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Dividends - Summary of Declared Dividends (Details) - $ / shares |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 28, 2020 | Aug. 13, 2019 | Sep. 20, 2016 | Dec. 31, 2019 | Dec. 31, 2018
5.950% Preference Shares (AHL PRC) |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |
Preference shares, rate |  |  |  | 5.95% | 5.95%
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, rep by Dep Shares (AHL PRE) |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |
Preference shares, rate | 5.625% | 5.625% |  | 5.625% | 0.00%
Depositary share interest of 1/1000th in each 5.625% |  |  |  |  | 0.00%
Subsequent Event | 5.950% Preference Shares (AHL PRC) |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |
Dividend, in usd per share | $ 0.3719 |  |  |  |
Payable Date | Apr. 01, 2020 |  |  |  |
Record Date | Mar. 15, 2020 |  |  |  |
Preference shares, rate | 5.95% |  |  |  |
Subsequent Event | 5.625% Preference Shares (AHL PRD) |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |
Dividend, in usd per share | $ 0.3516 |  |  |  |
Payable Date | Apr. 01, 2020 |  |  |  |
Record Date | Mar. 15, 2020 |  |  |  |
Subsequent Event | 5.625% Preference Shares, rep by Dep Shares (AHL PRE) |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |
Dividend, in usd per share | $ 351.56 |  |  |  |
Payable Date | Apr. 01, 2020 |  |  |  |
Record Date | Mar. 15, 2020 |  |  |  |
Depositary share interest of 1/1000th in each 5.625% | 0.001% |  |  |  |
Depositary share dividend, equivalent to 1/1000th pref share dividend | $ 0.35156 |  |  |  |

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- Definition Preferred Stock, Dividend Rate, Depositary Share Fractional Interest (1/1000th of 5.625% Preference Share) + References No definition available. + Details
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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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- Definition The per share amount of a dividend declared, but not paid, as of the financial reporting date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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- Definition Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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