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Capital Structure - Additional Information (Details) - USD ($) |  |  |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 28, 2020 | Aug. 13, 2019 | Jan. 03, 2017 | Sep. 20, 2016 | Jul. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jul. 03, 2017 | May 02, 2013
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Additional paid in capital |  |  |  |  |  | $ 1,201,700,000 | $ 967,500,000 |  |  |  |
Aggregate liquidation preferences |  |  |  |  |  | 775,000,000 | 525,000,000 |  |  |  |
Preferred stock issuance cost |  |  |  |  |  | 21,500,000 | 13,100,000 |  |  |  |
Authorized share capital |  |  |  |  |  | $ 745,434 | $ 1,631,000 |  |  |  |
Number of ordinary shares |  |  |  |  |  | 70,000,000 | 969,629,030 |  |  |  |
Ordinary shares, par value |  |  |  |  |  | $ 0.01 | $ 0.0015144558 |  |  |  |
Number of preference shares |  |  |  |  |  | 30,000,000 | 100,000,000 |  |  |  |
Preference shares, par value |  |  |  |  |  | $ 0.0015144558 | $ 0.0015144558 |  |  |  |
Ordinary shares, issued |  |  |  |  |  | 60,395,839 |  |  |  |  |
Preferred Stock, Redemption Amount |  |  | $ 133,200,000 |  |  |  |  |  |  | $ 160,000,000 | $ 275,000,000
Redemption price per share |  |  |  |  |  | $ 25 | 25 |  |  |  |
Preference shares liquidation preference, value |  | $ 250,000,000 |  |  |  |  |  |  | $ 250,000,000 |  |
5.950% Preference Shares (AHL PRC) |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preference shares, par value |  |  |  |  |  | $ 0.0015144558 | $ 0.0015144558 |  |  |  |
Preference shares, issued |  |  |  |  |  | 11,000,000 | 11,000,000 |  |  |  | 11,000,000
Preference shares, rate |  |  |  |  |  | 5.95% | 5.95% |  |  |  |
Redemption price per share |  |  |  |  |  | $ 25 | $ 25 |  |  |  | $ 25
5.625% Preference Shares (AHL PRD) |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock issuance cost |  |  |  |  |  |  |  |  | $ 8,700,000 |  |
Preference shares, par value |  |  |  |  |  | $ 0.0015144558 | $ 0.0015144558 |  |  |  |
Preference shares, issued |  |  |  |  |  | 10,000,000 | 10,000,000 |  |  |  |
Preference shares, rate | 5.625% |  |  | 5.625% |  | 5.625% | 5.625% |  |  |  |
Redemption price per share |  |  |  |  |  | $ 25 | $ 25 |  | $ 25 |  |
5.625% Preference Shares, rep by Dep Shares (AHL PRE) |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock issuance cost |  | $ 8,400,000 |  |  |  |  |  |  |  |  |
Preference shares, par value |  |  |  |  |  | $ 0.0015144558 | $ 0 |  |  |  |
Preference shares, issued |  | 10,000,000 |  |  |  | 10,000,000 | 0 |  |  |  |
Preference shares, rate | 5.625% | 5.625% |  |  |  | 5.625% | 0.00% |  |  |  |
Redemption price per share |  | $ 25 |  |  |  | $ 25 | $ 0 |  |  |  |
7.401% Preference Shares |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preference shares, rate |  |  | 7.401% |  |  |  |  | 7.401% |  |  |
Redemption price per share |  |  |  |  |  |  |  |  |  | $ 25 |
7.250% Preference Shares |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preference shares, rate |  |  |  |  | 7.25% |  |  | 7.25% |  |  |
Additional paid-in capital | Preference Shares |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds or share issuance |  |  |  |  |  | $ 241,600,000 | $ 0 | $ 0 |  |  |
Preference shares redeemed and cancelled |  |  |  |  |  | $ 0 | $ 0 | $ (293,200,000) | $ (293,200,000) |  |

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