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Capital Structure - Summary of Authorized and Issued Share Capital (Details)(Phantom) - $ / shares | Sep. 30, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Aug. 13, 2019 | Sep. 20, 2016 | May 02, 2013
--- | --- | --- | --- | --- | --- | ---
Class of Stock [Line Items] |  |  |  |  |  |
Ordinary shares, par value | $ 0.01 | $ 0.01 | $ 0.01 |  |  |
Preference shares, par value | 0.0015144558 | 0.0015144558 |  |  |  |
5.950% Preference Shares (AHL PRC) |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preference shares, par value | 0.0015144558 | 0.0015144558 | 0.0015144558 |  |  |
Redemption price per share |  |  |  |  |  | $ 25
5.625% Preference Shares (AHL PRD) |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preference shares, par value | 0.0015144558 | 0.0015144558 | 0.0015144558 |  |  |
Redemption price per share | 25 | 25 | 25 |  | $ 25 |
5.625% Preference Shares, rep by Dep Shares (AHL PRE) |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preference shares, par value | 0.0015144558 | 0.0015144558 | 0.0015144558 |  |  |
Redemption price per share | $ 25 | $ 25 | $ 25 | $ 25 |  |
Depositary share interest | 0.10% | 0.10% | 0.10% |  |  |

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