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Capital Structure - Summary of Authorized and Issued Share Capital (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 13, 2019 | Sep. 20, 2016 | Dec. 31, 2020 | Dec. 31, 2019 | May 02, 2013
Authorized share capital: |  |  |  |  |
Number of ordinary shares |  |  | 70,000,000 | 70,000,000 |
Number of preference shares |  |  | 30,000,000 | 30,000,000 |
Ordinary Shares, authorized |  |  | $ 700 | $ 700 |
Preference Shares, authorized |  |  | 45 | 45 |
Total authorized share capital |  |  | $ 745 | $ 745 |
Issued share capital: |  |  |  |  |
Ordinary shares, issued |  |  | 60,395,839 | 60,395,839 |
Ordinary shares, value |  |  | $ 604 | $ 604 |
Total issued share capital |  |  | $ 636 | $ 636 |
Ordinary shares, par value |  |  | $ 0.01 | $ 0.01 |
Preference shares, par value |  |  | $ 0.0015144558 |  |
5.950% Preference Shares (AHL PRC) |  |  |  |  |
Issued share capital: |  |  |  |  |
Preference shares, issued |  |  | 11,000,000 | 11,000,000 | 11,000,000
Preference shares, value |  |  | $ 17 | $ 17 |
Preferred Stock, Dividend Rate, Percentage |  |  | 5.95% | 5.95% |
Preference shares, par value |  |  | $ 0.0015144558 | $ 0.0015144558 |
Redemption price per share |  |  | $ 25 | $ 25 | $ 25
5.625% Preference Shares (AHL PRD) |  |  |  |  |
Issued share capital: |  |  |  |  |
Preference shares, issued |  |  | 10,000,000 | 10,000,000 |
Preference shares, value |  |  | $ 15 | $ 15 |
Preferred Stock, Dividend Rate, Percentage |  | 5.625% | 5.625% | 5.625% |
Preference shares, par value |  |  | $ 0.0015144558 | $ 0.0015144558 |
Redemption price per share |  | $ 25 | $ 25 | $ 25 |
5.625% Preference Shares, rep by Dep Shares (AHL PRE) |  |  |  |  |
Issued share capital: |  |  |  |  |
Preference shares, issued | 10,000,000 |  | 10,000,000 | 10,000,000 |
Preference shares, value |  |  | $ 0 | $ 0 |
Preferred Stock, Dividend Rate, Percentage | 5.625% |  | 5.625% | 5.625% |
Preference shares, par value |  |  | $ 0.0015144558 | $ 0.0015144558 |
Redemption price per share | $ 25 |  | $ 25 | $ 25 |

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