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Dividends - Summary of Declared Dividends (Details) - USD ($) $ / shares in Units, $ in Millions								6 Months Ended	12 Months Ended
	Jul. 01, 2023	Jun. 15, 2023	Apr. 14, 2023	Apr. 01, 2023	Mar. 15, 2023	Aug. 13, 2019	Sep. 20, 2016	Jun. 30, 2023	Dec. 31, 2022	Dec. 31, 2021	Mar. 01, 2023
Dividends Payable [Line Items]
Payments of Ordinary Dividends								$ 20.0	$ 40.0
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%	5.625%
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%	5.95%
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%	5.625%
Subsequent Event
Dividends Payable [Line Items]
Payments of Ordinary Dividends			$ 20.0
Subsequent Event | 5.625% Preference Shares, rep by Dep Shares (AHL PRE)
Dividends Payable [Line Items]
Dividend, in usd per share	$ 351.56										$ 351.56
Payable Date	Jul. 01, 2023			Apr. 01, 2023
Record Date					Mar. 15, 2023
Depositary share dividend	$ 0.35156										0.35156
Preferred Stock, Dividend Rate, Percentage					5.625%
Subsequent Event | 5.950% Preference Shares (AHL PRC)
Dividends Payable [Line Items]
Dividend, in usd per share	$ 0.3719										0.3719
Payable Date	Jul. 01, 2023			Apr. 01, 2023
Record Date					Mar. 15, 2023
Preferred Stock, Dividend Rate, Percentage					5.95%
Subsequent Event | 5.625% Preference Shares (AHL PRD)
Dividends Payable [Line Items]
Dividend, in usd per share	$ 0.3516										$ 0.3516
Payable Date	Jul. 01, 2023			Apr. 01, 2023
Record Date					Mar. 15, 2023
Preferred Stock, Dividend Rate, Percentage					5.625%

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Depositary Share Dividend

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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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- Definition

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
-SubTopic 10
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