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Dividends - Summary of Declared Dividends (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  |  |  |  | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 01, 2023 | Jun. 15, 2023 | Apr. 14, 2023 | Apr. 01, 2023 | Mar. 15, 2023 | Aug. 13, 2019 | Sep. 20, 2016 | Jun. 30, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Mar. 01, 2023
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments of Ordinary Dividends |  |  |  |  |  |  |  | $ 20.0 | $ 40.0 |  |
5.625% Preference Shares, rep by Dep Shares (AHL PRE) |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Record Date |  | Jun. 15, 2023 |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  | 5.625% |  |  |  | 5.625% |  | 5.625% | 5.625% | 5.625% |
5.950% Preference Shares (AHL PRC) |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Record Date |  | Jun. 15, 2023 |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  | 5.95% |  |  |  |  |  | 5.95% | 5.95% | 5.95% |
5.625% Preference Shares (AHL PRD) |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Record Date |  | Jun. 15, 2023 |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  | 5.625% |  |  |  |  | 5.625% | 5.625% | 5.625% | 5.625% |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments of Ordinary Dividends |  |  | $ 20.0 |  |  |  |  |  |  |  |
Subsequent Event | 5.625% Preference Shares, rep by Dep Shares (AHL PRE) |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividend, in usd per share | $ 351.56 |  |  |  |  |  |  |  |  |  | $ 351.56
Payable Date | Jul. 01, 2023 |  |  | Apr. 01, 2023 |  |  |  |  |  |  |
Record Date |  |  |  |  | Mar. 15, 2023 |  |  |  |  |  |
Depositary share dividend | $ 0.35156 |  |  |  |  |  |  |  |  |  | 0.35156
Preferred Stock, Dividend Rate, Percentage |  |  |  |  | 5.625% |  |  |  |  |  |
Subsequent Event | 5.950% Preference Shares (AHL PRC) |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividend, in usd per share | $ 0.3719 |  |  |  |  |  |  |  |  |  | 0.3719
Payable Date | Jul. 01, 2023 |  |  | Apr. 01, 2023 |  |  |  |  |  |  |
Record Date |  |  |  |  | Mar. 15, 2023 |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  | 5.95% |  |  |  |  |  |
Subsequent Event | 5.625% Preference Shares (AHL PRD) |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividend, in usd per share | $ 0.3516 |  |  |  |  |  |  |  |  |  | $ 0.3516
Payable Date | Jul. 01, 2023 |  |  | Apr. 01, 2023 |  |  |  |  |  |  |
Record Date |  |  |  |  | Mar. 15, 2023 |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  | 5.625% |  |  |  |  |  |

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