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Dividends - Summary of Declared Dividends (Details) - USD ($) |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended
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Feb. 28, 2025 | Jan. 01, 2025 | Nov. 29, 2024 | Nov. 26, 2024 | Oct. 01, 2024 | Aug. 30, 2024 | Jul. 01, 2024 | May 30, 2024 | Apr. 01, 2024 | Mar. 01, 2024 | Aug. 13, 2019 | Sep. 20, 2016 | May 02, 2013 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,847,200 | $ 13,773,500 | $ 13,700,900 | $ 13,627,200 | $ 54,948,800 |  |
Ordinary Stock, Dividends Rate, Per Dollar Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.15 |  |
Payments of Ordinary Dividends, Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (195,000,000.0) | $ (40,300,000) | $ (40,000,000.0)
S2024Q1 Dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Date Declared |  |  |  |  |  |  |  |  |  | Mar. 01, 2024 |  |  |  |  |  |  |  |  |  |
Payable Date |  |  |  |  |  |  |  |  | Apr. 01, 2024 |  |  |  |  |  |  |  |  |  |  |
S2024Q2 Dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Date Declared |  |  |  |  |  |  |  | May 30, 2024 |  |  |  |  |  |  |  |  |  |  |  |
Payable Date |  |  |  |  |  |  | Jul. 01, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
S2024Q3 Dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Date Declared |  |  |  |  |  | Aug. 30, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payable Date |  |  |  |  | Oct. 01, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
S2024Q4 Dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Date Declared |  |  | Nov. 29, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
S2024Q4 Dividends | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payable Date |  | Dec. 30, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
5.950% Preference Shares (AHL PRC) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  | 5.95% |  |  |  |  |  |  |  |  |  | 5.95% |  |  |  |  | 5.95% |  |
Dividends |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,815,600 | 6,741,900 | 6,669,300 | 6,595,600 | $ 26,822,400 |  |
Preferred Stock, Dividend Rate, Per-Dollar-Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.44 |  |
5.950% Preference Shares (AHL PRC) | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  | 5.95% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
5.625% Preference Shares (AHL PRD) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  |  |  |  |  |  |  |  | 5.625% |  |  |  |  |  | 5.625% |  |
Dividends |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,516,000 | 3,516,000 | 3,516,000 | 3,516,000 | $ 14,064,000 |  |
Preferred Stock, Dividend Rate, Per-Dollar-Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.41 |  |
5.625% Preference Shares (AHL PRD) | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 5.625% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
5.625% Preference Shares (AHL PRE) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  |  |  |  |  |  |  | 5.625% |  |  |  |  |  |  | 5.625% |  |
Dividends |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,515,600 | $ 3,515,600 | $ 3,515,600 | $ 3,515,600 | $ 14,062,400 |  |
Preferred Stock, Dividend Rate, Per-Dollar-Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,406.24 |  |
Depositary share dividend |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.40624 |  |  |  | $ 1.40624 |  |
Depositary share interest of 1/1000th in each 5.625% |  |  |  |  |  |  |  |  |  |  | 0.001% |  |  |  |  |  |  |  |  |
5.625% Preference Shares (AHL PRE) | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 5.625% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depositary share dividend | $ 0.3516 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depositary share interest of 1/1000th in each 5.625% | 0.001% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
7.00% Preference Shares, rep by Dep Shares (AHL PRF) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  | 7.00% |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.00% |  |
Depositary share interest of 1/1000th in each 5.625% |  |  |  | 0.001% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
7.00% Preference Shares, rep by Dep Shares (AHL PRF) | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 7.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depositary share dividend | $ 0.6125 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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