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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 |  |  |  |  |  |  |  |

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- Details
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