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Dividends - Summary of Declared Dividends (Details) - USD ($) |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Aug. 13, 2019 | Sep. 20, 2016 | May 02, 2013 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Q1 2023 |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |
Dividend, ordinary shares, in usd per share |  |  |  |  |  | $ 0.41 |  |  |
Dividends on ordinary shares |  |  |  |  |  | $ 25,000,000 |  |  |
Q2 2023 |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |
Dividend, ordinary shares, in usd per share |  |  |  |  | $ 2.48 |  |  |  |
Dividends on ordinary shares |  |  |  |  | $ 150,000,000 |  |  |  |
Q3 2023 |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |
Dividend, ordinary shares, in usd per share |  |  |  | $ 0.33 |  |  |  |  |
Dividends on ordinary shares |  |  |  | $ 20,000,000 |  |  |  |  |
5.625% Preference Shares, rep by Dep Shares (AHL PRE) |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |
Preference shares, rate | 5.625% |  |  |  |  |  | 5.625% | 5.625% | 5.625%
Depositary share interest |  |  |  | 0.10% |  |  | 0.10% | 0.10% | 0.10%
Depositary share dividend |  |  |  | $ 0.35156 |  |  | $ 0.35156 | $ 0.35156 |
5.625% Preference Shares, rep by Dep Shares (AHL PRE) | Q1 2023 |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |
Dividend, preference shares, in usd per share |  |  |  |  |  | $ 351.56 |  |  |
Dividends on preference shares |  |  |  |  |  | $ 3,515,600 |  |  |
5.625% Preference Shares, rep by Dep Shares (AHL PRE) | Q2 2023 |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |
Dividend, preference shares, in usd per share |  |  |  |  | $ 351.56 |  |  |  |
Dividends on preference shares |  |  |  |  | $ 3,515,600 |  |  |  |
5.625% Preference Shares, rep by Dep Shares (AHL PRE) | Q3 2023 |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |
Dividend, preference shares, in usd per share |  |  |  | $ 351.56 |  |  |  |  |
Dividends on preference shares |  |  |  | $ 3,515,600 |  |  |  |  |
5.950% Preference Shares (AHL PRC) |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |
Preference shares, rate |  |  | 5.95% |  |  |  | 5.95% | 5.95% | 5.95%
5.950% Preference Shares (AHL PRC) | Q1 2023 |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |
Dividend, preference shares, in usd per share |  |  |  |  |  | $ 0.60 |  |  |
Dividends on preference shares |  |  |  |  |  | $ 6,595,000 |  |  |
5.950% Preference Shares (AHL PRC) | Q2 2023 |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |
Dividend, preference shares, in usd per share |  |  |  |  | $ 0.61 |  |  |  |
Dividends on preference shares |  |  |  |  | $ 6,669,300 |  |  |  |
5.950% Preference Shares (AHL PRC) | Q3 2023 |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |
Dividend, preference shares, in usd per share |  |  |  | $ 0.61 |  |  |  |  |
Dividends on preference shares |  |  |  | $ 6,741,900 |  |  |  |  |
5.625% Preference Shares (AHL PRD) |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |
Preference shares, rate |  | 5.625% |  |  |  |  | 5.625% | 5.625% | 5.625%
5.625% Preference Shares (AHL PRD) | Q1 2023 |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |
Dividend, preference shares, in usd per share |  |  |  |  |  | $ 0.35 |  |  |
Dividends on preference shares |  |  |  |  |  | $ 3,516,000 |  |  |
5.625% Preference Shares (AHL PRD) | Q2 2023 |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |
Dividend, preference shares, in usd per share |  |  |  |  | $ 0.35 |  |  |  |
Dividends on preference shares |  |  |  |  | $ 3,516,000 |  |  |  |
5.625% Preference Shares (AHL PRD) | Q3 2023 |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |
Dividend, preference shares, in usd per share |  |  |  | $ 0.35 |  |  |  |  |
Dividends on preference shares |  |  |  | $ 3,516,000 |  |  |  |  |

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