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v3.25.1

Subsequent Events - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |
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Feb. 28, 2025 | Jan. 01, 2025 | Nov. 29, 2024 | Nov. 26, 2024 | Aug. 13, 2019 | Sep. 20, 2016 | May 02, 2013 | Jan. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Mar. 01, 2025 | Jan. 02, 2025
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of Ordinary Dividends, Common Stock |  |  |  |  |  |  |  |  | $ 195.0 | $ 40.3 | $ 40.0 |  |
Preference shares liquidation preference, value |  |  |  | $ 225.0 | $ 250.0 |  |  |  |  |  |  |  |
Forecast | California Wildfires | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, estimate of possible loss |  |  |  |  |  |  |  |  |  |  |  | $ 50.0 |
Forecast | California Wildfires | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, estimate of possible loss |  |  |  |  |  |  |  |  |  |  |  | $ 75.0 |
5.950% Preference Shares (AHL PRC) |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  | 5.95% |  |  |  | 5.95% |  | 5.95% | 5.95% |  |  |
Redemption price per share |  |  |  |  |  |  | $ 25 |  | $ 25 | $ 25 |  |  |
Preference shares liquidation preference, value |  |  |  |  |  |  | $ 275.0 |  |  |  |  |  |
5.625% Preference Shares (AHL PRD) |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  |  | 5.625% |  |  | 5.625% | 5.625% |  |  |
Redemption price per share |  |  |  |  |  | $ 25 |  |  | $ 25 | $ 25 |  |  |
Preference shares liquidation preference, value |  |  |  |  |  | $ 250.0 |  |  |  |  |  |  |
5.625% Preference Shares (AHL PRE) |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  | 5.625% |  |  |  | 5.625% | 5.625% |  |  |
Depositary share interest of 1/1000th in each 5.625% |  |  |  |  | 0.001% |  |  |  |  |  |  |  |
Depositary share dividend |  |  |  |  |  |  |  |  | $ 1.40624 |  |  |  |
Redemption price per share |  |  |  |  | $ 25 |  |  |  | $ 25,000 | $ 25,000 |  |  |
7.00% Preference Shares, rep by Dep Shares (AHL PRF) |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  | 7.00% |  |  |  |  | 7.00% | 7.00% |  |  |
Depositary share interest of 1/1000th in each 5.625% |  |  |  | 0.001% |  |  |  |  |  |  |  |  |
Redemption price per share |  |  |  | $ 25 |  |  |  |  | $ 25,000 | $ 25,000 |  |  |
Subsequent Event | California Wildfires | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency industry amount incurred |  |  |  |  |  |  |  | $ 35,000.0 |  |  |  |  |
Subsequent Event | California Wildfires | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency industry amount incurred |  |  |  |  |  |  |  | $ 45,000.0 |  |  |  |  |
Subsequent Event | 5.950% Preference Shares (AHL PRC) |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  | 5.95% |  |  |  |  |  |  |  |  |  |  |
Redemption price per share |  |  |  |  |  |  |  |  |  |  |  |  | $ 25
Preference shares liquidation preference, value |  |  |  |  |  |  |  |  |  |  |  |  | $ 275.0
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 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | 5.625% Preference Shares (AHL PRD) | S2025Q1SeriesEDividends |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Payable Date | Apr. 01, 2025 |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Date Declared | Mar. 15, 2025 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |
Depositary share interest of 1/1000th in each 5.625% | 0.001% |  |  |  |  |  |  |  |  |  |  |  |
Depositary share dividend | $ 0.3516 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | 5.625% Preference Shares (AHL PRE) | S2025Q1SeriesFDividends |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Payable Date | Apr. 01, 2025 |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Date Declared | Mar. 15, 2025 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | 7.00% Preference Shares, rep by Dep Shares (AHL PRF) |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 7.00% |  |  |  |  |  |  |  |  |  |  |  |
Dividend, in usd per share | $ 612.50 |  |  |  |  |  |  |  |  |  |  |  |
Depositary share interest of 1/1000th in each 7.00% | 0.001% |  |  |  |  |  |  |  |  |  |  |  |
Depositary share dividend | $ 0.6125 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | 7.00% Preference Shares, rep by Dep Shares (AHL PRF) | S2025Q1SeriesGDividends |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Payable Date | Apr. 01, 2025 |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Date Declared | Mar. 31, 2025 |  |  |  |  |  |  |  |  |  |  |  |

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