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Capital Structure - Additional Information (Details) $ / shares in Units, $ in Thousands |  |  |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Aug. 13, 2019 USD ($) $ / shares shares | Sep. 20, 2016 USD ($) $ / shares | May 02, 2013 USD ($) $ / shares shares | Jun. 30, 2023 | Dec. 31, 2023 USD ($) $ / shares shares | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Additional paid in capital |  |  |  |  | $ 761,200 | $ 761,200 |  |
Aggregate liquidation preferences |  |  |  |  | 775,000 | 775,000 | $ 775,000 |
Preferred stock issuance cost |  |  |  |  | 21,500 | 21,500 | $ 21,500 |
Authorized share capital |  |  |  |  | $ 745 | $ 745 |  |
Number of ordinary shares | shares |  |  |  |  | 70,000,000 | 70,000,000 |  |
Ordinary shares, par value | $ / shares |  |  |  |  | $ 0.01 | $ 0.01 |  |
Number of preference shares | shares |  |  |  |  | 30,000,000 | 30,000,000 |  |
Preference shares, par value | $ / shares |  |  |  |  | $ 0.0015144558 |  |  |
Ordinary shares, issued | shares |  |  |  |  | 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 | $ / shares |  |  |  |  | $ 0.0015144558 | $ 0.0015144558 |  |
Preference shares, issued | shares |  |  | 11,000,000 |  | 11,000,000 | 11,000,000 |  |
Preference shares, rate |  |  |  |  | 5.95% | 5.95% |  |
Redemption price per share | $ / shares |  |  | $ 25 |  |  |  |  |
Proceeds or share issuance |  |  | $ 270,600 |  |  |  |  |
Preference shares liquidation preference, value |  |  | $ 275,000 |  |  |  |  |
Fixed for floating rate |  |  |  | 0.0959343 |  |  |  |
5.625% Preference Shares (AHL PRD) |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred stock issuance cost |  |  |  |  |  |  |  | $ 8,700
Preference shares, par value | $ / shares |  |  |  |  | $ 0.0015144558 | $ 0.0015144558 |  |
Preference shares, issued | shares |  |  |  |  | 10,000,000 | 10,000,000 |  |
Preference shares, rate |  | 5.625% |  |  | 5.625% | 5.625% |  |
Redemption price per share | $ / shares |  | $ 25 |  |  | $ 25 | $ 25 |  |
Proceeds or share issuance |  | $ 241,300 |  |  |  |  |  |
Preference shares liquidation preference, value |  |  |  |  |  |  |  | $ 250,000
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 | $ / shares |  |  |  |  | $ 0.0015144558 | $ 0.0015144558 |  |
Preference shares, issued | shares | 10,000,000 |  |  |  | 10,000,000 | 10,000,000 |  |
Preference shares, rate | 5.625% |  |  |  | 5.625% | 5.625% |  |
Redemption price per share | $ / shares | $ 25 |  |  |  | $ 25 | $ 25 |  |
Additional paid-in capital | Preference shares |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Proceeds or share issuance | $ 241,600 |  |  |  |  |  |  |

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