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Dividends - Summary of Declared Dividends (Details) - USD ($) $ / shares in Units, $ in Millions					6 Months Ended
	Jul. 01, 2023	Jun. 15, 2023	Aug. 13, 2019	Sep. 20, 2016	Jun. 30, 2023	Jun. 30, 2022
Dividends Payable [Line Items]
Payments of Ordinary Dividends					$ 20.0
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%
5.950% Preference Shares (AHL PRC)
Dividends Payable [Line Items]
Record Date		Jun. 15, 2023
Preferred Stock, Dividend Rate, Percentage		5.95%			5.95%	5.95%
5.625% 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%
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	Jul. 01, 2023
Depositary share dividend	$ 0.35156
Depositary share interest of 1/1000th in each 5.625%	0.001%
Subsequent Event | 5.950% Preference Shares (AHL PRC)
Dividends Payable [Line Items]
Dividend, in usd per share	$ 0.3719
Payable Date	Jul. 01, 2023
Subsequent Event | 5.625% Preference Shares (AHL PRD)
Dividends Payable [Line Items]
Dividend, in usd per share	$ 0.3516
Payable Date	Jul. 01, 2023

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Preferred Stock, Dividend Rate, Depositary Share Fractional Interest (1/1000th of 5.625% Preference Share)

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- Definition

Date the declared dividend will be paid, in YYYY-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
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The per share amount of a dividend declared, but not paid, as of the financial reporting date.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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Date the holder must own the stock to be entitled to the dividend, in YYYY-MM-DD format.

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Cash outflow in the form of ordinary dividends to common shareholders, preferred shareholders and noncontrolling interests, generally out of earnings.

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The percentage rate used to calculate dividend payments on preferred stock.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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