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v3.24.1

Subsequent Events - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended |
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Apr. 21, 2024 | Apr. 01, 2024 | Mar. 15, 2024 | Dec. 28, 2023 | Aug. 13, 2019 | Sep. 20, 2016 | May 02, 2013 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Mar. 01, 2024
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payable Date |  |  |  | Dec. 28, 2023 |  |  |  |  | Oct. 01, 2023 | Jul. 01, 2023 | Apr. 01, 2023 |  |  |  |
Dividends Payable, Date Declared |  |  |  |  |  |  |  | Nov. 30, 2023 | Sep. 01, 2023 | Jun. 01, 2023 | Mar. 01, 2023 |  |  |  |
Dividends paid on ordinary shares |  |  |  |  |  |  |  |  |  |  |  | $ 40.3 | $ 40.0 | $ 0.0 |
5.950% Preference Shares (AHL PRC) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  |  |  | 5.95% |  |  |  |  | 5.95% | 5.95% |  |
5.625% Preference Shares (AHL PRD) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  |  | 5.625% |  |  |  |  |  | 5.625% | 5.625% |  |
5.625% Preference Shares (AHL PRE) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  | 5.625% |  |  |  |  |  |  | 5.625% | 5.625% |  |
Depositary share dividend |  |  |  |  |  |  |  | $ 0.35156 |  |  |  | $ 0.35156 |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid on ordinary shares | $ 25.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | 5.950% Preference Shares (AHL PRC) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend, in usd per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.3719
Payable Date |  | Apr. 01, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Date Declared |  |  | Mar. 15, 2024 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | 5.625% Preference Shares (AHL PRD) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  | 5.625% |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend, in usd per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.3516
Payable Date |  | Apr. 01, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Date Declared |  |  | Mar. 15, 2024 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | 5.625% Preference Shares (AHL PRE) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  | 5.625% |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend, in usd per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 351.56
Payable Date |  | Apr. 01, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Date Declared |  |  | Mar. 15, 2024 |  |  |  |  |  |  |  |  |  |  |  |
Depositary share dividend |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.35156

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