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Capital Structure - Summary of Authorized and Issued Share Capital (Details) - USD ($) | Dec. 31, 2019 | Aug. 13, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | May 02, 2013
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Authorized share capital: |  |  |  |  |
Number of ordinary shares | 70,000,000 |  | 969,629,030 |  |
Number of non-voting shares | 0 |  | 6,787,880 |  |
Number of preference shares | 30,000,000 |  | 100,000,000 |  |
Ordinary Shares, authorized | $ 700,000 |  | $ 1,469,000 |  |
Non-Voting Shares, authorized | 0 |  | 10,000 |  |
Preference Shares, authorized | 45,000 |  | 152,000 |  |
Total authorized share capital | $ 745,434 |  | 1,631,000 |  |
Issued share capital: |  |  |  |  |
Ordinary shares, issued | 60,395,839 |  |  |  |
Ordinary shares, value | $ 604,000 |  | $ 90,000 |  |
Previous Common Stock Shares Issued | 0 |  | 59,743,156 | 59,474,085 |
Total issued share capital | $ 636,000 |  | $ 122,000 |  |
5.950% Preference Shares (AHL PRC) |  |  |  |  |
Issued share capital: |  |  |  |  |
Preference shares, issued | 11,000,000 |  | 11,000,000 |  | 11,000,000
Preference shares, value | $ 17,000 |  | $ 17,000 |  |
Preference shares, rate | 5.95% |  | 5.95% |  |
5.625% Preference Shares (AHL PRD) |  |  |  |  |
Issued share capital: |  |  |  |  |
Preference shares, issued | 10,000,000 |  | 10,000,000 |  |
Preference shares, value | $ 15,000 |  | $ 15,000 |  |
Preference shares, rate | 5.625% |  | 5.625% |  |
5.625% Preference Shares, rep by Dep Shares (AHL PRE) |  |  |  |  |
Issued share capital: |  |  |  |  |
Preference shares, issued | 10,000,000 | 10,000,000 | 0 |  |
Preference shares, value | $ 0 |  | $ 0 |  |
Preference shares, rate | 5.625% |  | 0.00% |  |

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