares, rep by Dep Shares (AHL PRE) |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividends on preference shares |  |  |  |  | $ 3,515,600 | 3,515,600 | 3,515,600 | 3,515,600 | $ 14,062,400 |  |
Depositary share dividend |  |  |  |  | $ 0.35156 |  |  |  | $ 0.35156 |  |
Preferred Stock, Dividend Rate, Percentage |  | 5.625% |  |  |  |  |  |  | 5.625% | 5.625% |
5.625% Preference Shares (AHL PRD) |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividends on preference shares |  |  |  |  | $ 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% |

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